/* =====================================================================
   JustFlip — Gilded Scholar
   ===================================================================== */

:root {
  /* Core palette */
  --ink:                #131313;
  --surface:            #131313;
  --surface-low:        #1c1b1b;
  --surface-high:       #2a2a2a;
  --surface-bright:     #393939;
  --surface-lowest:     #0e0d0d;

  --primary:            #ffeed1;
  --primary-container:  #ffcd57;
  --secondary:          #a1ced7;
  --on-surface:         #f5ecd9;
  --on-surface-variant: #d2c5af;
  --outline:            #6e6450;
  --outline-variant:    #4e4635;
  --tint:               #f0c04b;

  /* Mastery colors */
  --m-gray:    #6e6a60;
  --m-orange:  #e0894a;
  --m-gold:    #ffcd57;
  --m-green:   #8fc28a;
  --m-blue:    #a1ced7;
  --m-red:     #d9745e;

  /* Layout */
  --gutter: clamp(1.25rem, 3vw, 2.5rem);
  --maxw: 1240px;
  --radius-sm: 0.125rem;
  --radius-md: 0.6rem;
  --radius-lg: 1.4rem;
  --radius-xl: 2.2rem;
  --ease: cubic-bezier(.16,.84,.32,1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  background: var(--surface);
  color: var(--on-surface);
  font-family: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--primary-container); color: var(--ink); }

/* =====================================================================
   Typography
   ===================================================================== */

.display {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-weight: 600;
  margin: 0 0 1.25rem;
}
.display em {
  font-style: italic;
  font-weight: 500;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 60%, var(--tint) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.display--sm {
  font-size: clamp(2rem, 4.5vw, 3rem);
}

.headline {
  font-size: clamp(1.75rem, 3.5vw, 2.65rem);
  line-height: 1.1;
  letter-spacing: -0.018em;
  font-weight: 600;
  margin: 0 0 1.1rem;
}
.headline em {
  font-style: italic;
  font-weight: 500;
  color: var(--primary-container);
}

.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  margin: 0 0 1.1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-container));
}

.lede {
  font-size: clamp(1.05rem, 1.3vw, 1.18rem);
  color: var(--on-surface-variant);
  max-width: 56ch;
  margin: 0 0 1.75rem;
}

.kicker {
  font-size: 1.025rem;
  color: var(--on-surface-variant);
  max-width: 60ch;
  margin: 0;
}
.kicker em {
  color: var(--on-surface);
  font-style: italic;
}

code {
  font-family: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.93em;
  color: var(--primary-container);
  background: rgba(255,205,87,0.08);
  padding: 0.05em 0.4em;
  border-radius: 4px;
}

/* =====================================================================
   Buttons
   ===================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.85rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.005em;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 0;
  transition: transform 320ms var(--ease), background 320ms var(--ease), box-shadow 320ms var(--ease);
}
.btn--primary {
  color: var(--ink);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-container) 100%);
  box-shadow:
    0 0 0 1px rgba(255,205,87,0.2),
    0 18px 40px -18px rgba(240,192,75,0.55);
}
.btn--primary:hover {
  background: linear-gradient(135deg, var(--primary-container) 0%, var(--primary) 100%);
  box-shadow:
    0 0 0 1px rgba(255,205,87,0.4),
    0 20px 40px -14px rgba(240,192,75,0.65);
}
.btn--ghost {
  color: var(--on-surface);
  background: transparent;
  border: 1px solid rgba(78,70,53,0.45);
  padding: 0.83rem 1.2rem;
}
.btn--ghost:hover {
  background: var(--surface-high);
  border-color: rgba(255,205,87,0.35);
}

/* =====================================================================
   Nav
   ===================================================================== */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 1.2rem;
  padding: 0.9rem var(--gutter);
  background: rgba(19,19,19,0.55);
  backdrop-filter: blur(18px) saturate(120%);
  -webkit-backdrop-filter: blur(18px) saturate(120%);
  transition: background 400ms var(--ease), box-shadow 400ms var(--ease);
}
.nav::after {
  content: "";
  position: absolute;
  left: var(--gutter);
  right: var(--gutter);
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,205,87,0.18), transparent);
  opacity: 0;
  transition: opacity 400ms var(--ease);
}
.nav.is-scrolled {
  background: rgba(14,13,13,0.78);
}
.nav.is-scrolled::after { opacity: 1; }

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  font-size: 1.05rem;
}
.nav__mark {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: rgba(255,205,87,0.08);
}

.nav__links {
  display: flex;
  gap: 1.6rem;
  justify-self: center;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--on-surface-variant);
  text-transform: lowercase;
}
.nav__links a { position: relative; padding: 0.35rem 0; }
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 2px;
  height: 1px;
  background: var(--primary-container);
  transition: right 360ms var(--ease);
}
.nav__links a:hover { color: var(--on-surface); }
.nav__links a:hover::after { right: 0; }
.nav__links a[aria-current="page"] {
  color: var(--on-surface);
}
.nav__links a[aria-current="page"]::after {
  right: 0;
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.nav__cta { padding: 0.6rem 1rem; font-size: 0.88rem; }

/* ---------------------------------------------------
   Language switcher
   ------------------------------------------------- */
.lang-s {
  position: relative;
}
.lang-s__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.35rem 0.55rem;
  background: transparent;
  border: 1px solid rgba(78,70,53,0.3);
  border-radius: var(--radius-sm);
  color: var(--on-surface-variant);
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color 280ms var(--ease), color 280ms var(--ease);
  font-family: inherit;
  line-height: 1;
}
.lang-s__btn:hover {
  border-color: rgba(255,205,87,0.35);
  color: var(--on-surface);
}
.lang-s__flag {
  font-size: 1.1rem;
  line-height: 1;
  display: inline-block;
}
.lang-s__arrow {
  font-size: 0.6rem;
  transition: transform 240ms var(--ease);
  display: inline-block;
}
.lang-s.is-open .lang-s__arrow {
  transform: rotate(180deg);
}
.lang-s__dd {
  position: absolute;
  top: calc(100% + 0.4rem);
  right: 0;
  min-width: 220px;
  background: var(--surface-low);
  border: 1px solid rgba(78,70,53,0.25);
  border-radius: var(--radius-sm);
  padding: 0.3rem;
  display: none;
  z-index: 60;
  box-shadow: 0 20px 60px -20px rgba(0,0,0,0.6);
}
.lang-s.is-open .lang-s__dd {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}
.lang-s__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  width: 100%;
  padding: 0.5rem 0.7rem;
  background: transparent;
  border: 0;
  border-radius: 4px;
  color: var(--on-surface-variant);
  font-size: 0.85rem;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
  transition: background 200ms var(--ease), color 200ms var(--ease);
}
.lang-s__item:hover {
  background: var(--surface-high);
  color: var(--on-surface);
}
.lang-s__item.is-active {
  color: var(--primary-container);
  font-weight: 600;
}

@media (max-width: 980px) {
  .nav__links {
    gap: 1rem;
    font-size: 0.78rem;
  }
}

@media (max-width: 860px) {
  .nav { grid-template-columns: 1fr auto; }
  .nav__links { display: none; }
}

@media (max-width: 480px) {
  .nav {
    gap: 0.7rem;
    padding-inline: 1rem;
  }
  .nav__actions {
    gap: 0.4rem;
  }
  .nav__cta {
    width: 42px;
    height: 42px;
    justify-content: center;
    padding: 0;
  }
  .nav__cta span {
    display: none;
  }
}

/* =====================================================================
   Rail / section indicator
   ===================================================================== */

.rail {
  position: fixed;
  top: 50%;
  right: 1.25rem;
  transform: translateY(-50%);
  z-index: 40;
}
.rail ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}
.rail li {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--outline);
  transition: color 320ms var(--ease);
}
.rail li span {
  width: 28px;
  text-align: left;
  font-variant-numeric: tabular-nums;
}
.rail li em {
  font-style: normal;
  opacity: 0;
  transform: translateX(8px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
  font-weight: 500;
  color: var(--on-surface-variant);
}
.rail li.is-active { color: var(--primary-container); }
.rail li.is-active em { opacity: 1; transform: translateX(0); }

@media (max-width: 1100px) { .rail { display: none; } }

/* =====================================================================
   Sections
   ===================================================================== */

main { display: block; }

.section {
  position: relative;
  padding: clamp(5rem, 9vw, 9rem) var(--gutter);
  max-width: var(--maxw);
  margin: 0 auto;
}

.section__head {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: clamp(1rem, 3vw, 3rem);
  align-items: start;
  margin-bottom: clamp(2.5rem, 5vw, 4.5rem);
  max-width: 1080px;
}
.section__head--right {
  margin-left: auto;
  grid-template-columns: 1fr 96px;
}
.section__head--right .section__number { order: 2; text-align: right; }
.section__head--right > div { order: 1; }

.section__number {
  font-family: "Plus Jakarta Sans";
  font-feature-settings: "tnum";
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--primary-container);
  padding-top: 0.5rem;
  font-weight: 500;
}

/* =====================================================================
   Hero
   ===================================================================== */

.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: clamp(2rem, 4vw, 4rem);
  padding: clamp(6rem, 12vh, 9rem) var(--gutter) clamp(4rem, 8vh, 7rem);
  max-width: var(--maxw);
  margin: 0 auto;
  overflow: hidden;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero__beam {
  position: absolute;
  inset: -10% -10% auto -10%;
  height: 120%;
  background:
    radial-gradient(80% 60% at 20% 25%, rgba(240,192,75,0.18), transparent 60%),
    radial-gradient(60% 50% at 85% 70%, rgba(161,206,215,0.10), transparent 65%);
  filter: blur(20px);
  transform: translate3d(0,0,0);
  animation: drift 22s ease-in-out infinite alternate;
}
@keyframes drift {
  0%   { transform: translate3d(-3%, -2%, 0) rotate(0.4deg); }
  100% { transform: translate3d(4%,  3%, 0) rotate(-0.6deg); }
}
.hero__grain {
  position: absolute;
  inset: 0;
  opacity: 0.35;
  mix-blend-mode: overlay;
  background-image:
    radial-gradient(circle at 10% 30%, rgba(255,205,87,0.04) 0 1px, transparent 2px),
    radial-gradient(circle at 80% 70%, rgba(161,206,215,0.05) 0 1px, transparent 2px),
    radial-gradient(circle at 50% 50%, rgba(255,255,255,0.02) 0 1px, transparent 2px);
  background-size: 360px 360px, 420px 420px, 280px 280px;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 920px;
}

.hero__actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2.25rem;
}

.hero__meta {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.6rem;
  color: var(--on-surface-variant);
  font-size: 0.92rem;
}
.hero__meta li strong { color: var(--on-surface); font-weight: 500; }
.hero__meta li + li::before {
  content: "·";
  margin-right: 1.6rem;
  margin-left: -1.6rem;
  color: var(--outline);
}

.hero__visual {
  position: relative;
  z-index: 1;
}
.hero__visual img {
  display: block;
  max-width: 340px;
  height: auto;
}

.hero__scroll {
  position: absolute;
  left: var(--gutter);
  bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  opacity: 0.7;
}
.hero__scroll span {
  width: 36px;
  height: 1px;
  background: var(--primary-container);
  display: inline-block;
  position: relative;
  overflow: hidden;
}
@media (max-width: 880px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero__visual {
    justify-self: center;
  }
  .hero__visual img {
    max-width: 260px;
  }
  .hero__actions { justify-content: center; }
  .hero__meta { justify-content: center; }
}

.hero__scroll span::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--primary-container), transparent);
  animation: sweep 2.4s ease-in-out infinite;
}
@keyframes sweep {
  0%   { transform: translateX(-100%); }
  60%  { transform: translateX(100%); }
  100% { transform: translateX(100%); }
}

/* =====================================================================
   Floating pill (hero "AI" hint)
   ===================================================================== */

.float-pill {
  position: absolute;
  top: clamp(5.5rem, 11vh, 7rem);
  right: clamp(1rem, 4vw, 4rem);
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.9rem 0.55rem 0.75rem;
  background: rgba(28, 27, 27, 0.72);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  border-radius: 999px;
  font-size: 0.82rem;
  letter-spacing: 0.01em;
  color: var(--on-surface);
  box-shadow:
    inset 0 0 0 1px rgba(255, 205, 87, 0.22),
    0 18px 40px -22px rgba(240, 192, 75, 0.45);
  animation: float-bob 6.5s ease-in-out infinite;
  transition: transform 320ms var(--ease), box-shadow 320ms var(--ease);
}
.float-pill::before {
  content: "";
  position: absolute;
  inset: -2px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 237, 209, 0.25), rgba(161, 206, 215, 0.18));
  filter: blur(18px);
  z-index: -1;
  opacity: 0.7;
}
.float-pill:hover {
  transform: translateY(-2px);
  box-shadow:
    inset 0 0 0 1px rgba(255, 205, 87, 0.45),
    0 22px 48px -20px rgba(240, 192, 75, 0.55);
}
.float-pill__spark {
  display: inline-grid;
  place-items: center;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  color: var(--ink);
  font-size: 0.78rem;
  font-weight: 700;
  box-shadow: 0 0 14px rgba(255, 205, 87, 0.55);
  animation: spark-pulse 2.4s ease-in-out infinite;
}
.float-pill__text em {
  font-style: normal;
  color: var(--primary-container);
  font-weight: 600;
  margin-right: 0.25rem;
}
.float-pill__arrow {
  color: var(--on-surface-variant);
  transition: transform 320ms var(--ease), color 320ms var(--ease);
}
.float-pill:hover .float-pill__arrow {
  transform: translateX(4px);
  color: var(--primary-container);
}

@keyframes float-bob {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-6px); }
}
@keyframes spark-pulse {
  0%, 100% { transform: scale(1);    box-shadow: 0 0 14px rgba(255,205,87,0.55); }
  50%      { transform: scale(1.08); box-shadow: 0 0 22px rgba(255,205,87,0.85); }
}

@media (max-width: 760px) {
  .float-pill {
    position: relative;
    top: auto;
    right: auto;
    margin: 0 0 1.5rem;
    font-size: 0.78rem;
  }
}

/* =====================================================================
   AI section
   ===================================================================== */

.section--ai {
  position: relative;
}
.section--ai::before {
  content: "";
  position: absolute;
  inset: 10% -10% auto -10%;
  height: 80%;
  background:
    radial-gradient(45% 60% at 20% 30%, rgba(255, 205, 87, 0.10), transparent 65%),
    radial-gradient(40% 50% at 85% 70%, rgba(161, 206, 215, 0.08), transparent 65%);
  filter: blur(10px);
  pointer-events: none;
  z-index: -1;
}

.ai {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}

/* ── Floating quotes ── */

.ai__quotes {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ai__quote {
  position: absolute;
  display: flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.9rem 1.2rem;
  background: transparent;
  max-width: 80%;
  font-style: italic;
  line-height: 1.4;
}

.ai__quote-text {
  font-size: 0.95rem;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, Times, serif;
  font-style: italic;
  opacity: 0.65;
}

.ai__quote--1 {
  top: 5%;
  right: 5%;
  transform: rotate(2deg);
}
.ai__quote--1 .ai__quote-text {
  color: var(--on-surface);
}

.ai__quote--2 {
  top: 50%;
  left: 3%;
  transform: translateY(-50%) rotate(-3deg);
}
.ai__quote--2 .ai__quote-text {
  color: var(--primary-container);
}

.ai__quote--3 {
  bottom: 5%;
  right: 8%;
  transform: rotate(1deg);
}
.ai__quote--3 .ai__quote-text {
  color: var(--secondary);
}

.ai__quote-text {
  font-size: 2rem;
  color: var(--on-surface);
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, Times, serif;
  font-style: italic;
  opacity: 0.65;
}

.ai__quote--1 {
  top: 5%;
  right: 5%;
  transform: rotate(2deg);
}

.ai__quote--2 {
  top: 50%;
  left: 3%;
  transform: translateY(-50%) rotate(-3deg);
}

.ai__quote--3 {
  bottom: 5%;
  right: 8%;
  transform: rotate(1deg);
}

.ai__panel {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: clamp(1.5rem, 2.5vw, 2rem);
  background: var(--surface-low);
  border-radius: var(--radius-md);
}
.ai__panel-title {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary-container);
  font-weight: 600;
}

.ai__agents {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}
.ai__agents li {
  display: grid;
  grid-template-columns: 14px 1fr;
  column-gap: 0.85rem;
  align-items: baseline;
}
.ai__agents strong {
  font-size: 1rem;
  font-weight: 600;
}
.ai__agents em {
  display: block;
  grid-column: 2;
  margin-top: 0.2rem;
  color: var(--on-surface-variant);
  font-style: normal;
  font-size: 0.92rem;
}
.ai__dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c, var(--primary-container));
  box-shadow: 0 0 10px var(--c, var(--primary-container));
  align-self: center;
  margin-top: 0.45rem;
}

.ai__flow {
  list-style: none;
  padding: 1.25rem 0 0;
  margin: 0;
  display: grid;
  gap: 0.75rem;
  counter-reset: ai-step;
  border-top: 1px dashed rgba(78, 70, 53, 0.35);
}
.ai__flow li {
  display: grid;
  grid-template-columns: 1.6rem 1fr;
  align-items: baseline;
  column-gap: 0.6rem;
}
.ai__flow li::before {
  counter-increment: ai-step;
  content: counter(ai-step, decimal-leading-zero);
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--primary-container);
  font-weight: 600;
}
.ai__flow strong { font-weight: 600; }
.ai__flow em {
  display: block;
  grid-column: 2;
  color: var(--on-surface-variant);
  font-style: normal;
  font-size: 0.92rem;
  margin-top: 0.1rem;
}

.ai__note {
  margin-top: clamp(2rem, 4vw, 3rem);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--on-surface-variant);
}
.ai__note-mark {
  color: var(--primary-container);
  text-shadow: 0 0 12px rgba(255, 205, 87, 0.6);
}

@media (max-width: 920px) {
  .ai { grid-template-columns: 1fr; }
}

/* ── AI option cards (two approaches inside panel) ── */

.ai__options {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.ai__option {
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid rgba(78, 70, 53, 0.2);
}

.ai__option-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}

.ai__option-badge {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--c, var(--primary-container));
}

.ai__option-head h4 {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
}

.ai__option p {
  margin: 0 0 0.85rem;
  font-size: 0.88rem;
  color: var(--on-surface-variant);
  line-height: 1.5;
}

.ai__option-code {
  padding: 0.6rem 0.85rem;
  background: var(--surface-lowest);
  border-radius: var(--radius-sm);
  font-family: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.82rem;
  color: var(--primary-container);
  white-space: nowrap;
  overflow-x: auto;
}

.ai__option-tools {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: var(--on-surface-variant);
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.ai__option-tools span {
  margin-right: 0.15rem;
}

.ai__option-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.3rem;
  margin-right: 0.45rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--primary-container);
  color: #000;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: opacity 0.2s;
}

.ai__option-link:hover {
  opacity: 0.85;
}
.ai__option-link--ghost {
  background: transparent;
  color: var(--on-surface);
  border: 1px solid rgba(78,70,53,0.45);
}

/* =====================================================================
   AI prompt page
   ===================================================================== */

.prompt-page {
  overflow: hidden;
}

.prompt-hero {
  position: relative;
  min-height: min(760px, calc(100svh - 72px));
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.65fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  padding: clamp(5rem, 10vh, 8rem) var(--gutter) clamp(4rem, 8vh, 7rem);
  max-width: var(--maxw);
  margin: 0 auto;
}

.prompt-hero__copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.prompt-hero__panel {
  position: relative;
  z-index: 1;
  min-width: 0;
  padding: clamp(1.4rem, 2.6vw, 2rem);
  background:
    radial-gradient(90% 70% at 0% 0%, rgba(161,206,215,0.10), transparent 70%),
    var(--surface-low);
  border: 1px solid rgba(78,70,53,0.28);
  border-radius: var(--radius-md);
  box-shadow: 0 28px 70px -42px rgba(240,192,75,0.35);
}

.prompt-hero__panel::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,237,209,0.16), rgba(161,206,215,0.10), transparent 56%);
  pointer-events: none;
  z-index: -1;
}

.prompt-hero__panel-kicker,
.prompt-editor__label {
  display: block;
  margin-bottom: 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--primary-container);
  font-weight: 700;
}

.prompt-hero__panel p {
  margin: 0;
  color: var(--on-surface-variant);
  font-size: 0.98rem;
}

.section--prompt {
  padding-top: clamp(3rem, 7vw, 6rem);
}

.prompt-editor {
  min-width: 0;
  background:
    radial-gradient(80% 70% at 100% 0%, rgba(161,206,215,0.07), transparent 70%),
    var(--surface-lowest);
  border: 1px solid rgba(78,70,53,0.35);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow:
    0 28px 70px -42px rgba(0,0,0,0.75),
    0 18px 54px -46px rgba(240,192,75,0.45);
}

.prompt-editor__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: clamp(1rem, 2vw, 1.3rem) clamp(1rem, 2vw, 1.5rem);
  border-bottom: 1px solid rgba(78,70,53,0.35);
  background: rgba(28,27,27,0.72);
}

.prompt-editor__label {
  margin-bottom: 0.15rem;
}

.prompt-editor__meta {
  display: block;
  color: var(--on-surface-variant);
  font-size: 0.82rem;
}

.prompt-editor__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.6rem;
}

.prompt-editor__btn {
  min-height: 40px;
  padding: 0.62rem 0.9rem;
  white-space: nowrap;
}

.prompt-editor__textarea {
  display: block;
  width: 100%;
  min-height: clamp(520px, 68vh, 760px);
  resize: vertical;
  padding: clamp(1rem, 2.2vw, 1.6rem);
  border: 0;
  outline: 0;
  background:
    linear-gradient(180deg, rgba(19,19,19,0.94), rgba(14,13,13,0.98)),
    var(--surface-lowest);
  color: var(--on-surface);
  caret-color: var(--primary-container);
  font-family: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
  font-size: clamp(0.82rem, 1.1vw, 0.94rem);
  line-height: 1.7;
  tab-size: 2;
}

.prompt-editor__textarea:focus {
  box-shadow: inset 0 0 0 1px rgba(255,205,87,0.36);
}

/* The user's own request — editorial, not code. */
.prompt-editor__request {
  display: block;
  width: 100%;
  min-height: clamp(150px, 22vh, 230px);
  resize: vertical;
  padding: clamp(1rem, 2.2vw, 1.5rem);
  border: 0;
  outline: 0;
  background: var(--surface-lowest);
  color: var(--on-surface);
  caret-color: var(--primary-container);
  font-family: inherit;
  font-size: clamp(1rem, 1.3vw, 1.08rem);
  line-height: 1.6;
}

.prompt-editor__request::placeholder {
  color: var(--on-surface-variant);
  opacity: 0.7;
}

.prompt-editor__request:focus {
  box-shadow: inset 0 0 0 1px rgba(255,205,87,0.36);
}

/* Collapsible build-instructions panel. */
.prompt-tech {
  border-top: 1px solid rgba(78,70,53,0.35);
  background: rgba(28,27,27,0.45);
}

.prompt-tech__summary {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.95rem clamp(1rem, 2vw, 1.5rem);
  cursor: pointer;
  list-style: none;
  color: var(--on-surface);
  font-size: 0.9rem;
  font-weight: 600;
  transition: background 200ms var(--ease), color 200ms var(--ease);
}

.prompt-tech__summary::-webkit-details-marker { display: none; }

.prompt-tech__summary:hover {
  background: rgba(255,205,87,0.05);
  color: var(--primary-container);
}

.prompt-tech__chevron {
  flex: none;
  color: var(--primary-container);
  transition: transform 220ms var(--ease);
}

.prompt-tech[open] .prompt-tech__chevron {
  transform: rotate(90deg);
}

.prompt-tech__hint {
  margin-left: auto;
  color: var(--on-surface-variant);
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.01em;
}

.prompt-tech .prompt-editor__textarea {
  min-height: clamp(360px, 52vh, 620px);
  border-top: 1px solid rgba(78,70,53,0.35);
}

.prompt-editor__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 58px;
  padding: 0.85rem clamp(1rem, 2vw, 1.5rem);
  border-top: 1px solid rgba(78,70,53,0.35);
  color: var(--on-surface-variant);
  font-size: 0.86rem;
}

.prompt-editor__footer p {
  margin: 0;
}

/* =====================================================================
   Legal page
   ===================================================================== */

.legal-page {
  position: relative;
  overflow: hidden;
}

.legal-page::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(42% 34% at 18% 10%, rgba(255, 205, 87, 0.08), transparent 70%),
    radial-gradient(36% 30% at 88% 24%, rgba(161, 206, 215, 0.08), transparent 72%);
  pointer-events: none;
}

.legal-hero {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(6rem, 11vh, 8rem) var(--gutter) clamp(2.2rem, 5vw, 3.5rem);
}

.legal-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.legal-meta {
  display: inline-flex;
  align-items: baseline;
  gap: 0.65rem;
  padding: 0.8rem 1rem;
  border: 1px solid rgba(255, 205, 87, 0.18);
  background: rgba(28, 27, 27, 0.55);
  border-radius: var(--radius-md);
  color: var(--on-surface);
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.7);
}

.legal-meta__label {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.section--legal {
  padding-top: 1rem;
}

.legal-shell {
  position: relative;
}

.legal-card {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(1.5rem, 2vw, 2rem);
  border: 1px solid rgba(78, 70, 53, 0.4);
  border-radius: var(--radius-xl);
  background:
    linear-gradient(180deg, rgba(42, 42, 42, 0.78) 0%, rgba(28, 27, 27, 0.94) 100%);
  box-shadow:
    inset 0 1px 0 rgba(255, 237, 209, 0.04),
    0 28px 80px -40px rgba(0, 0, 0, 0.82);
}

.legal-card__intro {
  padding-bottom: 1.5rem;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid rgba(78, 70, 53, 0.45);
  color: var(--on-surface);
}

.legal-card__intro p:last-child {
  margin-bottom: 0;
}

.legal-prose {
  display: grid;
  gap: 1.4rem;
}

.legal-block {
  padding: 1.1rem 1.2rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(19, 19, 19, 0.48) 0%, rgba(19, 19, 19, 0.18) 100%);
  border: 1px solid rgba(78, 70, 53, 0.32);
}

.legal-block h2 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.02rem, 1.4vw, 1.2rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.legal-block p {
  margin: 0 0 0.9rem;
  color: var(--on-surface-variant);
}

.legal-block p:last-child {
  margin-bottom: 0;
}

.legal-block strong {
  color: var(--on-surface);
}

.legal-link {
  color: var(--primary-container);
  text-decoration: underline;
  text-decoration-color: rgba(255, 205, 87, 0.4);
  text-underline-offset: 0.16em;
}

.legal-link:hover {
  text-decoration-color: rgba(255, 205, 87, 0.9);
}

.prompt-editor__status {
  color: var(--primary-container);
  font-weight: 600;
  min-width: 12ch;
}

.section--prompt-help {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: 0;
}

.prompt-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.prompt-steps article,
.prompt-platforms a {
  background: var(--surface-low);
  border: 1px solid rgba(78,70,53,0.22);
  border-radius: var(--radius-md);
}

.prompt-steps article {
  padding: 1.25rem;
}

.prompt-steps span {
  display: block;
  margin-bottom: 1rem;
  color: var(--primary-container);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  font-weight: 700;
}

.prompt-steps h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}

.prompt-steps p {
  margin: 0;
  color: var(--on-surface-variant);
  font-size: 0.92rem;
}

.prompt-platforms {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.prompt-platforms a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  transition: transform 320ms var(--ease), background 320ms var(--ease), border-color 320ms var(--ease);
}

.prompt-platforms a:hover {
  transform: translateY(-2px);
  background: var(--surface-high);
  border-color: rgba(255,205,87,0.35);
}

.prompt-platforms span {
  color: var(--c, var(--primary-container));
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
}

.prompt-platforms strong {
  font-size: 0.92rem;
  font-weight: 600;
  text-align: right;
}

@media (max-width: 980px) {
  .prompt-hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }
}

@media (max-width: 760px) {
  .prompt-hero {
    text-align: center;
  }
  .prompt-page .display {
    font-size: 2.2rem;
    line-height: 1.08;
    overflow-wrap: break-word;
  }
  .prompt-page .headline {
    font-size: 1.65rem;
    line-height: 1.18;
    overflow-wrap: break-word;
  }
  .prompt-page .lede,
  .prompt-page .kicker {
    max-width: 100%;
  }
  .prompt-page .section__head {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }
  .prompt-hero .hero__actions {
    justify-content: center;
  }
  .prompt-editor__toolbar,
  .prompt-editor__footer {
    align-items: stretch;
    flex-direction: column;
  }
  .prompt-editor__actions {
    justify-content: stretch;
  }
  .prompt-editor__btn {
    flex: 1 1 auto;
  }
  .prompt-steps,
  .prompt-platforms {
    grid-template-columns: 1fr;
  }
  .prompt-platforms strong {
    text-align: left;
  }
  .prompt-tech__hint {
    display: none;
  }
}

/* =====================================================================
   Placeholder system
   ===================================================================== */

.placeholder {
  position: relative;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(80% 50% at 30% 20%, rgba(255,205,87,0.08), transparent 70%),
    var(--surface-low);
  overflow: hidden;
  isolation: isolate;
}
.placeholder::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(45deg, rgba(255,237,209,0.025) 0 1px, transparent 1px 14px);
  z-index: 0;
}
.placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow:
    inset 0 0 0 1px rgba(78,70,53,0.15),
    0 30px 60px -30px rgba(240,192,75,0.18);
  pointer-events: none;
}

.placeholder__chrome {
  position: relative;
  z-index: 1;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  text-align: center;
}
.placeholder__label {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.placeholder__label::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary-container);
  box-shadow: 0 0 0 4px rgba(255,205,87,0.18);
}
.placeholder__label--inv { color: #5a4f3a; }
.placeholder__label--inv::before { background: #b08b2c; box-shadow: 0 0 0 4px rgba(176,139,44,0.18); }

.placeholder__icons {
  display: flex;
  align-items: end;
  gap: 1.6rem;
  height: 220px;
  width: min(620px, 90%);
}
.placeholder__icons span {
  background: linear-gradient(180deg, var(--surface-high), var(--surface-low));
  border-radius: 18px;
  box-shadow: inset 0 0 0 1px rgba(78,70,53,0.25);
  position: relative;
}
.placeholder__icons span::after {
  content: "";
  position: absolute;
  inset: 12% 14%;
  border-radius: 12px;
  background:
    radial-gradient(60% 40% at 30% 20%, rgba(255,205,87,0.10), transparent 70%),
    rgba(57,57,57,0.7);
}
.ph-iphone { width: 70px; height: 140px; align-self: end; }
.ph-ipad   { width: 130px; height: 180px; align-self: end; }
.ph-mac    { width: 240px; height: 160px; align-self: end; border-radius: 10px 10px 4px 4px; }

/* Phone-shaped placeholder */
.placeholder--phone {
  aspect-ratio: 9 / 19;
  width: 100%;
  max-width: 320px;
  border-radius: 38px;
  background:
    radial-gradient(60% 40% at 30% 15%, rgba(255,205,87,0.10), transparent 70%),
    linear-gradient(180deg, #1f1e1e, #161515);
}
.placeholder--phone::after {
  box-shadow:
    inset 0 0 0 2px rgba(78,70,53,0.35),
    inset 0 0 0 9px var(--surface),
    0 40px 80px -30px rgba(0,0,0,0.6),
    0 30px 60px -30px rgba(240,192,75,0.18);
}
.placeholder--tilt { transform: rotate(4deg); }

/* =====================================================================
   Devices section
   ===================================================================== */

.devices {
  display: flex;
  justify-content: center;
}
.devices__stage {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
}
.devices__list {
  display: none;
}

.tile {
  position: relative;
  padding: 1.5rem 1.6rem;
  background: var(--surface-low);
  border-radius: var(--radius-md);
  transition: background 360ms var(--ease);
}
.tile:hover { background: var(--surface-bright); }
.tile__num {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary-container);
  margin-bottom: 0.6rem;
}
.tile h3 {
  margin: 0 0 0.4rem;
  font-size: 1.18rem;
  font-weight: 600;
}
.tile p {
  margin: 0;
  color: var(--on-surface-variant);
  font-size: 0.96rem;
}

@media (max-width: 880px) {
}

/* =====================================================================
   Study / duo
   ===================================================================== */

.duo {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  justify-items: center;
  padding: 2rem 0;
}
.duo__chips {
  position: absolute;
  inset: auto 0 -1.5rem 0;
  display: flex;
  gap: 0.6rem;
  justify-content: center;
  pointer-events: none;
}
.chip {
  background: var(--surface-high);
  color: var(--on-surface);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
  position: relative;
  isolation: isolate;
}
.chip::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 999px;
  z-index: -1;
  opacity: 0.35;
  filter: blur(10px);
}
.chip--again { color: #f3b9ad; }
.chip--again::before { background: var(--m-red); }
.chip--hard  { color: #f7cda3; }
.chip--hard::before  { background: var(--m-orange); }
.chip--good  { color: #c8e7c2; }
.chip--good::before  { background: var(--m-green); }
.chip--easy  { color: var(--secondary); }
.chip--easy::before  { background: var(--secondary); }

@media (max-width: 760px) {
  .duo { grid-template-columns: 1fr; }
  .duo__chips { position: static; padding-top: 1rem; }
}

/* Phone screenshot frame (study duo + others) */
.phone-frame {
  position: relative;
  width: 100%;
  max-width: 320px;
  border-radius: 38px;
  overflow: hidden;
  line-height: 0;
  background: var(--surface-low);
}
.phone-frame__shot {
  display: block;
  width: 100%;
  height: auto;
}
.phone-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(78,70,53,0.2);
  box-shadow:
    0 40px 80px -30px rgba(0,0,0,0.6),
    0 30px 60px -30px rgba(240,192,75,0.18);
  pointer-events: none;
  z-index: 2;
}
.phone-frame--tilt { transform: rotate(4deg); }

/* =====================================================================
   Algorithm
   ===================================================================== */

.algo {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
}
.algo__stats {
  aspect-ratio: 4 / 3;
}
.algo__visual {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  border-radius: var(--radius-lg);
  --algo-urgency-color: #8c8a7a;
  --algo-urgency-glow: rgba(140, 138, 122, 0.38);
  background:
    radial-gradient(70% 58% at 50% 24%, rgba(255, 255, 255, 0.72), transparent 66%),
    radial-gradient(42% 42% at 50% 56%, rgba(224, 137, 74, 0.20), transparent 72%),
    radial-gradient(65% 70% at 50% 40%, rgba(255, 205, 87, 0.18), transparent 72%),
    linear-gradient(180deg, #fbf5e7 0%, #f5ebdb 54%, #efe0c7 100%);
  box-shadow:
    inset 0 0 0 1px rgba(190, 153, 101, 0.20),
    0 28px 64px -34px rgba(120, 84, 33, 0.35);
}
.algo__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 44%, rgba(255, 255, 255, 0.55), transparent 34%),
    radial-gradient(circle at 50% 48%, rgba(227, 173, 88, 0.08), transparent 58%),
    repeating-linear-gradient(45deg, rgba(255, 247, 232, 0.16) 0 1px, transparent 1px 14px);
  opacity: 0.8;
  mix-blend-mode: soft-light;
  pointer-events: none;
}
.algo__visual::after {
  box-shadow:
    inset 0 0 0 1px rgba(184, 138, 64, 0.16),
    0 26px 54px -28px rgba(214, 155, 59, 0.22);
}
.algo__dashboard {
  position: relative;
  z-index: 1;
  min-height: 100%;
  display: grid;
  grid-template-columns: minmax(96px, 1fr) minmax(170px, 1.2fr) minmax(96px, 1fr);
  align-items: center;
  gap: clamp(1rem, 2.6vw, 2rem);
  padding: clamp(1.4rem, 3.2vw, 2.25rem);
}
.algo__metric {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.algo__metric--progress {
  align-items: flex-start;
  justify-self: start;
}
.algo__metric--urgency {
  align-items: flex-start;
  justify-self: end;
}
.algo__metric-value {
  font-size: clamp(2.1rem, 4.4vw, 3.4rem);
  line-height: 0.95;
  letter-spacing: -0.055em;
  font-weight: 700;
  color: #2f2317;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.28);
}
.algo__metric-label {
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: #be8732;
}
.algo__metric-label--warm {
  color: var(--algo-urgency-color);
}
.algo__ring {
  position: relative;
  justify-self: center;
  width: min(100%, 214px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
}
.algo__ring-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  transform: rotate(-90deg);
}
.algo__ring-track,
.algo__ring-progress {
  fill: none;
  stroke-width: 16;
}
.algo__ring-track {
  stroke: rgba(255, 255, 255, 0.54);
}
.algo__ring-progress {
  stroke: url(#algo-ring-gradient);
  stroke-linecap: round;
  filter: drop-shadow(0 8px 16px rgba(200, 130, 42, 0.18));
}
.algo__orb {
  width: clamp(58px, 11vw, 66px);
  height: clamp(58px, 11vw, 66px);
  border-radius: 50%;
  background: radial-gradient(circle at 36% 32%, rgba(255, 223, 191, 0.98), var(--algo-urgency-color) 42%, rgba(189, 96, 42, 0.98) 100%);
  box-shadow:
    0 0 0 10px rgba(255, 255, 255, 0.16),
    0 0 0 28px rgba(224, 137, 74, 0.07),
    0 0 22px var(--algo-urgency-glow);
  animation: algo-orb-breathe 4.8s ease-in-out infinite;
}
.algo__urgency {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 0.85rem;
  background: rgba(255, 255, 255, 0.46);
  border-radius: 999px;
  box-shadow:
    inset 0 0 0 1px rgba(201, 153, 91, 0.22),
    0 18px 30px -24px rgba(156, 97, 28, 0.4);
  backdrop-filter: blur(8px) saturate(115%);
  -webkit-backdrop-filter: blur(8px) saturate(115%);
}
.algo__urgency-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(180, 158, 127, 0.28);
  box-shadow: 0 0 0 0 rgba(224, 137, 74, 0);
  transform: scale(0.94);
  transition:
    transform 360ms var(--ease),
    background-color 360ms var(--ease),
    box-shadow 360ms var(--ease),
    opacity 360ms var(--ease);
}
.algo__urgency-dot.is-active {
  background: var(--algo-urgency-color);
  transform: scale(1.18);
  box-shadow: 0 0 12px var(--algo-urgency-glow);
}
@keyframes algo-orb-breathe {
  0%, 100% {
    transform: scale(0.98);
  }
  50% {
    transform: scale(1.04);
  }
}
.algo__flow {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1rem;
}
.algo__flow li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 1rem;
  padding: 0.9rem 1.1rem;
  background: var(--surface-low);
  border-radius: var(--radius-md);
  align-items: center;
}
.algo__flow strong {
  display: block;
  font-weight: 600;
}
.algo__flow em {
  display: block;
  grid-column: 2;
  color: var(--on-surface-variant);
  font-style: normal;
  font-size: 0.92rem;
  margin-top: 0.1rem;
}

.orb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #fff 0%, var(--m-gray) 60%);
  box-shadow: 0 0 0 4px rgba(110,106,96,0.18);
  align-self: start;
  margin-top: 0.25rem;
}
.orb--unseen     { background: radial-gradient(circle at 30% 30%, #fff 0%, var(--m-gray) 60%); box-shadow: 0 0 12px 2px rgba(110,106,96,0.4); }
.orb--learning   { background: radial-gradient(circle at 30% 30%, #ffe4c8 0%, var(--m-orange) 60%); box-shadow: 0 0 14px 2px rgba(224,137,74,0.45); }
.orb--reviewing  { background: radial-gradient(circle at 30% 30%, #fff3b8 0%, var(--m-gold) 60%); box-shadow: 0 0 16px 3px rgba(255,205,87,0.55); }
.orb--relearning { background: radial-gradient(circle at 30% 30%, #f7c9bd 0%, var(--m-red) 65%); box-shadow: 0 0 14px 2px rgba(217,116,94,0.45); }
.orb--graduated  { background: radial-gradient(circle at 30% 30%, #d5f0d2 0%, var(--m-green) 60%); box-shadow: 0 0 16px 3px rgba(143,194,138,0.5); }

.algo__formula {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding: 2rem;
  background: var(--surface-lowest);
  border-radius: var(--radius-md);
  text-align: center;
}
.formula {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  font-family: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  color: var(--on-surface);
}
.formula__op { color: var(--outline); }
.formula__ef {
  background: linear-gradient(135deg, var(--primary), var(--primary-container));
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.formula__note {
  margin: 1rem auto 0;
  max-width: 60ch;
  color: var(--on-surface-variant);
  font-size: 0.95rem;
}

@media (max-width: 880px) {
  .algo { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .algo__dashboard {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }
  .algo__metric--progress,
  .algo__metric--urgency {
    align-items: center;
    justify-self: center;
  }
  .algo__metric--progress {
    order: 1;
  }
  .algo__ring {
    order: 0;
    width: min(100%, 190px);
  }
  .algo__metric--urgency {
    order: 2;
  }
}

/* =====================================================================
   Markdown
   ===================================================================== */

.markdown {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  justify-items: center;
}
.markdown__shot { width: 100%; max-width: 320px; }

.markdown__sample {
  width: 100%;
  background: var(--surface-lowest);
  color: var(--on-surface);
  padding: clamp(1.25rem, 2.5vw, 2.25rem);
  border-radius: var(--radius-md);
  font-family: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.92rem;
  line-height: 1.7;
  margin: 0;
  white-space: pre-wrap;
  overflow: hidden;
}
.md-h      { color: var(--primary-container); font-weight: 700; }
.md-strong { color: var(--primary); font-weight: 700; }
.md-em     { color: var(--secondary); font-style: italic; }
.md-code   { color: var(--on-surface-variant); }
.md-math   { color: var(--secondary); }

@media (max-width: 880px) {
  .markdown { grid-template-columns: 1fr; }
}

/* =====================================================================
   Audio / Widget
   ===================================================================== */

.audio {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  justify-items: center;
}
.audio__cards {
  position: relative;
  width: 100%;
  max-width: 442px;
  aspect-ratio: 9 / 10;
}

.audio__card {
  position: absolute;
  width: 78%;
  border-radius: 14px;
  box-shadow:
    0 8px 28px -12px rgba(0,0,0,0.2),
    inset 0 0 0 1px rgba(78,70,53,0.08);
  line-height: 0;
  background: var(--surface);
}

.audio__card-shot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
}

.audio__card--front {
  top: 3%;
  left: 0;
  z-index: 2;
}

.audio__card--back {
  bottom: 3%;
  right: 0;
  z-index: 1;
}

/* ── Speech bubbles ── */

.audio__bubble {
  position: absolute;
  padding: 0.6rem 1rem;
  border-radius: 13px;
  background: var(--surface-bright);
  color: var(--on-surface);
  box-shadow:
    0 4px 14px rgba(0,0,0,0.18),
    inset 0 0 0 1px rgba(78,70,53,0.08);
  line-height: 1.2;
}

.audio__bubble::after {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
}

.audio__bubble-text {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.audio__bubble-text--de {
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, Times, serif;
  font-style: italic;
  font-weight: 500;
  letter-spacing: 0.04em;
}

.audio__bubble--en {
  top: 0.8rem;
  right: 0.8rem;
}

.audio__bubble--en::after {
  bottom: -9px;
  left: 22%;
  border-width: 9px 7px 0 7px;
  border-color: var(--surface-bright) transparent transparent transparent;
}

.audio__bubble--de {
  bottom: 0.8rem;
  left: 0.8rem;
}

.audio__bubble--de::after {
  top: -9px;
  right: 22%;
  border-width: 0 7px 9px 7px;
  border-color: transparent transparent var(--surface-bright) transparent;
}

.widget {
  width: 100%;
  max-width: 360px;
  padding: 1.4rem 1.5rem;
  background:
    radial-gradient(120% 80% at 0% 0%, rgba(255,205,87,0.10), transparent 60%),
    var(--surface-high);
  border-radius: 28px;
  box-shadow:
    inset 0 0 0 1px rgba(78,70,53,0.25),
    0 30px 60px -30px rgba(240,192,75,0.2);
}
.widget__head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.widget__title {
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary-container);
  font-weight: 600;
}
.widget__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--m-green);
  box-shadow: 0 0 0 4px rgba(143,194,138,0.18);
}
.widget__deck {
  margin: 0;
  color: var(--on-surface-variant);
  font-size: 0.82rem;
}
.widget__card {
  margin: 0.2rem 0 1rem;
  font-size: 1.18rem;
  font-weight: 600;
}
.widget__progress {
  height: 6px;
  background: var(--surface);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.8rem;
}
.widget__progress span {
  display: block;
  height: 100%;
  width: var(--p, 60%);
  background: linear-gradient(90deg, var(--primary), var(--primary-container));
  box-shadow: 0 0 12px 0 rgba(255,205,87,0.5);
}
.widget__footer {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--on-surface-variant);
}

@media (max-width: 880px) {
  .audio { grid-template-columns: 1fr; }
}

/* =====================================================================
   Split / Theme
   ===================================================================== */

.split {
  position: relative;
  height: clamp(360px, 60vh, 560px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.split__half {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.split__half--dark {
  background:
    radial-gradient(60% 50% at 30% 20%, rgba(255,205,87,0.12), transparent 70%),
    linear-gradient(180deg, #1c1b1b, #0e0d0d);
}
.split__half--light {
  background:
    radial-gradient(60% 50% at 70% 20%, rgba(176,139,44,0.18), transparent 70%),
    linear-gradient(180deg, #f5ecd9, #e7dcc4);
}
.split__seam {
  position: absolute;
  top: 0; bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(255,205,87,0.4), transparent);
  transform: translateX(-50%);
}
.split__shot {
  display: block;
  max-width: 100%;
  max-height: 100%;
  height: auto;
  border-radius: 36px;
  box-shadow:
    0 0 0 2px rgba(78,70,53,0.15),
    0 0 0 7px var(--surface-lowest),
    0 20px 40px -16px rgba(0,0,0,0.5);
}
.split__half--dark .split__shot {
  box-shadow:
    0 0 0 2px rgba(255,255,255,0.08),
    0 0 0 7px rgba(0,0,0,0.3),
    0 20px 40px -16px rgba(0,0,0,0.6);
}
.split__half--light .split__shot {
  box-shadow:
    0 0 0 2px rgba(78,70,53,0.15),
    0 0 0 7px #e7dcc4,
    0 20px 40px -16px rgba(0,0,0,0.25);
}

/* =====================================================================
   CTA
   ===================================================================== */

.section--cta {
  text-align: center;
  padding-block: clamp(6rem, 12vw, 10rem);
}
.cta {
  max-width: 760px;
  margin: 0 auto;
  position: relative;
}
.cta .hero__actions { justify-content: center; }
.cta__langs {
  text-align: center;
  margin: 2rem 0 0;
  font-size: 0.9rem;
  color: var(--on-surface-variant);
}
.cta::before {
  content: "";
  position: absolute;
  inset: -60% -20% auto -20%;
  height: 100%;
  background: radial-gradient(50% 60% at 50% 50%, rgba(240,192,75,0.18), transparent 60%);
  z-index: -1;
  filter: blur(10px);
}

/* =====================================================================
   Footer
   ===================================================================== */

.footer {
  margin-top: 4rem;
  padding: clamp(3rem, 6vw, 5rem) var(--gutter) 2.5rem;
  background: var(--surface-lowest);
}
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  gap: 1.6rem;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}
.footer__brand strong { font-size: 1.05rem; }
.footer__tag {
  color: var(--on-surface-variant);
  font-size: 0.92rem;
  margin-left: 0.4rem;
}
.footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.6rem;
  font-size: 0.88rem;
  color: var(--on-surface-variant);
}
.footer__nav a { transition: color 280ms var(--ease); }
.footer__nav a:hover { color: var(--primary-container); }
.footer__copy {
  font-size: 0.78rem;
  color: var(--outline);
  margin: 0;
  max-width: 80ch;
}

/* =====================================================================
   Science / Why it works
   ===================================================================== */

.science {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: center;
}

.science__chart {
  position: relative;
  margin: 0;
  padding: clamp(1.4rem, 3vw, 2rem) clamp(1.2rem, 3vw, 2rem) clamp(2.4rem, 4vw, 3rem);
  background: var(--surface-low);
  border-radius: var(--radius-lg);
  box-shadow: inset 0 0 0 1px var(--outline-variant);
}
.science__svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.science__axis {
  stroke: var(--outline-variant);
  stroke-width: 1.5;
}
.science__line {
  fill: none;
  stroke-width: 3.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}
.science__line--cram {
  stroke: var(--outline);
  opacity: 0.78;
}
.science__line--spaced {
  filter: drop-shadow(0 6px 14px rgba(240, 192, 75, 0.18));
}
.science__dot {
  fill: var(--primary-container);
  stroke: var(--surface-low);
  stroke-width: 3;
  opacity: 0;
}
.science__chart.is-visible .science__line {
  transition: stroke-dashoffset 1.7s var(--ease);
  stroke-dashoffset: 0;
}
.science__chart.is-visible .science__line--cram {
  transition-duration: 1.3s;
}
.science__chart.is-visible .science__dot {
  transition: opacity 0.5s var(--ease) 1.3s;
  opacity: 1;
}

.science__legend {
  position: absolute;
  top: clamp(1rem, 2.6vw, 1.5rem);
  right: clamp(1.2rem, 3vw, 1.9rem);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.4rem;
  font-size: 0.78rem;
}
.science__legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.science__legend-item::after {
  content: "";
  width: 16px;
  height: 3px;
  border-radius: 2px;
  background: currentColor;
}
.science__legend-item--spaced { color: var(--primary-container); }
.science__legend-item--cram { color: var(--on-surface-variant); }

.science__axis-label {
  position: absolute;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--outline);
  pointer-events: none;
}
.science__axis-label--y {
  top: clamp(1.1rem, 3vw, 1.7rem);
  left: clamp(1.4rem, 3.4vw, 2rem);
}
.science__axis-label--x {
  bottom: clamp(1.1rem, 2.6vw, 1.5rem);
  right: clamp(1.4rem, 3.4vw, 2rem);
}
.science__chart-note {
  margin: 0.9rem 0 0;
  text-align: center;
  font-size: 0.9rem;
  font-style: italic;
  color: var(--on-surface-variant);
}

.science__principles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(0.8rem, 1.5vw, 1rem);
}

.science__quote {
  margin: clamp(2.6rem, 5vw, 4rem) auto 0;
  max-width: 760px;
  text-align: center;
  position: relative;
}
.science__quote::before {
  content: "\201C";
  display: block;
  font-size: 3.4rem;
  line-height: 0.7;
  color: var(--primary-container);
  margin-bottom: 0.4rem;
}
.science__quote p {
  margin: 0;
  font-size: clamp(1.35rem, 2.6vw, 1.95rem);
  line-height: 1.32;
  font-style: italic;
  color: var(--on-surface);
}
.science__quote cite {
  display: block;
  margin-top: 1.1rem;
  font-style: normal;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--primary-container);
}

/* =====================================================================
   Accessibility / For everyone
   ===================================================================== */

.access {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(0.8rem, 1.5vw, 1.1rem);
}
.access__tile {
  display: flex;
  flex-direction: column;
}
.access__tile--wide {
  grid-column: 1 / -1;
}
.access__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 13px;
  background: var(--surface-high);
  color: var(--primary-container);
  margin-bottom: 0.95rem;
}
.access__langs {
  margin: 0.85rem 0 0 !important;
  font-size: 0.88rem;
  letter-spacing: 0.01em;
  color: var(--on-surface) !important;
}

@media (max-width: 880px) {
  .science {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 640px) {
  .science__principles,
  .access {
    grid-template-columns: 1fr;
  }
  .science__legend {
    position: static;
    flex-direction: row;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.8rem;
  }
}

/* =====================================================================
   Scroll reveal
   ===================================================================== */

[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 800ms var(--ease),
    transform 800ms var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .hero__beam, .hero__scroll span::after, .algo__orb { animation: none; }
  .science__line { stroke-dashoffset: 0 !important; transition: none !important; }
  .science__dot { opacity: 1 !important; transition: none !important; }
  html { scroll-behavior: auto; }
}