/* Luminous Logic — matches stitch_24_puzzle_challenge/luminous_logic/DESIGN.md + client/src/index.css */
:root {
  --primary: #0058bc;
  --primary-container: #0070eb;
  --on-primary: #ffffff;
  --on-primary-container: #fefcff;
  --secondary: #006e28;
  --secondary-container: #6ffb85;
  --on-secondary-container: #00732a;
  --tertiary: #bc000a;
  --tertiary-container: #e2241f;
  --amber: #f59e0b;
  --background: #faf9fe;
  --surface-lowest: #ffffff;
  --surface-low: #f4f3f8;
  --surface-container: #eeedf3;
  --surface-high: #e9e7ed;
  --on-surface: #1a1b1f;
  --on-surface-variant: #414755;
  --outline: #717786;
  --outline-variant: #c1c6d7;
  --max: 1200px;
  --page-pad: clamp(1.25rem, 4vw, 2rem);
  --font-body: "Inter", system-ui, sans-serif;
  --font-display: "Outfit", "SF Pro Display", system-ui, sans-serif;
  --radius-tile: 24px;
  --radius-card: 28px;
  --radius-modal: 40px;
  --shadow-ambient: 0 20px 40px rgba(0, 88, 188, 0.08);
  --shadow-card: 0 8px 32px rgba(26, 27, 31, 0.06);
  --glass-fill: rgba(255, 255, 255, 0.72);
  --glass-stroke: rgba(255, 255, 255, 0.45);
  --hero-gradient: linear-gradient(180deg, #faf9fe 0%, #f3f6fc 45%, #faf9fe 100%);
  --grid-dot: rgba(0, 88, 188, 0.07);
  --canvas-orb-a: rgba(0, 112, 235, 0.14);
  --canvas-orb-b: rgba(0, 110, 40, 0.1);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --background: #12141a;
  --surface-lowest: #1e2028;
  --surface-low: #252830;
  --surface-container: #2c303a;
  --surface-high: #353945;
  --on-surface: #f1f0f5;
  --on-surface-variant: #b8bcc8;
  --outline: #8b919f;
  --outline-variant: #454b58;
  --shadow-ambient: 0 20px 40px rgba(0, 0, 0, 0.35);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.28);
  --glass-fill: rgba(30, 32, 40, 0.82);
  --glass-stroke: rgba(255, 255, 255, 0.08);
  --hero-gradient: linear-gradient(180deg, #12141a 0%, #161b28 45%, #12141a 100%);
  --grid-dot: rgba(173, 198, 255, 0.06);
  --canvas-orb-a: rgba(0, 112, 235, 0.22);
  --canvas-orb-b: rgba(0, 110, 40, 0.12);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  color: var(--on-surface);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--primary-container); }

.font-display { font-family: var(--font-display); }
.font-number { font-family: var(--font-display); font-weight: 700; letter-spacing: -0.03em; }

.label-caps {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.material-symbols-outlined {
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  vertical-align: middle;
  user-select: none;
}

.container {
  width: min(100% - var(--page-pad) * 2, var(--max));
  margin-inline: auto;
}

/* ─── Canvas background (splash) ─── */
.canvas {
  position: relative;
  overflow: hidden;
  background: var(--hero-gradient);
}

.canvas-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, var(--grid-dot) 1px, transparent 0);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, black 15%, transparent 72%);
  pointer-events: none;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}
.orb-a {
  width: min(520px, 70vw);
  height: min(520px, 70vw);
  top: -15%;
  right: -10%;
  background: var(--canvas-orb-a);
  animation: drift-a 9s ease-in-out infinite;
}
.orb-b {
  width: min(420px, 55vw);
  height: min(420px, 55vw);
  bottom: 5%;
  left: -12%;
  background: var(--canvas-orb-b);
  animation: drift-b 11s ease-in-out infinite;
}
.orb-c {
  width: 280px;
  height: 280px;
  top: 40%;
  left: 35%;
  background: rgba(173, 198, 255, 0.35);
  animation: drift-c 13s ease-in-out infinite;
}

@keyframes drift-a {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-28px, 20px) scale(1.06); }
}
@keyframes drift-b {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(24px, -16px) scale(1.05); }
}
@keyframes drift-c {
  0%, 100% { opacity: 0.5; transform: translate(0, 0); }
  50% { opacity: 0.85; transform: translate(16px, -24px); }
}

.float-deco {
  position: absolute;
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--primary);
  opacity: 0.12;
  pointer-events: none;
  animation: float-y 5s ease-in-out infinite;
}
.float-deco.op { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 700; }
.float-deco.n { font-size: clamp(2rem, 4vw, 3rem); }

@keyframes float-y {
  0%, 100% { transform: translateY(0); opacity: 0.1; }
  50% { transform: translateY(-12px); opacity: 0.18; }
}

/* ─── Glass ─── */
.glass {
  background: var(--glass-fill);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-stroke);
}

.glass-card {
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow-card);
}

html[data-theme="dark"] .glass-card,
html[data-theme="dark"] .about-card.glass-card,
html[data-theme="dark"] .feature-glass,
html[data-theme="dark"] .shots-fallback {
  background: var(--surface-lowest);
  border: 1px solid var(--outline-variant);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

html[data-theme="dark"] .about-card h3 {
  color: var(--on-surface);
}

html[data-theme="dark"] .about-card p,
html[data-theme="dark"] .rules-list li,
html[data-theme="dark"] .rules-list li span {
  color: var(--on-surface-variant);
}

html[data-theme="dark"] .rules-list li strong {
  color: var(--on-surface);
}

html[data-theme="dark"] .example-eq {
  background: var(--surface-container);
  color: var(--on-surface);
  border: 1px solid var(--outline-variant);
}

html[data-theme="dark"] .stat-cell {
  background: var(--surface-lowest);
}

html[data-theme="dark"] .mode-mini {
  background: var(--surface-container);
  border-color: var(--outline-variant);
}

html[data-theme="dark"] .mode-mini h4 {
  color: var(--on-surface);
}

html[data-theme="dark"] .bento-tile {
  background: var(--surface-container);
  border-color: var(--outline-variant);
  color: var(--on-surface);
}

/* ─── Header ─── */
.site-header a {
  text-decoration: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  padding: 0.75rem var(--page-pad);
  transition: box-shadow 0.25s ease, background 0.25s ease;
}

.site-header.scrolled {
  background: color-mix(in srgb, var(--background) 90%, transparent);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--outline-variant);
}

.header-bar {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
}

.site-header.scrolled .header-bar {
  background: var(--glass-fill);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-stroke);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--on-surface);
  font-weight: 700;
  font-size: 1.05rem;
}

.logo img {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  box-shadow: 0 4px 16px rgba(0, 88, 188, 0.25);
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-desktop a {
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.nav-desktop a:hover { color: var(--primary); }

.nav-cta {
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  background: var(--primary);
  color: var(--on-primary) !important;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 6px 20px rgba(0, 88, 188, 0.28);
}

.nav-cta:hover {
  background: var(--primary-container);
  color: var(--on-primary) !important;
  text-decoration: none;
}

.nav-desktop .nav-legal {
  margin-left: 0.25rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--outline-variant);
}

.theme-toggle {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 14px;
  background: var(--surface-low);
  color: var(--on-surface-variant);
  cursor: pointer;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--primary);
  background: var(--surface-container);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 14px;
  background: var(--surface-low);
  cursor: pointer;
  color: var(--on-surface);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem;
  margin-top: 0.5rem;
  border-radius: 20px;
  box-sizing: border-box;
}

.nav-open .nav-mobile {
  display: flex;
}

.nav-mobile a {
  display: block;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  text-decoration: none;
  color: var(--on-surface);
  font-weight: 500;
  white-space: normal;
}

.nav-mobile a.nav-mobile-cta {
  margin-top: 0.35rem;
  text-align: center;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  text-decoration: none;
}

.nav-mobile a.nav-mobile-cta:hover {
  color: var(--on-primary);
  background: var(--primary-container);
  text-decoration: none;
}

.nav-legal {
  display: inline-flex;
  align-items: center;
  gap: 1.25rem;
}

@media (max-width: 860px) {
  .nav-desktop { display: none; }
  .nav-toggle { display: grid; place-items: center; }
  .site-header .header-bar {
    flex-wrap: wrap;
    align-items: center;
    border-radius: 20px;
  }
  .header-bar .logo {
    flex: 1 1 auto;
    min-width: 0;
  }
  .header-actions {
    flex: 0 0 auto;
  }
  .header-bar .nav-mobile {
    flex: 1 1 100%;
    width: 100%;
    max-width: 100%;
    margin-top: 0.35rem;
  }
  .header-actions .theme-toggle { order: -1; }
}

.platform-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-top: 0.85rem;
}

.platform-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.platform-badge.ios {
  background: var(--primary);
  color: var(--on-primary);
}

.platform-badge.soon {
  background: var(--surface-container);
  color: var(--on-surface-variant);
  border: 1px dashed var(--outline-variant);
}

/* About 24 */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}

@media (max-width: 800px) {
  .about-grid { grid-template-columns: 1fr; }
}

.about-card {
  padding: 1.5rem;
  border-radius: var(--radius-card);
  height: 100%;
}

.about-card h3 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.about-card p {
  margin: 0 0 0.75rem;
  color: var(--on-surface-variant);
  font-size: 0.98rem;
  line-height: 1.65;
}

.about-card p:last-child { margin-bottom: 0; }

.about-card.about-prose p {
  margin-left: 0;
  padding-left: 0;
}

.rules-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.rules-list li {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
  color: var(--on-surface-variant);
  font-size: 0.95rem;
}

.rules-list .step-badge {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 0.8rem;
  font-weight: 700;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.example-eq {
  margin-top: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: 16px;
  background: var(--surface-container);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary);
  text-align: center;
}

/* Screenshots */
.shots-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 900px) {
  .shots-grid { grid-template-columns: 1fr; max-width: 320px; margin: 0 auto; }
}

.shot-frame {
  border-radius: 36px;
  padding: 8px;
  background: linear-gradient(160deg, #3a3f4a, #12141a);
  box-shadow: var(--shadow-card);
}

.shot-screen {
  border-radius: 30px;
  overflow: hidden;
  aspect-ratio: 9 / 19.5;
  background: var(--surface-low);
  position: relative;
}

.shot-screen img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  display: block;
}

.shot-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.5rem;
  text-align: center;
  color: var(--outline);
  font-size: 0.85rem;
}

.shot-screen.has-image .shot-placeholder { display: none; }

.shots-fallback {
  max-width: 28rem;
  margin: 0 auto;
  padding: 1.75rem 1.5rem;
  text-align: center;
  border-radius: var(--radius-card);
}

.shots-fallback p {
  margin: 0.75rem 0 0;
  color: var(--on-surface-variant);
  font-size: 1rem;
  line-height: 1.6;
}

.shots-grid.is-hidden {
  display: none;
}

.download-split {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 0.5rem;
}

.btn-soon {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.9rem 1.5rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.7);
  border: 1px dashed rgba(255, 255, 255, 0.35);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: default;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.2s ease;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 8px 28px rgba(0, 88, 188, 0.32);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
}

.btn-primary:hover {
  color: var(--on-primary);
  background: var(--primary-container);
}

.btn-glass {
  background: var(--glass-fill);
  backdrop-filter: blur(12px);
  color: var(--on-surface);
  border: 1px solid var(--outline-variant);
}

.btn-glass:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ─── Hero ─── */
.hero {
  position: relative;
  padding: 6rem 0 2.5rem;
  min-height: auto;
  display: flex;
  align-items: center;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  align-items: center;
}

@media (max-width: 960px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero-copy .label-caps {
  color: var(--primary);
  margin-bottom: 0.5rem;
  display: block;
}

.hero-tagline {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  margin: 0 0 0.35rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 0.85rem;
}

.hero h1 .accent {
  background: linear-gradient(90deg, var(--primary-container), #53e16f);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--on-surface-variant);
  max-width: 28rem;
  margin: 0 0 1.25rem;
  line-height: 1.6;
}

@media (max-width: 960px) {
  .hero-lead { margin-inline: auto; }
  .hero-actions { justify-content: center; }
  .platform-row {
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
  }
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* Splash logo card */
.splash-logo-wrap {
  display: flex;
  justify-content: center;
  animation: logo-in 0.9s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

.splash-logo-card {
  position: relative;
  width: min(200px, 42vw);
  aspect-ratio: 1;
  border-radius: 44px;
  background: linear-gradient(145deg, #0070eb, #0058bc);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-ambient), 0 32px 64px rgba(0, 88, 188, 0.22);
  animation: logo-float 4s ease-in-out 0.9s infinite;
}

.splash-logo-glow {
  position: absolute;
  inset: -30%;
  background: radial-gradient(circle, rgba(0, 112, 235, 0.4) 0%, transparent 68%);
  border-radius: 50%;
  animation: glow-pulse 3s ease-in-out infinite;
  z-index: -1;
}

.splash-logo-shine {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  overflow: hidden;
  pointer-events: none;
}

.splash-logo-shine::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 35%, rgba(255,255,255,0.22) 50%, transparent 65%);
  animation: shine 3.5s ease-in-out 0.6s infinite;
}

.splash-logo-card .num {
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 12vw, 6.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1;
  letter-spacing: -0.04em;
}

@keyframes logo-in {
  from { opacity: 0; transform: scale(0.75) translateY(28px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
@keyframes logo-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
@keyframes glow-pulse {
  0%, 100% { opacity: 0.55; transform: scale(1.05); }
  50% { opacity: 0.9; transform: scale(1.12); }
}
@keyframes shine {
  0% { transform: translateX(-120%) skewX(-12deg); }
  40%, 100% { transform: translateX(180%) skewX(-12deg); }
}

/* Hero — app icon only (screenshots gallery is below) */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem 0;
}

.hero-app-icon {
  width: min(280px, 58vw);
  height: auto;
  border-radius: 22%;
  box-shadow: var(--shadow-ambient), 0 28px 56px rgba(0, 88, 188, 0.22);
  animation: logo-float 4s ease-in-out infinite;
}

@media (max-width: 960px) {
  .hero { padding-bottom: 2rem; }
  .hero-visual { margin-top: 0.35rem; }
  .hero-app-icon { width: min(220px, 64vw); }
}

.device {
  width: min(260px, 38vw);
  flex-shrink: 0;
  border-radius: 44px;
  padding: 10px;
  background: linear-gradient(160deg, #3a3f4a, #12141a);
  box-shadow: 0 40px 80px rgba(26, 27, 31, 0.22), 0 0 0 1px rgba(255,255,255,0.08) inset;
}

.device.back {
  transform: rotateY(8deg) rotateZ(-3deg) translateY(24px) scale(0.92);
  opacity: 0.92;
  z-index: 1;
}

.device.front {
  transform: rotateY(-6deg) rotateZ(2deg);
  z-index: 2;
}

@media (max-width: 600px) {
  .device.back { display: none; }
  .device { width: min(280px, 88vw); }
}

.device-screen {
  border-radius: 36px;
  background: var(--background);
  overflow: hidden;
  min-height: 440px;
  display: flex;
  flex-direction: column;
}

.device-screen-modes {
  justify-content: space-between;
}

/* In-device: gameplay */
.screen-game {
  padding: 1rem 1.1rem 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.screen-top {
  text-align: center;
  margin-bottom: 0.75rem;
}

.screen-top .label-caps {
  color: var(--primary);
  font-size: 9px;
  letter-spacing: 0.2em;
}

.screen-top h3 {
  margin: 0.2rem 0 0;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
}

.bento {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
  flex: 1;
  align-content: center;
  padding: 0.25rem 0;
}

.bento-tile {
  aspect-ratio: 1;
  border-radius: var(--radius-modal);
  background: var(--surface-lowest);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow-ambient);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 2.75rem);
  font-weight: 700;
  color: var(--on-surface);
}

.ops-row {
  display: flex;
  justify-content: space-between;
  gap: 0.35rem;
  margin: 0.75rem 0;
}

.op-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  display: grid;
  place-items: center;
  font-size: 0;
}

.op-btn.add { background: rgba(0, 112, 235, 0.12); color: var(--primary); }
.op-btn.sub { background: rgba(111, 251, 133, 0.35); color: var(--on-secondary-container); }
.op-btn.mul { background: rgba(226, 36, 31, 0.1); color: var(--tertiary); }

.screen-check {
  width: 100%;
  padding: 0.65rem;
  border: none;
  border-radius: 999px;
  background: var(--primary);
  color: var(--on-primary);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* In-device: modes */
.screen-modes {
  padding: 1rem 1rem 0.5rem;
  gap: 0.65rem;
  display: flex;
  flex-direction: column;
  flex: 1;
  justify-content: center;
}

.device-footer-stat {
  margin: 0 1rem 1rem;
  padding: 0.85rem 1rem;
  border-radius: 20px;
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.device-footer-stat .stat-label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

.device-footer-stat .stat-val {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1;
}

.device-footer-stat .stat-caption {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--on-surface-variant);
  text-align: right;
}

.mode-mini {
  padding: 1rem;
  border-radius: var(--radius-card);
  background: var(--surface-lowest);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow-card);
  text-align: left;
}

.mode-mini-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}

.mode-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.mode-icon.classic {
  background: var(--primary-container);
  color: var(--on-primary-container);
}

.mode-icon.speed {
  background: var(--amber);
  color: #fff;
}

.mode-mini h4 {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
}

.mode-mini-compact {
  padding: 0.75rem 1rem;
}

.progress-track {
  height: 8px;
  background: var(--surface-container);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 65%;
  background: var(--secondary);
  border-radius: inherit;
  box-shadow: 0 0 12px rgba(0, 110, 40, 0.35);
}

.mode-meta {
  margin: 0.4rem 0 0;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

/* ─── Sections ─── */
section.block {
  padding: clamp(2.25rem, 4vw, 3rem) 0;
  position: relative;
}

.block-muted {
  background: var(--surface-low);
}

.section-head {
  text-align: center;
  max-width: 40rem;
  margin: 0 auto clamp(1.25rem, 3vw, 1.75rem);
}

.section-head .label-caps {
  color: var(--primary);
  margin-bottom: 0.4rem;
  display: block;
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.5vw, 2.15rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

.section-head p {
  margin: 0;
  color: var(--on-surface-variant);
  font-size: 1.05rem;
}

/* Mode cards (app-sized) */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  max-width: 880px;
  margin: 0 auto;
}

@media (max-width: 700px) {
  .modes-grid { grid-template-columns: 1fr; }
}

.mode-card-lg {
  padding: 1.35rem;
  border-radius: var(--radius-card);
  background: var(--surface-lowest);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow-card);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.mode-card-lg:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 88, 188, 0.1);
}

.mode-card-lg .mode-icon {
  width: 68px;
  height: 68px;
  margin-bottom: 0.85rem;
}

.mode-card-lg h3 {
  margin: 0 0 0.5rem;
  font-size: 1.35rem;
  font-weight: 600;
}

.mode-card-lg p {
  margin: 0 0 1rem;
  color: var(--on-surface-variant);
  font-size: 0.95rem;
}

.pill {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pill.blue { background: rgba(0, 112, 235, 0.12); color: var(--primary); }
.pill.green { background: rgba(111, 251, 133, 0.35); color: var(--on-secondary-container); }
.pill.amber { background: rgba(245, 158, 11, 0.15); color: #b45309; }

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

@media (max-width: 900px) {
  .features-grid { grid-template-columns: 1fr; }
}

.feature-glass {
  padding: 1.35rem;
  border-radius: var(--radius-card);
  transition: transform 0.2s ease;
}

.feature-glass:hover { transform: translateY(-3px); }

.feature-glass .icon-wrap {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  margin-bottom: 0.85rem;
}

.icon-wrap.blue { background: rgba(0, 112, 235, 0.12); color: var(--primary); }
.icon-wrap.green { background: rgba(111, 251, 133, 0.4); color: var(--on-secondary-container); }
.icon-wrap.coral { background: rgba(226, 36, 31, 0.1); color: var(--tertiary); }

html[data-theme="dark"] .icon-wrap.blue {
  background: rgba(0, 112, 235, 0.28);
  color: #9ec5ff;
}

html[data-theme="dark"] .icon-wrap.green {
  background: rgba(0, 110, 40, 0.45);
  color: #8ef0a0;
}

html[data-theme="dark"] .icon-wrap.coral {
  background: rgba(226, 36, 31, 0.28);
  color: #ff9a96;
}

.btn-apple-icon {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
  display: block;
}

.feature-glass h3 {
  margin: 0 0 0.5rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.feature-glass p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

/* Ranks strip */
.ranks-strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

.rank-chip {
  padding: 0.5rem 1rem;
  border-radius: 999px;
  background: var(--surface-lowest);
  border: 1px solid var(--outline-variant);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--on-surface-variant);
}

.rank-chip span { color: var(--primary); }

/* Stats band */
.stats-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--outline-variant);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

@media (max-width: 700px) {
  .stats-band { grid-template-columns: repeat(2, 1fr); }
}

.stat-cell {
  background: var(--surface-lowest);
  padding: 1.25rem 1rem;
  text-align: center;
}

.stat-cell .val {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.1;
}

.stat-cell .lbl {
  margin-top: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--on-surface-variant);
}

/* CTA */
.cta-panel {
  text-align: center;
  padding: clamp(2rem, 4vw, 2.75rem) 1.75rem;
  border-radius: 32px;
  background: linear-gradient(135deg, #0058bc 0%, #003d82 55%, #004493 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.cta-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 20%, rgba(111, 251, 133, 0.25), transparent 50%);
  pointer-events: none;
}

.cta-panel > * { position: relative; z-index: 1; }

.cta-panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 800;
  margin: 0 0 0.75rem;
}

.cta-panel p {
  margin: 0 auto 1.25rem;
  max-width: 36ch;
  opacity: 0.92;
  font-size: 1.05rem;
}

.cta-panel .btn-primary {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.cta-panel .btn-primary:hover {
  background: var(--primary-fixed, #d8e2ff);
  color: var(--primary);
}

.cta-note {
  margin-top: 0.85rem;
  font-size: 0.85rem;
  opacity: 0.75;
}

/* Footer */
.site-footer {
  padding: 2rem 0 1.5rem;
  border-top: 1px solid var(--outline-variant);
  margin-top: 0.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
}

.footer-tagline {
  color: var(--on-surface-variant);
  font-size: 0.95rem;
  margin: 0.75rem 0 0;
  max-width: 28ch;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  justify-content: flex-end;
}

@media (max-width: 640px) {
  .footer-links { justify-content: flex-start; }
}

.footer-links a {
  color: var(--on-surface-variant);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.footer-copy {
  grid-column: 1 / -1;
  padding-top: 1rem;
  margin: 0;
  font-size: 0.85rem;
  color: var(--outline);
  border-top: 1px solid var(--outline-variant);
}

/* Legal */
.legal-page {
  padding: 6.5rem 0 4rem;
}

.legal-page h1 {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
  margin: 0 0 0.35rem;
}

.legal-meta {
  color: var(--outline);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.legal-page h2 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 0.65rem;
}

.legal-page p, .legal-page li {
  color: var(--on-surface-variant);
  max-width: 68ch;
}

.legal-page ul { padding-left: 1.25rem; }

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}