/* ═══════════════════════════════════════════════════════════
   SLAM WEBSITE — style.css
   Sunset Glow · Dark · Energetic · Linear/Vercel-inspired
   ═══════════════════════════════════════════════════════════ */

/* ─── TOKENS ─────────────────────────────────────────────── */
:root {
  --bg:          #0F0A0D;
  --bg-elev:     #1A1115;
  --surface:     #1F1519;
  --surface-hi:  #2A1A20;
  --line:        rgba(255,180,150,0.10);
  --line-strong: rgba(255,180,150,0.18);
  --text:        #FFF4EC;
  --text-dim:    rgba(255,244,236,0.58);
  --text-mute:   rgba(255,244,236,0.32);
  --primary:     #FF7A3B;
  --primary-deep:#E85D1A;
  --primary-soft:rgba(255,122,59,0.16);
  --primary-on:  #23100A;
  --success:     #5DD6A5;
  --warn:        #FFC15C;
  --danger:      #FF6B8A;
  --algebra:     #FFB35C;
  --analysis:    #7CC4FF;
  --geometrie:   #C88CFF;
  --stochastik:  #7FE3C4;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, monospace;

  --ease-spring:  cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --ease-emph:    cubic-bezier(0.2, 0, 0, 1);
  --ease-quick:   cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out:     cubic-bezier(0.32, 0.72, 0, 1);

  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 24px;
  --r-xl: 32px;
  --r-pill: 9999px;

  --max-w: 1140px;
  --gutter: clamp(20px, 5vw, 80px);
}

/* ─── RESET ──────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img, svg { display: block; }

/* ─── KEYFRAMES ──────────────────────────────────────────── */
@keyframes scanLine {
  0%   { top: -2px; opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}
@keyframes blobMorph1 {
  0%,100% { border-radius: 58% 42% 48% 52% / 55% 48% 52% 45%; transform: translate(0,0) rotate(0deg) scale(1); }
  33%      { border-radius: 42% 58% 62% 38% / 45% 55% 45% 55%; transform: translate(40px,-30px) rotate(8deg) scale(1.05); }
  66%      { border-radius: 52% 48% 38% 62% / 48% 58% 42% 52%; transform: translate(-30px,40px) rotate(-5deg) scale(0.97); }
}
@keyframes blobMorph2 {
  0%,100% { border-radius: 44% 56% 52% 48% / 60% 42% 58% 40%; transform: translate(0,0) scale(1); }
  50%      { border-radius: 60% 40% 44% 56% / 42% 60% 40% 58%; transform: translate(-50px,20px) scale(1.08); }
}
@keyframes blobMorph3 {
  0%,100% { border-radius: 50% 50% 40% 60% / 40% 60% 50% 50%; transform: translate(0,0) rotate(0deg); }
  40%      { border-radius: 65% 35% 55% 45% / 55% 45% 65% 35%; transform: translate(30px,-20px) rotate(12deg); }
  80%      { border-radius: 35% 65% 45% 55% / 60% 40% 40% 60%; transform: translate(-20px,30px) rotate(-8deg); }
}
@keyframes float {
  0%,100% { transform: translateY(0px); }
  50%      { transform: translateY(-10px); }
}
@keyframes floatCard1 {
  0%,100% { transform: translateY(0px) rotate(-2deg); }
  50%      { transform: translateY(-14px) rotate(-2deg); }
}
@keyframes floatCard2 {
  0%,100% { transform: translateY(0px) rotate(2deg); }
  50%      { transform: translateY(-10px) rotate(2deg); }
}
@keyframes floatCard3 {
  0%,100% { transform: translateY(0px) rotate(-1deg); }
  50%      { transform: translateY(-12px) rotate(-1deg); }
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.6; transform: scale(0.9); }
}
@keyframes shimmer {
  from { background-position: -200% 0; }
  to   { background-position:  200% 0; }
}
@keyframes revealUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes revealScale {
  from { opacity: 0; transform: scale(0.94); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes xpPop {
  0%   { opacity: 0; transform: translateY(0) scale(0.6); }
  30%  { opacity: 1; transform: translateY(-20px) scale(1.2); }
  70%  { opacity: 1; transform: translateY(-40px) scale(1); }
  100% { opacity: 0; transform: translateY(-60px) scale(0.8); }
}
@keyframes typewriter {
  from { width: 0; }
  to   { width: 100%; }
}
@keyframes gradientShift {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes navReveal {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes ringFill {
  from { stroke-dashoffset: 239; }
  to   { stroke-dashoffset: 60; }
}
@keyframes stepLineGrow {
  from { height: 0; }
  to   { height: 100%; }
}
@keyframes scanLine {
  0%   { transform: translateY(-100%); }
  100% { transform: translateY(200%); }
}

/* ─── AMBIENT BACKGROUND ─────────────────────────────────── */
.ambient-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.blob {
  position: absolute;
  filter: blur(80px);
  opacity: 0.35;
  will-change: transform, border-radius;
}
.blob-1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, #FF7A3B 0%, transparent 70%);
  top: -200px; left: -100px;
  animation: blobMorph1 18s ease-in-out infinite;
}
.blob-2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #C88CFF 0%, transparent 70%);
  top: 200px; right: -150px;
  animation: blobMorph2 22s ease-in-out infinite;
}
.blob-3 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #7CC4FF 0%, transparent 70%);
  bottom: 400px; left: 20%;
  animation: blobMorph3 16s ease-in-out infinite;
  opacity: 0.2;
}
.blob-4 {
  width: 350px; height: 350px;
  background: radial-gradient(circle, #7FE3C4 0%, transparent 70%);
  bottom: 100px; right: 10%;
  animation: blobMorph1 20s ease-in-out infinite reverse;
  opacity: 0.18;
}
.noise-overlay {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  opacity: 0.4;
}

/* ─── NAV ────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  animation: navReveal 600ms var(--ease-out) both;
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px var(--gutter);
  display: flex;
  align-items: center;
  gap: 32px;
  background: rgba(15,10,13,0.7);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--line);
  transition: background 300ms var(--ease-emph), border-color 300ms;
}
.nav.scrolled .nav-inner {
  background: rgba(15,10,13,0.92);
  border-color: var(--line-strong);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-mark {
  transition: transform 300ms var(--ease-spring);
}
.nav-logo:hover .logo-mark {
  transform: rotate(-6deg) scale(1.08);
}
.logo-text {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}
.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
}
.nav-link {
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dim);
  border-radius: var(--r-pill);
  transition: color 200ms, background 200ms;
}
.nav-link:hover {
  color: var(--text);
  background: var(--primary-soft);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}
.btn-ghost {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--r-pill);
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
  transition: color 200ms, border-color 200ms, background 200ms;
}
.btn-ghost:hover {
  color: var(--text);
  border-color: var(--primary);
  background: var(--primary-soft);
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-on);
  background: var(--primary);
  border-radius: var(--r-pill);
  transition: transform 200ms var(--ease-spring), box-shadow 200ms, background 200ms;
  box-shadow: 0 4px 20px -6px rgba(255,122,59,0.6);
  white-space: nowrap;
}
.btn-primary:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 28px -6px rgba(255,122,59,0.8);
  background: #FF8C52;
}
.btn-primary:active {
  transform: scale(0.97);
}
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  margin-left: auto;
}
.nav-burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 300ms var(--ease-out), opacity 200ms;
}
.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px var(--gutter) 20px;
  background: rgba(15,10,13,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
}
.nav-mobile.open { display: flex; }
.nav-mobile-link {
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-dim);
  border-radius: var(--r-md);
  transition: color 200ms, background 200ms;
}
.nav-mobile-link:hover {
  color: var(--text);
  background: var(--surface);
}

/* ─── HERO ───────────────────────────────────────────────── */
.hero {
  position: relative;
  z-index: 1;
  padding: 140px var(--gutter) 60px;
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: var(--r-pill);
  background: rgba(255,122,59,0.12);
  border: 1px solid rgba(255,122,59,0.28);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  animation: revealUp 600ms 100ms var(--ease-out) both;
}
.pulse-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 2s ease-in-out infinite;
  flex-shrink: 0;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -2px;
  color: var(--text);
  animation: revealUp 700ms 200ms var(--ease-out) both;
}
.hero-gradient {
  background: linear-gradient(135deg, #FFC15C 0%, #FF7A3B 40%, #FF5F9C 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 6s ease-in-out infinite;
}
.hero-sub {
  max-width: 560px;
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-dim);
  line-height: 1.65;
  animation: revealUp 700ms 300ms var(--ease-out) both;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
  animation: revealUp 700ms 400ms var(--ease-out) both;
}
.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-on);
  background: var(--primary);
  border-radius: var(--r-pill);
  transition: transform 250ms var(--ease-spring), box-shadow 250ms;
  box-shadow: 0 6px 30px -6px rgba(255,122,59,0.7), 0 0 0 0 rgba(255,122,59,0.3);
}
.btn-hero-primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 40px -6px rgba(255,122,59,0.9), 0 0 0 6px rgba(255,122,59,0.1);
}
.btn-hero-primary:active { transform: scale(0.97); }
.btn-hero-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  transition: color 200ms, border-color 200ms, transform 200ms var(--ease-spring);
}
.btn-hero-ghost:hover {
  color: var(--text);
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* ─── PHONE MOCKUP ───────────────────────────────────────── */
.hero-phone-wrap {
  position: relative;
  margin-top: 16px;
  margin-bottom: -20px;
  animation: revealScale 900ms 500ms var(--ease-out) both;
}
.hero-phone-glow {
  position: absolute;
  width: 320px; height: 320px;
  background: radial-gradient(circle, rgba(255,122,59,0.4) 0%, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  filter: blur(60px);
  pointer-events: none;
  animation: pulse 4s ease-in-out infinite;
}
.phone-device {
  position: relative;
  width: 280px;
  background: #1A1115;
  border-radius: 44px;
  border: 1.5px solid rgba(255,180,150,0.2);
  box-shadow:
    0 0 0 6px rgba(255,122,59,0.06),
    0 40px 80px -20px rgba(0,0,0,0.8),
    inset 0 1px 0 rgba(255,255,255,0.06);
  overflow: hidden;
  animation: float 6s ease-in-out infinite;
}
.phone-notch {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px; height: 28px;
  background: #0F0A0D;
  border-radius: 20px;
  z-index: 10;
}
.phone-screen {
  position: relative;
  height: 520px;
  background: var(--bg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.phone-home-bar {
  height: 28px;
  background: #1A1115;
  display: flex;
  align-items: center;
  justify-content: center;
}
.phone-home-bar::after {
  content: '';
  width: 100px; height: 4px;
  background: rgba(255,255,255,0.2);
  border-radius: 4px;
}

/* ─── MOCK SCREEN ────────────────────────────────────────── */
.mock-screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 60px 16px 0;
  gap: 16px;
  overflow: hidden;
}
.mock-header {
  display: flex;
  align-items: center;
  gap: 10px;
}
.mock-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--surface);
  border: 1.5px solid var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.mock-header-center { flex: 1; display: flex; justify-content: center; }
.mock-chip {
  padding: 4px 10px;
  border-radius: var(--r-pill);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.3px;
}
.mock-chip-orange {
  background: var(--primary-soft);
  color: var(--primary);
  border: 1px solid rgba(255,122,59,0.3);
}
.mock-timer {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}
.mock-question {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  letter-spacing: -0.3px;
}
.mock-math {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--primary);
}
.mock-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.mock-option {
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  font-size: 13px;
  color: var(--text-dim);
  font-weight: 500;
  transition: all 300ms var(--ease-out);
}
.mock-option-correct {
  background: rgba(93,214,165,0.12);
  border-color: rgba(93,214,165,0.4);
  color: var(--success);
  font-weight: 700;
  animation: revealUp 400ms 800ms var(--ease-out) both;
}
.mock-feedback {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  background: rgba(93,214,165,0.08);
  border: 1px solid rgba(93,214,165,0.2);
  border-radius: var(--r-lg);
  animation: revealUp 500ms 1000ms var(--ease-out) both;
}
.mock-feedback-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: rgba(93,214,165,0.2);
  color: var(--success);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
}
.mock-feedback-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--success);
}
.mock-feedback-text {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 2px;
}
.mock-xp-pop {
  position: absolute;
  top: 200px;
  right: 30px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--warn);
  text-shadow: 0 0 20px rgba(255,193,92,0.6);
  animation: xpPop 2s 1.2s var(--ease-out) both;
  pointer-events: none;
}
.mock-nav {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 70px;
  background: var(--bg-elev);
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  padding: 0 8px;
  gap: 4px;
}
.mock-nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 9px;
  font-weight: 600;
  color: var(--text-mute);
  padding: 8px 4px;
  border-radius: var(--r-md);
  transition: all 200ms;
}
.mock-nav-active {
  color: var(--primary);
  background: var(--primary-soft);
}

/* ─── FLOATING CARDS ─────────────────────────────────────── */
.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  background: rgba(26,17,21,0.85);
  backdrop-filter: blur(16px);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  box-shadow: 0 16px 40px -10px rgba(0,0,0,0.6);
  white-space: nowrap;
}
.float-card-icon {
  width: 32px; height: 32px;
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.float-card-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-mute);
}
.float-card-value {
  font-size: 13px;
  font-weight: 700;
  margin-top: 1px;
}
.float-card-1 {
  top: 60px;
  right: -100px;
  animation: floatCard1 5s ease-in-out infinite;
}
.float-card-2 {
  bottom: 140px;
  right: -110px;
  animation: floatCard2 6s ease-in-out infinite 1s;
}
.float-card-3 {
  bottom: 60px;
  left: -110px;
  animation: floatCard3 5.5s ease-in-out infinite 0.5s;
}

/* ─── STATS BAR ──────────────────────────────────────────── */
.stats-bar {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(26,17,21,0.5);
  backdrop-filter: blur(10px);
  margin: 40px 0;
}
.stats-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 32px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 24px;
}
.stat-item {
  text-align: center;
}
.stat-number {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  letter-spacing: -2px;
  background: linear-gradient(135deg, #FFC15C, #FF7A3B);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 6px;
  font-weight: 500;
}
.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--line-strong);
}

/* ─── SECTIONS SHARED ────────────────────────────────────── */
.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
}
.section-eyebrow::before {
  content: '';
  display: block;
  width: 20px; height: 2px;
  background: var(--primary);
  border-radius: 2px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(36px, 5vw, 60px);
  font-weight: 700;
  letter-spacing: -1.5px;
  line-height: 1.05;
  color: var(--text);
  margin-bottom: 20px;
}
.section-sub {
  font-size: 18px;
  color: var(--text-dim);
  line-height: 1.65;
  max-width: 560px;
  margin-bottom: 60px;
}

/* ─── FEATURES ───────────────────────────────────────────── */
.features {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px var(--gutter);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: 16px;
}
.feature-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  overflow: hidden;
  transition: transform 400ms var(--ease-spring), border-color 300ms, box-shadow 300ms;
}
.feature-card:hover {
  transform: translateY(-6px) scale(1.01);
  border-color: var(--line-strong);
  box-shadow: 0 24px 60px -16px rgba(0,0,0,0.6);
}
.feature-card-large {
  grid-column: span 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.feature-card-wide {
  grid-column: span 3;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
}
.feature-card-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, color-mix(in srgb, var(--card-color) 8%, transparent), transparent 60%);
  pointer-events: none;
}
.feature-card-content {
  padding: 28px;
  position: relative;
  z-index: 1;
}
.feature-icon {
  width: 44px; height: 44px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.feature-tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  background: var(--primary-soft);
  color: var(--primary);
  margin-bottom: 10px;
}
.feature-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
  margin-bottom: 10px;
}
.feature-desc {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 16px;
}
.feature-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.pill {
  padding: 4px 10px;
  border-radius: var(--r-pill);
  font-size: 11px;
  font-weight: 600;
  background: var(--surface-hi);
  color: var(--text-dim);
  border: 1px solid var(--line);
}
.feature-visual {
  position: relative;
  z-index: 1;
  padding: 20px 20px 20px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  justify-content: center;
}
.feature-visual-mini {
  padding: 0 20px 20px;
  position: relative;
  z-index: 1;
}
.feature-visual-memory {
  padding: 20px 28px 20px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  justify-content: center;
}

/* Mini Feed Card */
.mini-feed-card {
  background: var(--surface-hi);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 14px;
}
.mini-feed-subject {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.mini-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  flex-shrink: 0;
}
.mini-feed-q {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
  line-height: 1.3;
}
.mini-feed-opts {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.mini-opt {
  padding: 8px 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  font-size: 12px;
  color: var(--text-dim);
}
.mini-opt-correct {
  background: rgba(93,214,165,0.1);
  border-color: rgba(93,214,165,0.35);
  color: var(--success);
  font-weight: 700;
}
.mini-hint-bubble {
  background: rgba(124,196,255,0.1);
  border: 1px solid rgba(124,196,255,0.25);
  border-radius: var(--r-md);
  padding: 10px 12px;
  font-size: 12px;
  color: var(--analysis);
  line-height: 1.4;
}
.mini-hint-label {
  display: block;
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  margin-bottom: 3px;
  opacity: 0.7;
}

/* Lernplan subjects */
.lernplan-subjects {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 8px;
}
.lp-subject {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.lp-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--c);
  flex-shrink: 0;
}
.lp-count {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-mute);
  font-weight: 500;
}

/* KI-Labor */
.lab-prompt {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--surface-hi);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
  overflow: hidden;
}
.lab-cursor {
  color: var(--geometrie);
  font-weight: 700;
  flex-shrink: 0;
}
.lab-text {
  overflow: hidden;
  white-space: nowrap;
}
.lab-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.lab-chip {
  padding: 4px 10px;
  background: rgba(200,140,255,0.1);
  border: 1px solid rgba(200,140,255,0.2);
  border-radius: var(--r-pill);
  font-size: 11px;
  color: var(--geometrie);
  font-weight: 600;
}

/* Gamification Ring */
.gamif-ring-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 10px;
}
.gamif-ring-center {
  position: absolute;
  text-align: center;
}
.gamif-level {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  line-height: 1;
}
.gamif-title-text {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--primary);
  margin-top: 2px;
}
.gamif-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.gamif-stat {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* GeoGebra Preview */
.geo-preview {
  background: var(--surface-hi);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 12px;
  overflow: hidden;
}
.geo-label {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-dim);
  margin-top: 6px;
}

/* Memory chips */
.memory-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(127,227,196,0.08);
  border: 1px solid rgba(127,227,196,0.2);
  border-radius: var(--r-pill);
  font-size: 12px;
  color: var(--stochastik);
  font-weight: 500;
  white-space: nowrap;
}

/* ─── REVEAL ANIMATION ───────────────────────────────────── */
[data-reveal] {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}
[data-delay="100"] { transition-delay: 100ms; }
[data-delay="150"] { transition-delay: 150ms; }
[data-delay="200"] { transition-delay: 200ms; }
[data-delay="300"] { transition-delay: 300ms; }
[data-delay="400"] { transition-delay: 400ms; }

/* ─── HOW IT WORKS ───────────────────────────────────────── */
.how {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px var(--gutter);
}
.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-top: 20px;
}
.step {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  padding: 0 24px;
}
.step-number {
  font-family: var(--font-display);
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -3px;
  line-height: 1;
  background: linear-gradient(135deg, var(--primary) 0%, rgba(255,122,59,0.2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.step-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
}
.step-desc {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.65;
}
.step-connector {
  flex-shrink: 0;
  width: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 28px;
}
.step-line {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  position: relative;
}
.step-line::after {
  content: '→';
  position: absolute;
  right: -8px;
  top: -10px;
  font-size: 14px;
  color: var(--primary);
}

/* ─── SUBJECTS ───────────────────────────────────────────── */
.subjects {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px var(--gutter);
}
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.subject-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: 28px;
  transition: transform 400ms var(--ease-spring), border-color 300ms, box-shadow 300ms;
  position: relative;
  overflow: hidden;
}
.subject-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top left, color-mix(in srgb, var(--sc) 10%, transparent), transparent 60%);
  pointer-events: none;
}
.subject-card:hover {
  transform: translateY(-8px);
  border-color: var(--sc);
  box-shadow: 0 20px 50px -16px rgba(0,0,0,0.5), 0 0 0 1px var(--sc) inset;
}
.subject-icon {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--sc);
  margin-bottom: 16px;
  line-height: 1;
  text-shadow: 0 0 30px var(--sc);
}
.subject-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.subject-desc {
  font-size: 13px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 16px;
}
.subject-count {
  font-size: 11px;
  font-weight: 700;
  color: var(--sc);
  letter-spacing: 0.3px;
}

/* ─── TEACHER ────────────────────────────────────────────── */
.teacher {
  position: relative;
  z-index: 1;
  background: rgba(26,17,21,0.4);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 100px var(--gutter);
}
.teacher-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.teacher-features {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}
.teacher-feature {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.tf-icon {
  width: 36px; height: 36px;
  border-radius: var(--r-md);
  background: var(--surface-hi);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.tf-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}
.tf-desc {
  font-size: 13px;
  color: var(--text-dim);
}
.coming-soon-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  background: rgba(255,193,92,0.1);
  border: 1px solid rgba(255,193,92,0.3);
  color: var(--warn);
  font-size: 13px;
  font-weight: 700;
}

/* Teacher Card */
.teacher-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: 24px;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.6);
}
.tc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.tc-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.tc-badge {
  font-size: 11px;
  font-weight: 700;
  color: var(--success);
  display: flex;
  align-items: center;
  gap: 4px;
}
.tc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
.tc-desk {
  position: relative;
  background: var(--surface-hi);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  transition: border-color 300ms;
}
.tc-desk-active {
  border-color: rgba(93,214,165,0.3);
  background: rgba(93,214,165,0.05);
}
.tc-desk-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-dim);
}
.tc-desk-ring {
  position: absolute;
  top: 4px; right: 4px;
  width: 8px; height: 8px;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
.tc-ring-green { background: var(--success); }
.tc-ring-yellow { background: var(--warn); }
.tc-ring-red { background: var(--danger); }
.tc-stats {
  display: flex;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.tc-stat { flex: 1; text-align: center; }
.tc-stat-val {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.tc-stat-label {
  font-size: 10px;
  color: var(--text-mute);
  margin-top: 2px;
  font-weight: 500;
}

/* ─── TECH ───────────────────────────────────────────────── */
.tech {
  position: relative;
  z-index: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px var(--gutter);
}
.tech-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.tech-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  transition: transform 300ms var(--ease-spring), border-color 200ms, background 200ms;
}
.tech-item:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  background: var(--surface-hi);
}
.tech-logo {
  flex-shrink: 0;
}
.tech-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.tech-desc {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 1px;
}

/* ─── CTA ────────────────────────────────────────────────── */
.cta {
  position: relative;
  z-index: 1;
  padding: 120px var(--gutter);
  text-align: center;
  overflow: hidden;
}
.cta-glow {
  position: absolute;
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, rgba(255,122,59,0.2) 0%, transparent 70%);
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  filter: blur(40px);
  animation: pulse 5s ease-in-out infinite;
}
.cta-inner {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
}
.cta-title {
  font-family: var(--font-display);
  font-size: clamp(44px, 7vw, 80px);
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.0;
  color: var(--text);
  margin-bottom: 20px;
}
.cta-sub {
  font-size: 18px;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 40px;
}
.cta-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 32px;
  font-size: 17px;
  font-weight: 700;
  color: var(--primary-on);
  background: var(--primary);
  border-radius: var(--r-pill);
  transition: transform 250ms var(--ease-spring), box-shadow 250ms;
  box-shadow: 0 8px 32px -6px rgba(255,122,59,0.7);
}
.btn-cta-primary:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 16px 48px -6px rgba(255,122,59,0.9);
}
.btn-cta-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 18px 28px;
  font-size: 17px;
  font-weight: 600;
  color: var(--text-dim);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  transition: color 200ms, border-color 200ms, transform 200ms var(--ease-spring);
}
.btn-cta-ghost:hover {
  color: var(--text);
  border-color: var(--primary);
  transform: translateY(-2px);
}

/* ─── LOGO HOVER ───────────────────────────────────────────── */
.nav-logo:hover .logo-mark {
  filter: drop-shadow(0 0 12px rgba(255,122,59,0.6));
  transform: rotate(-5deg) scale(1.1);
  transition: filter 300ms, transform 300ms var(--ease-spring);
}
.logo-mark {
  transition: filter 300ms, transform 300ms var(--ease-spring);
}

/* ─── FOOTER ───────────────────────────────────────────────────── */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 60px var(--gutter) 40px;
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}
.footer-brand {
  flex: 1;
  min-width: 200px;
}
.footer-tagline {
  font-size: 14px;
  color: var(--text-dim);
  line-height: 1.65;
  margin-top: 12px;
  max-width: 280px;
}
.footer-links {
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}
.footer-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col-title {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--text-mute);
  margin-bottom: 4px;
}
.footer-link {
  font-size: 14px;
  color: var(--text-dim);
  transition: color 200ms;
}
.footer-link:hover { color: var(--text); }
.footer-bottom {
  border-top: 1px solid var(--line);
}
.footer-bottom-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 20px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-copy {
  font-size: 13px;
  color: var(--text-mute);
}
.footer-github {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-dim);
  transition: color 200ms;
}
.footer-github:hover { color: var(--text); }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .feature-card-large {
    grid-column: span 2;
  }
  .feature-card-wide {
    grid-column: span 2;
    grid-template-columns: 1fr;
  }
  .subjects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .float-card-1, .float-card-2, .float-card-3 {
    display: none;
  }
}
@media (max-width: 768px) {
  .nav-links, .nav-actions .btn-ghost { display: none; }
  .nav-burger { display: flex; }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .feature-card-large {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }
  .feature-card-wide {
    grid-column: span 1;
  }
  .subjects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps {
    flex-direction: column;
    align-items: center;
    gap: 32px;
  }
  .step-connector {
    width: auto;
    height: 40px;
    padding-top: 0;
    transform: rotate(90deg);
  }
  .teacher-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .stat-divider { display: none; }
  .hero { padding-top: 120px; }
}
@media (max-width: 480px) {
  .subjects-grid {
    grid-template-columns: 1fr;
  }
  .hero-title { letter-spacing: -1px; }
  .cta-title { letter-spacing: -1px; }
  .section-title { letter-spacing: -1px; }
}