/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0e1a;
  --bg2: #131829;
  --bg3: #1c2238;
  --bg-card: #161b2e;
  --border: #262d44;
  --border-strong: #3a4364;
  --text: #f1f5f9;
  --text-muted: #8b93b0;
  --text-dim: #5d6585;
  --primary: #6366f1;
  --primary-bright: #818cf8;
  --accent: #06b6d4;
  --accent2: #a855f7;
  --success: #22c55e;
  --danger: #ef4444;
  --warn: #f59e0b;
  --gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #06b6d4 100%);
  --gradient-soft: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(168,85,247,0.12));
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 24px 60px rgba(0,0,0,0.5);

  --map-water: #a6d8e8;
  --map-land: #cbdba2;
  --map-border: #7d9462;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

body.locked {
  overflow: hidden;
  height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 15% 10%, rgba(99,102,241,0.10), transparent 50%),
    radial-gradient(circle at 85% 80%, rgba(168,85,247,0.08), transparent 50%),
    radial-gradient(circle at 60% 30%, rgba(6,182,212,0.06), transparent 50%);
  z-index: -1;
  pointer-events: none;
}

button { font-family: inherit; cursor: pointer; }
a { text-decoration: none; color: inherit; }

/* === SCREENS === */
.screen { display: none; }
.screen.active { display: block; }
#diffScreen.active, #quizScreen.active { display: flex; flex-direction: column; height: 100vh; }
#quizScreen.active { display: block; height: 100vh; }

/* === STICKY TOPNAV (Home) === */
.topnav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  background: rgba(10,14,26,0.65);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(38,45,68,0.5);
  transition: padding 0.3s, background 0.3s;
}

.topnav-brand {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-accent, .grad {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.topnav-app {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  background: var(--gradient);
  color: #fff;
  border-radius: 99px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.2s;
  box-shadow: 0 6px 20px rgba(99,102,241,0.35);
}

.topnav-app:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(99,102,241,0.5);
}

.topnav-app svg { width: 14px; height: 14px; }

/* === LANDING === */
.landing { padding-top: 0; }

/* === HERO === */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 100px 32px 80px;
  overflow: hidden;
  text-align: center;
}

.hero-content {
  position: relative;
  z-index: 2;
  animation: heroFadeIn 1.2s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-eyebrow {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 4px;
  color: var(--text-muted);
  margin-bottom: 24px;
  font-weight: 600;
}

.hero-title {
  font-size: clamp(3.5rem, 13vw, 9rem);
  font-weight: 900;
  letter-spacing: -4px;
  line-height: 1;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto 48px;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 18px 36px;
  background: var(--gradient);
  color: #fff;
  border-radius: 99px;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 14px 40px rgba(99,102,241,0.4);
  transition: all 0.3s;
}

.hero-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 50px rgba(99,102,241,0.55);
}

.hero-cta svg {
  width: 18px;
  height: 18px;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(5px); }
}

/* Hero decorative orbs */
.hero-orbit {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.55;
  animation: floatOrb 18s ease-in-out infinite;
}

.hero-orb-1 {
  width: 500px; height: 500px;
  background: #6366f1;
  top: -100px; left: -100px;
}

.hero-orb-2 {
  width: 400px; height: 400px;
  background: #a855f7;
  bottom: -100px; right: -100px;
  animation-delay: -6s;
}

.hero-orb-3 {
  width: 350px; height: 350px;
  background: #06b6d4;
  top: 40%; left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -12s;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -40px) scale(1.05); }
  66% { transform: translate(-30px, 30px) scale(0.95); }
}

.hero-orb-3 {
  animation: floatOrbCenter 18s ease-in-out infinite;
}

@keyframes floatOrbCenter {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  33% { transform: translate(-30%, -70%) scale(1.1); }
  66% { transform: translate(-70%, -30%) scale(0.9); }
}

/* === FEATURE SECTIONS === */
.feature {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 32px;
  perspective: 1500px;
}

.feature-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.feature-inner.reverse {
  grid-template-columns: 1fr 1fr;
}

.feature-inner.reverse .feature-visual { order: 2; }
.feature-inner.reverse .feature-info   { order: 1; }

/* Initial state (off, rotated for 3D feel) */
.feature-visual {
  opacity: 0;
  transform: perspective(1200px) rotateY(-28deg) translateX(-50px) translateZ(-80px);
  transform-style: preserve-3d;
  transition: opacity 1.4s cubic-bezier(0.16, 1, 0.3, 1),
              transform 1.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.feature-inner.reverse .feature-visual {
  transform: perspective(1200px) rotateY(28deg) translateX(50px) translateZ(-80px);
}

.feature.in-view .feature-visual {
  opacity: 1;
  transform: perspective(1200px) rotateY(0) translateX(0) translateZ(0);
}

.feature-info {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1.1s cubic-bezier(0.16, 1, 0.3, 1) 0.25s,
              transform 1.1s cubic-bezier(0.16, 1, 0.3, 1) 0.25s;
}

.feature.in-view .feature-info {
  opacity: 1;
  transform: translateY(0);
}

.feature-num {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--primary-bright);
  margin-bottom: 16px;
  padding: 5px 14px;
  background: var(--gradient-soft);
  border-radius: 99px;
  border: 1px solid var(--border-strong);
}

.feature-info h2 {
  font-size: clamp(2.2rem, 4.5vw, 3.6rem);
  font-weight: 900;
  letter-spacing: -1.8px;
  line-height: 1.05;
  margin-bottom: 22px;
  background: linear-gradient(180deg, #fff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.feature-info p {
  color: var(--text-muted);
  font-size: 1.1rem;
  line-height: 1.65;
  max-width: 480px;
  margin-bottom: 36px;
}

.feature-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 34px;
  background: var(--gradient);
  border: none;
  border-radius: 99px;
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 12px 35px rgba(99,102,241,0.4);
  transition: all 0.3s;
}

.feature-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 45px rgba(99,102,241,0.55);
}

.feature-btn svg { width: 18px; height: 18px; transition: transform 0.3s; }
.feature-btn:hover svg { transform: translateX(4px); }

/* === VISUAL: GLOBE === */
.visual-globe {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  margin: 0 auto;
  position: relative;
}

.globe-svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 30px 80px rgba(99,102,241,0.35));
  animation: spin 80s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0); }
  to   { transform: rotate(360deg); }
}

.pin {
  filter: drop-shadow(0 0 6px currentColor);
  animation: pulse 2.5s ease-in-out infinite;
}

.pin:nth-of-type(2) { animation-delay: 0.4s; }
.pin:nth-of-type(3) { animation-delay: 0.8s; }

@keyframes pulse {
  0%, 100% { opacity: 1; r: 6; }
  50% { opacity: 0.65; r: 9; }
}

.float-card {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 10px 18px;
  font-weight: 800;
  font-size: 0.95rem;
  color: var(--text);
  box-shadow: 0 12px 30px rgba(0,0,0,0.5);
  animation: floatTag 6s ease-in-out infinite;
}

.float-card-1 { top: 10%; right: -8%; animation-delay: 0s; }
.float-card-2 { bottom: 20%; left: -10%; animation-delay: -2s; }
.float-card-3 { bottom: 5%; right: 8%; animation-delay: -4s; }

@keyframes floatTag {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

/* === VISUAL: FLAGS === */
.flag-stack {
  position: relative;
  width: 100%;
  max-width: 480px;
  height: 360px;
  margin: 0 auto;
}

.flag-card {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200px;
  height: 130px;
  margin: -65px 0 0 -100px;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0,0,0,0.4);
  transform: translate(var(--x, 0), var(--y, 0)) rotate(var(--rot, 0));
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  animation: flagFloat 6s ease-in-out infinite;
  animation-delay: var(--d, 0s);
  border: 2px solid rgba(255,255,255,0.15);
}

.flag-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

@keyframes flagFloat {
  0%, 100% { transform: translate(var(--x, 0), var(--y, 0)) rotate(var(--rot, 0)); }
  50% { transform: translate(var(--x, 0), calc(var(--y, 0) - 14px)) rotate(var(--rot, 0)); }
}

/* === VISUAL: CITY === */
.visual-city {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.city-svg {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 25px 60px rgba(99,102,241,0.3));
}

.city-pin {
  position: absolute;
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 6px 14px rgba(0,0,0,0.5));
  animation: pinBounce 3s ease-in-out infinite;
}

.city-pin svg { width: 100%; height: 100%; }

.city-pin-1 { top: 5%; left: 18%; animation-delay: 0s; }
.city-pin-2 { top: 15%; left: 48%; animation-delay: -1s; }
.city-pin-3 { top: 8%; right: 18%; animation-delay: -2s; }

@keyframes pinBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* === VISUAL: WAVES === */
.visual-wave {
  width: 100%;
  max-width: 560px;
  margin: 0 auto;
  position: relative;
}

.wave-svg {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 20px 50px rgba(6,182,212,0.3));
}

.wave-svg path {
  animation: waveMove 8s ease-in-out infinite;
  transform-origin: center;
}

.wave-svg path:nth-of-type(2) { animation-delay: -2s; }
.wave-svg path:nth-of-type(3) { animation-delay: -4s; }

@keyframes waveMove {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(-15px); }
}

.wave-svg circle {
  animation: bubble 4s ease-in-out infinite;
}

.wave-svg circle:nth-of-type(2) { animation-delay: -1s; }
.wave-svg circle:nth-of-type(3) { animation-delay: -2s; }

@keyframes bubble {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
  50% { transform: translateY(-15px) scale(1.1); opacity: 0.9; }
}

.wave-label {
  position: absolute;
  background: rgba(20,26,46,0.95);
  border: 1px solid var(--border-strong);
  border-radius: 99px;
  padding: 6px 14px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text);
  box-shadow: 0 8px 20px rgba(0,0,0,0.4);
  animation: floatTag 5s ease-in-out infinite;
}

.wave-label-1 { top: 12%; left: 8%; animation-delay: 0s; }
.wave-label-2 { top: 22%; right: 12%; animation-delay: -1.5s; }
.wave-label-3 { top: 38%; left: 30%; animation-delay: -3s; }

/* === VISUAL: LANDMARKS === */
.visual-landmarks {
  width: 100%;
  max-width: 480px;
  aspect-ratio: 1;
  margin: 0 auto;
  position: relative;
}

.lm {
  position: absolute;
  filter: drop-shadow(0 10px 25px rgba(0,0,0,0.4));
  animation: lmFloat 6s ease-in-out infinite;
}

.lm-1 { top: 0; left: 50%; transform: translateX(-50%); width: 26%; height: 36%; animation-delay: 0s; }
.lm-2 { top: 28%; left: 0; width: 32%; height: 26%; animation-delay: -1s; }
.lm-3 { top: 22%; right: 0; width: 24%; height: 38%; animation-delay: -2s; }
.lm-4 { bottom: 5%; left: 18%; width: 22%; height: 36%; animation-delay: -3s; }
.lm-5 { bottom: 0; right: 15%; width: 26%; height: 38%; animation-delay: -4s; }

.lm svg { width: 100%; height: 100%; }

@keyframes lmFloat {
  0%, 100% { transform: translateY(0) rotate(0); }
  50% { transform: translateY(-12px) rotate(2deg); }
}

.lm-1 { animation: lmFloatCenter 6s ease-in-out infinite; }

@keyframes lmFloatCenter {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-12px); }
}

/* === FOOTER === */
.landing-foot {
  padding: 60px 32px 40px;
  border-top: 1px solid var(--border);
  background: rgba(10,14,26,0.5);
}

.foot-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.foot-brand {
  font-size: 1.2rem;
  font-weight: 800;
}

.landing-foot p {
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* === TOPBAR (Diff/Quiz) === */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 36px;
  border-bottom: 1px solid var(--border);
  background: rgba(10,14,26,0.7);
  backdrop-filter: blur(20px);
  gap: 16px;
}

.brand { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.5px; }

.topbar-btn, .topbar-btn-back {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-muted);
  transition: all 0.2s;
}

.topbar-btn svg, .topbar-btn-back svg { width: 18px; height: 18px; }

.topbar-btn:hover { background: var(--bg3); border-color: var(--primary); color: var(--primary-bright); }
.topbar-btn-back:hover { background: var(--bg3); color: var(--text); transform: translateX(-2px); }

/* === DIFFICULTY SCREEN === */
.diff-main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 48px 36px 40px;
  overflow-y: auto;
}

.diff-head { text-align: center; margin-bottom: 48px; }

.diff-head h1 {
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 8px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.diff-head p { color: var(--text-muted); font-size: 1.05rem; }

.diff-section { margin-bottom: 40px; }

.diff-section-title {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  font-weight: 700;
  margin-bottom: 16px;
  padding-left: 4px;
}

.diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.diff-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 20px;
  text-align: left;
  color: var(--text);
  transition: all 0.2s;
  position: relative;
  overflow: hidden;
}

.diff-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-soft);
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}

.diff-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.diff-card:hover::before { opacity: 1; }

.diff-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 12px;
  position: relative;
}

.diff-easy   { background: rgba(34,197,94,0.18);  color: #4ade80; }
.diff-medium { background: rgba(6,182,212,0.18);  color: #22d3ee; }
.diff-hard   { background: rgba(245,158,11,0.18); color: #fbbf24; }
.diff-expert { background: rgba(239,68,68,0.18);  color: #f87171; }

.diff-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; position: relative; }
.diff-card p { color: var(--text-muted); font-size: 0.86rem; position: relative; }

.continent-list { display: grid; grid-template-columns: 1fr; gap: 10px; }

.continent-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 20px;
  gap: 12px;
  flex-wrap: wrap;
}

.continent-row:hover { border-color: var(--border-strong); }

.cont-name { font-size: 1.05rem; font-weight: 700; color: var(--text); }

.cont-btns { display: flex; gap: 8px; flex-wrap: wrap; }

.cont-btn {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 9px 16px;
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all 0.15s;
}

.cont-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-1px); }

/* === QUIZ SCREEN === */
#quizScreen { position: relative; }

#map {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: var(--map-water);
  cursor: crosshair;
}

.leaflet-container { background: var(--map-water) !important; outline: none; }
.leaflet-interactive { outline: none !important; cursor: pointer; }

.inset {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 80;
  width: 300px;
  height: 200px;
  background: var(--map-water);
  border: 3px solid #fff;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  transition: opacity 0.3s, transform 0.3s;
}

.inset.hidden {
  opacity: 0;
  transform: scale(0.85) translateY(20px);
  pointer-events: none;
}

.inset-map { width: 100%; height: 100%; background: var(--map-water); }

.inset-label {
  position: absolute;
  top: 8px;
  left: 10px;
  z-index: 5;
  background: rgba(255,255,255,0.97);
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #1a2240;
  pointer-events: none;
  letter-spacing: 0.3px;
}

.hud {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 12px;
  pointer-events: none;
}

.hud > * { pointer-events: auto; }

.hud-close {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(20,26,46,0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  color: var(--text-muted);
  transition: all 0.2s;
}

.hud-close svg { width: 20px; height: 20px; }
.hud-close:hover { background: rgba(239,68,68,0.18); color: var(--danger); border-color: var(--danger); }

.hud-stats {
  display: flex; align-items: stretch;
  background: rgba(20,26,46,0.95);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  overflow: hidden;
}

.hud-stat {
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  padding: 8px 18px; min-width: 80px;
}

.hud-stat-label {
  font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 1px; color: var(--text-dim); font-weight: 600;
}

.hud-stat-value { font-size: 1.05rem; font-weight: 700; color: var(--text); margin-top: 2px; }

.hud-prompt {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 22px;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  background: var(--gradient-soft);
  min-width: 240px;
  justify-content: center;
}

.hud-prompt-label { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.8px; font-weight: 600; }
.hud-prompt-value { font-size: 1.15rem; font-weight: 800; color: var(--text); letter-spacing: -0.3px; }
.hud-prompt-flag { display: none; height: 32px; width: auto; border-radius: 4px; box-shadow: 0 2px 8px rgba(0,0,0,0.4); }
.hud-prompt.flag-mode .hud-prompt-value { display: none; }
.hud-prompt.flag-mode .hud-prompt-flag { display: block; }

.cursor-tip {
  position: fixed; top: 0; left: 0;
  z-index: 90; pointer-events: none;
  background: rgba(20,26,46,0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--primary);
  border-radius: 99px;
  padding: 7px 16px;
  font-size: 0.9rem; font-weight: 700;
  color: var(--text); white-space: nowrap;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  transform: translate(-50%, calc(-100% - 14px));
  display: none; align-items: center; gap: 8px;
}

.cursor-tip.visible { display: inline-flex; }
.cursor-tip img { display: none; height: 18px; width: auto; border-radius: 2px; }
.cursor-tip.flag-mode span { display: none; }
.cursor-tip.flag-mode img { display: inline-block; }

.overlay {
  position: fixed; inset: 0; z-index: 200;
  background: rgba(10,14,26,0.88);
  backdrop-filter: blur(10px);
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}

.overlay.hidden { display: none; }

.overlay-card {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 44px 40px;
  max-width: 460px; width: 100%;
  text-align: center;
  box-shadow: var(--shadow);
}

.overlay-card h2 { font-size: 1.9rem; font-weight: 800; margin-bottom: 12px; letter-spacing: -0.5px; }
.overlay-card > p { color: var(--text-muted); margin-bottom: 28px; }

.overlay-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 8px; }

.btn {
  border: none; border-radius: 12px;
  padding: 13px 30px; font-size: 0.95rem;
  font-weight: 700; transition: all 0.2s;
}

.btn-primary {
  background: var(--gradient); color: #fff;
  box-shadow: 0 8px 25px rgba(99,102,241,0.35);
}

.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 30px rgba(99,102,241,0.5); }

.btn-ghost {
  background: transparent; color: var(--text-muted);
  border: 1px solid var(--border-strong);
}

.btn-ghost:hover { background: var(--bg3); color: var(--text); }

.result-score {
  font-size: 3rem; font-weight: 900; margin: 8px 0 12px;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.result-stats {
  display: flex; justify-content: space-around;
  margin: 28px 0; padding: 20px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.result-stats div { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.result-stats b { font-size: 1.5rem; font-weight: 800; }
.result-stats span { font-size: 0.78rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.8px; }

.spinner {
  width: 44px; height: 44px;
  margin: 0 auto 20px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spinAnim 0.9s linear infinite;
}

@keyframes spinAnim { to { transform: rotate(360deg); } }

.feedback-pop {
  position: fixed; z-index: 95;
  pointer-events: none;
  font-size: 1.4rem; font-weight: 800;
  padding: 10px 20px; border-radius: 99px;
  transform: translate(-50%, -50%);
  animation: pop 0.9s ease-out forwards;
}

.feedback-pop.ok  { background: rgba(34,197,94,0.96); color: #fff; }
.feedback-pop.bad { background: rgba(239,68,68,0.96); color: #fff; }

@keyframes pop {
  0% { opacity: 0; transform: translate(-50%, -30%) scale(0.6); }
  20% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
  40% { transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -90%) scale(0.9); }
}

/* === MOBILE === */
@media (max-width: 900px) {
  .feature-inner { grid-template-columns: 1fr; gap: 40px; }
  .feature-inner.reverse .feature-visual { order: 0; }
  .feature-inner.reverse .feature-info { order: 1; }
  .feature { padding: 80px 24px; min-height: auto; }
  .feature-visual { transform: perspective(1200px) rotateX(15deg) translateY(40px); }
  .feature-inner.reverse .feature-visual { transform: perspective(1200px) rotateX(15deg) translateY(40px); }
  .feature.in-view .feature-visual { transform: perspective(1200px) rotateX(0) translateY(0); }
  .feature.in-view .feature-inner.reverse .feature-visual { transform: perspective(1200px) rotateX(0) translateY(0); }
}

@media (max-width: 720px) {
  .topnav { padding: 12px 20px; }
  .topnav-app { padding: 8px 14px; font-size: 0.85rem; }
  .hero { padding: 90px 20px 60px; }
  .hero-eyebrow { font-size: 0.75rem; letter-spacing: 3px; }

  .feature { padding: 60px 20px; }
  .feature-num { font-size: 0.7rem; padding: 4px 11px; }
  .feature-btn { padding: 14px 26px; font-size: 0.92rem; }

  .visual-globe, .flag-stack, .visual-landmarks { max-width: 320px; }
  .visual-city, .visual-wave { max-width: 400px; }
  .flag-stack { height: 280px; }
  .flag-card { width: 160px; height: 105px; margin: -52px 0 0 -80px; }

  .topbar { padding: 16px 20px; }
  .diff-main { padding: 32px 20px 24px; }

  .hud { top: 10px; gap: 8px; width: calc(100vw - 20px); }
  .hud-stats { flex: 1; }
  .hud-stat { min-width: 56px; padding: 6px 10px; }
  .hud-stat-label { font-size: 0.6rem; }
  .hud-stat-value { font-size: 0.9rem; }
  .hud-prompt { min-width: 0; padding: 8px 12px; }
  .hud-prompt-label { display: none; }
  .hud-prompt-value { font-size: 0.95rem; }
  .hud-close { width: 40px; height: 40px; }

  .inset { width: 180px; height: 130px; bottom: 12px; right: 12px; border-width: 2px; }
  .inset-label { font-size: 0.6rem; padding: 2px 8px; }

  .overlay-card { padding: 32px 24px; }
  .overlay-card h2 { font-size: 1.5rem; }
  .result-score { font-size: 2.4rem; }
  .result-stats b { font-size: 1.2rem; }
}