/* FitTalk Website - Dark Mode Design */
/* Based on app design benchmarking: Neon Energy palette */

:root {
  /* Colors - Neon Energy Palette */
  --bg-primary: #0A0A0F;
  --bg-secondary: #12121A;
  --bg-surface: #1A1A24;
  --bg-card: #1E1E2A;

  /* Neon Accents */
  --accent-cyan: #00F5D4;
  --accent-purple: #9B5DE5;
  --accent-pink: #F15BB5;
  --accent-blue: #00BBF9;

  /* Gradient */
  --gradient-primary: linear-gradient(135deg, #00F5D4, #00BBF9);
  --gradient-secondary: linear-gradient(135deg, #9B5DE5, #F15BB5);
  --gradient-energy: linear-gradient(135deg, #00F5D4, #9B5DE5);

  /* Status */
  --success: #00E676;
  --warning: #FFB800;
  --danger: #FF5252;

  /* Text */
  --text-primary: #FFFFFF;
  --text-secondary: #A0A0B0;
  --text-muted: #606070;

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-light: rgba(255, 255, 255, 0.12);

  /* Shadows */
  --shadow-glow-cyan: 0 0 30px rgba(0, 245, 212, 0.3);
  --shadow-glow-purple: 0 0 30px rgba(155, 93, 229, 0.3);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);

  /* Typography */
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-korean: 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }

p {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.7;
}

/* Korean Typography */
html[lang="ko"] body,
html[lang="ko"] p,
html[lang="ko"] span,
html[lang="ko"] a,
html[lang="ko"] button,
[data-lang="ko"] {
  font-family: var(--font-korean);
}

html[lang="ko"] h1,
html[lang="ko"] h2,
html[lang="ko"] h3,
html[lang="ko"] h4,
html[lang="ko"] h5,
html[lang="ko"] h6 {
  font-family: var(--font-korean);
  letter-spacing: -0.03em;
}

a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-blue);
}

/* Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-md) 0;
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  height: 58px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
}

.lang-switch {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-xs);
  background: var(--bg-surface);
  border-radius: var(--radius-full);
}

.lang-btn {
  padding: var(--space-xs) var(--space-md);
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background: var(--accent-cyan);
  color: var(--bg-primary);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  background:
    radial-gradient(ellipse at 20% 80%, rgba(0, 245, 212, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(155, 93, 229, 0.1) 0%, transparent 50%),
    var(--bg-primary);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-text {
  max-width: 560px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-cyan);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes fadeInUp {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.hero-title {
  margin-bottom: var(--space-lg);
  animation: fadeInUp 0.8s ease-out forwards;
}

.hero-title .gradient-text {
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue), var(--accent-purple), var(--accent-cyan));
  background-size: 300% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 4s ease infinite;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  position: relative;
}

/* Phone Mockup Styles */
.hero-phone-mockup {
  position: relative;
  width: 280px;
  height: 560px;
  background: linear-gradient(145deg, #1a1a24 0%, #0a0a0f 100%);
  border-radius: 44px;
  padding: 12px;
  box-shadow:
    var(--shadow-glow-purple),
    0 25px 80px rgba(0, 0, 0, 0.6),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(155, 93, 229, 0.3);
}

.phone-notch {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 28px;
  background: #000;
  border-radius: 0 0 16px 16px;
  z-index: 10;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background: var(--bg-primary);
  border-radius: 36px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

.phone-status-bar {
  position: absolute;
  top: 16px;
  left: 0;
  right: 0;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
}

.status-icons {
  display: flex;
  gap: 4px;
  align-items: center;
}

.status-icons svg {
  opacity: 0.7;
}

.phone-brand-logo {
  position: absolute;
  top: 50px;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
}

.phone-brand-logo img {
  height: 24px;
  width: auto;
  opacity: 0.9;
}

.lottie-wave {
  width: 200px;
  height: 200px;
  margin-top: 20px;
  filter: drop-shadow(0 0 30px rgba(155, 93, 229, 0.4));
}

.phone-bottom-text {
  position: absolute;
  bottom: 80px;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  animation: pulse 2s ease-in-out infinite;
}

.phone-home-indicator {
  position: absolute;
  bottom: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 5px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
}

/* Old styles removed */
.hero-phone {
  position: relative;
  width: 280px;
}

.hero-phone-frame {
  width: 100%;
  border-radius: 40px;
  box-shadow: var(--shadow-glow-cyan), var(--shadow-card);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--bg-primary);
  box-shadow: var(--shadow-glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0, 245, 212, 0.4);
  color: var(--bg-primary);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  background: var(--bg-card);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

.btn-store {
  padding: var(--space-sm) var(--space-lg);
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
}

.btn-store img {
  height: 40px;
  width: auto;
}

/* Features Section */
.features {
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-3xl);
}

.section-header h2 {
  margin-bottom: var(--space-md);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.feature-card {
  padding: var(--space-xl);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000000;
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-lg);
  font-size: 1.5rem;
  border: 1px solid var(--border-light);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  color: var(--accent-cyan);
}

.feature-icon svg path,
.feature-icon svg rect,
.feature-icon svg line,
.feature-icon svg circle,
.feature-icon svg polyline {
  stroke: var(--accent-cyan) !important;
  fill: none !important;
}

.feature-card h3 {
  margin-bottom: var(--space-sm);
}

/* Screenshots Section */
.screenshots {
  overflow: hidden;
  padding-bottom: var(--space-3xl);
}

.screenshots-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  padding: var(--space-xl) var(--space-lg);
  align-items: center;
}

.screenshots-row {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.screenshot-item {
  flex: 0 0 auto;
  transition: all var(--transition-base);
  position: relative;
}

.screenshot-item img {
  width: 200px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
  border: 1px solid var(--border-subtle);
}

.screenshot-item:hover {
  z-index: 10;
}

.screenshot-item:hover img {
  transform: scale(1.08) translateY(-8px);
  box-shadow: 0 20px 60px rgba(0, 245, 212, 0.2), var(--shadow-card);
  border-color: var(--accent-cyan);
}

/* Staggered animation for screenshots - Row 1 */
.screenshots-row:first-child .screenshot-item:nth-child(1) { animation: fadeInUp 0.5s ease-out 0.1s forwards; opacity: 0; }
.screenshots-row:first-child .screenshot-item:nth-child(2) { animation: fadeInUp 0.5s ease-out 0.15s forwards; opacity: 0; }
.screenshots-row:first-child .screenshot-item:nth-child(3) { animation: fadeInUp 0.5s ease-out 0.2s forwards; opacity: 0; }
.screenshots-row:first-child .screenshot-item:nth-child(4) { animation: fadeInUp 0.5s ease-out 0.25s forwards; opacity: 0; }

/* Staggered animation for screenshots - Row 2 */
.screenshots-row:last-child .screenshot-item:nth-child(1) { animation: fadeInUp 0.5s ease-out 0.3s forwards; opacity: 0; }
.screenshots-row:last-child .screenshot-item:nth-child(2) { animation: fadeInUp 0.5s ease-out 0.35s forwards; opacity: 0; }
.screenshots-row:last-child .screenshot-item:nth-child(3) { animation: fadeInUp 0.5s ease-out 0.4s forwards; opacity: 0; }
.screenshots-row:last-child .screenshot-item:nth-child(4) { animation: fadeInUp 0.5s ease-out 0.45s forwards; opacity: 0; }

@media (min-width: 1400px) {
  .screenshot-item img {
    width: 220px;
  }
}

@media (max-width: 968px) {
  .screenshot-item img {
    width: 160px;
  }

  .screenshots-row {
    gap: var(--space-sm);
  }
}

@media (max-width: 768px) {
  .screenshot-item img {
    width: 140px;
  }
}

@media (max-width: 640px) {
  .screenshots-row {
    flex-wrap: wrap;
    justify-content: center;
  }

  .screenshot-item img {
    width: 120px;
  }
}

/* FAQ Section */
.faq {
  background: var(--bg-secondary);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid var(--border-subtle);
}

.faq-question {
  width: 100%;
  padding: var(--space-lg) 0;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent-cyan);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding-bottom: var(--space-lg);
}

/* Download Section */
.download {
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(0, 245, 212, 0.15) 0%, transparent 60%),
    var(--bg-primary);
}

.download-content {
  max-width: 600px;
  margin: 0 auto;
}

.download h2 {
  margin-bottom: var(--space-md);
}

.download p {
  margin-bottom: var(--space-xl);
}

.store-buttons {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
}

.qr-section {
  display: flex;
  gap: var(--space-xl);
  justify-content: center;
  margin-top: var(--space-xl);
}

.qr-item {
  text-align: center;
}

.qr-item img {
  width: 120px;
  height: 120px;
  background: white;
  padding: var(--space-sm);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
}

.qr-item span {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-subtle);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.footer-logo {
  height: 24px;
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
}

.footer-link {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-link:hover {
  color: var(--text-primary);
}

.footer-copy {
  text-align: right;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Language Toggle Content */
[data-lang="ko"] { display: none; }
[data-lang="en"] { display: block; }

html[lang="ko"] [data-lang="ko"] { display: block; }
html[lang="ko"] [data-lang="en"] { display: none; }

/* Responsive */
@media (max-width: 968px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-text {
    max-width: 100%;
  }

  .hero-cta {
    justify-content: center;
  }

  .hero-phone {
    width: 240px;
  }

  .hero-phone-mockup {
    width: 240px;
    height: 480px;
  }

  .lottie-wave {
    width: 200px;
    height: 200px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .section {
    padding: var(--space-2xl) 0;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .qr-section {
    flex-direction: column;
    align-items: center;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .hero-phone {
    width: 200px;
  }

  .hero-phone-mockup {
    width: 200px;
    height: 400px;
    border-radius: 36px;
    padding: 8px;
  }

  .phone-notch {
    width: 80px;
    height: 22px;
    top: 8px;
  }

  .phone-screen {
    border-radius: 30px;
  }

  .phone-brand-logo {
    top: 40px;
  }

  .phone-brand-logo img {
    height: 20px;
  }

  .lottie-wave {
    width: 160px;
    height: 160px;
  }

  .phone-bottom-text {
    font-size: 0.8rem;
    bottom: 60px;
  }

  .phone-home-indicator {
    width: 100px;
    height: 4px;
    bottom: 6px;
  }

  .store-buttons {
    flex-direction: column;
    align-items: center;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Legal Pages */
.legal-page {
  padding-top: 100px;
  min-height: 100vh;
}

.legal-content {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
}

.legal-content h1 {
  margin-bottom: var(--space-lg);
}

.legal-content h2 {
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  font-size: 1.5rem;
}

.legal-content p,
.legal-content li {
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.legal-content ul {
  padding-left: var(--space-lg);
}

.legal-content .last-updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-xl);
}

.legal-content h3 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  font-size: 1.2rem;
  color: var(--accent-cyan);
}

.legal-content .faq-item {
  background: var(--bg-surface);
  border-radius: 12px;
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  border: 1px solid var(--border-subtle);
}

.legal-content .faq-item p {
  margin-bottom: var(--space-sm);
}

.legal-content .faq-item p:last-child {
  margin-bottom: 0;
}

.legal-content .faq-item strong {
  color: var(--text-primary);
}

.legal-content .faq-item ul {
  margin-top: var(--space-sm);
  margin-bottom: 0;
}

.legal-content a {
  color: var(--accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.legal-content a:hover {
  color: var(--accent-purple);
  text-decoration: underline;
}