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

:root {
  --bg: #0a0a0a;
  --surface: #141414;
  --surface-light: #1e1e1e;
  --gold: #c9b99a;
  --gold-dim: #8a7d65;
  --text: #e8e0d4;
  --text-secondary: #8a8478;
  --divider: #2a2a2a;
  --serif: 'Noto Serif SC', serif;
  --mono: 'JetBrains Mono', monospace;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  overflow-x: hidden;
  line-height: 1.6;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Particle Canvas ===== */
#particles {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 10, 10, 0.6);
  border-bottom: 1px solid rgba(201, 185, 154, 0.08);
  transition: padding 0.3s;
}

.nav.scrolled {
  padding: 14px 40px;
}

.nav-logo {
  font-size: 20px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 4px;
}

.nav-download {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--gold);
  text-decoration: none;
  border: 1px solid var(--gold-dim);
  padding: 8px 20px;
  border-radius: 4px;
  transition: all 0.3s;
}

.nav-download:hover {
  background: var(--gold);
  color: var(--bg);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.hero-content {
  position: relative;
}

.hero-eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 300;
  letter-spacing: 12px;
  color: var(--gold-dim);
  margin-bottom: 40px;
  opacity: 0;
  animation: fadeUp 1s 0.3s forwards;
}

.hero-title {
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 200;
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 32px;
}

.hero-title .line {
  display: block;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 1s forwards;
}

.hero-title .line[data-delay="0"] { animation-delay: 0.6s; }
.hero-title .line[data-delay="1"] { animation-delay: 1s; }

.hero-sub {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-secondary);
  letter-spacing: 2px;
  opacity: 0;
  animation: fadeUp 1s 1.4s forwards;
}

.hero-scroll-hint {
  position: absolute;
  bottom: -120px;
  left: 50%;
  transform: translateX(-50%);
  opacity: 0;
  animation: fadeIn 1s 2s forwards;
}

.scroll-dot {
  display: block;
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--gold), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

/* ===== Philosophy ===== */
.philosophy {
  position: relative;
  z-index: 1;
  padding: 160px 0 120px;
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
}

.philosophy-item {
  padding: 40px 32px;
  border: 1px solid var(--divider);
  border-radius: 16px;
  background: linear-gradient(145deg, rgba(20,20,20,0.8), rgba(10,10,10,0.4));
  backdrop-filter: blur(10px);
  transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.philosophy-item:hover {
  border-color: var(--gold-dim);
  transform: translateY(-8px);
  box-shadow: 0 20px 60px rgba(201, 185, 154, 0.06);
}

.philosophy-number {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold-dim);
  letter-spacing: 2px;
  margin-bottom: 24px;
}

.philosophy-item h3 {
  font-size: 22px;
  font-weight: 400;
  color: var(--gold);
  margin-bottom: 16px;
}

.philosophy-item p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
}

/* ===== Ticker ===== */
.ticker {
  position: relative;
  z-index: 1;
  padding: 60px 0;
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
  overflow: hidden;
}

.ticker-track {
  display: flex;
  width: max-content;
}

.ticker-content {
  display: flex;
  align-items: center;
  gap: 32px;
  animation: tickerScroll 20s linear infinite;
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 200;
  color: var(--divider);
  white-space: nowrap;
}

.ticker-content .dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-dim);
  opacity: 0.4;
}

/* ===== Features ===== */
.features {
  position: relative;
  z-index: 1;
  padding: 140px 0;
}

.section-title {
  text-align: center;
  font-size: clamp(24px, 3.5vw, 36px);
  font-weight: 300;
  color: var(--text);
  margin-bottom: 72px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  text-align: center;
  padding: 40px 20px;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid transparent;
  transition: all 0.4s;
}

.feature-card:hover {
  border-color: var(--divider);
  background: var(--surface-light);
}

.feature-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 20px;
  color: var(--gold);
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-card h4 {
  font-size: 16px;
  font-weight: 400;
  color: var(--text);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== Quotes ===== */
.quotes {
  position: relative;
  z-index: 1;
  padding: 120px 0;
}

.quote-wrapper {
  text-align: center;
  position: relative;
  padding: 60px 40px;
  border: 1px solid var(--divider);
  border-radius: 24px;
  background: linear-gradient(145deg, var(--surface), transparent);
  cursor: pointer;
  transition: border-color 0.3s;
  user-select: none;
}

.quote-wrapper:hover {
  border-color: var(--gold-dim);
}

.quote-mark {
  font-family: var(--serif);
  font-size: 80px;
  font-weight: 200;
  color: var(--gold-dim);
  opacity: 0.3;
  line-height: 1;
  margin-bottom: -20px;
}

.quote-text {
  font-size: clamp(18px, 2.5vw, 28px);
  font-weight: 300;
  color: var(--text);
  line-height: 1.8;
  min-height: 1.8em;
  transition: opacity 0.4s;
}

.quote-text.fade-out {
  opacity: 0;
}

.quote-cursor {
  display: inline-block;
  width: 2px;
  height: 24px;
  background: var(--gold);
  margin-left: 4px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

/* ===== Download ===== */
.download {
  position: relative;
  z-index: 1;
  padding: 160px 0;
  text-align: center;
}

.download-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 8px;
  color: var(--gold-dim);
  margin-bottom: 24px;
}

.download-title {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 200;
  color: var(--text);
  margin-bottom: 20px;
}

.download-sub {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 2;
  margin-bottom: 48px;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 16px 40px;
  background: var(--gold);
  color: var(--bg);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 16px;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.download-btn::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transition: left 0.5s;
}

.download-btn:hover::after {
  left: 100%;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(201, 185, 154, 0.25);
}

.download-note {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 16px;
  letter-spacing: 1px;
}

/* ===== Footer ===== */
.footer {
  position: relative;
  z-index: 1;
  padding: 60px 0;
  border-top: 1px solid var(--divider);
  text-align: center;
}

.footer-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--gold);
  letter-spacing: 4px;
  margin-bottom: 8px;
}

.footer-en {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 300;
  color: var(--gold-dim);
  letter-spacing: 2px;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== Reveal Animation ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Keyframes ===== */
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.3); transform-origin: top; }
}

@keyframes tickerScroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

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

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav { padding: 16px 20px; }
  .nav.scrolled { padding: 12px 20px; }

  .philosophy-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .philosophy-item { padding: 32px 24px; }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .feature-card { padding: 32px 16px; }

  .quote-wrapper { padding: 40px 24px; }
  .quote-mark { font-size: 48px; }

  .download-btn { padding: 14px 32px; font-size: 15px; }
}

@media (max-width: 480px) {
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
}