@import url("https://fonts.googleapis.com/css2?family=Instrument+Sans:wght@400;500;600;700&display=swap");

:root {
  --gold: #B08D57;
  --gold-light: #D6B584;
  --ink: #111827;
  --gray: #6B7280;
  --gray-dark: #374151;
  --border: #E5E7EB;
  --bg-soft: #F8FAFC;
  --dark-bg: #0E0E11;
  --hero-bg: #0B0B0D;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Instrument Sans", Pretendard, -apple-system, sans-serif;
  color: var(--ink);
  background: #FFFFFF;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
}

* {
  box-sizing: border-box;
}

a {
  text-decoration: none;
}

img {
  max-width: 100%;
}

@keyframes kenburns {
  0% { transform: scale(1.02); }
  100% { transform: scale(1.12); }
}

@keyframes fadeUp {
  0% { opacity: 0; transform: translateY(24px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ============ HEADER ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 12, 0.25);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  transition: background .3s, border-color .3s;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.85);
  border-bottom-color: var(--border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo {
  height: 24px;
  display: block;
  filter: none;
  transition: filter .3s;
}

.site-header.is-scrolled .brand-logo {
  filter: invert(1);
}

.brand-tag {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  line-height: 1;
  align-self: center;
  transform: translateY(2.5px);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: #FFFFFF;
  transition: color .3s;
}

.site-header.is-scrolled .nav-link {
  color: var(--ink);
}

.nav-cta {
  font-size: 14px;
  font-weight: 600;
  background: #FFFFFF;
  color: #111111;
  padding: 11px 24px;
  border-radius: 999px;
  transition: background .3s, color .3s;
}

.site-header.is-scrolled .nav-cta {
  background: #111111;
  color: #FFFFFF;
}

/* ============ HERO ============ */
.hero {
  position: relative;
  height: 100vh;
  min-height: 680px;
  overflow: hidden;
  background: var(--hero-bg);
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.6s ease;
}

.hero-slide.is-active {
  opacity: 1;
}

.hero-slide-img {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  animation: kenburns 14s ease-out infinite alternate;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(8, 8, 10, 0.55) 0%, rgba(8, 8, 10, 0.35) 45%, rgba(8, 8, 10, 0.72) 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 24px;
}

.hero-inner {
  animation: fadeUp .9s ease both;
}

.hero-eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-light);
  margin-bottom: 24px;
}

.hero-title {
  margin: 0;
  font-size: 82px;
  line-height: 1.04;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  max-width: 900px;
  text-wrap: balance;
}

.hero-sub {
  margin: 28px 0 0;
  font-size: 19px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.82);
  max-width: 560px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 40px;
}

.btn-white {
  background: #FFFFFF;
  color: #111111;
  font-size: 15px;
  font-weight: 600;
  padding: 16px 34px;
  border-radius: 999px;
  display: inline-block;
  transition: background .2s;
}

.btn-white:hover {
  background: #E9E4DA;
}

.hero-dots {
  position: absolute;
  bottom: 36px;
  left: 24px;
  display: flex;
  gap: 8px;
}

.hero-dot {
  width: 16px;
  height: 4px;
  border: none;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  padding: 0;
  transition: all .5s;
}

.hero-dot.is-active {
  width: 34px;
  background: var(--gold-light);
}

/* ============ SECTION SHARED ============ */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 140px 24px;
}

.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 18px;
}

.eyebrow.on-dark {
  color: var(--gold-light);
}

.heading {
  margin: 0;
  font-size: 50px;
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--ink);
  text-wrap: balance;
}

.heading.on-dark {
  color: #FFFFFF;
}

/* ============ ABOUT ============ */
.about {
  padding: 140px 24px 120px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-grid .heading {
  max-width: 900px;
}

.about-desc {
  margin: 8px 0 0;
  font-size: 18px;
  line-height: 1.7;
  color: var(--gray);
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 72px;
}

.about-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 32px;
  transition: border-color .3s;
}

.about-card:hover {
  border-color: var(--gold);
}

.card-num {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.card-title {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-top: 14px;
}

.card-desc {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.65;
  color: var(--gray);
}

/* ============ TRACKS ============ */
.tracks-section {
  background: var(--dark-bg);
  padding: 140px 0;
}

.tracks-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.tracks-sub {
  margin: 20px 0 0;
  font-size: 17px;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.6);
  max-width: 560px;
}

.tracks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 64px;
}

.track-card {
  border-radius: 24px;
  overflow: hidden;
  background: #17171B;
  border: 1px solid rgba(255, 255, 255, 0.08);
  cursor: pointer;
  transform: translateY(0);
  transition: transform .45s ease, border-color .45s;
}

.track-media {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.track-img {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1);
  transition: transform .8s ease;
}

.track-img.track-img-hover {
  opacity: 0;
  transition: opacity .55s ease, transform .8s ease;
}

.track-card:hover {
  transform: translateY(-6px);
}

.track-card:hover .track-img {
  transform: scale(1.06);
}

.track-card:hover .track-img-hover {
  opacity: 1;
}

.track-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(8, 8, 10, 0.55);
  backdrop-filter: blur(8px);
  color: #FFFFFF;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 7px 14px;
  border-radius: 999px;
}

.track-body {
  padding: 28px;
}

.track-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #FFFFFF;
}

.track-desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.6);
}

.track-cta {
  margin-top: 18px;
  font-size: 14px;
  font-weight: 600;
  color: var(--gold-light);
}

/* ============ PLATFORM PREVIEW ============ */
.preview-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 72px;
  align-items: center;
}

.preview-desc {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.7;
  color: var(--gray);
}

.preview-points {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 32px;
}

.preview-point {
  display: flex;
  gap: 12px;
  align-items: baseline;
}

.preview-point-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  flex: none;
  transform: translateY(-2px);
}

.preview-point-text {
  font-size: 15px;
  line-height: 1.6;
  color: var(--gray-dark);
}

/* Mockup */
.mockup {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: 0 24px 60px rgba(17, 24, 39, 0.10);
  overflow: hidden;
}

.mockup-titlebar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  background: #FFFFFF;
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
}

.mockup-url {
  margin-left: 12px;
  font-size: 12px;
  color: #9CA3AF;
}

.mockup-body {
  display: grid;
  grid-template-columns: 150px 1fr 190px;
  min-height: 380px;
}

.mockup-sidebar {
  border-right: 1px solid var(--border);
  background: #FFFFFF;
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-item {
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 8px;
}

.sidebar-item.is-active {
  font-weight: 600;
  color: var(--ink);
  background: #F3F4F6;
}

.sidebar-item:not(.is-active) {
  font-weight: 400;
  color: var(--gray);
  background: transparent;
}

.mockup-main {
  padding: 24px 22px;
  background: #FFFFFF;
}

.mockup-project-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mockup-project-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.mockup-project-badge {
  font-size: 11px;
  font-weight: 600;
  color: var(--gray);
  background: #F3F4F6;
  padding: 4px 10px;
  border-radius: 999px;
}

.mockup-project-meta {
  font-size: 12.5px;
  color: #9CA3AF;
  margin-top: 4px;
}

.kpi-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 16px;
}

.kpi-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}

.kpi-label {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #9CA3AF;
}

.kpi-value-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-top: 6px;
}

.kpi-value {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.kpi-delta {
  font-size: 11px;
  font-weight: 600;
  color: #16A34A;
}

.chart-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-top: 12px;
}

.chart-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.chart-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9CA3AF;
}

.chart-sub {
  font-size: 11px;
  color: #9CA3AF;
}

.chart-svg {
  width: 100%;
  height: 80px;
  margin-top: 10px;
  display: block;
}

.stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 12px;
}

.stat-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
}

.donut-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 10px;
}

.donut-svg {
  width: 52px;
  height: 52px;
  flex: none;
}

.donut-legend {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 11px;
  color: var(--gray);
}

.donut-legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.legend-swatch {
  width: 7px;
  height: 7px;
  border-radius: 2px;
}

.keyword-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 10px;
}

.tag {
  font-size: 10.5px;
  font-weight: 600;
  padding: 4px 9px;
  border-radius: 999px;
}

.tag.tag-gold {
  color: var(--gold);
  background: rgba(176, 141, 87, 0.10);
}

.tag.tag-gray {
  color: var(--gray-dark);
  background: #F3F4F6;
}

.keyword-note {
  font-size: 11px;
  color: var(--gray);
  margin-top: 10px;
}

.keyword-note .up {
  font-weight: 700;
  color: #16A34A;
}

.collab-card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  margin-top: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.collab-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9CA3AF;
}

.collab-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}

.avatar-stack {
  display: flex;
}

.avatar {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid #fff;
}

.avatar + .avatar {
  margin-left: -7px;
}

.collab-count {
  font-size: 11.5px;
  color: var(--gray);
}

.mockup-side {
  border-left: 1px solid var(--border);
  background: #FBFBFC;
  padding: 20px 16px;
}

.side-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
}

.score-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 14px;
}

.score-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--gray-dark);
}

.score-bar-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 5px;
}

.score-bar-fill {
  height: 4px;
  background: var(--gold);
  border-radius: 2px;
}

.side-summary {
  border-top: 1px solid var(--border);
  margin-top: 16px;
  padding-top: 14px;
}

.side-summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--gray-dark);
}

.side-summary-row + .side-summary-row {
  margin-top: 8px;
}

.side-cta {
  background: #111111;
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  padding: 10px;
  border-radius: 10px;
  margin-top: 18px;
}

/* ============ HOW IT WORKS ============ */
.how-section {
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 140px 0;
}

.how-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 72px;
}

.step-card {
  background: #FFFFFF;
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 26px 22px;
  transition: border-color .3s;
}

.step-card:hover {
  border-color: var(--gold);
}

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

.step-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: rgba(176, 141, 87, 0.10);
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-icon svg {
  width: 20px;
  height: 20px;
}

.step-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.step-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin-top: 16px;
}

.step-desc {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--gray);
}

/* ============ WHY JOIN ============ */
.why-heading {
  max-width: 680px;
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 72px;
}

.benefit-card {
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 30px;
  transition: transform .35s ease, background .35s, box-shadow .35s;
}

.benefit-card:hover {
  background: var(--bg-soft);
  transform: scale(1.035);
  box-shadow: 0 16px 40px rgba(17, 24, 39, 0.08);
}

.benefit-num {
  font-size: 12px;
  font-weight: 600;
  color: var(--gold);
}

.benefit-title {
  font-size: 19px;
  font-weight: 600;
  color: var(--ink);
  margin-top: 12px;
}

.benefit-desc {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--gray);
}

/* ============ LAUNCH SOON ============ */
.launch-section {
  background: var(--dark-bg);
  padding: 150px 0;
  overflow: hidden;
}

.launch-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  text-align: center;
}

.launch-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid rgba(214, 181, 132, 0.35);
  color: var(--gold-light);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 9px 20px;
  border-radius: 999px;
}

.launch-badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-light);
}

.launch-heading {
  margin: 32px auto 0;
  font-size: 58px;
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  max-width: 760px;
  text-wrap: balance;
}

.launch-desc {
  margin: 24px auto 0;
  font-size: 17px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.6);
  max-width: 520px;
}

.launch-chips {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 44px;
  flex-wrap: wrap;
}

.launch-chip {
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(255, 255, 255, 0.75);
  font-size: 13.5px;
  font-weight: 500;
  padding: 11px 22px;
  border-radius: 999px;
}

/* ============ FOOTER ============ */
.site-footer {
  background: var(--hero-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 64px 0 48px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo {
  height: 21px;
  display: block;
}

.footer-tag {
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  line-height: 1;
  align-self: center;
  transform: translateY(2.5px);
}

.footer-desc {
  margin: 14px 0 0;
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.45);
  max-width: 420px;
}

.footer-address {
  margin: 20px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.35);
}

.footer-copy {
  margin: 20px 0 0;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.3);
}

.footer-links {
  display: flex;
  gap: 56px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
}

.footer-link {
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.65);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .header-nav {
    gap: 18px;
  }
  .nav-link {
    display: none;
  }
  .hero-title {
    font-size: 52px;
  }
  .heading {
    font-size: 36px;
  }
  .about-grid,
  .preview-grid {
    grid-template-columns: 1fr;
  }
  .about-cards,
  .tracks-grid,
  .benefits-grid {
    grid-template-columns: 1fr;
  }
  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .mockup-body {
    grid-template-columns: 1fr;
  }
  .mockup-sidebar,
  .mockup-side {
    display: none;
  }
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .launch-heading {
    font-size: 38px;
  }
}