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

:root {
  --bg: #f5f1eb;
  --fg: #1a1917;
  --muted: #8a8378;
  --rule: #d5cdc0;
  --serif: 'Instrument Serif', serif;
  --sans: 'Hanken Grotesk', sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

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

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; color: inherit; }

/* ── Monospace Label ── */
.label {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── Layout ── */
.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ── Header ── */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px 28px;
  max-width: 820px;
  margin: 0 auto;
}

.logo {
  font-family: var(--serif);
  font-style: italic;
  font-size: 22px;
  color: var(--fg);
}

.site-nav {
  display: flex;
  gap: 28px;
  list-style: none;
}

.site-nav a {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
  position: relative;
  transition: color 0.3s var(--ease);
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--fg);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.site-nav a:hover { color: var(--fg); }
.site-nav a:hover::after { transform: scaleX(1); }
.site-nav a.active { color: var(--fg); }

/* ── Drawn Line ── */
.drawn-line {
  height: 1px;
  background: var(--rule);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.7s var(--ease);
}
.drawn-line.visible { transform: scaleX(1); }

.line-static {
  height: 1px;
  background: var(--rule);
}

/* ── Hero ── */
.hero {
  padding: 80px 0 48px;
  position: relative;
}

.hero .label { margin-bottom: 20px; }

.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1.2;
  max-width: 600px;
  margin-bottom: 16px;
}

.hero p.subtitle {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 300;
  color: var(--muted);
  max-width: 480px;
  line-height: 1.7;
}

.coordinate {
  position: absolute;
  top: 80px;
  right: 0;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--rule);
  will-change: transform;
}

/* ── Fade Up ── */
.fade-up {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-up.delay-1 { transition-delay: 0.1s; }
.fade-up.delay-2 { transition-delay: 0.2s; }
.fade-up.delay-3 { transition-delay: 0.3s; }
.fade-up.delay-4 { transition-delay: 0.4s; }

/* ── Song List ── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 0 24px;
}

.section-header .count {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--muted);
}

.song-list { list-style: none; }

.song-row {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  align-items: center;
  gap: 0 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  transform: translateX(0);
  transition: transform 0.3s var(--ease);
}

.song-row:first-child { border-top: 1px solid var(--rule); }

.song-row:hover { transform: translateX(12px); }

.song-index {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 300;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

.song-row:hover .song-index { color: var(--fg); }

.song-info h3 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 22px;
  line-height: 1.3;
  margin-bottom: 4px;
}

.song-info p {
  font-size: 14px;
  font-weight: 300;
  color: var(--muted);
  line-height: 1.5;
}

.song-date {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--muted);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  white-space: nowrap;
}

.song-row:hover .song-date { opacity: 1; }

/* ── Song Page ── */
.song-header {
  padding: 80px 0 32px;
}

.song-header .label { margin-bottom: 16px; }

.song-header h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1.15;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.song-header .description {
  font-size: 16px;
  font-weight: 300;
  color: var(--muted);
  line-height: 1.7;
  max-width: 560px;
}

/* ── Audio Player ── */
.player-wrapper {
  padding: 32px 0;
}

.player-box {
  border: 1px solid var(--rule);
  padding: 24px;
}

.player-box audio {
  width: 100%;
  height: 40px;
  outline: none;
}

.player-meta {
  display: flex;
  gap: 24px;
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--muted);
  text-transform: uppercase;
}

/* ── Download Link ── */
.download-link {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--fg);
  position: relative;
  padding-bottom: 3px;
  margin: 8px 0 0;
}

.download-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--fg);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

.download-link:hover::after { transform: scaleX(1); }

/* ── Waveform Indicator ── */
.waveform {
  display: none;
  align-items: flex-end;
  gap: 2px;
  height: 16px;
}

.waveform.active { display: inline-flex; }

.waveform span {
  width: 2px;
  background: var(--fg);
  animation: wave 0.8s ease-in-out infinite;
}

.waveform span:nth-child(1) { height: 6px; animation-delay: 0s; }
.waveform span:nth-child(2) { height: 12px; animation-delay: 0.15s; }
.waveform span:nth-child(3) { height: 8px; animation-delay: 0.3s; }
.waveform span:nth-child(4) { height: 14px; animation-delay: 0.1s; }

@keyframes wave {
  0%, 100% { transform: scaleY(0.4); }
  50% { transform: scaleY(1); }
}

/* ── Feedback Section ── */
.feedback-section {
  padding: 40px 0;
}

.feedback-section .label { margin-bottom: 24px; }

.feedback-form {
  margin-bottom: 40px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  background: transparent;
  border: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 300;
  color: var(--fg);
  outline: none;
  transition: border-color 0.3s var(--ease);
  border-radius: 0;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--fg);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.form-group label {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}

.submit-btn {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--rule);
  padding: 12px 28px;
  cursor: pointer;
  transition: border-color 0.3s var(--ease);
}

.submit-btn:hover { border-color: var(--fg); }
.submit-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.form-status {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--muted);
  margin-top: 12px;
  min-height: 20px;
}

/* ── Feedback List ── */
.feedback-list { list-style: none; }

.feedback-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
}

.feedback-item:first-child { border-top: 1px solid var(--rule); }

.feedback-name {
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 6px;
}

.feedback-message {
  font-size: 14px;
  font-weight: 300;
  line-height: 1.7;
  color: var(--muted);
  margin-bottom: 8px;
}

.feedback-meta {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--rule);
}

/* ── About Page ── */
.about-content {
  padding: 80px 0 40px;
}

.about-content .label { margin-bottom: 28px; }

.about-text {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.7;
  max-width: 600px;
  margin-bottom: 48px;
}

.detail-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 24px 0;
}

.detail-item .detail-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}

.detail-item .detail-value {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
}

.detail-item .detail-value a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.3s var(--ease);
}

.detail-item .detail-value a:hover {
  text-decoration-color: var(--fg);
}

/* ── Footer ── */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 40px 28px;
  max-width: 820px;
  margin: 0 auto;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--muted);
}

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: 80px 0;
}

.empty-state p {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 300;
  color: var(--muted);
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .site-header { padding: 24px 20px; }
  .container { padding: 0 20px; }
  .site-nav { gap: 18px; }
  .site-nav a { font-size: 9px; letter-spacing: 1.5px; }
  .hero { padding: 52px 0 36px; }
  .coordinate { display: none; }
  .song-row { grid-template-columns: 36px 1fr; gap: 0 12px; padding: 18px 0; }
  .song-date { display: none; }
  .song-info h3 { font-size: 18px; }
  .detail-strip { grid-template-columns: repeat(2, 1fr); gap: 20px 0; }
  .site-footer { padding: 32px 20px; flex-direction: column; gap: 8px; text-align: center; }
  .player-meta { flex-wrap: wrap; gap: 12px; }
  .song-header h1 { font-size: 28px; }
}

@media (max-width: 380px) {
  .site-nav { gap: 12px; }
  .logo { font-size: 18px; }
}