/* FLAP｜逆蝶 — Azuki-inspired cinematic site */
:root {
  --bg: #0a0908;
  --bg-elevated: #12100e;
  --bg-card: #161310;
  --ink: #f2ebe0;
  --ink-muted: #a89888;
  --ink-dim: #6b5e52;
  --gold: #c9a66b;
  --gold-bright: #e8c98a;
  --gold-dim: #8a6f3e;
  --purple: #8b5cf6;
  --purple-neon: #a78bfa;
  --purple-glow: rgba(139, 92, 246, 0.35);
  --gold-glow: rgba(201, 166, 107, 0.25);
  --overlay: rgba(8, 6, 5, 0.62);
  --overlay-heavy: rgba(6, 4, 3, 0.78);
  --border: rgba(201, 166, 107, 0.18);
  --border-hover: rgba(167, 139, 250, 0.45);
  --font-display: "Cormorant Garamond", "Noto Serif SC", "Songti SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Helvetica Neue", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 1180px;
}

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

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

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

/* —— Nav —— */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2.5rem;
  transition: background 0.4s var(--ease), backdrop-filter 0.4s var(--ease), border-color 0.4s;
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(10, 9, 8, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-brand img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
}

.nav-brand span {
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  transition: color 0.3s;
}

.nav-links a:hover { color: var(--gold-bright); }

.nav-x {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem !important;
  letter-spacing: 0.08em !important;
  text-transform: none !important;
  color: var(--gold) !important;
}

.nav-x:hover { color: var(--gold-bright) !important; }

.nav-x svg { width: 16px; height: 16px; fill: currentColor; }

/* —— Language toggle —— */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.lang-btn {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-dim);
  padding: 0.2rem 0.15rem;
  transition: color 0.25s;
  line-height: 1;
}

.lang-btn:hover { color: var(--gold-bright); }

.lang-btn.is-active {
  color: var(--gold);
  font-weight: 600;
}

.lang-sep {
  color: var(--ink-dim);
  font-size: 0.7rem;
  opacity: 0.5;
  user-select: none;
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.02);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--overlay-heavy) 0%, var(--overlay) 45%, rgba(8,6,5,0.35) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 2.5rem 6.5rem;
}

.hero-eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 1.25rem;
  opacity: 0;
  animation: fade-up 1s var(--ease) 0.2s forwards;
}


  font-weight: 600;
  line-height: 1.08;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin-bottom: 1rem;
  opacity: 0;
  animation: fade-up 1s var(--ease) 0.35s forwards;
}

.hero-title .pipe {
  color: var(--purple-neon);
  font-weight: 400;
  margin: 0 0.15em;
  opacity: 0.85;
}

.hero-hook {
  font-family: var(--font-display);
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--ink-muted);
  margin-bottom: 2.75rem;
  opacity: 0;
  animation: fade-up 1s var(--ease) 0.5s forwards;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fade-up 1s var(--ease) 0.65s forwards;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.95rem 2.1rem;
  background: linear-gradient(135deg, var(--gold) 0%, var(--gold-dim) 100%);
  color: #0a0908;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  border-radius: 2px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), filter 0.35s;
  box-shadow: 0 0 0 0 var(--gold-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.08);
  box-shadow: 0 8px 32px var(--gold-glow);
}

.btn-primary svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
}

.btn-ghost {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  transition: color 0.3s;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.btn-ghost:hover {
  color: var(--purple-neon);
  border-bottom-color: var(--purple-neon);
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-dim);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0;
  animation: fade-up 1s var(--ease) 1.2s forwards;
}

.hero-scroll-line {
  width: 1px;
  height: 36px;
  background: linear-gradient(to bottom, var(--gold), transparent);
  animation: scroll-pulse 2s ease-in-out infinite;
}

@keyframes scroll-pulse {
  0%, 100% { opacity: 0.3; transform: scaleY(0.7); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(0); }
}

/* —— Sections common —— */
.section {
  position: relative;
  padding: 7rem 2.5rem;
}

.section-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--purple-neon);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink);
}

.section-rule {
  width: 48px;
  height: 1px;
  background: linear-gradient(to right, var(--gold), transparent);
  margin-top: 1.25rem;
}

/* —— Explore —— */
#explore {
  background: var(--bg);
}

.episode-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}

.ep-card {
  position: relative;
  display: block;
  aspect-ratio: 3 / 4;
  border-radius: 4px;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border);
  transition: transform 0.45s var(--ease), border-color 0.45s, box-shadow 0.45s;
}

.ep-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: 0 20px 48px rgba(0,0,0,0.5), 0 0 40px var(--purple-glow);
}

.ep-card-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.7s var(--ease), filter 0.7s;
}

.ep-card:hover .ep-card-bg {
  transform: scale(1.08);
  filter: brightness(1.1);
}

.ep-card:nth-child(1) .ep-card-bg {
  background-image:
    linear-gradient(160deg, rgba(8,6,5,0.45) 0%, rgba(139,92,246,0.22) 100%),
    url("assets/ep_e1_cover.jpg");
  background-position: center;
  background-size: cover;
}

.ep-card:nth-child(2) .ep-card-bg {
  background-image:
    linear-gradient(160deg, rgba(8,6,5,0.5) 0%, rgba(201,166,107,0.28) 100%),
    url("assets/ep_e2_cover.jpg");
  background-position: center top;
  background-size: cover;
}

.ep-card:nth-child(3) .ep-card-bg {
  background-image:
    linear-gradient(160deg, rgba(8,6,5,0.5) 0%, rgba(90,40,120,0.35) 100%),
    url("assets/ep_e3_cover.jpg");
  background-position: center top;
  background-size: cover;
}

.ep-card:nth-child(4) .ep-card-bg {
  background-image:
    linear-gradient(160deg, rgba(8,6,5,0.45) 0%, rgba(180,60,80,0.32) 100%),
    url("assets/ep_e4_cover.jpg");
  background-position: center top;
  background-size: cover;
}

.ep-card:nth-child(2):hover .ep-card-bg,
.ep-card:nth-child(3):hover .ep-card-bg,
.ep-card:nth-child(4):hover .ep-card-bg {
  filter: brightness(1.08);
}

.ep-card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(8,6,5,0.92) 0%, rgba(8,6,5,0.2) 55%, transparent 100%);
}

.ep-card-body {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 1.5rem 1.35rem;
  z-index: 2;
}

.ep-num {
  font-size: 0.68rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 0.4rem;
}

.ep-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  margin-bottom: 0.35rem;
}

.ep-sub {
  font-size: 0.75rem;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
}

/* —— Episode cards as buttons —— */
button.ep-card {
  width: 100%;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  padding: 0;
}

.ep-play {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 3;
  transform: translate(-50%, -58%);
  color: var(--gold-bright);
  opacity: 0.92;
  transition: transform 0.35s var(--ease), opacity 0.35s, color 0.35s;
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.55));
  pointer-events: none;
}

.ep-card--playable:hover .ep-play {
  transform: translate(-50%, -58%) scale(1.08);
  color: var(--ink);
  opacity: 1;
}

.ep-card--soon {
  opacity: 0.55;
  cursor: default;
}

.ep-card--soon:hover {
  transform: translateY(-3px);
  border-color: var(--border);
  box-shadow: 0 12px 28px rgba(0,0,0,0.35);
}

.ep-card--soon .ep-card-bg {
  filter: grayscale(0.35) brightness(0.7) !important;
}

.ep-card--soon:hover .ep-card-bg {
  transform: scale(1.03);
  filter: grayscale(0.25) brightness(0.75) !important;
}

.ep-soon-badge {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  z-index: 3;
  padding: 0.28rem 0.55rem;
  font-size: 0.62rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  background: rgba(10, 9, 8, 0.72);
  border: 1px solid var(--border);
  border-radius: 2px;
  pointer-events: none;
}

.ep-soon-badge::before {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 0.7em;
  margin-right: 0.35em;
  vertical-align: -0.05em;
  background: currentColor;
  clip-path: polygon(15% 0%, 85% 0%, 85% 55%, 100% 55%, 50% 100%, 0% 55%, 15% 55%);
  opacity: 0.85;
}

/* —— Video modal —— */
body.modal-open {
  overflow: hidden;
}

.video-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.video-modal[hidden] {
  display: none !important;
}

.video-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(4, 3, 2, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
}

.video-modal-dialog {
  position: relative;
  z-index: 1;
  width: min(960px, 100%);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.65), 0 0 60px var(--gold-glow);
  overflow: hidden;
}

.video-modal-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 9, 8, 0.6);
}

.video-modal-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.video-modal-close {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: var(--ink-muted);
  border-radius: 2px;
  transition: color 0.25s, background 0.25s;
}

.video-modal-close:hover {
  color: var(--gold-bright);
  background: rgba(201, 166, 107, 0.1);
}

.video-modal-frame {
  position: relative;
  background: #000;
  aspect-ratio: 16 / 9;
}

.video-modal-frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

/* —— Toast —— */
.toast {
  position: fixed;
  left: 50%;
  bottom: 2.25rem;
  z-index: 220;
  transform: translateX(-50%) translateY(12px);
  padding: 0.75rem 1.35rem;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-bright);
  background: rgba(18, 16, 14, 0.94);
  border: 1px solid var(--border);
  border-radius: 2px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease);
}

.toast.is-visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

@media (max-width: 640px) {
  .ep-play svg { width: 48px; height: 48px; }
  .video-modal { padding: 0.75rem; }
  .video-modal-title { font-size: 0.8rem; }
  .toast { bottom: 1.25rem; font-size: 0.72rem; }
}

/* —— Characters —— */
#characters {
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(139,92,246,0.08) 0%, transparent 70%),
    var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.char-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  max-width: 960px;
}

.char-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: border-color 0.35s, transform 0.35s var(--ease), box-shadow 0.35s;
}

.char-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.4);
}

.char-avatar {
  object-position: center center;
  width: 88px;
  height: 88px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--border);
  flex-shrink: 0;
  transition: border-color 0.35s;
}

.char-card:hover .char-avatar {
  border-color: var(--purple-neon);
}

.char-meta { flex: 1; min-width: 0; }

.char-name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

.char-role {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

@media (max-width: 900px) {
  .char-strip { grid-template-columns: repeat(2, 1fr); }
}

.char-arrow {
  color: var(--ink-dim);
  transition: color 0.3s, transform 0.3s;
}

.char-card:hover .char-arrow {
  color: var(--gold);
  transform: translateX(4px);
}

/* —— Footer —— */
.footer {
  padding: 3.5rem 2.5rem;
  text-align: center;
  background: var(--bg);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.15em;
  color: var(--ink-muted);
}

.footer-brand .pipe { color: var(--purple-neon); opacity: 0.7; }

.footer-x {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  color: var(--gold);
  letter-spacing: 0.06em;
  transition: color 0.3s;
}

.footer-x:hover { color: var(--gold-bright); }

.footer-x svg { width: 16px; height: 16px; fill: currentColor; }

.footer-copy {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
  margin-top: 0.5rem;
}

.footer-mark {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
  opacity: 0.7;
  border: 1px solid var(--border);
}

/* —— Responsive —— */
@media (max-width: 960px) {
  .episode-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}

@media (max-width: 640px) {
  .nav { padding: 1rem 1.25rem; }
  .nav-links { gap: 1.25rem; }
  .nav-links .nav-hide { display: none; }

  .hero-content { padding: 0 1.25rem 5.5rem; }

  .section { padding: 4.5rem 1.25rem; }

  .episode-grid {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }

  .ep-card { aspect-ratio: 2 / 3; }
  .ep-title { font-size: 1.05rem; }
  .ep-card-body { padding: 1rem 0.9rem; }

  .char-strip {
    grid-template-columns: 1fr;
    max-width: none;
  }

  .char-avatar { width: 72px; height: 72px; }

  .hero-actions { gap: 1.25rem; }
}

@media (max-width: 400px) {
  .episode-grid { grid-template-columns: 1fr; }
  .ep-card { aspect-ratio: 16 / 10; }
}


/* —— Typography polish —— */
.hero-title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: clamp(3.2rem, 8vw, 5.6rem);
  line-height: 1.05;
}
.hero-hook {
  font-family: var(--font-display);
  font-weight: 500;
  font-style: italic;
  letter-spacing: 0.06em;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
}
.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.06em;
}
.ep-title, .char-name, .nav-brand span, .footer-brand {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.1em;
}
.hero-eyebrow, .section-label, .ep-num, .ep-sub, .char-role {
  letter-spacing: 0.22em;
}


/* —— BGM toggle —— */
.bgm-toggle {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 90;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(18, 16, 14, 0.88);
  border: 1px solid var(--border);
  color: var(--gold);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(139, 92, 246, 0.08);
  transition: color 0.3s, border-color 0.3s, box-shadow 0.3s, transform 0.3s var(--ease), background 0.3s;
}
.bgm-toggle:hover {
  color: var(--gold-bright);
  border-color: var(--border-hover);
  box-shadow: 0 10px 32px rgba(0, 0, 0, 0.5), 0 0 18px var(--purple-glow);
  transform: translateY(-1px);
}
.bgm-toggle:focus-visible {
  outline: 1px solid var(--purple-neon);
  outline-offset: 3px;
}
.bgm-toggle-icon { display: none; line-height: 0; }
.bgm-toggle.is-on .bgm-toggle-icon--on { display: block; }
.bgm-toggle.is-off .bgm-toggle-icon--off { display: block; }
.bgm-toggle.is-on {
  color: var(--purple-neon);
  border-color: rgba(167, 139, 250, 0.4);
}
@media (max-width: 640px) {
  .bgm-toggle {
    right: 1rem;
    bottom: 1rem;
    width: 44px;
    height: 44px;
  }
}