/* ========================================
   飞鸟官网 — Skyborne Fantasy
   ======================================== */

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

:root {
  /* 天空色系 */
  --sky-deep:   #060d1f;
  --sky-dark:   #0c1a36;
  --sky-mid:    #163050;
  --sky-blue:   #3a7bd5;
  --sky-light:  #6db3f0;
  --sky-pale:   #a8d8ff;

  /* 日光金色 */
  --gold:       #f0a93b;
  --gold-bright:#ffd56b;
  --gold-deep:  #c47e1e;
  --gold-glow:  rgba(240, 169, 59, 0.45);

  /* 珊瑚红 */
  --coral:      #ff6b6b;
  --coral-deep: #e54b4b;

  /* 绿色 */
  --leaf:       #4ecdc4;

  /* 玻璃 */
  --glass:      rgba(255, 255, 255, 0.06);
  --glass-hover:rgba(255, 255, 255, 0.1);
  --glass-brd:  rgba(255, 255, 255, 0.12);
  --gold-brd:   rgba(240, 169, 59, 0.3);

  /* 文字 */
  --text:       #f0f4ff;
  --text-dim:   rgba(240, 244, 255, 0.7);
  --text-mute:  rgba(240, 244, 255, 0.45);

  /* 字体 */
  --f-display:  'ZCOOL KuaiLe', 'Noto Sans SC', sans-serif;
  --f-body:     'Noto Sans SC', 'Quicksand', sans-serif;
  --f-deco:     'Cinzel', serif;

  /* 尺寸 */
  --maxw:       1140px;
}

html { scroll-behavior: smooth; font-size: 16px; scroll-padding-top: 90px; }

body {
  font-family: var(--f-body);
  color: var(--text);
  background: var(--sky-deep);
  overflow-x: hidden;
  min-height: 100vh;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ===== 背景层 ===== */
.sky-gradient {
  position: fixed; inset: 0; z-index: -5;
  background: linear-gradient(180deg,
    var(--sky-deep) 0%,
    var(--sky-dark) 15%,
    var(--sky-mid) 38%,
    #1e4a6e 58%,
    #2a6a8e 72%,
    #4a8aad 82%,
    var(--gold-deep) 92%,
    var(--gold) 100%);
}

.bg-image {
  position: fixed; inset: 0; z-index: -4;
  background: url('img/bg.png') center / cover no-repeat;
  opacity: 0.28;
  filter: blur(1px) saturate(1.15);
}

.vignette {
  position: fixed; inset: 0; z-index: -3; pointer-events: none;
  background: radial-gradient(ellipse at 50% 30%, transparent 0%, rgba(6,13,31,0.5) 80%, rgba(6,13,31,0.85) 100%);
}

.noise {
  position: fixed; inset: 0; z-index: -2; pointer-events: none; opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ===== 粒子 Canvas ===== */
.particles {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
}

/* ===== 飞鸟层 ===== */
.birds-layer { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }

.bird {
  position: absolute;
  width: 34px; height: 18px;
  color: rgba(255,255,255,0.5);
  animation: birdFly linear infinite;
}
.bird svg { width: 100%; height: 100%; }
.bird svg path { animation: wingFlap 0.5s ease-in-out infinite alternate; transform-origin: center; }

@keyframes birdFly {
  0%   { transform: translateX(-60px) translateY(0); }
  50%  { transform: translateX(50vw) translateY(-20px); }
  100% { transform: translateX(calc(100vw + 60px)) translateY(0); }
}
@keyframes wingFlap {
  0%   { transform: scaleY(1); }
  100% { transform: scaleY(0.5); }
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background 0.4s ease, backdrop-filter 0.4s ease, box-shadow 0.4s ease;
}
.navbar.scrolled {
  background: rgba(6, 13, 31, 0.82);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--glass-brd);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2rem;
}
.nav-brand {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--f-display); font-size: 1.5rem;
  color: var(--text);
}
.nav-logo { width: 36px; height: 36px; object-fit: contain; filter: drop-shadow(0 0 8px var(--gold-glow)); }

.nav-links { display: flex; gap: 0.5rem; }
.nav-link {
  padding: 0.5rem 1.2rem; border-radius: 100px;
  font-size: 0.95rem; font-weight: 500;
  color: var(--text-dim);
  transition: all 0.3s ease;
  position: relative;
}
.nav-link::after {
  content: ''; position: absolute; bottom: 4px; left: 50%; transform: translateX(-50%);
  width: 0; height: 2px; background: var(--gold); border-radius: 2px;
  transition: width 0.3s ease;
}
.nav-link:hover { color: var(--gold-bright); }
.nav-link:hover::after { width: 50%; }
.nav-link.active { color: var(--gold-bright); }
.nav-link.active::after { width: 50%; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: all 0.3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center;
  position: relative; z-index: 1;
  padding: 6rem 1.5rem 3rem;
}

.hero-logo-wrap {
  position: relative; margin-bottom: 8rem;
}
.hero-logo {
  width: clamp(180px, 28vw, 300px);
  filter: drop-shadow(0 8px 48px var(--gold-glow)) drop-shadow(0 0 100px rgba(109,179,240,0.3));
  animation: floatBob 4s ease-in-out infinite;
  position: relative; z-index: 2;
}
.logo-ring {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
  width: clamp(240px, 36vw, 380px); height: clamp(240px, 36vw, 380px);
  border: 2px solid var(--gold-brd); border-radius: 50%;
  animation: ringPulse 3s ease-in-out infinite;
}
.logo-ring::before {
  content: ''; position: absolute; inset: -24px;
  border: 1px dashed rgba(240,169,59,0.2); border-radius: 50%;
  animation: ringSpin 18s linear infinite;
}

@keyframes floatBob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
@keyframes ringPulse {
  0%, 100% { opacity: 0.4; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.9; transform: translate(-50%, -50%) scale(1.06); }
}
@keyframes ringSpin { to { transform: rotate(360deg); } }

.hero-title {
  font-family: var(--f-display);
  font-size: clamp(3.5rem, 10vw, 6.5rem);
  line-height: 1;
  letter-spacing: 0.05em;
  background: linear-gradient(180deg, #fff 0%, var(--gold-bright) 45%, var(--gold) 100%);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 20px var(--gold-glow));
  margin-bottom: 1rem;
}

.hero-subtitle {
  display: flex; align-items: center; gap: 1.2rem;
  margin-bottom: 0.8rem;
}
.hero-subtitle p {
  font-size: clamp(0.95rem, 2.2vw, 1.25rem);
  font-weight: 300; letter-spacing: 0.1em;
  color: var(--sky-pale);
  white-space: nowrap;
}
.sub-line {
  display: block; width: clamp(30px, 8vw, 60px); height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.hero-desc {
  font-family: var(--f-deco);
  font-size: clamp(0.8rem, 1.8vw, 1rem);
  color: var(--text-mute); letter-spacing: 0.15em;
  margin-bottom: 2.5rem;
}

.hero-cta-group {
  display: flex; align-items: center; justify-content: center; gap: 1rem; flex-wrap: wrap;
}

.hero-cta {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.85rem 2.6rem;
  font-family: var(--f-body); font-size: 1.05rem; font-weight: 500;
  color: var(--sky-deep);
  background: linear-gradient(135deg, var(--gold-bright), var(--gold));
  border-radius: 100px;
  box-shadow: 0 4px 20px var(--gold-glow), 0 0 0 0 var(--gold-glow);
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative; overflow: hidden;
}
.hero-cta-alt {
  background: var(--glass);
  backdrop-filter: blur(10px);
  color: var(--text);
  border: 1px solid var(--glass-brd);
  box-shadow: none;
}
.hero-cta-alt::before {
  background: linear-gradient(135deg, var(--glass-hover), rgba(255,255,255,0.04));
}
.hero-cta svg { width: 18px; height: 18px; transition: transform 0.3s; }
.hero-cta::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, #fff, var(--gold-bright));
  opacity: 0; transition: opacity 0.3s;
}
.hero-cta span, .hero-cta svg { position: relative; z-index: 1; }
.hero-cta:hover { transform: translateY(-3px); box-shadow: 0 8px 30px var(--gold-glow); }
.hero-cta-alt:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.3); border-color: var(--gold-brd); color: var(--sky-deep); }
.hero-cta:hover::before { opacity: 1; }
.hero-cta:hover svg { transform: translateY(3px); }
.hero-cta-alt:hover svg { transform: scale(1.1); }

/* 滚动提示 */
.scroll-hint {
  position: absolute; bottom: 2rem; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  color: var(--text-mute); font-size: 0.8rem; letter-spacing: 0.1em;
}
.scroll-mouse {
  width: 24px; height: 40px; border: 2px solid var(--text-mute); border-radius: 12px;
  display: flex; justify-content: center; padding-top: 6px;
}
.scroll-dot { width: 4px; height: 8px; background: var(--gold-bright); border-radius: 2px; animation: scrollDot 1.5s ease-in-out infinite; }
@keyframes scrollDot { 0% { opacity: 0; transform: translateY(-4px); } 50% { opacity: 1; } 100% { opacity: 0; transform: translateY(10px); } }

/* ===== Section 通用 ===== */
.section {
  max-width: var(--maxw); margin: 0 auto;
  padding: 5rem 2rem;
  position: relative; z-index: 1;
  text-align: center;
}

.section-header {
  display: flex; align-items: center; justify-content: center; gap: 1.5rem;
  margin-bottom: 0.5rem;
}
.header-deco-left, .header-deco-right {
  width: clamp(30px, 10vw, 80px); height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold));
}
.header-deco-right { background: linear-gradient(90deg, var(--gold), transparent); }

.section-title {
  font-family: var(--f-display); font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: 0.08em;
  background: linear-gradient(180deg, #fff, var(--gold-bright));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 12px var(--gold-glow));
}
.section-subtitle {
  font-size: 0.95rem; color: var(--text-mute); letter-spacing: 0.1em;
  margin-bottom: 3rem; font-weight: 300;
}

/* ===== 公告板 ===== */
.board {
  position: relative;
  max-width: 760px; margin: 0 auto;
  background: var(--glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--glass-brd);
  border-radius: 20px;
  padding: 2.5rem;
  box-shadow: 0 8px 40px rgba(0,0,0,0.25), inset 0 1px 0 rgba(255,255,255,0.05);
}
.board::before {
  content: ''; position: absolute; inset: 0; border-radius: 20px; pointer-events: none;
  background: linear-gradient(135deg, var(--gold-brd), transparent 30%, transparent 70%, var(--gold-brd));
  -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  -webkit-mask-composite: xor; mask-composite: exclude; padding: 1px;
}

.board-pin {
  position: absolute; top: -10px; width: 16px; height: 16px;
  background: radial-gradient(circle at 35% 35%, var(--coral), var(--coral-deep));
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4), inset -2px -2px 4px rgba(0,0,0,0.3);
}
.board-pin-l { left: 32px; }
.board-pin-r { right: 32px; }

.board-list { display: flex; flex-direction: column; gap: 0.6rem; }

.board-item {
  text-align: left;
  padding: 1.2rem 1.5rem;
  border-radius: 14px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  transition: all 0.35s ease;
  cursor: default;
  position: relative; overflow: hidden;
}
.board-item::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--gold); opacity: 0; transition: opacity 0.3s;
}
.board-item:hover {
  background: var(--glass-hover);
  border-color: var(--gold-brd);
  transform: translateX(6px);
}
.board-item:hover::before { opacity: 1; }

.board-item-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 0.5rem;
}
.board-badge {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.05em;
  padding: 0.18rem 0.7rem; border-radius: 100px;
}
.badge-gold  { background: rgba(240,169,59,0.15); color: var(--gold-bright); border: 1px solid var(--gold-brd); }
.badge-blue  { background: rgba(58,123,213,0.15); color: var(--sky-light); border: 1px solid rgba(58,123,213,0.3); }
.badge-coral { background: rgba(255,107,107,0.15); color: var(--coral); border: 1px solid rgba(255,107,107,0.3); }
.badge-green { background: rgba(78,205,196,0.15); color: var(--leaf); border: 1px solid rgba(78,205,196,0.3); }

.board-item-header time { font-size: 0.82rem; color: var(--text-mute); font-family: var(--f-deco); }

.board-item h3 {
  font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; color: var(--text);
}
.board-item p { font-size: 0.9rem; color: var(--text-dim); line-height: 1.65; }
.board-item a { color: var(--gold-bright); text-decoration: none; transition: color 0.3s; }
.board-item a:hover { color: var(--gold); text-decoration: underline; }

/* ===== 下载专区 ===== */
.download-cards {
  display: flex; justify-content: center;
  max-width: 800px; margin: 0 auto;
}
.download-cards .download-card { max-width: 360px; width: 100%; }

.download-card {
  position: relative;
  display: flex; flex-direction: column; align-items: center;
  padding: 2.8rem 2rem 2.2rem;
  background: var(--glass);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-brd);
  border-radius: 24px;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
  text-align: center;
}
.download-card::before {
  content: ''; position: absolute; inset: 0; border-radius: 24px; pointer-events: none;
  background: linear-gradient(135deg, var(--gold-brd), transparent 30%, transparent 70%, var(--gold-brd));
  -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  -webkit-mask-composite: xor; mask-composite: exclude; padding: 1px;
}
.card-glow {
  position: absolute; top: -40%; left: 50%; transform: translateX(-50%);
  width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, var(--gold-glow), transparent 70%);
  opacity: 0; transition: opacity 0.4s; pointer-events: none;
}
.download-card-alt .card-glow { background: radial-gradient(circle, rgba(58,123,213,0.35), transparent 70%); }

.download-card:hover { transform: translateY(-8px); border-color: var(--gold-brd); }
.download-card:hover .card-glow { opacity: 1; }

.card-icon {
  width: 64px; height: 64px; display: flex; align-items: center; justify-content: center;
  border-radius: 18px; margin-bottom: 1.2rem;
  background: linear-gradient(135deg, rgba(240,169,59,0.15), rgba(240,169,59,0.05));
  border: 1px solid var(--gold-brd);
  color: var(--gold-bright);
  transition: all 0.4s;
}
.download-card-alt .card-icon {
  background: linear-gradient(135deg, rgba(58,123,213,0.15), rgba(58,123,213,0.05));
  border-color: rgba(58,123,213,0.3); color: var(--sky-light);
}
.card-icon svg { width: 30px; height: 30px; }
.download-card:hover .card-icon { transform: scale(1.1) rotate(-5deg); }

.download-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 0.5rem; }
.download-card > p { font-size: 0.88rem; color: var(--text-dim); margin-bottom: 1.5rem; }

.download-btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.8rem; border-radius: 100px;
  font-size: 0.95rem; font-weight: 500;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: var(--sky-deep);
  transition: all 0.3s;
  box-shadow: 0 4px 16px var(--gold-glow);
}
.download-card-alt .download-btn {
  background: linear-gradient(135deg, var(--sky-blue), #2a5d9e);
  color: #fff;
  box-shadow: 0 4px 16px rgba(58,123,213,0.35);
}
.download-btn svg { width: 16px; height: 16px; transition: transform 0.3s; }
.download-card:hover .download-btn svg { transform: translateX(4px); }

.download-note { margin-top: 2.5rem; }
.download-note p {
  font-size: 0.85rem; color: var(--text-mute); letter-spacing: 0.03em;
}

/* ===== 打赏专区 ===== */
.reward-card {
  position: relative;
  display: flex; flex-direction: column; align-items: center;
  max-width: 420px; margin: 0 auto;
  padding: 2.8rem 2rem 2.2rem;
  background: var(--glass);
  backdrop-filter: blur(14px);
  border: 1px solid var(--glass-brd);
  border-radius: 24px;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
  text-align: center;
}
.reward-card::before {
  content: ''; position: absolute; inset: 0; border-radius: 24px; pointer-events: none;
  background: linear-gradient(135deg, var(--gold-brd), transparent 30%, transparent 70%, var(--gold-brd));
  -webkit-mask: linear-gradient(#000, #000) content-box, linear-gradient(#000, #000);
  -webkit-mask-composite: xor; mask-composite: exclude; padding: 1px;
}
.reward-card .card-glow {
  position: absolute; top: -40%; left: 50%; transform: translateX(-50%);
  width: 220px; height: 220px; border-radius: 50%;
  background: radial-gradient(circle, var(--gold-glow), transparent 70%);
  opacity: 0; transition: opacity 0.4s; pointer-events: none;
}
.reward-card:hover { transform: translateY(-8px); border-color: var(--gold-brd); }
.reward-card:hover .card-glow { opacity: 1; }

.reward-qr {
  position: relative; z-index: 1;
  width: 200px; height: 200px;
  padding: 10px; border-radius: 18px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  margin-bottom: 1.5rem;
  transition: transform 0.4s;
}
.reward-card:hover .reward-qr { transform: scale(1.03); }
.reward-qr-img {
  width: 100%; height: 100%; object-fit: contain;
  border-radius: 10px; display: block;
}

.reward-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 0.5rem; }
.reward-card > p { font-size: 0.88rem; color: var(--text-dim); }

/* ===== Footer ===== */
.footer {
  position: relative; z-index: 1;
  padding: 3rem 2rem 2.5rem;
  text-align: center;
  border-top: 1px solid var(--glass-brd);
  background: rgba(6, 13, 31, 0.5);
  backdrop-filter: blur(8px);
}
.footer-inner { max-width: var(--maxw); margin: 0 auto; }

.footer-logo {
  display: flex; align-items: center; justify-content: center; gap: 0.5rem;
  margin-bottom: 1rem;
}
.footer-logo img { width: 96px; height: 96px; object-fit: contain; filter: drop-shadow(0 0 12px var(--gold-glow)); }
.footer-logo span { font-family: var(--f-display); font-size: 1.2rem; color: var(--gold-bright); }

.footer-copyright { margin-bottom: 0.8rem; }
.footer-copyright p { font-size: 0.85rem; color: var(--text-dim); }

.footer-filing {
  display: flex; align-items: center; justify-content: center; gap: 0.8rem;
  flex-wrap: wrap;
}
.footer-filing a {
  font-size: 0.8rem; color: var(--text-mute);
  transition: color 0.3s;
}
.footer-filing a:hover { color: var(--sky-pale); }
.filing-sep { width: 4px; height: 4px; background: var(--text-mute); border-radius: 50%; opacity: 0.5; }

/* ===== Reveal 动画 ===== */
.reveal {
  opacity: 0; transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .nav-links {
    position: fixed; top: 64px; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: rgba(6,13,31,0.95); backdrop-filter: blur(16px);
    padding: 1rem 0; border-bottom: 1px solid var(--glass-brd);
    transform: translateY(-120%); transition: transform 0.4s ease;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-link { padding: 0.9rem 2rem; border-radius: 0; text-align: center; }
  .nav-link::after { display: none; }
  .nav-toggle { display: flex; }

  .hero-subtitle p { white-space: normal; }
  .sub-line { display: none; }

  .section { padding: 3.5rem 1.2rem; }
  .board { padding: 1.8rem 1.2rem; }
  .board-pin-l { left: 16px; } .board-pin-r { right: 16px; }

  .download-cards { grid-template-columns: 1fr; }

  .footer-filing { flex-direction: column; gap: 0.4rem; }
  .filing-sep { display: none; }
}

@media (max-width: 480px) {
  .nav-inner { padding: 0.8rem 1.2rem; }
  .hero { padding-top: 5rem; }
  .hero-cta { padding: 0.75rem 2rem; font-size: 0.95rem; }
  .board-item { padding: 1rem 1.1rem; }
  .download-card { padding: 2.2rem 1.5rem 1.8rem; }
}