/* ===== 潮宿 KEYS Design System v2 ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg-primary: #0D0D0D;
  --bg-secondary: #161616;
  --bg-card: #1C1C1E;
  --bg-card-hover: #242426;
  --bg-input: #1C1C1E;
  --bg-nav: rgba(13,13,13,0.85);
  --border: #2A2A2C;
  --border-hover: #3A3A3C;
  --text-primary: #F5F5F7;
  --text-secondary: #A1A1A6;
  --text-muted: #636366;
  --gold: #F5C518;
  --gold-hover: #FFD43B;
  --gold-dim: rgba(245,197,24,0.12);
  --green: #30D158;
  --red: #FF453A;
  --blue: #0A84FF;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
  --shadow-gold: 0 4px 20px rgba(245,197,24,0.2);
  --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-fast: all 0.15s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Noto Sans SC', sans-serif;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: #333; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* ===== NAV ===== */
.ks-nav {
  position: sticky; top: 0; z-index: 1000;
  background: var(--bg-nav);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px; height: 60px;
  display: flex; justify-content: space-between; align-items: center;
  transition: var(--transition);
}
.ks-nav-logo {
  font-size: 18px; color: var(--gold); font-weight: 700;
  text-decoration: none; display: flex; align-items: center; gap: 8px;
  letter-spacing: 0.5px;
}
.ks-nav-logo img { height: 32px; border-radius: 6px; }
.ks-nav-links { display: flex; align-items: center; gap: 8px; }
.ks-nav-link {
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 500; text-decoration: none;
  color: var(--text-secondary); transition: var(--transition-fast);
  border: 1px solid transparent;
}
.ks-nav-link:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.ks-nav-link.active {
  color: var(--bg-primary); background: var(--gold);
  font-weight: 600; border-color: transparent;
}
.ks-nav-link.outline {
  border: 1px solid var(--border); color: var(--text-secondary);
}
.ks-nav-link.outline:hover { border-color: var(--gold); color: var(--gold); }
.ks-nav-link.primary {
  background: var(--gold); color: var(--bg-primary); font-weight: 600;
}
.ks-nav-link.primary:hover { background: var(--gold-hover); box-shadow: var(--shadow-gold); }

/* Mobile hamburger */
.ks-hamburger {
  display: none; background: none; border: none; cursor: pointer; padding: 4px;
  flex-direction: column; gap: 5px;
}
.ks-hamburger span {
  display: block; width: 22px; height: 2px; background: var(--text-primary);
  border-radius: 2px; transition: var(--transition);
}
.ks-mobile-menu {
  display: none; position: fixed; top: 60px; left: 0; right: 0;
  background: var(--bg-secondary); border-bottom: 1px solid var(--border);
  padding: 16px 24px; flex-direction: column; gap: 8px; z-index: 999;
  animation: slideDown 0.25s ease;
}
.ks-mobile-menu.open { display: flex; }
.ks-mobile-menu a {
  display: block; padding: 12px 16px; border-radius: var(--radius-sm);
  color: var(--text-primary); text-decoration: none; font-size: 15px;
  transition: var(--transition-fast);
}
.ks-mobile-menu a:hover { background: rgba(255,255,255,0.05); }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .ks-nav-links { display: none; }
  .ks-hamburger { display: flex; }
}

/* ===== BUTTONS ===== */
.ks-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; border-radius: var(--radius-md);
  font-size: 14px; font-weight: 600; cursor: pointer;
  text-decoration: none; border: none;
  transition: var(--transition); position: relative; overflow: hidden;
}
.ks-btn::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(rgba(255,255,255,0.1), transparent);
  opacity: 0; transition: opacity 0.2s;
}
.ks-btn:hover::after { opacity: 1; }
.ks-btn-primary {
  background: var(--gold); color: var(--bg-primary);
}
.ks-btn-primary:hover { background: var(--gold-hover); box-shadow: var(--shadow-gold); transform: translateY(-1px); }
.ks-btn-outline {
  background: transparent; color: var(--gold);
  border: 1px solid var(--gold); /* explicit border for outline */
}
.ks-btn-outline:hover { background: var(--gold-dim); }
.ks-btn-ghost {
  background: rgba(255,255,255,0.06); color: var(--text-primary);
  border: 1px solid var(--border);
}
.ks-btn-ghost:hover { border-color: var(--border-hover); background: rgba(255,255,255,0.1); }
.ks-btn-lg { padding: 14px 32px; font-size: 16px; border-radius: var(--radius-lg); }
.ks-btn-sm { padding: 6px 14px; font-size: 13px; border-radius: var(--radius-sm); }
.ks-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none !important; }

/* ===== CARDS ===== */
.ks-card {
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border); overflow: hidden;
  transition: var(--transition); cursor: pointer;
  text-decoration: none; color: inherit; display: block;
}
.ks-card:hover {
  transform: translateY(-4px); border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}
.ks-card-img {
  width: 100%; height: 200px; overflow: hidden;
  background: var(--bg-secondary); position: relative;
}
.ks-card-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.5s ease;
}
.ks-card:hover .ks-card-img img { transform: scale(1.05); }
.ks-card-img .placeholder {
  width: 100%; height: 100%; display: flex;
  align-items: center; justify-content: center;
  font-size: 48px; background: linear-gradient(135deg, #1C1C1E, #2C2C2E);
}
.ks-card-body { padding: 16px 18px 18px; }
.ks-card-title {
  font-size: 16px; font-weight: 600; margin-bottom: 6px;
  line-height: 1.4; color: var(--text-primary);
}
.ks-card-subtitle {
  font-size: 13px; color: var(--text-muted); margin-bottom: 12px;
  display: flex; align-items: center; gap: 4px;
}
.ks-card-price {
  display: flex; align-items: baseline; gap: 4px;
}
.ks-card-price .amount {
  font-size: 22px; font-weight: 700; color: var(--gold);
}
.ks-card-price .unit {
  font-size: 13px; color: var(--text-muted);
}
.ks-card-footer {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 14px; padding-top: 14px;
  border-top: 1px solid var(--border);
}
.ks-card-meta {
  font-size: 12px; color: var(--text-muted);
}

/* ===== TAG / BADGE ===== */
.ks-tag {
  display: inline-block; padding: 4px 10px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
}
.ks-tag-gold { background: var(--gold-dim); color: var(--gold); }
.ks-tag-green { background: rgba(48,209,88,0.15); color: var(--green); }
.ks-tag-blue { background: rgba(10,132,255,0.15); color: var(--blue); }
.ks-tag-red { background: rgba(255,69,58,0.15); color: var(--red); }
.ks-tag-music { background: rgba(167,139,250,0.15); color: #a78bfa; }
.ks-tag-outdoor { background: rgba(74,222,128,0.15); color: #4ade80; }
.ks-tag-culture { background: rgba(251,146,60,0.15); color: #fb923c; }
.ks-tag-food { background: rgba(251,191,36,0.15); color: #fbbf24; }
.ks-tag-sport { background: rgba(56,189,248,0.15); color: #38bdf8; }
.ks-tag-art { background: rgba(244,114,182,0.15); color: #f472b6; }
.ks-tag-tech { background: rgba(96,165,250,0.15); color: #60a5fa; }
.ks-tag-other { background: rgba(168,162,158,0.15); color: #a8a29e; }

/* ===== INPUTS ===== */
.ks-input {
  width: 100%; background: var(--bg-input);
  border: 1px solid var(--border); border-radius: var(--radius-md);
  padding: 12px 16px; color: var(--text-primary);
  font-size: 15px; outline: none; font-family: inherit;
  transition: var(--transition-fast);
}
.ks-input:focus { border-color: var(--gold); box-shadow: 0 0 0 3px var(--gold-dim); }
.ks-input::placeholder { color: var(--text-muted); }
.ks-input-label {
  display: block; font-size: 13px; font-weight: 500;
  color: var(--text-secondary); margin-bottom: 8px;
}

/* ===== GRID ===== */
.ks-grid {
  display: grid; gap: 20px; padding: 0 24px;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.ks-container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== HERO ===== */
.ks-hero {
  text-align: center; padding: 80px 24px 48px;
  position: relative;
}
.ks-hero::before {
  content: ''; position: absolute; top: 0; left: 50%;
  transform: translateX(-50%);
  width: 600px; height: 400px;
  background: radial-gradient(ellipse, var(--gold-dim), transparent 70%);
  pointer-events: none; z-index: 0;
}
.ks-hero > * { position: relative; z-index: 1; }
.ks-hero h1 {
  font-size: 44px; font-weight: 800;
  background: linear-gradient(135deg, var(--gold), #FFE066);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; letter-spacing: 2px; margin-bottom: 12px;
}
.ks-hero .subtitle {
  font-size: 18px; font-weight: 300; letter-spacing: 6px;
  color: var(--text-muted); margin-bottom: 16px;
}
.ks-hero .desc {
  font-size: 15px; color: var(--text-secondary);
  max-width: 480px; margin: 0 auto 36px; line-height: 1.8;
}
.ks-hero-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== SECTION ===== */
.ks-section-title {
  text-align: center; padding: 48px 24px 32px;
}
.ks-section-title h2 {
  font-size: 22px; font-weight: 700; margin-bottom: 8px;
}
.ks-section-title p {
  color: var(--text-muted); font-size: 14px;
}

/* ===== FEATURES ===== */
.ks-features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px; padding: 0 24px 60px; max-width: 960px; margin: 0 auto;
}
.ks-feature {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px 24px; text-align: center;
  transition: var(--transition);
}
.ks-feature:hover {
  border-color: var(--border-hover); transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}
.ks-feature .icon {
  font-size: 36px; margin-bottom: 16px;
  display: inline-block; animation: float 3s ease-in-out infinite;
}
.ks-feature:nth-child(2) .icon { animation-delay: 0.5s; }
.ks-feature:nth-child(3) .icon { animation-delay: 1s; }
.ks-feature h3 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.ks-feature p { font-size: 13px; color: var(--text-muted); line-height: 1.7; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ===== FILTER BAR ===== */
.ks-filters {
  display: flex; gap: 8px; justify-content: center;
  flex-wrap: wrap; padding: 0 24px 36px;
}
.ks-filter-btn {
  padding: 8px 18px; border-radius: 20px;
  border: 1px solid var(--border); background: transparent;
  color: var(--text-secondary); cursor: pointer;
  font-size: 13px; font-weight: 500;
  transition: var(--transition-fast); white-space: nowrap;
}
.ks-filter-btn:hover { border-color: var(--gold); color: var(--gold); }
.ks-filter-btn.active {
  background: var(--gold); color: var(--bg-primary);
  border-color: var(--gold); font-weight: 600;
}

/* ===== FOOTER ===== */
.ks-footer {
  text-align: center; padding: 32px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted); font-size: 13px; margin-top: 40px;
}
.ks-footer a { color: var(--text-secondary); text-decoration: none; transition: var(--transition-fast); }
.ks-footer a:hover { color: var(--gold); }

/* ===== EMPTY STATE ===== */
.ks-empty {
  text-align: center; padding: 80px 24px; color: var(--text-muted);
}
.ks-empty .icon { font-size: 56px; margin-bottom: 16px; opacity: 0.5; }
.ks-empty p { font-size: 15px; }

/* ===== LOADING ===== */
.ks-loading { text-align: center; padding: 60px; color: var(--text-muted); }
.ks-spinner {
  width: 32px; height: 32px; border: 3px solid var(--border);
  border-top-color: var(--gold); border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== BANNER ===== */
.ks-banner { position: relative; width: 100%; overflow: hidden; background: var(--bg-secondary); }
.ks-banner .slides { display: flex; transition: transform 0.5s ease; }
.ks-banner .slide { min-width: 100%; position: relative; }
.ks-banner .slide img { width: 100%; height: 360px; object-fit: cover; display: block; }
.ks-banner .slide-overlay {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 24px 40px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
}
.ks-banner .slide-title { color: #fff; font-size: 20px; font-weight: 700; }
.ks-banner-dots {
  position: absolute; bottom: 16px; left: 50%;
  transform: translateX(-50%); display: flex; gap: 8px;
}
.ks-banner-dots .dot {
  width: 8px; height: 8px; border-radius: 4px;
  background: rgba(255,255,255,0.3); cursor: pointer;
  transition: var(--transition);
}
.ks-banner-dots .dot.active {
  background: var(--gold); width: 24px;
}
.ks-banner-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(0,0,0,0.4); backdrop-filter: blur(10px);
  color: #fff; border: none;
  width: 40px; height: 40px; border-radius: 50%;
  cursor: pointer; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition-fast);
}
.ks-banner-arrow:hover { background: rgba(245,197,24,0.5); }
.ks-banner-arrow.prev { left: 16px; }
.ks-banner-arrow.next { right: 16px; }

/* ===== LOGIN CARD ===== */
.ks-login-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-xl); padding: 36px 32px;
  width: 100%; max-width: 400px;
  box-shadow: var(--shadow-lg);
}
.ks-tabs {
  display: flex; background: var(--bg-primary); border-radius: var(--radius-md);
  padding: 4px; margin-bottom: 28px;
}
.ks-tab {
  flex: 1; text-align: center; padding: 10px; border-radius: var(--radius-sm);
  font-size: 14px; cursor: pointer; color: var(--text-muted);
  transition: var(--transition-fast); font-weight: 500;
}
.ks-tab.active {
  background: var(--gold); color: var(--bg-primary); font-weight: 600;
}
.ks-input-group { margin-bottom: 18px; }

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in-up { animation: fadeInUp 0.6s ease forwards; }
.fade-in-up:nth-child(1) { animation-delay: 0.1s; }
.fade-in-up:nth-child(2) { animation-delay: 0.2s; }
.fade-in-up:nth-child(3) { animation-delay: 0.3s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
  .ks-hero { padding: 48px 20px 32px; }
  .ks-hero h1 { font-size: 32px; }
  .ks-hero .subtitle { font-size: 14px; letter-spacing: 4px; }
  .ks-grid { grid-template-columns: 1fr; padding: 0 16px; gap: 16px; }
  .ks-features { grid-template-columns: 1fr; padding: 0 16px 40px; }
  .ks-filters { padding: 0 16px 24px; }
  .ks-container { padding: 0 16px; }
  .ks-card-img { height: 180px; }
  .ks-banner .slide img { height: 220px; }
  .ks-login-card { padding: 28px 20px; margin: 0 16px; }
  .ks-nav { padding: 0 16px; }
}