/* ============================================================
   KOOMZE Common Styles — shared across all pages
   Light theme only (dark mode removed)
   ============================================================ */

/* ========== CSS Variables ========== */
:root {
    --bg: #f0f2f5;
    --card: #ffffff;
    --card2: #f5f5f8;
    --text: #1a1a2e;
    --text2: #5a5a72;
    --text3: #9090a8;
    --border: #e0e0e8;
    --border2: #d0d0d8;
    --theme: #e33f3f;
    --theme2: #ff5252;
    --theme-glow: rgba(227,63,63,0.25);
    --shadow: rgba(0,0,0,0.08);
    --shadow-lg: rgba(0,0,0,0.12);
    --scanline: rgba(0,0,0,0.02);
    --grid-color: rgba(0,0,0,0.04);
    --radius-sm: 12px;
    --radius: 20px;
    --radius-lg: 28px;
    --topbar-h: 56px;
}

/* ========== Reset & Base ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html {
    scroll-behavior: smooth;
    font-family: system-ui, 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
    min-width: 1200px;
}
body {
    background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh;
    min-width: 1200px;
    -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
    transition: background 0.3s ease, color 0.2s ease;
}
body::before {
    content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 0;
    background:
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
        linear-gradient(180deg, var(--grid-color) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 70% 80% at 50% 30%, rgba(0,0,0,0.35) 0%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 70% 80% at 50% 30%, rgba(0,0,0,0.35) 0%, transparent 100%);
}
body::after {
    content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 0;
    background: repeating-linear-gradient(0deg, transparent, transparent 2px, var(--scanline) 2px, var(--scanline) 4px);
    opacity: 0.4;
}

/* ========== Top Bar ========== */
.top-bar {
    display: flex; justify-content: space-between; align-items: center; padding: 10px 28px;
    background: transparent; border-bottom: 1px solid transparent;
    position: fixed; top: 0; left: 0; min-width: 1200px; width: 100%; z-index: 1000;
    gap: 14px; flex-wrap: wrap;
    transition: background 0.35s ease, border-color 0.35s ease,
                box-shadow 0.35s ease, backdrop-filter 0.35s ease;
}
.top-bar.scrolled {
    background: rgba(255,255,255,0.88); border-bottom: 1px solid var(--border);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px var(--shadow);
}
/* Transparent-state overrides — applied only when NOT scrolled */
.top-bar:not(.scrolled) .nav-link,
.top-bar:not(.scrolled) .dropdown-toggle {
    color: #fff; text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}
/* Transparent top bar: dark icons → white, matching text color */
.top-bar:not(.scrolled) .nav-icon,
.top-bar:not(.scrolled) .lang-icon,
.top-bar:not(.scrolled) .logo-img {
    filter: brightness(0) invert(1);
    transition: filter 0.35s ease;
}

/* ========== Logo ========== */
.logo-link { text-decoration: none; color: inherit; display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.logo-img { height: 32px; width: auto; display: block; transition: filter 0.35s ease; }

/* ========== Navigation ========== */
.nav-links { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.nav-link, .dropdown-toggle {
    padding: 9px 18px; border-radius: 6px; cursor: pointer; font-weight: 600; font-size: 14px;
    text-decoration: none; color: var(--text2); white-space: nowrap; border: 1px solid transparent;
    letter-spacing: 0.3px; background: transparent;
    transition: all 0.25s cubic-bezier(0.34,1.56,0.64,1);
    display: flex; align-items: center; gap: 5px;
}
.nav-link:hover, .dropdown-toggle:hover {
    color: var(--text); background: var(--card2);
    box-shadow: 0 4px 20px var(--shadow); transform: translateY(-1px);
}
.nav-link.active, .dropdown-toggle.active {
    color: var(--theme); border-bottom: 2px solid var(--theme);
    background: transparent; border-radius: 0; box-shadow: none;
}
/* Nav icon inside links */
.nav-icon { width: 18px; height: 18px; object-fit: contain; flex-shrink: 0; transition: filter 0.35s ease; }
.footer-icon { width: 16px; height: 16px; object-fit: contain; flex-shrink: 0; vertical-align: middle; }
.lang-icon { width: 20px; height: 20px; object-fit: contain; flex-shrink: 0; transition: filter 0.35s ease; }

/* ========== Dropdown Menu ========== */
.dropdown { position: relative; display: inline-block; }
.dropdown-toggle::after { content: '▾'; font-size: 11px; transition: transform 0.25s; margin-left: 2px; }
.dropdown.open .dropdown-toggle::after { transform: rotate(180deg); }
.dropdown-menu {
    position: absolute; top: 100%; left: 50%;
    transform: translateX(-50%) translateY(-6px); margin-top: 10px;
    background: rgba(255,255,255,0.92); backdrop-filter: blur(28px); -webkit-backdrop-filter: blur(28px);
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: 10px; min-width: 140px;
    box-shadow: 0 20px 50px var(--shadow);
    opacity: 0; visibility: hidden; pointer-events: none;
    transition: all 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
    display: flex; flex-direction: column; gap: 2px; z-index: 1001;
}
.dropdown-menu.show {
    opacity: 1; visibility: visible; pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}
.dropdown-item {
    padding: 9px 12px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 500;
    color: var(--text); text-decoration: none;
    transition: all 0.25s cubic-bezier(0.34,1.56,0.64,1);
    display: block; white-space: nowrap; background: transparent;
}
.dropdown-item:hover {
    background: var(--theme); color: #fff;
    box-shadow: 0 4px 16px var(--theme-glow); transform: scale(1.05);
}

/* ========== Language Select ========== */
.top-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.lang-switch { position: relative; display: inline-flex; align-items: center; cursor: pointer; }
.lang-switch .lang-icon { width: 20px; height: 20px; pointer-events: none; transition: filter 0.35s ease; }
.lang-switch .lang-select {
    position: absolute; inset: 0; width: 100%; height: 100%; z-index: 1;
    opacity: 0; cursor: pointer;
}

/* ========== Footer ========== */
.footer {
    background: var(--card); border-top: 1px solid var(--border); padding: 40px 5%;
    text-align: center; color: var(--text2); font-size: 13px; position: relative; z-index: 1;
}
.footer-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 24px; margin-bottom: 18px; }
.footer a { color: var(--text2); text-decoration: none; transition: color 0.2s; font-weight: 500; }
.footer a:hover { color: var(--theme); }

/* ====== Footer Social Platforms ====== */
.social-platform { position: relative; display: inline-block; cursor: default; }
.social-name { font-weight: 500; color: var(--text2); transition: color 0.2s; }
.social-platform:hover .social-name { color: var(--theme); }
.social-qr {
    display: none; position: absolute; bottom: calc(100% + 12px); left: 50%;
    transform: translateX(-50%); z-index: 100;
    background: var(--card); border: 1px solid var(--border);
    border-radius: 12px; padding: 8px; box-shadow: 0 16px 48px rgba(0,0,0,0.2);
}
.social-qr img { width: 120px; height: 120px; object-fit: contain; display: block; border-radius: 8px; }
.social-platform:hover .social-qr { display: block; }
.social-sep { color: var(--border2); margin: 0 6px; }

/* ========== Language Toggle ========== */
.lang-zh, .lang-tw, .lang-en { display: none; }
html[lang="zh-CN"] .lang-zh { display: inline-block; }
html[lang="zh-TW"] .lang-tw { display: inline-block; }
html[lang="en"] .lang-en { display: inline-block; }
html[lang="zh-CN"] span.lang-zh { display: inline; }
html[lang="zh-TW"] span.lang-tw { display: inline; }
html[lang="en"] span.lang-en { display: inline; }

/* ========== Shared Media Queries (Navigation) ========== */
@media (max-width: 768px) {
    :root { --topbar-h: 48px; }
    .top-bar { padding: 8px 14px; gap: 6px; }
    .nav-link, .dropdown-toggle { padding: 7px 12px; font-size: 12px; }
    .dropdown-menu {
        min-width: 120px;
        left: 0; transform: translateX(-15%) translateY(-6px);
    }
    .dropdown-menu.show { transform: translateX(-15%) translateY(0); }
}

/* ========== Shared Keyframes ========== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========== Shared Entry Animations ========== */
.top-bar { animation: fadeIn 0.5s ease both; }
.footer  { animation: fadeIn 0.6s ease both; animation-delay: 0.4s; }

/* ========== Page Loader（全局加载动画） ========== */
.page-loader {
    position: fixed; inset: 0; z-index: 10000;
    background: var(--bg);
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 20px;
    transition: opacity 0.45s ease, visibility 0.45s ease;
}
.page-loader.hidden {
    opacity: 0; visibility: hidden; pointer-events: none;
}
.page-loader .spinner {
    width: 48px; height: 48px;
    border: 4px solid var(--border);
    border-top-color: var(--theme);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}
.page-loader .loader-text {
    color: var(--text2); font-size: 14px; font-weight: 500;
    letter-spacing: 0.5px;
}