/* ══════════════════════════════════════════
   Wang Laoshi's Space — Global Stylesheet
   ══════════════════════════════════════════ */

/* 1. Web Font */
@import url('https://cdn.jsdelivr.net/npm/lxgw-wenkai-lite-webfont@1.1.0/style.css');

/* CJK-only KaiTi — unicode-range restricts this face to Chinese/CJK characters only,
   so Latin letters, digits, and symbols automatically fall back to LXGW WenKai Lite. */
@font-face {
    font-family: "KaiTi-CJK";
    src: local("STKaiti-SC-Regular"), local("STKaiti"), local("Kaiti SC"),
         local("BiauKai"), local("KaiTi"), local("楷体");
    unicode-range:
        U+2E80-2EFF,   /* CJK Radicals Supplement */
        U+2F00-2FDF,   /* Kangxi Radicals */
        U+3000-303F,   /* CJK Symbols and Punctuation (。，！？、《》…) */
        U+3040-30FF,   /* Hiragana + Katakana */
        U+31F0-31FF,   /* Katakana Phonetic Extensions */
        U+3200-32FF,   /* Enclosed CJK Letters */
        U+3400-4DBF,   /* CJK Extension A */
        U+4E00-9FFF,   /* CJK Unified Ideographs (main block) */
        U+F900-FAFF,   /* CJK Compatibility Ideographs */
        U+FE30-FE4F,   /* CJK Compatibility Forms */
        U+FF00-FFEF,   /* Halfwidth and Fullwidth Forms */
        U+20000-2A6DF; /* CJK Extension B */
}

/* 2. Global Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: "LXGW WenKai Lite", system-ui, -apple-system, sans-serif;
    background-color: #f0f3f7;
    color: #1a2740;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Font Utility Classes ── */

/* English: LXGW WenKai Lite */
.font-en {
    font-family: "LXGW WenKai Lite", system-ui, sans-serif !important;
}

/* Chinese: KaiTi priority, LXGW fallback */
.font-zh {
    font-family: "KaiTi-CJK", "LXGW WenKai Lite", serif !important;
}

/* Chinese phrases — Safari-optimized KaiTi stack */
.phrase-text {
    font-family: "KaiTi-CJK", "LXGW WenKai Lite", serif !important;
}

/* 3. Legacy Header (used by sub-pages not yet migrated) */
.header {
    background: linear-gradient(135deg, #1a2740 0%, #243552 100%);
    color: white;
    padding: 15px 10px;
    text-align: center;
    border-bottom: none;
    position: relative;
    overflow: hidden;
}
.header::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4e8a8b, #f0a832, #4e8a8b);
}

.header h1 {
    margin: 0;
    font-size: 2rem;
    color: #fff;
}

/* 4. Navigation */
.back-btn {
    color: #f0a832;
    text-decoration: none;
    font-weight: bold;
    transition: opacity 0.2s;
}
.back-btn:hover { opacity: 0.8; }

.back-btn-home {
    position: absolute;
    top: 15px; left: 20px;
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    z-index: 50;
    padding: 6px 14px;
    border-radius: 8px;
    transition: background 0.2s, color 0.2s;
}
.back-btn-home:hover {
    background: rgba(255,255,255,0.08);
    color: #f0a832;
}

/* 5. Global Button */
.btn {
    padding: 10px 22px;
    background-color: #f0a832;
    color: #1a2740;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: bold;
    font-family: inherit;
    font-size: 0.95rem;
    transition: background 0.2s, transform 0.15s;
}
.btn:hover {
    background-color: #d4922a;
}
.btn:active {
    transform: scale(0.97);
}

/* 6. Animations */
@keyframes tada {
    0%   { transform: scale(1); }
    10%, 20% { transform: scale(0.9) rotate(-3deg); }
    30%, 50%, 70%, 90% { transform: scale(1.1) rotate(3deg); }
    40%, 60%, 80% { transform: scale(1.1) rotate(-3deg); }
    100% { transform: scale(1); }
}
.success-anim { animation: tada 0.8s; }

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 0.4s ease-out; }