/* ========== 全局样式 ========== */

/*
 *  致她的情书 — 配色理念
 *
 *  白天：旧信纸上的玫瑰 — 像反复翻看的旧照片，温暖而珍重
 *  清晨：晨曦中的思念 — 天将亮未亮，最想她的那个时刻
 *  黄昏：余晖中的告白 — 一天中最温柔的光，像说"我在等你"
 *  夜晚：深夜独白 — 安静的、认真的、不打扰的爱
 */

/* ===== 白天 Day — 旧信笺玫瑰，珍重而温柔 ===== */
:root {
    --bg: #faf6f4;
    --bg-2: #f5eeea;
    --surface: #fffefe;
    --surface-hover: #f8f0ec;
    --border: rgba(180,140,140,.14);
    --text: #3c2828;
    --text-muted: #987070;
    --text-2: #987070;
    --text-3: #c0a0a0;
    --accent: #b86878;
    --accent-light: #d08898;
    --accent-2: #a87888;
    --accent-3: #d498a0;
    --rose: #d4909c;
    --rose-2: #e8c0c8;
    --gold: #c89878;
    --radius: 12px;
    --shadow: 0 2px 24px rgba(160,120,120,.1);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --card-shadow: 0 2px 24px rgba(160,120,120,.1);
    --overlay-from: rgba(250,246,244,.9);
    --overlay-to: rgba(250,246,244,0);
    --lb-bg: rgba(250,246,244,.97);
    --lb-shadow: 0 20px 60px rgba(60,40,40,.1);
    --btn-bg: rgba(184,104,120,.06);
    --btn-border: rgba(184,104,120,.14);
    --btn-hover: rgba(184,104,120,.1);
    --glow-opacity: .05;
    --grain-opacity: .012;
    --hero-glow: rgba(184,104,120,.1);
    --float-tag-bg: rgba(255,254,254,.92);
    --float-tag-border: rgba(180,140,140,.16);
    --ease: cubic-bezier(.25, .46, .45, .94);
    --ease-out: cubic-bezier(.16, 1, .3, 1);
    --serif: 'Noto Serif SC', 'Songti SC', 'STSong', serif;
    --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ===== 清晨 Dawn (5:00-8:00) — 天光微亮，最想你 ===== */
[data-period="dawn"] {
    --bg: #f4eef2;
    --bg-2: #eee6ee;
    --surface: #faf6fa;
    --surface-hover: #f0e8f0;
    --border: rgba(170,140,170,.14);
    --text: #38283a;
    --text-muted: #8868a0;
    --text-2: #8868a0;
    --text-3: #b098b8;
    --accent: #a870a0;
    --accent-light: #c088b8;
    --accent-2: #9880b0;
    --accent-3: #c898b8;
    --rose: #c890b0;
    --rose-2: #e0b8d0;
    --gold: #c098b0;
    --card-shadow: 0 2px 24px rgba(170,140,170,.1);
    --overlay-from: rgba(244,238,242,.9);
    --overlay-to: rgba(244,238,242,0);
    --lb-bg: rgba(244,238,242,.97);
    --lb-shadow: 0 20px 60px rgba(56,40,58,.1);
    --btn-bg: rgba(168,112,160,.06);
    --btn-border: rgba(168,112,160,.14);
    --btn-hover: rgba(168,112,160,.1);
    --hero-glow: rgba(168,112,160,.1);
    --float-tag-bg: rgba(250,246,250,.9);
    --float-tag-border: rgba(170,140,170,.16);
}

/* ===== 黄昏 Dusk (17:00-20:00) — 余晖温柔，我在等你 ===== */
[data-period="dusk"] {
    --bg: #f5e8e0;
    --bg-2: #eeddd2;
    --surface: #faf2ec;
    --surface-hover: #f0e4d8;
    --border: rgba(190,140,110,.18);
    --text: #402820;
    --text-muted: #a87058;
    --text-2: #a87058;
    --text-3: #c89878;
    --accent: #c86848;
    --accent-light: #e08868;
    --accent-2: #b87868;
    --accent-3: #e09878;
    --rose: #d88870;
    --rose-2: #e8b8a0;
    --gold: #d8a050;
    --card-shadow: 0 2px 24px rgba(190,140,110,.12);
    --overlay-from: rgba(245,232,224,.9);
    --overlay-to: rgba(245,232,224,0);
    --lb-bg: rgba(245,232,224,.97);
    --lb-shadow: 0 20px 60px rgba(64,40,32,.1);
    --btn-bg: rgba(200,104,72,.06);
    --btn-border: rgba(200,104,72,.16);
    --btn-hover: rgba(200,104,72,.1);
    --hero-glow: rgba(200,104,72,.12);
    --float-tag-bg: rgba(250,242,236,.92);
    --float-tag-border: rgba(190,140,110,.2);
}

/* ===== 夜晚 Night (20:00-5:00) — 深夜独白，安静的爱 ===== */
[data-period="night"] {
    --bg: #181216;
    --bg-2: #1e161c;
    --surface: #241a20;
    --surface-hover: #2e2228;
    --border: rgba(190,150,160,.1);
    --text: #e8d4d8;
    --text-muted: #a88890;
    --text-2: #a88890;
    --text-3: #705860;
    --accent: #c87890;
    --accent-light: #d890a8;
    --accent-2: #b08098;
    --accent-3: #d89898;
    --rose: #c88098;
    --rose-2: #402030;
    --gold: #c09878;
    --card-shadow: 0 2px 24px rgba(0,0,0,.25);
    --overlay-from: rgba(24,18,22,.92);
    --overlay-to: rgba(24,18,22,0);
    --lb-bg: rgba(24,18,22,.97);
    --lb-shadow: 0 20px 60px rgba(0,0,0,.45);
    --btn-bg: rgba(190,150,160,.08);
    --btn-border: rgba(190,150,160,.12);
    --btn-hover: rgba(190,150,160,.14);
    --glow-opacity: .08;
    --grain-opacity: .02;
    --hero-glow: rgba(200,120,144,.12);
    --float-tag-bg: rgba(36,26,32,.9);
    --float-tag-border: rgba(190,150,160,.12);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: rgba(184,104,120,.18) transparent;
    transition: background .6s var(--ease);
}
[data-period="night"] html {
    scrollbar-color: rgba(190,150,160,.12) transparent;
}

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    transition: background .6s var(--ease), color .6s var(--ease);
}

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-light); }

/* ========== 滚动条 ========== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(184,104,120,.18); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(184,104,120,.3); }
[data-period="night"] ::-webkit-scrollbar-thumb { background: rgba(190,150,160,.12); }
[data-period="night"] ::-webkit-scrollbar-thumb:hover { background: rgba(190,150,160,.22); }

/* ========== 头部 ========== */
.header {
    padding: 3rem 1.5rem 2rem;
    text-align: center;
    background: linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 100%);
    border-bottom: 1px solid var(--border);
    transition: background .6s var(--ease), border-color .6s var(--ease);
}

.header-inner { max-width: 1200px; margin: 0 auto; }

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-icon { font-size: 2.5rem; }

.logo h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent) 0%, var(--rose) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.site-desc {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    transition: color .6s var(--ease);
    font-style: italic;
}

/* ========== 分类导航 ========== */
.nav-cats {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.cat-btn {
    padding: 0.5rem 1.25rem;
    border-radius: 100px;
    background: var(--btn-bg);
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition);
    border: 1px solid var(--btn-border);
    cursor: pointer;
}

.cat-btn:hover {
    background: var(--btn-hover);
    color: var(--text);
    border-color: var(--border);
}

.cat-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--rose));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 2px 12px rgba(184,104,120,.2);
}

/* ========== Soft Grain ========== */
body::after {
    content: '';
    position: fixed; inset: 0; z-index: 9999;
    pointer-events: none;
    opacity: var(--grain-opacity);
    background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADIAAAAyCAMAAAAp4XiDAAAAUVBMVEWFhYWDg4N3d3dtbW17e3t1dXWBgYGHh4d5eXlzc3Oeli3teleVlZV7e3t3d3d5eXmeli3teleVlZWDg4OBgYF7e3t1dXVzc3N5eXl3d3d1dXVjYIdGAAAAG3RSTlMAQBAgMEBQUGBgcICAgJCQoKCwwMDQ4ODw8BASGuEAAAAJcEhZcwAADsMAAA7DAcdvqGQAAACFSURBVDiN7ZRBCsAgDATj2v//sBRpwkYFD97cA8PKgKvZnbgxxhhjjDHGGGOM+Q86u6xzHmOMMcYYY4wxxhhjjDHGGGOMMcYYY4wxxhhjjDHGGGOMMcYYY4wxxhhjjDHGGGOMMcYYY4wxxhhjjDHGGGOMMcYYY4wxxhhjjPkbXHYBuo8M5R8AAAAASUVORK5CYII=");
    background-size: 150px 150px;
}
@media (pointer: coarse) { body::after { display: none; } }

/* ========== 无障碍：减少动画 ========== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

@media (max-width: 768px) {
    .logo h1 { font-size: 1.5rem; }
    .header { padding: 2rem 1rem 1.5rem; }
}