/* 时光邮局 现代化首页样式 - 2026 Ink & Accent 风格
   配色：纯白底 + 近黑文字 + 单一蓝色强调
   参考：Linear / Vercel / Notion 极简风格 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@600;700;800&display=swap');

:root {
    /* 主色调：纯白 + 近黑 + 天蓝（2026 Ink & Accent，蓝色更轻盈） */
    --primary: #3B82F6;            /* 天蓝 - 主按钮/链接，比钴蓝更轻盈 */
    --primary-dark: #2563EB;
    --primary-light: #EFF6FF;      /* 极浅蓝 - 悬停底色 */
    --primary-ring: rgba(59,130,246,0.18);

    --accent: #0F172A;             /* 深墨色 - 副按钮 */
    --accent-light: #1E293B;

    /* 中性色阶 */
    --text: #0A0A0A;               /* 近黑 - 标题 */
    --text-secondary: #404040;     /* 正文 */
    --text-light: #737373;         /* 弱文字 */
    --text-muted: #A3A3A3;         /* 最弱 */

    --bg: #FFFFFF;                 /* 主背景 */
    --bg-soft: #FAFAFA;            /* 次背景 */
    --bg-card: #FFFFFF;            /* 卡片 */
    --border: #E5E5E5;             /* 边框 */
    --border-soft: #F0F0F0;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.04);
    --shadow: 0 4px 12px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.03);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
    --shadow-primary: 0 8px 24px rgba(59,130,246,0.25);
    --shadow-accent: 0 8px 24px rgba(15,23,42,0.18);

    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 20px;

    --transition: all .25s cubic-bezier(.4,0,.2,1);
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "cv02","cv03","cv04","cv11";
}
a { color:inherit; text-decoration:none; transition: var(--transition); }
img { max-width:100%; display:block; }
button { font-family:inherit; cursor:pointer; border:none; background:none; }
input, textarea, select { font-family:inherit; }

/* ============ 顶部导航 ============ */
.navbar {
    position:sticky; top:0; z-index:100;
    background:rgba(255,255,255,0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--border-soft);
}
.navbar-inner {
    position:relative;
    max-width:1200px; margin:0 auto; padding:0 24px;
    height:64px; display:flex; align-items:center; justify-content:space-between;
}
.logo {
    display:flex; align-items:center; gap:10px;
    font-size:19px; font-weight:700; color:var(--text);
    letter-spacing:-0.02em;
}
.logo-icon {
    width:32px; height:32px; border-radius:8px;
    background: var(--accent);
    display:flex; align-items:center; justify-content:center;
    color:#fff;
}
.logo-icon svg { width:18px; height:18px; }
.nav-links { display:flex; align-items:center; gap:4px; }
.nav-links a, .nav-links button {
    padding:8px 14px; border-radius:var(--radius-sm);
    color:var(--text-secondary); font-size:14px; font-weight:500;
}
/* Hamburger 菜单按钮（移动端） */
.nav-toggle {
    display:none; width:40px; height:40px; border:none; background:transparent;
    cursor:pointer; padding:8px; border-radius:var(--radius-sm);
    flex-direction:column; justify-content:center; align-items:center; gap:5px;
}
.nav-toggle span {
    display:block; width:20px; height:2px; background:var(--text);
    border-radius:2px; transition:all .25s ease;
}
.nav-toggle.active span:nth-child(1) { transform:translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity:0; }
.nav-toggle.active span:nth-child(3) { transform:translateY(-7px) rotate(-45deg); }
.nav-links a:hover { color:var(--text); background:var(--bg-soft); }
.btn-primary {
    background: var(--primary); color:#fff !important;
    font-weight:600 !important;
    box-shadow: 0 1px 2px rgba(59,130,246,0.3);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform:translateY(-1px);
    box-shadow: var(--shadow-primary);
}

/* ============ Hero 首屏 ============ */
.hero {
    position:relative; overflow:hidden;
    padding:120px 24px 100px; text-align:center;
    background: var(--bg);
    color: var(--text);
}
/* 网格背景纹理 */
.hero::before {
    content:''; position:absolute; inset:0;
    background-image:
        linear-gradient(to right, rgba(0,0,0,0.025) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(0,0,0,0.025) 1px, transparent 1px);
    background-size: 56px 56px;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
    pointer-events:none;
}
/* 顶部蓝色光晕 */
.hero::after {
    content:''; position:absolute; top:-200px; left:50%; transform:translateX(-50%);
    width:800px; height:500px;
    background: radial-gradient(ellipse at center, rgba(59,130,246,0.12) 0%, transparent 60%);
    pointer-events:none;
}
.hero-content { position:relative; max-width:820px; margin:0 auto; }
.hero-badge {
    display:inline-flex; align-items:center; gap:8px;
    padding:6px 14px; border-radius:999px;
    background:#fff; border:1px solid var(--border);
    font-size:13px; margin-bottom:28px; color:var(--text-secondary);
    box-shadow: var(--shadow-sm);
}
.hero-badge .dot {
    width:6px; height:6px; border-radius:50%; background:var(--primary);
    box-shadow: 0 0 0 3px var(--primary-ring);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%,100% { box-shadow: 0 0 0 3px var(--primary-ring); }
    50% { box-shadow: 0 0 0 6px rgba(59,130,246,0.05); }
}
.hero h1 {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-size:clamp(38px, 6.5vw, 68px); font-weight:800;
    line-height:1.1; margin-bottom:24px;
    letter-spacing:-0.03em;
    color: var(--text);
}
.hero h1 .ink {
    color: var(--text);
    position: relative;
}
/* 打字机关键词容器 */
.typewriter-wrap {
    display: inline-block;
    position: relative;
    color: var(--primary);
    min-width: 1ch;
    /* 粉色下划线 - 装饰元素 */
    border-bottom: 4px solid #FF4D8D;
    padding-bottom: 2px;
    border-radius: 2px;
}
.typewriter-text {
    display: inline-block;
    border-right: 3px solid var(--primary);
    padding-right: 4px;
    animation: blink 0.9s step-end infinite;
}
@keyframes blink {
    0%, 50% { border-color: var(--primary); }
    51%, 100% { border-color: transparent; }
}
.hero-sub {
    font-size:clamp(16px, 2vw, 19px);
    color: var(--text-secondary);
    margin-bottom:40px; line-height:1.7;
    max-width: 640px; margin-left:auto; margin-right:auto;
}
.hero-actions { display:flex; gap:14px; justify-content:center; flex-wrap:wrap; }
.btn-lg {
    padding:14px 28px; border-radius:var(--radius);
    font-size:15px; font-weight:600; transition:var(--transition);
    display:inline-flex; align-items:center; gap:8px;
    letter-spacing:-0.01em;
}
.btn-white {
    background:var(--accent); color:#fff;
    box-shadow: var(--shadow-accent);
}
.btn-white:hover {
    background: var(--accent-light);
    transform:translateY(-2px);
    box-shadow: 0 12px 32px rgba(15,23,42,0.25);
}
.btn-primary-lg {
    background: var(--primary); color:#fff;
    box-shadow: var(--shadow-primary);
}
.btn-primary-lg:hover {
    background: var(--primary-dark);
    transform:translateY(-2px);
}
.btn-ghost {
    background:#fff; color:var(--text);
    border:1px solid var(--border);
    box-shadow: var(--shadow-sm);
}
.btn-ghost:hover {
    background: var(--bg-soft);
    border-color: var(--text-light);
    transform:translateY(-2px);
}

/* 浮动装饰 - 信封 */
.float-deco {
    position:absolute; opacity:0.25;
    animation: float 6s ease-in-out infinite;
    filter: grayscale(0.3);
    color: var(--primary);
}
.float-deco svg { width:40px; height:40px; }
@keyframes float { 0%,100%{transform:translateY(0) rotate(-3deg);} 50%{transform:translateY(-20px) rotate(3deg);} }

/* ============ 通用容器 ============ */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:96px 0; }
.section-title {
    text-align:center; margin-bottom:12px;
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-size:clamp(28px, 4vw, 42px); font-weight:800;
    letter-spacing:-0.02em;
    color: var(--text);
}
.section-sub {
    text-align:center; color:var(--text-light);
    font-size:16px; margin-bottom:56px;
}
.section-eyebrow {
    display:inline-block;
    padding: 4px 12px; border-radius:999px;
    background: var(--primary-light); color: var(--primary);
    font-size:12px; font-weight:600; letter-spacing:0.05em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

/* ============ 特色卡片 ============ */
.features { display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:20px; }
.feature-card {
    background:var(--bg-card); padding:32px 28px;
    border-radius:var(--radius-lg); box-shadow:var(--shadow-sm);
    transition:var(--transition); border:1px solid var(--border-soft);
    position:relative; overflow:hidden;
}
.feature-card::before {
    content:''; position:absolute; top:0; left:0; right:0; height:2px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0); transform-origin:left;
    transition: transform .3s ease;
}
.feature-card:hover {
    transform:translateY(-4px);
    box-shadow:var(--shadow-lg);
    border-color: var(--border);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon {
    width:48px; height:48px; border-radius:12px;
    background: var(--primary-light);
    display:flex; align-items:center; justify-content:center;
    margin-bottom:20px;
    color: var(--primary);
}
.feature-icon svg { width:24px; height:24px; }
/* 空状态图标容器 */
.empty-ic { width:48px; height:48px; margin:0 auto 16px; color:var(--primary); }
.empty-ic svg { width:100%; height:100%; }
.feature-card h3 {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-size:18px; margin-bottom:10px; font-weight:700;
    color: var(--text);
    letter-spacing:-0.01em;
}
.feature-card p { color:var(--text-secondary); font-size:14px; line-height:1.7; }

/* ============ 步骤 ============ */
.steps {
    display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
    gap:32px; margin-top:48px; counter-reset:step;
}
.step {
    text-align:center; position:relative; padding:20px;
}
.step-num {
    width:56px; height:56px; margin:0 auto 20px;
    border-radius:50%;
    background:#fff; color:var(--text);
    border:2px solid var(--border);
    display:flex; align-items:center; justify-content:center;
    font-size:20px; font-weight:800;
    counter-increment:step;
    transition: var(--transition);
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
}
.step:hover .step-num {
    background: var(--accent); color:#fff; border-color:var(--accent);
    transform: scale(1.05);
}
.step-num::before { content: counter(step); }
.step h4 {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-size:18px; margin-bottom:8px; font-weight:700;
    color: var(--text);
}
.step p { color:var(--text-secondary); font-size:14px; }

/* ============ 公开信件瀑布流 ============ */
.wall-section { position:relative; }
.wall-section::before {
    content:''; position:absolute; top:0; left:50%; transform:translateX(-50%);
    width:1px; height:60px; background:linear-gradient(to bottom, transparent, var(--border));
}
.letters-grid {
    columns: 3 300px; column-gap:24px;
}
.letter-card {
    break-inside:avoid; margin-bottom:24px;
    background:var(--bg-card); border-radius:var(--radius);
    box-shadow:var(--shadow-sm); overflow:hidden;
    transition: transform .35s cubic-bezier(.4,0,.2,1), box-shadow .35s, border-color .35s;
    cursor:pointer; border:1px solid var(--border-soft);
    opacity:0; transform:translateY(20px);
    animation: cardIn .6s cubic-bezier(.4,0,.2,1) forwards;
    position:relative;
}
@keyframes cardIn {
    to { opacity:1; transform:translateY(0); }
}
.letter-card:hover {
    transform:translateY(-6px);
    box-shadow:0 20px 50px rgba(0,0,0,0.1), 0 8px 16px rgba(0,0,0,0.04);
    border-color: var(--border);
}
.letter-card-cover {
    position:relative; overflow:hidden; aspect-ratio: 4/3; background:var(--bg-soft);
}
.letter-card-cover img {
    width:100%; height:100%; object-fit:cover;
    transition: transform .6s cubic-bezier(.4,0,.2,1);
}
.letter-card:hover .letter-card-cover img { transform:scale(1.08); }
.letter-card-cover-overlay {
    position:absolute; inset:0;
    background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.45) 100%);
    pointer-events:none;
}
.letter-card-badge {
    position:absolute; top:12px; left:12px;
    display:inline-flex; align-items:center; gap:5px;
    padding:5px 11px; border-radius:999px;
    background:rgba(255,255,255,0.92); backdrop-filter:blur(10px);
    color:var(--text); font-size:11px; font-weight:700;
    letter-spacing:0.02em;
    box-shadow:0 2px 8px rgba(0,0,0,0.08);
}
.badge-dot {
    width:6px; height:6px; border-radius:50%;
    background:var(--primary);
    box-shadow:0 0 0 3px var(--primary-ring);
    animation: pulse 2s infinite;
}
.letter-card-featured {
    border-color: rgba(59,130,246,0.3);
    box-shadow:0 4px 16px rgba(59,130,246,0.08), 0 1px 3px rgba(0,0,0,0.04);
}
.letter-card-featured::after {
    content:''; position:absolute; top:0; left:0; right:0; height:3px;
    background:linear-gradient(90deg, var(--primary), #FF4D8D);
}
.letter-card-featured:hover {
    box-shadow:0 24px 60px rgba(59,130,246,0.15), 0 8px 16px rgba(0,0,0,0.04);
}
.letter-card-body { padding:24px 26px 22px; }
.letter-card-title {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-size:18px; font-weight:700; margin-bottom:10px;
    color:var(--text); line-height:1.4;
    display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
    letter-spacing:-0.01em;
    transition: color .25s;
}
.letter-card:hover .letter-card-title { color:var(--primary); }
.letter-card-excerpt {
    color:var(--text-secondary); font-size:14px; line-height:1.7;
    display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden;
    margin-bottom:16px;
}
.letter-card-meta {
    display:flex; align-items:center; gap:6px; flex-wrap:wrap;
    color:var(--text-muted); font-size:12px;
    padding-top:14px; border-top:1px solid var(--border-soft);
}
.letter-card-meta .tag {
    background:var(--primary-light); color:var(--primary);
    padding:3px 11px; border-radius:6px; font-size:11px; font-weight:600;
}
.meta-dot { color:var(--text-muted); opacity:0.6; }
.meta-arrow {
    margin-left:auto; color:var(--primary);
    font-weight:600; opacity:0; transform:translateX(-4px);
    transition: opacity .25s, transform .25s;
}
.letter-card:hover .meta-arrow { opacity:1; transform:translateX(0); }

/* 信件墙顶部统计 */
.wall-stats {
    display:flex; align-items:center; justify-content:center; gap:32px;
    margin:0 auto 48px; padding:20px 32px;
    background:var(--bg-card); border:1px solid var(--border-soft);
    border-radius:var(--radius-lg); box-shadow:var(--shadow-sm);
    max-width:fit-content;
}
.wall-stat-item { display:flex; flex-direction:column; align-items:center; }
.wall-stat-item .num {
    font-family:'Plus Jakarta Sans','Inter',sans-serif;
    font-size:28px; font-weight:800; color:var(--text);
    letter-spacing:-0.02em; line-height:1;
}
.wall-stat-item .lbl {
    font-size:12px; color:var(--text-light); margin-top:6px;
    letter-spacing:0.02em;
}
.wall-stat-divider {
    width:1px; height:32px; background:var(--border);
}
@media (max-width:640px) {
    .wall-stats { gap:16px; padding:16px 20px; }
    .wall-stat-item .num { font-size:22px; }
    .wall-stat-divider { height:24px; }
}
/* ============ 写信表单 ============ */
.write-wrap { max-width:720px; margin:40px auto; padding:0 20px; }
.write-card {
    background:var(--bg-card); border-radius:var(--radius-lg);
    box-shadow:var(--shadow-lg); padding:36px;
    border:1px solid var(--border-soft);
}
.write-card h1 {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-size:26px; margin-bottom:8px; font-weight:800;
    letter-spacing:-0.02em;
}
.write-card .sub { color:var(--text-secondary); margin-bottom:32px; font-size:14px; }

.form-group { margin-bottom:22px; }
.form-label {
    display:block; font-size:14px; font-weight:600;
    color:var(--text); margin-bottom:8px;
}
.form-label .req { color:var(--primary); }
.form-control {
    width:100%; padding:12px 16px; font-size:15px;
    border:1.5px solid var(--border); border-radius:var(--radius);
    background:#fff; transition:var(--transition); color:var(--text);
}
.form-control:focus {
    outline:none; border-color:var(--primary);
    box-shadow:0 0 0 4px var(--primary-ring);
}
textarea.form-control { resize:vertical; min-height:160px; line-height:1.7; }

.channel-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.channel-card {
    padding:16px; border:1.5px solid var(--border); border-radius:var(--radius);
    text-align:center; cursor:pointer; transition:var(--transition); background:#fff;
}
.channel-card:hover { border-color:var(--primary-light); background:var(--bg-soft); }
.channel-card.active {
    border-color:var(--primary); background:var(--primary-light);
    color: var(--primary);
}
.channel-card .ic { margin-bottom:6px; color: var(--text-secondary); display:flex; justify-content:center; }
.channel-card .ic svg { width:24px; height:24px; }
.channel-card.active .ic { color: var(--primary); }
.channel-card .nm { font-size:13px; font-weight:600; }

/* 场景模板卡片 */
.tpl-grid {
    display:grid; grid-template-columns:repeat(auto-fill,minmax(110px,1fr)); gap:12px;
    position:relative;
}
.tpl-card {
    position:relative;
    background:var(--bg-card); border:1.5px solid var(--border); border-radius:var(--radius-sm);
    padding:14px 8px; text-align:center; cursor:pointer;
    transition:var(--transition);
}
.tpl-card:hover { border-color:var(--primary-light); background:var(--bg-soft); transform:translateY(-2px); }
.tpl-card.active {
    border-color:var(--primary); background:var(--primary-light);
    box-shadow:0 4px 12px var(--primary-ring);
}
.tpl-card .ic { margin-bottom:6px; color:var(--text-secondary); display:flex; justify-content:center; }
.tpl-card .ic svg { width:22px; height:22px; }
.tpl-card.active .ic { color:var(--primary); }
.tpl-card .nm { font-size:13px; font-weight:600; }
.tpl-card .del {
    position:absolute; top:4px; right:6px; width:18px; height:18px;
    border-radius:50%; background:rgba(0,0,0,0.05); color:var(--text-light);
    font-size:14px; line-height:16px; text-align:center; cursor:pointer;
    opacity:0; transition:var(--transition);
}
.tpl-card.mine:hover .del { opacity:1; }
.tpl-card .del:hover { background:#fee; color:#e74c3c; }

/* 附件上传 */
.upload-zone {
    border:1.5px dashed var(--border); border-radius:var(--radius);
    padding:24px; text-align:center; transition:var(--transition);
    background:var(--bg-soft); cursor:pointer;
}
.upload-zone:hover, .upload-zone.dragover {
    border-color:var(--primary); background:var(--primary-light);
}
.upload-zone .ic { color:var(--text-light); margin-bottom:8px; display:flex; justify-content:center; }
.upload-zone .ic svg { width:36px; height:36px; }
.upload-zone:hover .ic, .upload-zone.dragover .ic { color: var(--primary); }
.upload-zone p { color:var(--text-secondary); font-size:14px; }
.upload-zone .hint { font-size:12px; color:var(--text-muted); margin-top:6px; }

.attach-list { display:flex; flex-wrap:wrap; gap:10px; margin-top:14px; }
.attach-item {
    position:relative; width:88px; height:88px;
    border-radius:var(--radius-sm); overflow:hidden;
    background:var(--bg-soft);
    display:flex; align-items:center; justify-content:center;
    box-shadow:var(--shadow-sm);
}
.attach-item img { width:100%; height:100%; object-fit:cover; }
.attach-item.video::after {
    content:''; position:absolute; inset:0;
    background:rgba(0,0,0,0.45) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23fff'%3E%3Cpolygon points='6 3 20 12 6 21 6 3'/%3E%3C/svg%3E") center/28px no-repeat;
}
.attach-item .del {
    position:absolute; top:4px; right:4px;
    width:20px; height:20px; border-radius:50%;
    background:rgba(0,0,0,0.65); color:#fff;
    display:flex; align-items:center; justify-content:center;
    font-size:14px; line-height:1;
}

.btn-submit {
    width:100%; padding:16px; font-size:15px; font-weight:700;
    border-radius:var(--radius); color:#fff;
    background:var(--primary); box-shadow:var(--shadow-primary);
    transition:var(--transition); margin-top:12px;
    letter-spacing:-0.01em;
}
.btn-submit:hover {
    background:var(--primary-dark);
    transform:translateY(-1px);
    box-shadow:0 12px 28px rgba(59,130,246,0.35);
}
.btn-submit:disabled { opacity:0.6; cursor:not-allowed; transform:none; }

/* ============ H5 查看页 ============ */
.view-wrap { max-width:680px; margin:40px auto; padding:0 20px; }
.view-card {
    background:#fff;
    border-radius:var(--radius-lg); box-shadow:var(--shadow-lg);
    padding:40px 36px; position:relative; overflow:hidden;
    border:1px solid var(--border-soft);
}
.view-card::before {
    content:''; position:absolute; top:0; left:0; right:0; height:4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
}
.view-meta {
    display:flex; align-items:center; gap:12px; margin-bottom:20px;
    color:var(--text-light); font-size:13px;
}
.view-title {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-size:26px; font-weight:800; margin-bottom:20px; line-height:1.3;
    letter-spacing:-0.02em;
}
.view-content {
    font-size:16px; line-height:1.9; color:var(--text);
    white-space:pre-wrap; word-break:break-word;
    padding:20px 0; border-top:1px solid var(--border-soft); border-bottom:1px solid var(--border-soft);
    margin-bottom:24px;
}
.view-attach-list { display:grid; grid-template-columns:repeat(auto-fill,minmax(120px,1fr)); gap:12px; }
.view-attach-item {
    aspect-ratio:1; border-radius:var(--radius-sm); overflow:hidden;
    background:var(--bg-soft); position:relative; cursor:pointer;
    box-shadow:var(--shadow-sm);
}
.view-attach-item img { width:100%; height:100%; object-fit:cover; }
.view-attach-item .label {
    position:absolute; bottom:0; left:0; right:0;
    padding:4px 8px; background:rgba(0,0,0,0.65); color:#fff;
    font-size:11px; text-align:center;
}

/* ============ Toast ============ */
#toast {
    position:fixed; top:24px; left:50%; transform:translateX(-50%);
    padding:12px 24px; border-radius:var(--radius); font-size:14px; font-weight:500;
    background:var(--accent); color:#fff; z-index:9999;
    box-shadow:var(--shadow-lg); opacity:0; transition:opacity .3s, transform .3s;
    pointer-events:none;
}
#toast.show { opacity:1; transform:translateX(-50%) translateY(0); }
#toast.error { background:#DC2626; }

/* ============ Footer ============ */
.footer {
    background:var(--accent); color:rgba(255,255,255,0.7);
    padding:56px 24px 36px; margin-top:80px;
}
.footer-inner {
    max-width:1200px; margin:0 auto;
    display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px;
}
.footer .logo { color:#fff; }
.footer .logo-icon { background:#fff; color:var(--accent); }
.footer a:hover { color:#fff; }
.footer-links { display:flex; gap:24px; font-size:14px; }
.footer-copy { font-size:13px; opacity:0.7; display:flex; align-items:center; flex-wrap:wrap; gap:6px; }
.footer-copy .footer-sep { opacity:0.5; }
.footer-copy .footer-brand {
    color:#fff; font-weight:600;
    border-bottom:1px solid rgba(255,255,255,0.3);
    transition: border-color .2s;
}
.footer-copy .footer-brand:hover { border-color:#fff; }
.footer-filing {
    display:flex; align-items:center; gap:16px; flex-wrap:wrap;
    padding-top:8px;
}
.filing-link {
    display:inline-flex; align-items:center; gap:6px;
    font-size:12px; opacity:0.65; transition: opacity .2s;
}
.filing-link:hover { opacity:1; }
.filing-icn {
    width:14px; height:14px; display:block;
    border-radius:2px;
}
.filing-mps .filing-icn { width:16px; height:16px; }

/* ============ 滚动渐入动画 ============ */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .6s ease, transform .6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============ 响应式 ============ */
@media (max-width:768px) {
    .navbar-inner { padding:0 16px; }
    .nav-toggle { display:flex; }
    .nav-links {
        position:absolute; top:64px; left:0; right:0;
        flex-direction:column; align-items:stretch; gap:0;
        background:#fff; border-bottom:1px solid var(--border-soft);
        box-shadow:0 8px 24px rgba(15,23,42,0.08);
        padding:8px 16px; max-height:0; overflow:hidden;
        opacity:0; pointer-events:none; transition:all .25s ease;
    }
    .nav-links.show {
        max-height:400px; opacity:1; pointer-events:auto;
    }
    .nav-links a, .nav-links button {
        padding:14px 12px; border-radius:var(--radius);
        font-size:15px; border-bottom:1px solid var(--border-soft);
    }
    .nav-links a:last-child, .nav-links button:last-child { border-bottom:none; }
    .hero { padding:80px 20px 60px; }
    .section { padding:64px 0; }
    .write-card { padding:24px 20px; }
    .channel-grid { grid-template-columns:1fr; }
    .letters-grid { columns:2 150px; }
    .view-card { padding:28px 22px; }
    .float-deco { display:none; }
}
@media (max-width:480px) {
    .letters-grid { columns:1; }
    .hero { padding:60px 16px 48px; }
    .section { padding:48px 0; }
    .login-card { padding:32px 24px; }
    .write-card { padding:20px 16px; }
    .view-card { padding:24px 18px; }
    .container { padding:0 16px; }
    .footer-inner { padding:32px 16px; }
}