/* AI生成 */
/* ============================================
   尊划算 — Apple 风格设计系统
   ============================================ */

:root {
    --color-bg: #ffffff;
    --color-bg-gray: #f5f5f7;
    --color-text: #1d1d1f;
    --color-text-secondary: #86868b;
    --color-blue: #0071e3;
    --color-blue-hover: #0077ed;
    --color-green: #34c759;
    --color-red: #e3322b;
    --color-border: #d2d2d7;
    --nav-height: 48px;
    --radius: 18px;
    --radius-sm: 12px;
    --radius-xs: 8px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.1);
    --max-width: 980px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--color-text); background: var(--color-bg); line-height: 1.5; overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ---- 导航栏 ---- */
.nav { position: sticky; top: 0; z-index: 1000; height: var(--nav-height); background: rgba(255,255,255,0.8); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid rgba(0,0,0,0.08); transition: background var(--transition); }
.nav-inner { max-width: var(--max-width); margin: 0 auto; height: 100%; display: flex; align-items: center; justify-content: space-between; padding: 0 22px; }
.nav-logo { font-size: 17px; font-weight: 600; letter-spacing: -0.02em; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { font-size: 14px; opacity: 0.88; transition: opacity var(--transition); }
.nav-links a:hover { opacity: 1; }
.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-toggle span { width: 18px; height: 2px; background: var(--color-text); border-radius: 1px; }

/* ---- Hero ---- */
.hero { text-align: center; padding: 120px 22px 80px; max-width: var(--max-width); margin: 0 auto; }
.hero-title { font-size: clamp(40px,8vw,80px); font-weight: 700; letter-spacing: -0.03em; line-height: 1.08; margin-bottom: 20px; background: linear-gradient(180deg,#1d1d1f 0%,#434343 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { font-size: clamp(18px,3vw,28px); color: var(--color-text-secondary); line-height: 1.4; margin-bottom: 40px; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---- 按钮 ---- */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 24px; border-radius: 980px; font-size: 16px; font-weight: 400; border: none; cursor: pointer; transition: all var(--transition); white-space: nowrap; font-family: inherit; }
.btn-primary { background: var(--color-blue); color: #fff; }
.btn-primary:hover { background: var(--color-blue-hover); }
.btn-secondary { background: transparent; color: var(--color-blue); border: 1px solid var(--color-blue); }
.btn-secondary:hover { background: rgba(0,113,227,0.06); }
.btn-outline { background: transparent; color: var(--color-blue); border: 1px solid var(--color-border); }
.btn-outline:hover { background: var(--color-bg-gray); border-color: var(--color-text-secondary); }
.btn-link { background: transparent; color: var(--color-blue); padding: 8px 0; font-size: 14px; }
.btn-link:hover { opacity: 0.7; }
.btn-sm { padding: 8px 16px; font-size: 14px; }
.btn-lg { padding: 14px 32px; font-size: 17px; }

/* ---- 统计条 ---- */
.stats-bar { padding: 40px 22px; border-top: 1px solid rgba(0,0,0,0.06); border-bottom: 1px solid rgba(0,0,0,0.06); }
.stats-inner { max-width: var(--max-width); margin: 0 auto; display: flex; justify-content: space-around; flex-wrap: wrap; gap: 24px; }
.stat-item { text-align: center; }
.stat-num { font-size: clamp(28px,4vw,40px); font-weight: 700; color: var(--color-text); letter-spacing: -0.02em; }
.stat-label { font-size: 14px; color: var(--color-text-secondary); margin-top: 4px; }

/* ---- Section ---- */
.section { padding: 80px 22px; max-width: var(--max-width); margin: 0 auto; }
.section-gray { background: var(--color-bg-gray); max-width: none; padding-left: 22px; padding-right: 22px; }
.section-gray > * { max-width: var(--max-width); margin-left: auto; margin-right: auto; }
.section-teaser { text-align: center; }
.section-header { text-align: center; margin-bottom: 56px; }
.section-tag { display: inline-block; font-size: 14px; font-weight: 600; color: var(--color-blue); margin-bottom: 8px; }
.section-title { font-size: clamp(32px,5vw,56px); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 12px; }
.section-desc { font-size: clamp(16px,2vw,21px); color: var(--color-text-secondary); max-width: 600px; margin: 0 auto; }

/* ---- 卡片 ---- */
.card { background: var(--color-bg); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-card); transition: transform var(--transition), box-shadow var(--transition); }
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-card-hover); }
.card-feature { max-width: 680px; margin: 0 auto 32px; }
.card-feature-header { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.card-icon-wrap { width: 48px; height: 48px; border-radius: var(--radius-sm); background: var(--color-bg-gray); display: flex; align-items: center; justify-content: center; color: var(--color-text); }
.card-icon-svg { width: 24px; height: 24px; }
.card-feature-header h3 { font-size: 28px; font-weight: 600; letter-spacing: -0.01em; }
.card-desc { font-size: 17px; color: var(--color-text-secondary); margin-bottom: 24px; line-height: 1.5; }

/* ---- 转链 ---- */
.link-converter { background: var(--color-bg-gray); border-radius: var(--radius-sm); padding: 24px; margin-bottom: 24px; }
.input-group { display: flex; gap: 12px; }
.input { flex: 1; padding: 12px 16px; border: 1px solid var(--color-border); border-radius: var(--radius-sm); font-size: 16px; font-family: inherit; outline: none; transition: border-color var(--transition), box-shadow var(--transition); background: #fff; color: var(--color-text); }
.input:focus { border-color: var(--color-blue); box-shadow: 0 0 0 3px rgba(0,113,227,0.1); }
.input::placeholder { color: var(--color-text-secondary); }
.textarea { resize: vertical; min-height: 100px; width: 100%; }
.convert-result { margin-top: 16px; padding: 20px; background: #fff; border-radius: var(--radius-sm); border: 1px solid var(--color-border); animation: slideDown 0.3s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
.result-platform { font-size: 14px; color: var(--color-text-secondary); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.result-platform-badge { display: inline-flex; align-items: center; padding: 2px 10px; border-radius: 980px; font-size: 12px; font-weight: 600; color: #fff; }
.result-link { word-break: break-all; color: var(--color-blue); font-size: 14px; padding: 12px; background: var(--color-bg-gray); border-radius: var(--radius-xs); margin-bottom: 16px; font-family: "SF Mono","Fira Code",monospace; }
.result-info { display: flex; gap: 32px; flex-wrap: wrap; }
.result-info-item { text-align: center; }
.result-info-item .label { font-size: 12px; color: var(--color-text-secondary); margin-bottom: 4px; }
.result-info-item .value { font-size: 24px; font-weight: 700; color: var(--color-red); }
.result-notice { margin-top: 16px; padding: 8px 12px; font-size: 12px; color: var(--color-text-secondary); background: rgba(0,113,227,0.04); border-radius: var(--radius-xs); }
.convert-loading { margin-top: 16px; display: flex; align-items: center; justify-content: center; gap: 12px; color: var(--color-text-secondary); font-size: 14px; }
.spinner { width: 20px; height: 20px; border: 2px solid var(--color-border); border-top-color: var(--color-blue); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- 步骤 ---- */
.feature-steps { display: flex; gap: 20px; flex-wrap: wrap; }
.step { display: flex; align-items: center; gap: 8px; }
.step-num { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; border-radius: 50%; background: var(--color-blue); color: #fff; font-size: 13px; font-weight: 600; flex-shrink: 0; }
.step-text { font-size: 14px; color: var(--color-text-secondary); }

/* ---- 卡片网格 ---- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.card-app { display: flex; flex-direction: column; }
.card-app-header { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.app-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 28px; font-weight: 700; color: #fff; flex-shrink: 0; }
.app-icon-douyin { background: #000; }
.app-icon-kuaishou { background: #ff6b00; }
.app-icon-xigua { background: #e8322b; }
.app-icon-qishui { background: #00d4aa; }
.app-icon-pdd { background: #e02e24; }
.card-app-header h3 { font-size: 20px; font-weight: 600; }
.app-tag { font-size: 13px; color: var(--color-text-secondary); }
.feature-list { margin: 16px 0 20px; flex: 1; }
.feature-list li { padding: 6px 0; font-size: 15px; color: var(--color-text-secondary); position: relative; padding-left: 22px; }
.feature-list li::before { content: ""; position: absolute; left: 0; top: 13px; width: 14px; height: 8px; border-left: 2px solid var(--color-green); border-bottom: 2px solid var(--color-green); transform: rotate(-45deg); }

/* ---- 卡片底部（攻略 + 点赞） ---- */
.card-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; }

/* ---- 点赞按钮 ---- */
.like-btn-wrap { display: inline-flex; }
.like-btn { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; border: 1px solid var(--color-border); border-radius: 980px; background: transparent; cursor: pointer; font-size: 14px; color: var(--color-text-secondary); transition: all var(--transition); font-family: inherit; }
.like-btn:hover { border-color: var(--color-red); color: var(--color-red); }
.like-btn.active { border-color: var(--color-red); color: var(--color-red); background: rgba(227,50,43,0.06); }
.like-btn.active svg { fill: var(--color-red); }
.like-btn svg { width: 18px; height: 18px; transition: fill var(--transition); }
.like-count { font-weight: 600; min-width: 12px; text-align: center; }

/* ---- 占位卡片 ---- */
.card-placeholder { display: flex; align-items: center; justify-content: center; min-height: 200px; border: 2px dashed var(--color-border); background: transparent; box-shadow: none; transition: border-color var(--transition); }
.card-placeholder:hover { border-color: var(--color-blue); transform: none; box-shadow: none; }
.placeholder-content { text-align: center; color: var(--color-text-secondary); }
.placeholder-icon { font-size: 32px; font-weight: 300; display: block; margin-bottom: 8px; }

/* ---- 社区方法 ---- */
.community-group { margin-bottom: 40px; }
.community-group-title { font-size: 22px; font-weight: 600; margin-bottom: 20px; }
.community-empty { text-align: center; padding: 40px; color: var(--color-text-secondary); font-size: 16px; }
.community-card { display: flex; flex-direction: column; }
.community-card .card-desc { flex: 1; }
.community-meta { font-size: 13px; color: var(--color-text-secondary); margin-top: 12px; display: flex; gap: 16px; flex-wrap: wrap; }

/* ---- 即将上线 ---- */
.teaser-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 24px; max-width: var(--max-width); margin: 0 auto; }
.teaser-item { text-align: center; padding: 32px 20px; }
.teaser-icon { width: 48px; height: 48px; margin: 0 auto 16px; color: var(--color-text-secondary); }
.teaser-icon svg { width: 100%; height: 100%; }
.teaser-item h4 { font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.teaser-item p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.5; }

/* ---- Tab 切换 ---- */
.contribute-tabs { display: flex; justify-content: center; gap: 8px; margin-bottom: 32px; }
.tab-btn { padding: 10px 24px; border: 1px solid var(--color-border); border-radius: 980px; background: transparent; font-size: 15px; cursor: pointer; transition: all var(--transition); font-family: inherit; color: var(--color-text-secondary); }
.tab-btn:hover { border-color: var(--color-text-secondary); color: var(--color-text); }
.tab-btn.active { background: var(--color-text); color: #fff; border-color: var(--color-text); }
.tab-content { max-width: 600px; margin: 0 auto; }

/* ---- 表单 ---- */
.contribute-form { background: var(--color-bg-gray); border-radius: var(--radius); padding: 40px; }
.form-row { margin-bottom: 24px; }
.form-label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; }
.form-radio-group { display: flex; gap: 24px; flex-wrap: wrap; }
.radio-label { display: flex; align-items: center; gap: 6px; font-size: 16px; cursor: pointer; }
.radio-label input[type="radio"] { width: 18px; height: 18px; accent-color: var(--color-blue); }
.form-actions { text-align: center; }
.contrib-success { text-align: center; padding: 60px 40px; background: var(--color-bg-gray); border-radius: var(--radius); animation: fadeIn 0.4s ease; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.success-icon { width: 64px; height: 64px; border-radius: 50%; background: var(--color-green); color: #fff; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; }
.success-icon svg { width: 28px; height: 28px; }
.contrib-success h3 { font-size: 24px; margin-bottom: 8px; }
.contrib-success p { color: var(--color-text-secondary); line-height: 1.6; }

/* ---- 关于 ---- */
.about-content { max-width: 600px; margin: 0 auto; text-align: center; }
.about-content > p { font-size: 18px; color: var(--color-text-secondary); line-height: 1.6; margin-bottom: 32px; }
.about-list { text-align: left; display: grid; gap: 16px; }
.about-list li { font-size: 16px; color: var(--color-text-secondary); padding-left: 24px; position: relative; }
.about-list li::before { content: ""; position: absolute; left: 0; top: 8px; width: 12px; height: 7px; border-left: 2px solid var(--color-green); border-bottom: 2px solid var(--color-green); transform: rotate(-45deg); }
.about-list li strong { color: var(--color-text); font-weight: 600; }

/* ---- 页脚 ---- */
.footer { border-top: 1px solid var(--color-border); padding: 40px 22px; }
.footer-inner { max-width: var(--max-width); margin: 0 auto; text-align: center; }
.footer-title { font-size: 16px; font-weight: 600; color: var(--color-text); }
.footer-sub { font-size: 13px; color: var(--color-text-secondary); margin-top: 4px; }
.footer-copy { font-size: 12px; color: var(--color-text-secondary); margin-top: 16px; opacity: 0.6; }

/* ---- 弹窗 ---- */
.modal { position: fixed; inset: 0; z-index: 2000; display: flex; align-items: center; justify-content: center; padding: 22px; }
.modal-overlay { position: absolute; inset: 0; background: rgba(0,0,0,0.5); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.modal-content { position: relative; background: #fff; border-radius: var(--radius); max-width: 500px; width: 100%; max-height: 80vh; overflow-y: auto; padding: 40px; animation: modalIn 0.3s ease; }
@keyframes modalIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }
.modal-close { position: absolute; top: 16px; right: 16px; width: 32px; height: 32px; border: none; background: var(--color-bg-gray); border-radius: 50%; font-size: 20px; cursor: pointer; color: var(--color-text-secondary); display: flex; align-items: center; justify-content: center; transition: background var(--transition); }
.modal-close:hover { background: var(--color-border); }
.modal-body-title { font-size: 24px; font-weight: 700; margin-bottom: 16px; }
.modal-body-desc { font-size: 16px; color: var(--color-text-secondary); line-height: 1.6; margin-bottom: 24px; }
.modal-body-list { display: grid; gap: 12px; }
.modal-body-list li { padding: 12px 16px; background: var(--color-bg-gray); border-radius: var(--radius-sm); font-size: 15px; }
.modal-body-notice { margin-top: 24px; padding: 16px; background: rgba(0,113,227,0.05); border-radius: var(--radius-sm); font-size: 14px; color: var(--color-text-secondary); text-align: center; }

/* ---- 滚动动画 ---- */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.7s ease, transform 0.7s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ---- 响应式 ---- */
@media (max-width: 734px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; }
    .nav-links.open { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: rgba(255,255,255,0.95); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); padding: 16px 22px; gap: 16px; border-bottom: 1px solid var(--color-border); }
    .hero { padding: 80px 22px 60px; }
    .hero-cta { flex-direction: column; align-items: center; }
    .hero-cta .btn { width: 100%; max-width: 280px; }
    .input-group { flex-direction: column; }
    .feature-steps { flex-direction: column; gap: 12px; }
    .card { padding: 24px; }
    .contribute-form { padding: 24px; }
    .stats-inner { gap: 20px; }
    .stat-item { min-width: 45%; }
    .modal-content { padding: 28px; }
    .card-footer { flex-direction: column; align-items: stretch; }
}
@media (max-width: 400px) {
    .card-grid { grid-template-columns: 1fr; }
    .teaser-grid { grid-template-columns: 1fr; }
}