/* ==========================================
   日期时间计算工具 · 专属样式
   迪妙网络空间安全学院 · 纯前端本地运行
   ========================================== */

/* ===== 页面头部 ===== */
.page-header {
    padding: 140px 0 36px;
    background: linear-gradient(180deg, #f0f5ff 0%, #ffffff 100%);
    text-align: center;
}
.page-header h1 {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 900;
    color: var(--text);
    margin-bottom: 12px;
}
.page-header p {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 680px;
    margin: 0 auto 20px;
    line-height: 1.8;
}
.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--text-light);
    flex-wrap: wrap;
}
.breadcrumb a { color: var(--primary); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { text-decoration: underline; }
.tool-meta {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}
.meta-chip {
    font-size: 12px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 100px;
    background: var(--primary-light);
    color: var(--primary);
    border: 1px solid rgba(26,110,255,0.15);
}

/* ===== Tab 导航栏 ===== */
.tabbar-wrap {
    position: sticky;
    top: 72px;
    z-index: 100;
    background: rgba(255,255,255,0.94);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
.tabbar {
    display: flex;
    gap: 8px;
    padding: 12px 0;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}
.tabbar::-webkit-scrollbar { display: none; }
.tab-btn {
    flex-shrink: 0;
    padding: 9px 18px;
    border-radius: 100px;
    border: 1.5px solid var(--border);
    background: white;
    font-family: inherit;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}
.tab-btn:hover { border-color: var(--primary); color: var(--primary); }
.tab-btn.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 14px rgba(26,110,255,0.3);
}

/* ===== 主区域与面板 ===== */
.tool-main { padding: 40px 0 80px; min-height: 60vh; }
.tool-panel { display: none; animation: panelIn 0.35s ease; }
.tool-panel.active { display: block; }
@keyframes panelIn {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}
.panel-head {
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}
.panel-head h2 { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.panel-head p { font-size: 14px; color: var(--text-secondary); line-height: 1.8; }
.panel-body {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
}
.sub-block {
    margin-top: 36px;
    padding-top: 28px;
    border-top: 1px dashed var(--border);
}
.sub-block h3 { font-size: 16px; font-weight: 700; margin-bottom: 16px; }

/* ===== 表单 ===== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.form-item label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}
.form-item input,
.form-item select,
.form-item textarea {
    width: 100%;
    padding: 11px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
    color: var(--text);
    background: white;
    transition: var(--transition);
}
.form-item input:focus,
.form-item select:focus,
.form-item textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,110,255,0.12);
}
.form-item input:disabled { background: var(--bg-warm); color: var(--text-light); }
.form-item textarea { resize: vertical; min-height: 74px; line-height: 1.7; }
.form-item input[type="date"],
.form-item input[type="datetime-local"] { cursor: pointer; }

/* ===== 按钮 ===== */
.btn-row {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}
.tool-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 11px 24px;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}
.tool-btn.primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(26,110,255,0.3);
}
.tool-btn.primary:hover { transform: translateY(-2px); box-shadow: 0 6px 22px rgba(26,110,255,0.4); }
.tool-btn.ghost {
    background: white;
    color: var(--text-secondary);
    border: 1.5px solid var(--border);
}
.tool-btn.ghost:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-light); }

/* ===== 结果卡片 ===== */
.result-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 14px;
}
.result-placeholder {
    grid-column: 1 / -1;
    text-align: center;
    padding: 32px 16px;
    font-size: 13px;
    color: var(--text-light);
    background: var(--bg-warm);
    border: 1.5px dashed var(--border);
    border-radius: var(--radius-sm);
}
.result-card {
    background: var(--bg-warm);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px 16px;
    text-align: center;
    transition: var(--transition);
    animation: cardIn 0.35s ease backwards;
}
.result-card:hover { border-color: rgba(26,110,255,0.3); box-shadow: var(--shadow); }
@keyframes cardIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.result-card .rc-label { font-size: 12px; color: var(--text-light); margin-bottom: 6px; }
.result-card .rc-value {
    font-size: 26px;
    font-weight: 900;
    color: var(--primary);
    line-height: 1.2;
    word-break: break-all;
}
.result-card .rc-value.small { font-size: 16px; font-weight: 700; }
.result-card .rc-unit { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }
.result-card.wide { grid-column: 1 / -1; text-align: left; }
.result-card.wide .rc-value { font-size: 16px; font-weight: 700; line-height: 1.8; }
.result-line { font-size: 13px; color: var(--text-secondary); line-height: 2; }
.result-line strong { color: var(--text); font-weight: 700; }

/* ===== 倒计时 ===== */
.countdown-display {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    border-radius: var(--radius);
    padding: 40px 32px;
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}
.countdown-display::before {
    content: '';
    position: absolute;
    top: -50%; right: -20%;
    width: 380px; height: 380px;
    background: radial-gradient(circle, rgba(26,110,255,0.15) 0%, transparent 70%);
    border-radius: 50%;
}
.cd-title { font-size: 16px; font-weight: 700; margin-bottom: 24px; position: relative; z-index: 1; }
.cd-digits {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    position: relative;
    z-index: 1;
    flex-wrap: wrap;
}
.cd-cell {
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 14px;
    padding: 14px 10px;
    min-width: 82px;
}
.cd-cell span {
    display: block;
    font-size: 40px;
    font-weight: 900;
    font-variant-numeric: tabular-nums;
    line-height: 1;
}
.cd-cell label { font-size: 12px; color: rgba(255,255,255,0.5); margin-top: 6px; display: block; }
.cd-sep { font-size: 32px; font-weight: 900; color: rgba(255,255,255,0.3); }
.cd-progress {
    margin: 26px auto 0;
    max-width: 480px;
    height: 6px;
    background: rgba(255,255,255,0.1);
    border-radius: 100px;
    overflow: hidden;
    position: relative;
    z-index: 1;
}
.cd-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #ff6b35 0%, #ff4757 100%);
    border-radius: 100px;
    transition: width 1s linear;
}
.cd-sub { margin-top: 14px; font-size: 13px; color: rgba(255,255,255,0.55); position: relative; z-index: 1; }

/* ===== 世界时钟 ===== */
.world-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 16px;
}
.world-card {
    background: var(--bg-warm);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: var(--transition);
}
.world-card:hover { border-color: rgba(26,110,255,0.3); box-shadow: var(--shadow); }
.world-card.is-local { border-color: rgba(26,110,255,0.4); background: var(--primary-light); }
.world-flag { font-size: 30px; flex-shrink: 0; }
.world-info { flex: 1; min-width: 0; }
.world-city { font-size: 14px; font-weight: 700; }
.world-zone { font-size: 11px; color: var(--text-light); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.world-time { font-size: 19px; font-weight: 900; color: var(--primary); font-variant-numeric: tabular-nums; }
.world-diff { font-size: 11px; font-weight: 600; flex-shrink: 0; }
.world-diff.same { color: var(--text-light); }
.world-diff.ahead { color: #16a34a; }
.world-diff.behind { color: #ff6b35; }
.world-note {
    margin-top: 18px;
    font-size: 12px;
    color: var(--text-light);
    text-align: center;
}

/* ===== 响应式（与官网断点一致） ===== */
@media (max-width: 1024px) {
    .page-header { padding: 120px 0 32px; }
    .panel-body { padding: 24px 20px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    /* 顶部导航：汉堡菜单（照抄官网 index.html 内联规则） */
    .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0; right: 0;
        background: white;
        flex-direction: column;
        padding: 16px 24px;
        box-shadow: 0 8px 24px rgba(0,0,0,0.08);
        gap: 4px;
        border-bottom: 1px solid var(--border);
    }
    .nav-links.active { display: flex; }
    .mobile-toggle { display: flex; }

    .page-header { padding: 104px 0 28px; }
    .page-header p { font-size: 14px; }
    .breadcrumb { font-size: 12px; }

    .tabbar-wrap { top: 72px; }
    .tabbar { padding: 10px 0; }
    .tab-btn { padding: 8px 14px; font-size: 12px; }

    .tool-main { padding: 28px 0 60px; }
    .panel-head h2 { font-size: 19px; }
    .panel-body { padding: 20px 16px; border-radius: 12px; }
    .form-grid { grid-template-columns: 1fr; gap: 14px; }
    .btn-row { gap: 8px; }
    .tool-btn { padding: 10px 18px; font-size: 13px; flex: 1; justify-content: center; min-width: 120px; }
    .result-cards { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .result-card { padding: 14px 10px; }
    .result-card .rc-value { font-size: 21px; }

    .countdown-display { padding: 28px 16px; }
    .cd-cell { min-width: 64px; padding: 10px 6px; }
    .cd-cell span { font-size: 28px; }
    .cd-sep { font-size: 22px; }

    .world-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .world-card { padding: 12px; gap: 10px; }
    .world-flag { font-size: 24px; }
    .world-time { font-size: 15px; }

    /* 页脚：单列（照抄官网） */
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 480px) {
    .result-cards { grid-template-columns: 1fr 1fr; }
    .world-grid { grid-template-columns: 1fr; }
    .cd-cell { min-width: 56px; }
    .cd-cell span { font-size: 24px; }
}