:root {
    --tt-bg: #0f172a;
    --tt-card: #1e293b;
    --tt-card-hi: #2a3a52;
    --tt-border: #334155;
    --tt-text: #e2e8f0;
    --tt-text-mute: #94a3b8;
    --tt-accent: #818cf8;
    --tt-accent-solid: #6366f1;
    --tt-accent-bg: rgba(99,102,241,0.15);
    --tt-success: #34d399;
    --tt-danger: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
    background: var(--tt-bg); color: var(--tt-text); min-height: 100vh;
}
.tt-fullscreen { min-height: 100vh; display: flex; flex-direction: column; }
.tt-header {
    background: rgba(15,23,42,0.85); backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--tt-border); height: 56px;
    padding: 0 16px; display: flex; align-items: center; gap: 12px;
    position: sticky; top: 0; z-index: 100;
}
.tt-back { color: var(--tt-text-mute); text-decoration: none; display: inline-flex; align-items: center; gap: 6px; font-size: 14px; }
.tt-back:hover { color: var(--tt-text); }
.tt-title { font-size: 16px; font-weight: 600; }
.tt-spacer { flex: 1; }

.tt-main { flex: 1; padding: 24px 16px 60px; max-width: 880px; width: 100%; margin: 0 auto; }
.tt-card { background: var(--tt-card); border: 1px solid var(--tt-border); border-radius: 16px; padding: 22px; }

.tt-tabs {
    display: flex; gap: 4px; background: var(--tt-bg);
    border: 1px solid var(--tt-border); border-radius: 10px;
    padding: 4px; margin-bottom: 20px;
}
.tt-tab {
    flex: 1; background: transparent; color: var(--tt-text-mute);
    border: none; padding: 9px 8px; border-radius: 7px; cursor: pointer;
    font-size: 14px; font-family: inherit;
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
}
.tt-tab:hover { color: var(--tt-text); }
.tt-tab.active { background: var(--tt-accent-bg); color: var(--tt-accent); font-weight: 500; }

.tt-pane.hidden { display: none; }

.tt-row { margin-bottom: 14px; }
.tt-row-inline { display: flex; gap: 8px; }
.tt-label { display: block; font-size: 13px; color: var(--tt-text-mute); margin-bottom: 6px; }

.tt-input {
    width: 100%; padding: 11px 14px; border-radius: 8px;
    background: var(--tt-bg); border: 1px solid var(--tt-border);
    color: var(--tt-text); font-size: 14px; font-family: inherit;
    outline: none; transition: border-color .15s, box-shadow .15s;
}
.tt-input:focus { border-color: var(--tt-accent-solid); box-shadow: 0 0 0 3px var(--tt-accent-bg); }
.tt-input[type="datetime-local"] { color-scheme: dark; }
.tt-input[type="datetime-local"]::-webkit-calendar-picker-indicator { cursor: pointer; opacity: 0.7; }

select.tt-input { cursor: pointer; }

.tt-btn {
    background: transparent; color: var(--tt-text);
    border: 1px solid var(--tt-border); padding: 9px 14px;
    border-radius: 8px; cursor: pointer; font-size: 13px; font-family: inherit;
    display: inline-flex; align-items: center; gap: 6px; white-space: nowrap;
}
.tt-btn:hover { background: var(--tt-card-hi); border-color: var(--tt-accent-solid); }
.tt-btn-primary { background: var(--tt-accent-solid); color: #fff; border-color: var(--tt-accent-solid); }
.tt-btn-primary:hover { background: var(--tt-accent); }
.tt-btn-mini { padding: 5px 10px; font-size: 12px; }

/* 倒计时 */
.tt-cd-display {
    background: linear-gradient(180deg, var(--tt-card-hi), var(--tt-card));
    border: 1px solid var(--tt-border); border-radius: 12px;
    padding: 24px; margin: 20px 0 16px;
    text-align: center;
}
.tt-cd-title { font-size: 18px; color: var(--tt-text); margin-bottom: 14px; font-weight: 500; }
.tt-cd-blocks { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.tt-cd-block {
    background: var(--tt-bg); border: 1px solid var(--tt-border);
    border-radius: 10px; padding: 14px 16px; min-width: 80px;
}
.tt-cd-num {
    font-size: 36px; font-weight: 700; color: var(--tt-accent);
    font-variant-numeric: tabular-nums; line-height: 1;
}
.tt-cd-unit { font-size: 12px; color: var(--tt-text-mute); margin-top: 4px; }
.tt-cd-sub { margin-top: 14px; font-size: 13px; color: var(--tt-text-mute); }
.tt-cd-display.expired .tt-cd-num { color: var(--tt-text-mute); }
.tt-cd-display.expired .tt-cd-sub { color: var(--tt-success); }

.tt-cd-presets { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.tt-cd-presets-label { font-size: 13px; color: var(--tt-text-mute); }
.tt-chip {
    background: transparent; color: var(--tt-text-mute);
    border: 1px solid var(--tt-border); padding: 5px 12px;
    border-radius: 999px; cursor: pointer; font-size: 12px; font-family: inherit;
}
.tt-chip:hover { color: var(--tt-text); border-color: var(--tt-accent-solid); }

/* 世界时钟 */
.tt-clock-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px; margin-bottom: 16px;
}
.tt-clock-card {
    background: linear-gradient(180deg, var(--tt-card-hi), var(--tt-card));
    border: 1px solid var(--tt-border); border-radius: 10px;
    padding: 14px 16px;
}
.tt-clock-zone {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 8px;
}
.tt-clock-name { font-size: 13px; color: var(--tt-text-mute); }
.tt-clock-del {
    background: none; border: none; color: var(--tt-text-mute);
    cursor: pointer; padding: 0 4px; font-size: 14px;
}
.tt-clock-del:hover { color: var(--tt-danger); }
.tt-clock-time {
    font-size: 28px; font-weight: 600; color: var(--tt-accent);
    font-variant-numeric: tabular-nums; line-height: 1.1;
}
.tt-clock-date { font-size: 12px; color: var(--tt-text-mute); margin-top: 4px; }
.tt-clock-add {
    display: flex; gap: 8px;
    background: var(--tt-bg); border: 1px dashed var(--tt-border);
    border-radius: 10px; padding: 12px;
}
.tt-clock-add .tt-input { flex: 1; }

/* 时区转换 */
.tt-tz-from .tt-row-inline .tt-input:first-child { flex: 1.2; }
.tt-tz-from .tt-row-inline select { flex: 1; }
.tt-tz-arrow {
    text-align: center; color: var(--tt-text-mute);
    font-size: 22px; margin: 8px 0;
}
.tt-tz-targets { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.tt-tz-target {
    display: flex; justify-content: space-between; align-items: center;
    padding: 12px 16px; gap: 12px;
    background: var(--tt-card-hi); border: 1px solid var(--tt-border);
    border-radius: 10px;
}
.tt-tz-target-zone { flex: 0 0 200px; font-size: 13px; color: var(--tt-text-mute); }
.tt-tz-target-time {
    font-size: 18px; font-weight: 600; color: var(--tt-accent);
    font-family: 'Menlo', 'Consolas', monospace; font-variant-numeric: tabular-nums;
    flex: 1; text-align: right;
}
.tt-tz-target-del {
    background: none; border: none; color: var(--tt-text-mute);
    cursor: pointer; padding: 0 6px; font-size: 14px;
}
.tt-tz-target-del:hover { color: var(--tt-danger); }
.tt-tz-add { display: flex; gap: 8px; background: var(--tt-bg); border: 1px dashed var(--tt-border); border-radius: 10px; padding: 12px; }
.tt-tz-add .tt-input { flex: 1; }

.tt-foot { margin-top: 16px; color: var(--tt-text-mute); font-size: 12px; }
.tt-seo {
    margin-top: 32px; padding: 20px 24px;
    background: var(--tt-card); border: 1px solid var(--tt-border);
    border-radius: 12px; color: var(--tt-text-mute); font-size: 14px; line-height: 1.7;
}
.tt-seo h2 { color: var(--tt-text); font-size: 16px; margin-bottom: 10px; }
.tt-seo b { color: var(--tt-text); font-weight: 500; }

@media (max-width: 540px) {
    .tt-card { padding: 16px; }
    .tt-tab { font-size: 13px; padding: 8px 4px; }
    .tt-cd-num { font-size: 28px; }
    .tt-cd-block { min-width: 64px; padding: 12px; }
    .tt-row-inline { flex-direction: column; }
    .tt-tz-target { flex-direction: column; align-items: flex-start; }
    .tt-tz-target-time { text-align: left; width: 100%; }
}