/* ==========================================================================
   跨年倒计时 · 样式表
   设计：深空渐变 + 极光光斑 + 玻璃拟态数字卡片 + 金色庆祝字
   ========================================================================== */

:root {
    --bg-deep: #04050d;
    --ink: #e9edff;
    --ink-soft: #a7b0d6;
    --ink-dim: #737ca6;

    --violet: #8b5cf6;
    --indigo: #6366f1;
    --cyan: #22d3ee;
    --pink: #f472b6;
    --gold: #fbbf24;

    --line: rgba(255, 255, 255, 0.10);
    --card: linear-gradient(165deg, rgba(255, 255, 255, 0.10) 0%, rgba(255, 255, 255, 0.03) 48%, rgba(255, 255, 255, 0.06) 100%);
    --radius-lg: 26px;
    --radius-md: 18px;
    --shadow-card: 0 30px 70px -34px rgba(2, 4, 22, 0.95), inset 0 1px 0 rgba(255, 255, 255, 0.14);

    --font-sans: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
    --font-mono: "SF Mono", ui-monospace, "Cascadia Mono", "Roboto Mono", Consolas, monospace;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100vh;
    min-height: 100svh;
    color: var(--ink);
    font-family: var(--font-sans);
    background:
        radial-gradient(1200px 860px at 10% -14%, rgba(96, 63, 224, 0.55), transparent 62%),
        radial-gradient(1050px 760px at 94% -8%, rgba(13, 116, 144, 0.42), transparent 60%),
        radial-gradient(900px 900px at 50% 124%, rgba(233, 76, 160, 0.20), transparent 62%),
        var(--bg-deep);
    background-attachment: fixed;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

[hidden] {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* --------------------------------------------------------------------------
   背景装饰
   -------------------------------------------------------------------------- */

.aurora {
    position: fixed;
    inset: -18vmax;
    z-index: 0;
    pointer-events: none;
    filter: blur(72px);
    opacity: 0.6;
    transition: opacity 1.2s ease;
}

.aurora i {
    position: absolute;
    display: block;
    width: 42vmax;
    height: 42vmax;
    border-radius: 50%;
    mix-blend-mode: screen;
    animation: drift 26s ease-in-out infinite alternate;
}

.aurora i:nth-child(1) {
    top: -6vmax;
    left: 4vmax;
    background: radial-gradient(circle at 40% 40%, rgba(124, 58, 237, 0.85), transparent 66%);
}

.aurora i:nth-child(2) {
    top: 6vmax;
    right: -2vmax;
    background: radial-gradient(circle at 60% 40%, rgba(34, 211, 238, 0.55), transparent 66%);
    animation-duration: 32s;
    animation-delay: -6s;
}

.aurora i:nth-child(3) {
    bottom: -12vmax;
    left: 32vmax;
    background: radial-gradient(circle at 50% 50%, rgba(244, 114, 182, 0.5), transparent 66%);
    animation-duration: 38s;
    animation-delay: -12s;
}

@keyframes drift {
    from {
        transform: translate3d(-3%, 2%, 0) scale(1);
    }
    to {
        transform: translate3d(4%, -3%, 0) scale(1.12);
    }
}

.stars {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.star {
    position: absolute;
    display: block;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 0 6px rgba(255, 255, 255, 0.85);
    opacity: var(--o, 0.6);
    animation: twinkle var(--d, 4s) ease-in-out infinite;
    animation-delay: var(--delay, 0s);
}

@keyframes twinkle {
    0%,
    100% {
        opacity: calc(var(--o, 0.6) * 0.3);
        transform: scale(0.8);
    }
    50% {
        opacity: var(--o, 0.6);
        transform: scale(1.15);
    }
}

.spotlight {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background: radial-gradient(420px circle at var(--mx, 50%) var(--my, 32%), rgba(139, 92, 246, 0.16), transparent 68%);
}

/* 烟花画布：位于内容之下、背景之上 */
#fx {
    position: fixed;
    inset: 0;
    z-index: 2;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* --------------------------------------------------------------------------
   布局
   -------------------------------------------------------------------------- */

.shell {
    position: relative;
    z-index: 3;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100svh;
    padding: clamp(18px, 3.2vw, 40px) clamp(16px, 4vw, 56px) clamp(16px, 2.4vw, 28px);
    gap: clamp(10px, 2vw, 20px);
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    font-size: clamp(0.82rem, 1.4vw, 0.95rem);
    color: var(--ink-soft);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--ink);
    text-decoration: none;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.brand-dot {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: linear-gradient(140deg, var(--gold), var(--pink));
    box-shadow: 0 0 14px rgba(251, 191, 36, 0.9), 0 0 30px rgba(244, 114, 182, 0.55);
    animation: pulse 3.2s ease-in-out infinite;
}

@keyframes pulse {
    0%,
    100% {
        transform: scale(1);
        opacity: 0.9;
    }
    50% {
        transform: scale(1.35);
        opacity: 1;
    }
}

.clock {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 7px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.03);
    font-family: var(--font-mono);
    font-size: 0.86em;
    letter-spacing: 0.04em;
    color: var(--ink-soft);
    white-space: nowrap;
}

.clock-label {
    font-family: var(--font-sans);
    color: var(--ink-dim);
    letter-spacing: 0.1em;
}

.clock time {
    color: #dfe5ff;
    font-variant-numeric: tabular-nums;
}

.main {
    flex: 1;
    display: grid;
    place-items: center;
    padding: clamp(20px, 5vh, 56px) 0;
}

.hero {
    width: min(1120px, 100%);
    display: grid;
    justify-items: center;
    gap: clamp(18px, 3.2vw, 34px);
    text-align: center;
}

.eyebrow {
    margin: 0;
    font-size: clamp(1rem, 2.1vw, 1.32rem);
    letter-spacing: 0.18em;
    text-indent: 0.18em;
    color: var(--ink-soft);
}

.eyebrow .hl {
    color: #fff;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-shadow: 0 0 26px rgba(251, 191, 36, 0.55);
}

/* --------------------------------------------------------------------------
   倒计时数字卡片
   -------------------------------------------------------------------------- */

.countdown {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(10px, 1.8vw, 20px);
    width: 100%;
}

.unit {
    position: relative;
    isolation: isolate;
    display: grid;
    align-content: center;
    gap: 0.4em;
    padding: clamp(16px, 2.4vw, 28px) clamp(6px, 1vw, 16px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    background: var(--card);
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    overflow: hidden;
}

.unit::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: radial-gradient(120% 82% at 50% -8%, rgba(139, 92, 246, 0.34), transparent 70%);
}

.unit::after {
    content: "";
    position: absolute;
    inset: 0 0 auto;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
    opacity: 0.7;
}

.unit-value {
    font-family: var(--font-mono);
    font-size: clamp(2.7rem, 7.2vw, 5.4rem);
    line-height: 1;
    letter-spacing: -0.01em;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum" 1;
}

.unit-label {
    font-size: clamp(0.74rem, 1.3vw, 0.9rem);
    letter-spacing: 0.3em;
    text-indent: 0.3em;
    color: var(--ink-dim);
}

.value {
    display: inline-block;
    background: linear-gradient(180deg, #ffffff 0%, #e4e9ff 40%, #a8b3f0 76%, #8b93d6 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 12px 34px rgba(120, 96, 255, 0.38));
}

.value[data-len="3"] {
    font-size: 0.74em;
}

.value.tick {
    animation: tick 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}

@keyframes tick {
    from {
        transform: translateY(-0.42em);
        opacity: 0.15;
        filter: blur(5px);
    }
    to {
        transform: translateY(0);
        opacity: 1;
        filter: blur(0);
    }
}

.target {
    margin: 0;
    font-size: clamp(0.8rem, 1.5vw, 0.95rem);
    letter-spacing: 0.04em;
    color: var(--ink-dim);
}

.target b {
    font-family: var(--font-mono);
    font-size: 0.96em;
    font-weight: 600;
    color: #cfd7ff;
}

/* --------------------------------------------------------------------------
   年度进度
   -------------------------------------------------------------------------- */

.progress {
    width: min(680px, 100%);
    display: grid;
    gap: 12px;
    padding: clamp(16px, 2vw, 22px) clamp(18px, 2.4vw, 26px);
    border-radius: var(--radius-md);
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.035);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    text-align: left;
}

.progress-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    font-size: clamp(0.78rem, 1.4vw, 0.88rem);
    letter-spacing: 0.08em;
    color: var(--ink-soft);
}

#year-percent {
    font-family: var(--font-mono);
    font-size: 1.02em;
    color: #e6ebff;
    font-variant-numeric: tabular-nums;
}

.bar {
    position: relative;
    height: 9px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.07);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.55);
    overflow: hidden;
}

.bar i {
    display: block;
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--cyan), var(--violet) 58%, var(--pink));
    box-shadow: 0 0 18px rgba(139, 92, 246, 0.8);
    transition: width 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.progress-foot {
    font-size: clamp(0.74rem, 1.3vw, 0.82rem);
    letter-spacing: 0.06em;
    color: var(--ink-dim);
}

.progress-foot b {
    font-family: var(--font-mono);
    color: #dfe5ff;
}

/* --------------------------------------------------------------------------
   跨年庆祝区
   -------------------------------------------------------------------------- */

.celebrate {
    display: grid;
    justify-items: center;
    gap: clamp(10px, 1.6vw, 18px);
    animation: rise 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}

.celebrate-kicker {
    margin: 0;
    font-size: clamp(0.78rem, 1.6vw, 0.95rem);
    letter-spacing: 0.5em;
    text-indent: 0.5em;
    color: var(--gold);
    text-transform: uppercase;
}

.celebrate-year {
    margin: 0;
    font-family: var(--font-mono);
    font-size: clamp(3.6rem, 15vw, 9.5rem);
    line-height: 0.95;
    letter-spacing: -0.02em;
    background: linear-gradient(100deg, #fff 0%, #ffe9a8 24%, var(--gold) 46%, #fff5cf 64%, #fff 100%);
    background-size: 240% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 18px 50px rgba(251, 191, 36, 0.38));
    animation: shimmer 5s linear infinite;
}

.celebrate-title {
    margin: 0;
    font-size: clamp(1.5rem, 4.4vw, 2.6rem);
    font-weight: 700;
    letter-spacing: 0.22em;
    text-indent: 0.22em;
}

.celebrate-sub {
    margin: 0;
    max-width: 30em;
    font-size: clamp(0.86rem, 1.7vw, 1rem);
    line-height: 1.7;
    color: var(--ink-soft);
}

@keyframes shimmer {
    to {
        background-position: 240% 0;
    }
}

@keyframes rise {
    from {
        opacity: 0;
        transform: translateY(22px) scale(0.985);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 6px;
    padding: 13px 26px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    background: linear-gradient(120deg, rgba(139, 92, 246, 0.32), rgba(34, 211, 238, 0.24));
    color: #fff;
    font-size: clamp(0.86rem, 1.5vw, 0.95rem);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-decoration: none;
    box-shadow: 0 18px 36px -18px rgba(96, 63, 224, 0.9);
    transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
}

.btn:hover {
    transform: translateY(-2px);
    background: linear-gradient(120deg, rgba(139, 92, 246, 0.5), rgba(34, 211, 238, 0.34));
    box-shadow: 0 24px 44px -18px rgba(96, 63, 224, 1);
}

.btn:focus-visible {
    outline: 2px solid var(--cyan);
    outline-offset: 3px;
}

body.is-celebrating .aurora {
    opacity: 0.8;
}

/* --------------------------------------------------------------------------
   页脚 / 无脚本提示
   -------------------------------------------------------------------------- */

.footer {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px 10px;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
    color: var(--ink-dim);
    text-align: center;
}

.footer .dot {
    opacity: 0.4;
}

.noscript {
    position: fixed;
    left: 50%;
    bottom: 16px;
    z-index: 9;
    margin: 0;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid rgba(251, 191, 36, 0.4);
    background: rgba(251, 191, 36, 0.14);
    color: #ffe6a8;
    font-size: 0.84rem;
    transform: translateX(-50%);
}

/* --------------------------------------------------------------------------
   响应式
   -------------------------------------------------------------------------- */

@media (max-width: 720px) {
    .countdown {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .unit {
        padding: 14px 8px;
    }

    .unit-value {
        font-size: clamp(2.4rem, 13vw, 3.4rem);
    }
}

@media (max-width: 480px) {
    .clock-label {
        display: none;
    }

    .eyebrow {
        letter-spacing: 0.12em;
        text-indent: 0.12em;
    }

    .progress {
        padding: 14px 16px;
    }

    .footer {
        font-size: 0.72rem;
    }
}

/* 降低动效偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }

    .value.tick {
        animation: none;
    }

    .celebrate {
        animation: none;
    }
}