:root {
    --bg1: #b7e6ff;
    --bg2: #ffe0c4;
    --bg3: #f8ccdd;
    --text: #1c2a43;
    --text-soft: #5a6f8f;
    --shell: rgba(255, 255, 255, 0.56);
    --shell-border: rgba(255, 255, 255, 0.86);
    --shell-shadow: 0 24px 50px rgba(18, 32, 52, 0.28);
    --btn-bg: rgba(255, 255, 255, 0.8);
    --btn-border: rgba(255, 255, 255, 0.9);
    --primary: linear-gradient(135deg, #2f87ff, #31c5a4);
    --danger: #ff6d7d;
    --mono: "JetBrains Mono", "Consolas", monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg1: #0f1727;
        --bg2: #1f2d48;
        --bg3: #39283f;
        --text: #e8f0ff;
        --text-soft: #9fb2d4;
        --shell: rgba(20, 30, 47, 0.58);
        --shell-border: rgba(130, 158, 198, 0.28);
        --shell-shadow: 0 26px 54px rgba(0, 0, 0, 0.44);
        --btn-bg: rgba(35, 47, 69, 0.74);
        --btn-border: rgba(125, 151, 191, 0.3);
        --danger: #ff8a96;
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    min-height: 100%;
}

body {
    margin: 0;
    font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 10% 10%, rgba(255, 255, 255, 0.42), transparent 34%),
        radial-gradient(circle at 88% 18%, rgba(255, 255, 255, 0.26), transparent 30%),
        linear-gradient(130deg, var(--bg1), var(--bg2) 52%, var(--bg3));
}

.timer-page {
    width: min(980px, 94vw);
    margin: 20px auto;
    display: grid;
    gap: 12px;
}

.back-link {
    justify-self: start;
    text-decoration: none;
    border-radius: 999px;
    padding: 7px 13px;
    border: 1px solid var(--shell-border);
    background: var(--btn-bg);
    color: var(--text);
    font-weight: 700;
    font-size: 13px;
}

.timer-shell {
    --danger-ratio: 0;
    position: relative;
    overflow: hidden;
    border-radius: 24px;
    border: 1px solid var(--shell-border);
    background: var(--shell);
    box-shadow: var(--shell-shadow);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    padding: clamp(16px, 3vw, 28px);
}

.timer-shell::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 80% 10%, rgba(255, 255, 255, 0.22), transparent 38%);
    pointer-events: none;
}

.timer-head {
    position: relative;
    z-index: 1;
}

.timer-head h1 {
    margin: 0;
    font-size: clamp(30px, 4.8vw, 46px);
    line-height: 1;
}

.timer-head p {
    margin: 8px 0 0;
    color: var(--text-soft);
}

.display-wrap {
    position: relative;
    z-index: 1;
    margin-top: 12px;
    border-radius: 18px;
    padding: clamp(12px, 2.2vw, 18px);
    border: 1px solid var(--shell-border);
    background: rgba(255, 255, 255, 0.2);
}

.display {
    margin: 0;
    font-family: var(--mono);
    font-size: clamp(62px, 13vw, 148px);
    line-height: 1;
    letter-spacing: 0.02em;
    font-variant-numeric: tabular-nums;
}

.colon {
    opacity: 0.78;
}

.status {
    margin: 10px 0 0;
    color: var(--text-soft);
    font-size: 14px;
}

.danger-track {
    margin-top: 10px;
    width: 100%;
    height: 8px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.3);
    overflow: hidden;
}

#danger-fill {
    display: block;
    width: calc(var(--danger-ratio) * 100%);
    height: 100%;
    border-radius: 999px;
    background: linear-gradient(90deg, #ffad4d, var(--danger));
    transition: width 0.22s linear;
}

.control-panel {
    position: relative;
    z-index: 1;
    margin-top: 14px;
    display: grid;
    gap: 12px;
}

.fields {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.field {
    display: grid;
    gap: 6px;
}

.field span {
    font-size: 13px;
    color: var(--text-soft);
}

.field input {
    width: 100%;
    border-radius: 10px;
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--text);
    font-family: var(--mono);
    font-size: 20px;
    padding: 10px 12px;
    outline: none;
}

.field input:focus {
    border-color: rgba(84, 143, 255, 0.7);
    box-shadow: 0 0 0 3px rgba(84, 143, 255, 0.16);
}

.actions {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 8px;
}

.btn {
    border-radius: 11px;
    border: 1px solid var(--btn-border);
    background: var(--btn-bg);
    color: var(--text);
    padding: 10px 8px;
    font-weight: 700;
    cursor: pointer;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    border-color: rgba(255, 255, 255, 0.46);
    background: var(--primary);
    color: #fff;
}

.btn-ghost {
    opacity: 0.88;
}

.notify-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-soft);
    font-size: 14px;
}

.tips {
    margin: 0;
    color: var(--text-soft);
    font-size: 12px;
}

.timer-shell.is-danger {
    box-shadow:
        var(--shell-shadow),
        0 0 0 1px rgba(255, 126, 146, 0.42),
        0 0 48px rgba(255, 112, 133, 0.22);
}

@media (max-width: 760px) {
    .timer-page {
        width: min(96vw, 720px);
        margin: 10px auto;
    }

    .actions {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .fields {
        grid-template-columns: 1fr;
    }
}