:root {
    --bg-main: #eef8ff;
    --bg-soft: #f7fcff;
    --bg-card: rgba(255, 255, 255, 0.8);
    --bg-accent: #d9efff;
    --line: #c7e4f6;
    --line-strong: #94cde9;
    --text-main: #21445c;
    --text-soft: #5b7c91;
    --primary: #68b6de;
    --primary-deep: #4497c7;
    --success: #71c7aa;
    --shadow: 0 16px 40px rgba(113, 174, 206, 0.18);
    --danger-soft: #f8c4ca;
    --danger: #e48b96;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    overflow-x: auto;
    overflow-y: auto;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-main);
    background:
        radial-gradient(circle at top left, rgba(187, 228, 255, 0.9), transparent 28%),
        radial-gradient(circle at bottom right, rgba(168, 224, 239, 0.55), transparent 24%),
        linear-gradient(180deg, #f6fcff 0%, #eaf6ff 100%);
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 280px 1fr 420px;
    gap: 18px;
    padding: 18px;
    align-items: start;
}

.control-panel,
.visualization-panel,
.feed-panel,
.finished-panel,
.status-strip,
.info-panel {
    backdrop-filter: blur(16px);
}

.control-panel,
.info-panel,
.visualization-panel,
.status-strip {
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 24px;
    box-shadow: var(--shadow);
}

.control-panel,
.info-panel {
    padding: 22px 18px;
}

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.eyebrow {
    margin: 0 0 8px;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 12px;
    color: var(--primary-deep);
}

.panel-header h1,
.section-title h2 {
    margin: 0;
}

.subtitle,
.section-title p {
    margin: 8px 0 0;
    color: var(--text-soft);
    line-height: 1.5;
    font-size: 14px;
}

.control-group {
    padding: 16px;
    border-radius: 18px;
    background: var(--bg-soft);
    border: 1px solid var(--line);
}

.control-group h2 {
    margin: 0 0 14px;
    font-size: 16px;
}

.slider-field {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 12px 0 8px;
    font-size: 14px;
}

.range-input {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 8px;
    border-radius: 999px;
    outline: none;
    background: linear-gradient(90deg, var(--danger-soft) 0%, var(--danger-soft) 50%, #cce8f8 50%, #cce8f8 100%);
}

.range-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--primary-deep);
    box-shadow: 0 4px 10px rgba(68, 151, 199, 0.22);
    cursor: pointer;
}

.range-input::-moz-range-track {
    height: 8px;
    border-radius: 999px;
    background: transparent;
}

.range-input::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    border: 2px solid var(--primary-deep);
    box-shadow: 0 4px 10px rgba(68, 151, 199, 0.22);
    cursor: pointer;
}

.slider-field strong.invalid-value {
    color: #c75a6a;
}

.preset-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.preset-grid button {
    text-align: left;
    background: #f2f9fe;
}

.source-link {
    display: block;
    text-decoration: none;
    text-align: left;
    padding: 12px 14px;
    border-radius: 14px;
    background: #f2f9fe;
    color: var(--text-main);
    font-size: 14px;
    font-weight: 600;
    border: 1px solid #d7ebf8;
    transition: transform 0.16s ease, background 0.16s ease;
}

.source-link:hover {
    transform: translateY(-1px);
    background: #e7f4fd;
}

.action-row {
    margin-top: auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

button {
    border: none;
    border-radius: 14px;
    padding: 12px 14px;
    cursor: pointer;
    background: #e4f4ff;
    color: var(--text-main);
    font-size: 14px;
    font-weight: 600;
    transition: transform 0.16s ease, background 0.16s ease;
}

button:hover {
    transform: translateY(-1px);
    background: #d7efff;
}

button.primary {
    background: linear-gradient(135deg, #7dc7eb, #59a9d7);
    color: white;
}

button.danger {
    background: linear-gradient(135deg, #ffd6d8, #f4a8b1);
    color: #7d3140;
}

.modal-close {
    background: #eaf6ff;
}

.main-stage {
    display: grid;
    grid-template-rows: auto auto;
    gap: 18px;
}

.status-strip {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    padding: 16px;
}

.stat-card {
    padding: 16px;
    background: var(--bg-soft);
    border: 1px solid var(--line);
    border-radius: 18px;
}

.stat-label {
    display: block;
    font-size: 13px;
    color: var(--text-soft);
    margin-bottom: 8px;
}

.stat-card strong {
    font-size: 28px;
}

.visualization-panel {
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.windows-grid {
    display: flex;
    flex-wrap: nowrap;
    align-items: flex-start;
    gap: 16px;
    margin-top: 18px;
    overflow-x: auto;
    overflow-y: visible;
    padding: 8px 4px 12px 0;
}

.window-card {
    min-width: 240px;
    padding: 8px 10px 14px;
    border: none;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    position: relative;
}

.window-card::after {
    content: "";
    position: absolute;
    top: 40px;
    bottom: 0;
    right: 0;
    width: 1px;
    background: linear-gradient(180deg, transparent, #b7dced, transparent);
}

.window-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.badge {
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    background: #e7f5ff;
    color: var(--primary-deep);
}

.badge.busy {
    background: #d7f3e8;
    color: #2b8f70;
}

.service-slot {
    min-height: 90px;
    padding: 12px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.55);
    border: 1px dashed #a7d4ea;
    margin-bottom: 14px;
}

.queue-label {
    margin-bottom: 10px;
    color: var(--text-soft);
    font-size: 13px;
}

.queue-stack {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.customer-chip {
    min-width: 78px;
    padding: 10px 12px;
    border-radius: 16px;
    background: white;
    border: 1px solid #bde0f2;
    box-shadow: 0 8px 20px rgba(144, 203, 232, 0.18);
}

.customer-chip.active {
    background: linear-gradient(135deg, #8dd3f3, #dff5ff);
    border-color: #7dc1e4;
}

.customer-id {
    display: block;
    font-size: 14px;
    font-weight: 700;
}

.customer-time {
    display: block;
    margin-top: 6px;
    font-size: 12px;
    color: var(--text-soft);
    line-height: 1.4;
}

.info-panel,
.finished-panel {
    display: flex;
    flex-direction: column;
}

.info-panel {
    padding: 18px;
    position: sticky;
    top: 18px;
    height: calc(100vh - 36px);
}

.finished-panel {
    padding: 18px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.7);
    border-radius: 22px;
    box-shadow: var(--shadow);
    height: 100%;
}

.event-section {
    margin-top: 18px;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    min-height: 240px;
}

.scroll-panel {
    margin-top: 14px;
    overflow: auto;
    padding-right: 4px;
}

.event-item,
.table-row {
    display: grid;
    gap: 10px;
    padding: 12px 10px;
    border-radius: 14px;
    background: #f8fcff;
    border: 1px solid #dceef9;
}

.event-item + .event-item,
.table-row + .table-row {
    margin-top: 10px;
}

.event-time {
    font-size: 12px;
    color: var(--primary-deep);
    font-weight: 700;
}

.event-text {
    font-size: 14px;
    line-height: 1.5;
}

.table-head,
.table-row {
    grid-template-columns: 1fr 1fr 1fr 1fr;
    align-items: center;
}

.table-head {
    display: grid;
    padding: 12px 10px 4px;
    color: var(--text-soft);
    font-size: 12px;
    font-weight: 700;
}

.table-body {
    flex: 1;
}

.empty-state {
    padding: 18px;
    text-align: center;
    color: var(--text-soft);
    border: 1px dashed var(--line);
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.65);
}

.event-log-box {
    max-height: 260px;
}

.finished-panel .scroll-panel {
    flex: 1;
}

.hidden {
    display: none;
}

.modal-backdrop.hidden {
    display: none;
}

.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(126, 172, 201, 0.32);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    z-index: 30;
}

.stats-modal {
    width: min(860px, 100%);
    max-height: 88vh;
    overflow: auto;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(239, 249, 255, 0.96));
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 28px;
    box-shadow: 0 24px 60px rgba(94, 160, 192, 0.26);
    padding: 24px;
}

.modal-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.modal-head p,
.chart-card h3 {
    margin: 8px 0 0;
    color: var(--text-soft);
}

.modal-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin-top: 18px;
}

.summary-pill {
    padding: 14px 16px;
    border-radius: 18px;
    background: #f7fcff;
    border: 1px solid var(--line);
}

.summary-pill span {
    display: block;
    color: var(--text-soft);
    font-size: 12px;
    margin-bottom: 8px;
}

.summary-pill strong {
    font-size: 24px;
}

.chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-top: 20px;
}

.chart-card {
    padding: 18px;
    border-radius: 22px;
    background: rgba(247, 252, 255, 0.92);
    border: 1px solid var(--line);
}

.chart-card h3 {
    margin: 0 0 16px;
    color: var(--text-main);
}

.chart-card canvas {
    width: 100%;
    height: auto;
    display: block;
}

@media (max-width: 1280px) {
    .app-shell {
        grid-template-columns: 240px 1fr;
    }

    .info-panel {
        grid-column: 1 / -1;
        position: static;
        height: auto;
    }
}

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .status-strip {
        grid-template-columns: repeat(2, 1fr);
    }

    .info-panel {
        min-height: 420px;
    }

    .windows-grid {
        flex-direction: column;
    }

    .window-card::after {
        display: none;
    }

    .modal-summary,
    .chart-grid {
        grid-template-columns: 1fr;
    }
}