/* ==========================================================================
   ICU 监护仪器数据采集系统 — 专业医疗风格
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --primary: #1a5276;
    --primary-light: #2980b9;
    --primary-lighter: #eaf2f8;
    --accent: #16a085;
    --success: #27ae60;
    --success-bg: #eafaf1;
    --gray-50: #f8f9fa;
    --gray-100: #f0f2f5;
    --gray-200: #e2e6ea;
    --gray-300: #cbd1d8;
    --gray-400: #a0aab4;
    --gray-500: #6c757d;
    --gray-700: #343a40;
    --gray-900: #1a1a2e;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,.06);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

body {
    font-family: var(--font);
    background: linear-gradient(135deg, #e8edf2 0%, #f0f4f8 50%, #eaf0f5 100%);
    color: var(--gray-900);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.header {
    background: #fff;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    max-width: 980px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 17px;
    font-weight: 600;
    color: var(--primary);
}
.header-badge {
    font-size: 13px;
    padding: 5px 14px;
    border-radius: 20px;
    font-weight: 500;
    background: #fdedec;
    color: #c0392b;
}
.header-badge.connected {
    background: var(--success-bg);
    color: var(--success);
}

.main {
    max-width: 980px;
    margin: 0 auto;
    padding: 28px 24px 64px;
}

.card {
    background: #fff;
    border-radius: var(--radius);
    padding: 32px 36px;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    margin-bottom: 20px;
}
.card-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
    color: var(--gray-900);
}
.card-subtitle {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 20px;
}

.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 6px;
}
.step-num {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    background: var(--gray-200);
    color: var(--gray-400);
    transition: all .4s;
}
.step-num.active { background: var(--primary); color: #fff; }
.step-num.done { background: var(--accent); color: #fff; }
.step-line {
    width: 72px;
    height: 2px;
    background: var(--gray-200);
    margin: 0 6px;
    transition: background .4s;
}
.step-line.done { background: var(--accent); }
.step-labels {
    display: flex;
    justify-content: center;
    margin-bottom: 28px;
}
.step-label {
    width: 100px;
    text-align: center;
    font-size: 12px;
    color: var(--gray-400);
    font-weight: 500;
}
.step-label.active { color: var(--primary); font-weight: 600; }

.drop-zone {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius);
    padding: 44px 24px;
    text-align: center;
    cursor: pointer;
    transition: all .25s;
    margin-bottom: 18px;
    background: var(--gray-50);
}
.drop-zone:hover, .drop-zone.drag-over {
    border-color: var(--primary-light);
    background: var(--primary-lighter);
}
.drop-icon { color: var(--gray-300); margin-bottom: 10px; transition: color .25s; }
.drop-zone:hover .drop-icon { color: var(--primary-light); }
.drop-text { font-size: 15px; color: var(--gray-700); margin-bottom: 6px; }
.drop-text .link { color: var(--primary-light); text-decoration: none; font-weight: 600; cursor: pointer; }
.drop-hint { font-size: 12px; color: var(--gray-400); }

.file-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    background: var(--primary-lighter);
    border: 1px solid #d5e8f5;
    border-radius: var(--radius);
    margin-bottom: 18px;
}
.file-icon { color: var(--primary); }
.file-details { flex: 1; display: flex; flex-direction: column; }
.file-name { font-weight: 600; font-size: 14px; color: var(--gray-900); }
.file-size { font-size: 12px; color: var(--gray-500); }
.btn-remove {
    background: none; border: none; font-size: 18px; cursor: pointer;
    color: var(--gray-400); padding: 4px 8px; border-radius: 4px;
}
.btn-remove:hover { color: #c0392b; background: #fdedec; }

.settings-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 22px;
}
.setting label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--gray-700);
}
.input-with-unit {
    display: flex;
    align-items: center;
    gap: 8px;
}
.input-with-unit input {
    width: 90px;
    padding: 10px 12px;
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    text-align: center;
    font-family: var(--font);
    transition: border-color .2s, box-shadow .2s;
}
.input-with-unit input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(26,82,118,.1);
}
.unit { font-size: 13px; color: var(--gray-500); }

.instrument-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-checkbox {
    display: flex; align-items: center; gap: 5px;
    padding: 7px 14px;
    border: 1px solid var(--gray-300);
    border-radius: 20px;
    cursor: pointer; font-size: 13px; user-select: none;
    transition: all .2s;
    background: #fff;
}
.tag-checkbox:hover { border-color: var(--primary-light); }
.tag-checkbox:has(input:checked) {
    background: var(--primary-lighter);
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}
.tag-checkbox input { display: none; }

.btn-primary {
    display: block; width: 100%;
    padding: 13px;
    background: var(--primary);
    color: #fff; border: none; border-radius: 6px;
    font-size: 16px; font-weight: 600;
    cursor: pointer; transition: all .2s;
    font-family: var(--font);
}
.btn-primary:hover { background: var(--primary-light); }
.btn-primary:disabled { background: var(--gray-300); cursor: not-allowed; }
.btn-secondary {
    padding: 10px 28px;
    background: #fff; color: var(--primary);
    border: 2px solid var(--primary); border-radius: 6px;
    font-size: 14px; font-weight: 600;
    cursor: pointer; transition: all .2s;
    font-family: var(--font);
}
.btn-secondary:hover { background: var(--primary-lighter); }

.progress-bar-wrap {
    background: var(--gray-100);
    border-radius: 6px; height: 10px; overflow: hidden; margin-bottom: 10px;
}
.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--primary-light), var(--accent));
    border-radius: 6px; width: 0%; transition: width .4s ease;
}
.progress-text {
    font-size: 15px; font-weight: 600; color: var(--gray-700); text-align: center;
}
.progress-sub { font-size: 12px; color: var(--gray-500); text-align: center; margin-top: 2px; }

.frame-stream { display: flex; gap: 8px; overflow-x: auto; padding: 12px 0; margin-top: 14px; }
.frame-stream img {
    width: 112px; height: 75px; object-fit: cover;
    border-radius: 6px; border: 2px solid var(--gray-200);
    animation: fadeIn .4s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px; margin-bottom: 24px;
}
.stat-card {
    text-align: center; padding: 18px 12px;
    background: linear-gradient(135deg, var(--primary-lighter), #f0f6fb);
    border-radius: 8px;
    border: 1px solid #d5e8f5;
}
.stat-value { font-size: 28px; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 12px; color: var(--gray-500); margin-top: 4px; }

.tabs { margin-bottom: 20px; }
.tab-nav {
    display: flex;
    border-bottom: 2px solid var(--gray-200);
    margin-bottom: 0;
}
.tab-btn {
    padding: 10px 22px; border: none; background: none;
    font-size: 14px; font-weight: 500; color: var(--gray-500);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px; transition: all .2s;
    font-family: var(--font);
}
.tab-btn:hover { color: var(--gray-700); }
.tab-btn.active {
    color: var(--primary); font-weight: 700;
    border-bottom-color: var(--primary);
}

.data-table-wrap {
    overflow-x: auto;
    border-radius: 6px;
    border: 1px solid var(--gray-200);
}
.data-table {
    width: 100%; border-collapse: collapse; font-size: 13px;
}
.data-table thead th {
    background: var(--primary);
    color: #fff; padding: 10px 14px;
    font-weight: 600; white-space: nowrap;
    font-size: 12px;
}
.data-table tbody td {
    padding: 8px 14px; text-align: center;
    border-bottom: 1px solid var(--gray-100);
    font-variant-numeric: tabular-nums;
}
.data-table tbody tr:nth-child(even) { background: var(--gray-50); }
.data-table tbody tr:hover { background: var(--primary-lighter); }
.data-table td.null-value { color: var(--gray-300); font-size: 12px; }

.gallery-toggle {
    text-align: center; padding: 10px; color: var(--gray-500);
    font-size: 13px; cursor: pointer; user-select: none;
}
.gallery-toggle:hover { color: var(--primary); }
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px; margin-top: 8px;
}
.gallery-item {
    aspect-ratio: 16/10; border-radius: 6px; overflow: hidden;
    border: 2px solid var(--gray-200); cursor: pointer; transition: all .2s;
    position: relative;
}
.gallery-item:hover { border-color: var(--primary); transform: scale(1.02); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; }
.gallery-item .gallery-timestamp {
    position: absolute; bottom: 0; left: 0; right: 0;
    background: rgba(0,0,0,.6); color: #fff;
    font-size: 11px; padding: 3px 8px; text-align: center;
}

.result-header {
    display: flex; align-items: flex-start; justify-content: space-between;
    flex-wrap: wrap; gap: 12px; margin-bottom: 20px;
}
.result-header .btn-primary { width: auto; padding: 10px 28px; font-size: 14px; }

.lightbox-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,.88);
    z-index: 999; display: flex; align-items: center; justify-content: center;
    cursor: pointer;
}
.lightbox-overlay img { max-width: 92vw; max-height: 92vh; border-radius: 6px; }

/* --- References --- */
.references-section {
    border-top: 3px solid var(--primary-lighter);
    opacity: 0.8;
}
.ref-list {
    padding-left: 22px;
    color: var(--gray-500);
    font-size: 12px;
    line-height: 2;
}
.ref-list li { margin-bottom: 2px; }
.ref-list a { color: var(--primary-light); text-decoration: none; }
.ref-list a:hover { text-decoration: underline; }

/* --- 技术原理板块 --- */
.tech-section { border-top: 3px solid var(--primary); }
.tech-h3 {
    font-size: 17px; font-weight: 700; color: var(--primary);
    margin: 28px 0 14px; padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-lighter);
}
.tech-h4 {
    font-size: 15px; font-weight: 700; color: var(--gray-700);
    margin: 20px 0 10px;
}
.tech-desc {
    font-size: 14px; color: var(--gray-700); line-height: 1.8;
    margin-top: 14px; text-indent: 2em;
}

/* --- 流程图 --- */
.flowchart-box { text-align: center; padding: 20px 0; }
.flow-node {
    display: inline-block; padding: 10px 28px;
    background: var(--primary-lighter); color: var(--primary);
    border: 2px solid var(--primary); border-radius: 8px;
    font-size: 14px; font-weight: 600;
}
.flow-diamond {
    display: inline-block; padding: 10px 24px;
    background: #fff8e1; color: #795548;
    border: 2px solid #ffc107; border-radius: 8px;
    font-size: 14px; font-weight: 600;
    transform: rotate(0deg);
}
.flow-arrow { font-size: 22px; color: var(--gray-400); padding: 4px 0; }
.flow-branch {
    display: flex; justify-content: center; gap: 40px;
    padding: 6px 0 10px; font-size: 13px;
}
.flow-branch-item { display: flex; align-items: center; gap: 6px; }
.flow-tag {
    display: inline-block; padding: 2px 10px; border-radius: 12px;
    font-weight: 700; font-size: 12px;
}
.flow-tag.yes { background: #eafaf1; color: var(--success); border: 1px solid var(--success); }
.flow-tag.no { background: #fdedec; color: #c0392b; border: 1px solid #c0392b; }
.flow-back { color: var(--gray-500); }

/* --- 信息表格 --- */
.info-table {
    width: 100%; border-collapse: collapse; font-size: 14px;
    margin-bottom: 16px;
}
.info-table td {
    padding: 9px 14px; border: 1px solid var(--gray-200);
}
.info-table td:first-child {
    background: var(--primary-lighter); font-weight: 700;
    color: var(--primary); width: 120px; white-space: nowrap;
}
.info-table td:last-child { color: var(--gray-700); }

/* --- 设计列表 --- */
.design-list {
    padding-left: 20px; color: var(--gray-700); font-size: 14px; line-height: 1.9;
}
.design-list li { margin-bottom: 6px; }
.design-list li strong { color: var(--primary); }

/* --- 参数表格 --- */
.param-table {
    width: 100%; border-collapse: collapse; font-size: 13px;
    border: 1px solid var(--gray-200); border-radius: 6px; overflow: hidden;
}
.param-table thead th {
    background: var(--primary); color: #fff; padding: 10px 14px;
    font-weight: 600; text-align: left;
}
.param-table thead th:first-child { width: 120px; }
.param-table tbody td {
    padding: 9px 14px; border-bottom: 1px solid var(--gray-100);
    color: var(--gray-700);
}
.param-table tbody td:first-child { font-weight: 600; color: var(--primary); background: var(--gray-50); }
.param-table tbody tr:nth-child(even) { background: var(--gray-50); }
.param-table tbody tr:hover { background: var(--primary-lighter); }

/* --- 代码块 --- */
.code-block {
    background: #1a1a2e; color: #a8d8a8; border-radius: 8px;
    padding: 16px 20px; overflow-x: auto; font-size: 12px;
    line-height: 1.7; margin-top: 8px;
    font-family: "Cascadia Code", "Fira Code", "Consolas", "Courier New", monospace;
}
.code-block pre { margin: 0; white-space: pre; }

/* --- 参考文献 --- */
.references-section {
    border-top: 3px solid var(--primary-lighter);
    opacity: 0.8;
}
.ref-list {
    padding-left: 22px;
    color: var(--gray-500);
    font-size: 12px;
    line-height: 2;
}
.ref-list li { margin-bottom: 2px; }
.ref-list a { color: var(--primary-light); text-decoration: none; }
.ref-list a:hover { text-decoration: underline; }

.hidden { display: none !important; }

@media (max-width: 640px) {
    .settings-row { grid-template-columns: 1fr; }
    .header-inner { padding: 10px 16px; }
    .main { padding: 16px 12px; }
    .card { padding: 20px 16px; }
    .result-header { flex-direction: column; align-items: stretch; }
    .result-header .btn-primary { text-align: center; }
    .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
    .flow-branch { flex-direction: column; gap: 8px; align-items: center; }
    .info-table td:first-child { width: 90px; }
}
    .settings-row { grid-template-columns: 1fr; }
    .header-inner { padding: 10px 16px; }
    .main { padding: 16px 12px; }
    .card { padding: 20px 16px; }
    .result-header { flex-direction: column; align-items: stretch; }
    .result-header .btn-primary { text-align: center; }
    .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
}