/* ===== RESET & BASE ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg: #ffffff;
    --bg-secondary: #f7f8fa;
    --text: #1a1a2e;
    --text-secondary: #5a5a7a;
    --border: #e2e4e9;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --physical: #2563eb;
    --camera: #059669;
    --network: #7c3aed;
    --success: #16a34a;
    --warning: #f59e0b;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.10);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ===== HERO ===== */
.hero {
    background: linear-gradient(135deg, #1e293b 0%, #334155 50%, #1e293b 100%);
    color: #fff;
    padding: 64px 0 56px;
    text-align: center;
}

.hero h1 {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 12px;
}

.hero .subtitle {
    font-size: 1.1rem;
    color: #94a3b8;
    font-weight: 400;
}

/* ===== SECTIONS ===== */
.section {
    padding: 52px 0;
    border-bottom: 1px solid var(--border);
}

.section:last-of-type {
    border-bottom: none;
}

.section h2 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
}

.section p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.section-note {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 20px !important;
}

/* ===== DECISION FRAMEWORK ===== */
.question-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 12px;
    transition: border-color 0.2s;
}

.question-card.has-answer {
    border-color: var(--accent);
}

.question-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.15s;
    background: #fff;
}

.radio-group label:hover {
    border-color: var(--accent);
    background: #eff6ff;
}

.radio-group input[type="radio"] {
    accent-color: var(--accent);
}

.recommendation {
    background: linear-gradient(135deg, #eff6ff, #dbeafe);
    border: 1px solid #bfdbfe;
    border-radius: var(--radius);
    padding: 24px;
    margin-top: 20px;
}

.recommendation.hidden {
    display: none;
}

.recommendation h3 {
    font-size: 1.1rem;
    color: var(--accent);
    margin-bottom: 8px;
}

.recommendation p {
    color: var(--text);
    font-size: 1rem;
}

.approach-badges {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

.approach-badge {
    display: inline-block;
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: #fff;
}

.badge-physical {
    background: var(--physical);
}

.badge-camera {
    background: var(--camera);
}

.badge-network {
    background: var(--network);
}

/* ===== COMPARISON TABLE ===== */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

thead th {
    background: #1e293b;
    color: #fff;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    white-space: nowrap;
}

thead th small {
    font-weight: 400;
    opacity: 0.7;
}

tbody td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

tbody tr:last-child td {
    border-bottom: none;
}

tbody tr:nth-child(even) {
    background: var(--bg-secondary);
}

.approach-physical {
    border-left: 3px solid var(--physical);
}

.approach-camera {
    border-left: 3px solid var(--camera);
}

.approach-network {
    border-left: 3px solid var(--network);
}

/* ===== LIVE DEMOS ===== */
.demo-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    background: #fff;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all 0.15s;
    border-right: 1px solid var(--border);
}

.tab-btn:last-child {
    border-right: none;
}

.tab-btn:hover {
    background: var(--bg-secondary);
}

.tab-btn.active {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
}

.demo-panel {
    display: none;
}

.demo-panel.active {
    display: block;
}

.demo-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
}

@media (max-width: 768px) {
    .demo-layout {
        grid-template-columns: 1fr;
    }
}

.demo-controls {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.control-group label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.control-group input[type="text"],
.control-group select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-family: "SF Mono", "Consolas", monospace;
}

.control-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 0.85rem;
}

.control-row label {
    display: flex;
    align-items: center;
    gap: 4px;
}

.control-row select {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
}

.control-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.btn-primary,
.btn-accent,
.btn-secondary {
    padding: 10px 18px;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-hover);
}

.btn-accent {
    background: var(--success);
    color: #fff;
}

.btn-accent:hover:not(:disabled) {
    background: #15803d;
}

.btn-secondary {
    background: #e2e4e9;
    color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
    background: #d1d5db;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.status-msg {
    font-size: 0.85rem;
    color: var(--text-secondary);
    padding: 8px;
    background: #fff;
    border-radius: 6px;
    min-height: 36px;
}

.status-msg.success {
    color: var(--success);
}

.status-msg.error {
    color: #dc2626;
}

.demo-viewer {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.demo-viewer h4 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 12px 0 6px;
    align-self: flex-start;
}

.demo-viewer h4:first-child {
    margin-top: 0;
}

#dwt-container {
    width: 100%;
    min-height: 360px;
}

#dwt-container canvas {
    max-width: 100% !important;
}

#cam-video-wrapper {
    position: relative;
    width: 100%;
    max-width: 640px;
    background: #000;
    border-radius: 6px;
    overflow: hidden;
}

#cam-video-wrapper video {
    width: 100%;
    display: block;
}

#cam-video-wrapper canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.camera-preview {
    width: 100%;
    min-height: 360px;
}

.empty-state {
    text-align: center;
    color: #9ca3af;
    padding: 40px 20px;
}

.empty-state p {
    color: inherit;
}

/* ===== SHARED LICENSE BAR ===== */
.shared-license-bar {
    background: linear-gradient(135deg, #eef2ff 0%, #f0fdf4 100%);
    border: 1px solid #c7d2fe;
    border-radius: var(--radius);
    padding: 14px 18px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.shared-license-bar label {
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 0.9rem;
}

.shared-license-bar label small {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.8rem;
}

.license-input-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.license-input-row input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid #c7d2fe;
    border-radius: 6px;
    font-family: "SF Mono", "Consolas", "Monaco", monospace;
    font-size: 0.8rem;
    background: #fff;
    color: var(--text);
}

.license-input-row input:focus {
    outline: 2px solid var(--accent);
    border-color: var(--accent);
}

.license-hint {
    font-size: 0.8rem;
    color: var(--success);
    font-weight: 600;
    white-space: nowrap;
}

.license-hint.user-key {
    color: var(--accent);
}

/* ===== THUMBNAIL STRIP ===== */
.thumbs-strip {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    width: 100%;
    align-self: flex-start;
    margin-bottom: 12px;
    min-height: 0;
}

.thumbs-strip:empty {
    display: none;
}

.thumb-item {
    position: relative;
    width: 80px;
    height: 80px;
    border: 2px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    background: #fff;
    flex-shrink: 0;
    transition: border-color 0.15s, transform 0.15s;
}

.thumb-item:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

.thumb-item.active {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.3);
}

.thumb-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.thumb-item .thumb-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    font-size: 0.65rem;
    text-align: center;
    padding: 1px 0;
}

.thumb-item .thumb-del {
    position: absolute;
    top: 2px;
    right: 2px;
    background: rgba(220, 38, 38, 0.85);
    color: #fff;
    border: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    font-size: 0.7rem;
    line-height: 1;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
}

.thumb-item:hover .thumb-del {
    display: flex;
}

.thumb-item .thumb-del:hover {
    background: #dc2626;
}

/* Simple thumb class used in dynamic JS */
.thumb {
    position: relative;
    width: 80px;
    height: 80px;
    border: 2px solid var(--border);
    border-radius: 6px;
    overflow: hidden;
    cursor: pointer;
    background: #fff;
    flex-shrink: 0;
    transition: border-color 0.15s, transform 0.15s;
    object-fit: cover;
}

.thumb:hover {
    border-color: var(--accent);
    transform: scale(1.05);
}

/* ===== API DETAILS (collapsible) ===== */
.api-details {
    width: 100%;
    margin-top: 10px;
    align-self: flex-start;
}

.api-details summary {
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 6px 0;
    user-select: none;
}

.api-details summary:hover {
    color: var(--accent);
}

.api-details .code-block {
    margin-top: 6px;
    font-size: 0.75rem;
}

.api-details .code-block.small {
    max-height: 220px;
    overflow-y: auto;
}

/* ===== CODE EXAMPLES ===== */
.code-section {
    margin-bottom: 24px;
}

.code-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-badge {
    background: #fef3c7;
    color: #92400e;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.code-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px 20px;
    border-radius: var(--radius);
    font-family: "SF Mono", "Consolas", "Monaco", monospace;
    font-size: 0.85rem;
    line-height: 1.65;
    overflow-x: auto;
    white-space: pre-wrap;
    word-break: break-word;
}

pre.code-block {
    margin: 0;
}

/* ===== SCENARIOS ===== */
.scenario-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.scenario-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: box-shadow 0.2s;
}

.scenario-card:hover {
    box-shadow: var(--shadow-lg);
}

.scenario-icon {
    font-size: 2rem;
    margin-bottom: 8px;
}

.scenario-card h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.scenario-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.scenario-tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    background: #e0e7ff;
    color: var(--accent);
}

/* ===== FOOTER ===== */
.footer {
    background: #1e293b;
    color: #94a3b8;
    padding: 32px 0;
    text-align: center;
    font-size: 0.9rem;
}

.footer a {
    color: #93c5fd;
}

/* ===== CHECKBOX STYLE ===== */
.checkboxes label {
    font-size: 0.9rem;
}

.checkboxes input[type="checkbox"] {
    accent-color: var(--accent);
}