/**
 * CairnJS Examples Shared Design System
 * Unified tokens, responsive header, theme toggler, and interactive playground connectivity.
 */

:root,
[data-theme="dark"] {
    --bg: #15120f;
    --surface: #1f1a15;
    --surface-card: #27211b;
    --surface-hover: #332b23;
    --border: rgba(189, 165, 150, 0.22);
    --border-active: #B19578;
    --text: #EEE3DA;
    --text-muted: #BDA596;
    --accent: #B19578;
    --accent-hover: #c5a880;
    --cairn-primary: #50483D;
    --cairn-secondary: #B19578;
    --cairn-accent: #BDA596;
    --cairn-earth: #967B5E;
    --cairn-background: #EEE3DA;
    --cairn-outline: #32291F;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --header-bg: rgba(21, 18, 15, 0.85);
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --shadow-card: 0 20px 40px rgba(0, 0, 0, 0.4);
    --shadow-btn: 0 4px 14px rgba(177, 149, 120, 0.35);
}

[data-theme="light"] {
    --bg: #EEE3DA;
    --surface: #f5ede6;
    --surface-card: #ffffff;
    --surface-hover: #ebe0d6;
    --border: #d8c8ba;
    --border-active: #50483D;
    --text: #32291F;
    --text-muted: #50483D;
    --accent: #50483D;
    --accent-hover: #32291F;
    --cairn-primary: #50483D;
    --cairn-secondary: #B19578;
    --cairn-accent: #BDA596;
    --cairn-earth: #967B5E;
    --cairn-background: #EEE3DA;
    --cairn-outline: #32291F;
    --success: #059669;
    --warning: #d97706;
    --danger: #dc2626;
    --header-bg: rgba(238, 227, 218, 0.9);
    --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-btn: 0 4px 12px rgba(80, 72, 61, 0.25);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background 0.2s ease, color 0.2s ease;
    overflow-x: hidden;
}

/* ==========================================================================
   Header Navigation Bar
   ========================================================================== */
.example-header {
    height: 58px;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    text-decoration: none;
    color: var(--text);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.brand-logo {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.breadcrumb-nav {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.breadcrumb-link {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.15s ease;
}

.breadcrumb-link:hover {
    color: var(--accent);
}

.breadcrumb-current {
    color: var(--text);
    font-weight: 600;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 0.65rem;
}

.btn-playground {
    background: linear-gradient(135deg, #B19578, #967B5E);
    color: #15120f !important;
    border: none;
    padding: 0.45rem 0.95rem;
    border-radius: 0.5rem;
    font-size: 0.825rem;
    font-weight: 700;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    box-shadow: var(--shadow-btn);
    transition: all 0.15s ease;
    cursor: pointer;
}

[data-theme="light"] .btn-playground {
    background: #50483D;
    color: #EEE3DA !important;
}

.btn-playground:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.icon-btn {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 36px;
    height: 36px;
    border-radius: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
    font-size: 0.9rem;
}

.icon-btn:hover {
    background: var(--surface-hover);
    color: var(--text);
    border-color: var(--accent);
}

/* ==========================================================================
   Page Layout & Card Containers
   ========================================================================== */
.example-main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2.5rem 1.25rem;
}

.demo-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: 1.25rem;
    padding: 2rem;
    box-shadow: var(--shadow-card);
    width: 100%;
    max-width: 480px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.demo-card-wide {
    max-width: 860px;
}

.demo-card-full {
    max-width: 1100px;
}

.demo-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.25rem 0.65rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: rgba(177, 149, 120, );
    color: var(--accent);
    border: 1px solid rgba(177, 149, 120, );
    margin-bottom: 0.85rem;
}

.demo-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.45rem;
    letter-spacing: -0.02em;
}

.demo-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1.5rem;
}

/* ==========================================================================
   Buttons & Inputs
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--surface-hover);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 0.65rem 1.25rem;
    font-weight: 600;
    font-size: 0.925rem;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
    font-family: var(--font-sans);
}

.btn:hover {
    background: var(--surface-hover);
    border-color: var(--accent);
}

.btn-primary {
    background: var(--accent);
    color: #15120f;
    border: 1px solid var(--border-active);
    box-shadow: var(--shadow-btn);
}

[data-theme="light"] .btn-primary {
    background: #50483D;
    color: #EEE3DA;
    border-color: #32291F;
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: var(--danger);
    color: #ffffff;
}

.input-field {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.7rem 0.95rem;
    border-radius: 0.5rem;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.input-field:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(177, 149, 120, );
}

/* ==========================================================================
   Live Signal Inspector Bar
   ========================================================================== */
.signal-bar {
    margin-top: 1.5rem;
    padding: 0.85rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.65rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.signal-val {
    color: var(--accent);
    font-weight: 700;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 768px) {
    .example-header {
        padding: 0 1rem;
        height: 54px;
    }

    .breadcrumb-nav {
        display: none;
    }

    .btn-playground span {
        display: none;
    }

    .btn-playground {
        padding: 0.45rem 0.65rem;
    }

    .demo-card {
        padding: 1.5rem 1.25rem;
        border-radius: 1rem;
    }
}