/* ============================================
    CSS Variables & Theme
    ============================================ */
:root {
    --bg-primary: #0a0e14;
    --bg-secondary: #12171f;
    --bg-card: #181f2a;
    --bg-input: #1e2734;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #5a6370;
    --border-color: #2d3748;
    --accent-primary: #06b6d4;
    --accent-primary-dim: rgba(6, 182, 212, 0.15);
    --accent-success: #22c55e;
    --accent-success-dim: rgba(34, 197, 94, 0.15);
    --accent-warning: #eab308;
    --accent-warning-dim: rgba(234, 179, 8, 0.15);
    --accent-error: #ef4444;
    --accent-error-dim: rgba(239, 68, 68, 0.15);
    --accent-info: #8b5cf6;
    --accent-info-dim: rgba(139, 92, 246, 0.15);
    --accent-secondary: #6366f1;
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);

    /* Chart-specific colors */
    --chart-saturation: #f59e0b;
    --chart-rh-line: rgba(6, 182, 212, 0.5);
    --chart-enthalpy: rgba(34, 197, 94, 0.6);
    --chart-volume: rgba(139, 92, 246, 0.5);
    --chart-point: #ef4444;
    --chart-grid: rgba(91, 99, 115, 0.3);
}

[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-input: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #cbd5e1;
    --accent-primary-dim: rgba(6, 182, 212, 0.1);
    --accent-success-dim: rgba(34, 197, 94, 0.1);
    --accent-warning-dim: rgba(234, 179, 8, 0.1);
    --accent-error-dim: rgba(239, 68, 68, 0.1);
    --accent-info-dim: rgba(139, 92, 246, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
}

*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 24px;
}

/* ============================================
    Header
    ============================================ */
header {
    padding: 24px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.15s ease;
}

.back-link svg {
    width: 18px;
    height: 18px;
}

.back-link:hover {
    color: var(--text-primary);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.tool-icon-header {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: var(--accent-primary-dim);
    border: 1px solid rgba(6, 182, 212, 0.35);
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tool-icon-header svg {
    width: 24px;
    height: 24px;
    stroke: currentColor;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.tagline {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 4px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.status-badges {
    display: flex;
    gap: 8px;
}

.status-badge {
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.status-badge.ok {
    background: var(--accent-success-dim);
    border-color: var(--accent-success);
    color: var(--accent-success);
}

.status-badge.warn {
    background: var(--accent-warning-dim);
    border-color: var(--accent-warning);
    color: var(--accent-warning);
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    gap: 6px;
    padding: 4px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    border-radius: 10px;
}

.theme-toggle button {
    width: 36px;
    height: 36px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
}

.theme-toggle button svg {
    width: 18px;
    height: 18px;
}

.theme-toggle button:hover {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

html[data-theme="light"] .theme-toggle button[data-theme-toggle="light"],
html:not([data-theme="light"]) .theme-toggle button[data-theme-toggle="dark"] {
    background: var(--bg-input);
    color: var(--text-primary);
    border-color: var(--accent-primary);
}

/* ============================================
    Main Layout
    ============================================ */
.main-layout {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 24px;
}

@media (max-width: 1200px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.panel-title {
    font-size: 0.9375rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel-title svg {
    width: 18px;
    height: 18px;
    stroke: var(--accent-primary);
}

.panel-body {
    padding: 20px;
}

/* ============================================
    Chart Area
    ============================================ */
.chart-area {
    padding: 20px;
    display: flex;
    flex-direction: column;
}

.chart-toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.chart-legend {
    display: flex;
    gap: 16px;
    font-size: 0.75rem;
    font-family: 'JetBrains Mono', monospace;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
}

.legend-swatch {
    width: 24px;
    height: 6px;
    flex-shrink: 0;
}

.legend-item svg[viewBox="0 0 12 12"] {
    width: 12px;
    height: 12px;
}

.toolbar {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
}

.view-preset-toggle {
    display: inline-flex;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 2px;
    gap: 2px;
}

.view-preset-toggle button {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.72rem;
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.view-preset-toggle button:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.view-preset-toggle button.active {
    color: var(--text-primary);
    background: var(--bg-card);
    border-color: var(--accent-primary);
}

.tool-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 14px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.tool-btn:hover:not(:disabled) {
    border-color: var(--accent-primary);
    background: var(--bg-card);
}

.tool-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.tool-btn svg {
    width: 14px;
    height: 14px;
}

.chart-container {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    min-height: 460px;
    max-height: 78vh;
    position: relative;
}

@media (max-width: 900px) {
    .chart-container {
        aspect-ratio: 4 / 3;
        min-height: 380px;
    }
}

#psychoCanvas {
    cursor: crosshair;
    width: 100%;
    height: 100%;
}