/* Themes and color schemes */
/* Dark theme (default) with optional theme variants */

/* Default Dark Theme */
:root {
    /* Primary background colors */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --bg-overlay: rgba(42, 42, 42, 0.95);

    /* Text colors */
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --text-inverse: #1a1a1a;

    /* Accent colors */
    --accent-blue: #007acc;
    --accent-blue-light: #40a9ff;
    --accent-blue-dark: #005a9e;

    --accent-green: #32cd32;
    --accent-green-light: #52dd52;
    --accent-green-dark: #228b22;

    --accent-orange: #ffa500;
    --accent-orange-light: #ffb732;
    --accent-orange-dark: #e68a00;

    --accent-red: #ff4444;
    --accent-red-light: #ff6666;
    --accent-red-dark: #cc3333;

    --accent-purple: #8b5cf6;
    --accent-yellow: #fbbf24;

    /* Semantic colors */
    --color-success: var(--accent-green);
    --color-warning: var(--accent-orange);
    --color-error: var(--accent-red);
    --color-info: var(--accent-blue);

    /* Border colors */
    --border-default: rgba(255, 255, 255, 0.2);
    --border-light: rgba(255, 255, 255, 0.1);
    --border-strong: rgba(255, 255, 255, 0.3);
    --border-focus: var(--accent-blue);
    --border-error: var(--accent-red);
    --border-success: var(--accent-green);

    /* Clean highlight colors - VS Code style */
    --selection-bg: #264f78;
    --selection-text: #ffffff;
    --highlight-match: #515c6a;
    --highlight-match-active: #264f78;

    /* Surface colors */
    --surface-1: var(--bg-secondary);
    --surface-2: var(--bg-tertiary);
    --surface-3: #4a4a4a;

    /* Grid and guide colors */
    --grid-color: rgba(255, 255, 255, 0.05);
    --grid-major: rgba(255, 255, 255, 0.1);
    --guide-color: rgba(0, 122, 204, 0.3);
}

/* High Contrast Dark Theme */
[data-theme="high-contrast-dark"] {
    --bg-primary: #000000;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #333333;

    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #999999;

    --border-default: rgba(255, 255, 255, 0.5);
    --border-light: rgba(255, 255, 255, 0.3);
    --border-strong: rgba(255, 255, 255, 0.7);

    --highlight-primary: rgba(0, 150, 255, 0.5);
    --highlight-match: rgba(255, 200, 0, 0.5);
    --highlight-result: rgba(0, 255, 0, 0.5);

    --grid-color: rgba(255, 255, 255, 0.1);
}

/* Blue Dark Theme */
[data-theme="blue-dark"] {
    --bg-primary: #0d1421;
    --bg-secondary: #1e2329;
    --bg-tertiary: #2b3139;

    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;

    --border-default: rgba(59, 130, 246, 0.2);
    --highlight-primary: rgba(59, 130, 246, 0.3);
}

/* Green Dark Theme */
[data-theme="green-dark"] {
    --bg-primary: #0f1419;
    --bg-secondary: #1a2e1a;
    --bg-tertiary: #2d3e2d;

    --accent-green: #00d484;
    --accent-blue: #00a8ff;
    --accent-orange: #ff9500;
    --accent-red: #ff5555;

    --border-default: rgba(0, 212, 132, 0.2);
    --highlight-primary: rgba(0, 212, 132, 0.3);
    --highlight-result: rgba(0, 212, 132, 0.4);
}

/* Purple Dark Theme */
[data-theme="purple-dark"] {
    --bg-primary: #1a0d1f;
    --bg-secondary: #2d1b3d;
    --bg-tertiary: #3d2952;

    --accent-purple: #a855f7;
    --accent-blue: #3b82f6;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;

    --border-default: rgba(168, 85, 247, 0.2);
    --highlight-primary: rgba(168, 85, 247, 0.3);
}

/* Minimal Dark Theme */
[data-theme="minimal-dark"] {
    --bg-primary: #181818;
    --bg-secondary: #202020;
    --bg-tertiary: #282828;

    --text-secondary: #a0a0a0;
    --text-muted: #707070;

    --border-default: rgba(255, 255, 255, 0.15);
    --border-light: rgba(255, 255, 255, 0.08);

    --grid-color: rgba(255, 255, 255, 0.03);

    /* Subtle accents */
    --accent-blue: #6ba7e8;
    --accent-green: #7cc87c;
    --accent-orange: #e8a563;
    --accent-red: #e87979;
}

/* OLED True Black Theme */
[data-theme="oled-black"] {
    --bg-primary: #000000;
    --bg-secondary: #000000;
    --bg-tertiary: #111111;
    --bg-overlay: rgba(0, 0, 0, 0.95);

    --text-primary: #ffffff;
    --text-secondary: #bbbbbb;
    --text-muted: #777777;

    --border-default: rgba(255, 255, 255, 0.2);
    --grid-color: rgba(255, 255, 255, 0.02);
}

/* Theme-specific input styles */
[data-theme="high-contrast-dark"] .canvas-text-input {
    border-width: 2px;
}

[data-theme="high-contrast-dark"] .calculation-result {
    border-width: 2px;
    font-weight: 600;
}

[data-theme="minimal-dark"] .canvas-text-input {
    border: none;
    background: rgba(255, 255, 255, 0.05);
}

[data-theme="minimal-dark"] .calculation-result {
    border: none;
    background: rgba(124, 200, 124, 0.15);
}

/* Theme transitions */
.theme-transition * {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease !important;
}

/* System theme preference detection */
@media (prefers-color-scheme: dark) {
    /* Default dark theme is already applied */
}

@media (prefers-color-scheme: light) {
    /* Light theme would go here - not implemented for this dark-focused app */
    /* Keep dark theme even if system prefers light */
}

/* Accessibility: High contrast preference */
@media (prefers-contrast: high) {
    :root {
        --bg-primary: #000000;
        --bg-secondary: #1a1a1a;
        --text-primary: #ffffff;
        --text-secondary: #ffffff;
        --border-default: rgba(255, 255, 255, 0.7);
        --border-strong: rgba(255, 255, 255, 1);
    }
}

/* Accessibility: Reduced transparency preference */
@media (prefers-reduced-transparency: reduce) {
    :root {
        --bg-overlay: var(--bg-secondary);
        --highlight-primary: var(--accent-blue);
        --highlight-match: var(--accent-orange);
        --highlight-result: var(--accent-green);
        --border-default: rgb(255, 255, 255);
    }
}

/* Color scheme utilities */
.color-primary {
    color: var(--text-primary);
}

.color-secondary {
    color: var(--text-secondary);
}

.color-muted {
    color: var(--text-muted);
}

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

.color-warning {
    color: var(--color-warning);
}

.color-error {
    color: var(--color-error);
}

.color-info {
    color: var(--color-info);
}

.bg-primary {
    background-color: var(--bg-primary);
}

.bg-secondary {
    background-color: var(--bg-secondary);
}

.bg-tertiary {
    background-color: var(--bg-tertiary);
}

.bg-success {
    background-color: var(--color-success);
}

.bg-warning {
    background-color: var(--color-warning);
}

.bg-error {
    background-color: var(--color-error);
}

.bg-info {
    background-color: var(--color-info);
}

.border-primary {
    border-color: var(--border-default);
}

.border-light {
    border-color: var(--border-light);
}

.border-strong {
    border-color: var(--border-strong);
}

.border-focus {
    border-color: var(--border-focus);
}

.border-success {
    border-color: var(--border-success);
}

.border-error {
    border-color: var(--border-error);
}

/* Theme selector styles (for future theme switcher) */
.theme-selector {
    position: fixed;
    top: var(--spacing-lg);
    left: var(--spacing-lg);
    z-index: var(--z-modal);
    background: var(--bg-overlay);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: none;
    /* Hidden by default */
}

.theme-option {
    display: block;
    width: 100%;
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background: transparent;
    border: 1px solid var(--border-light);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-option:hover {
    background: var(--surface-1);
    border-color: var(--border-default);
}

.theme-option.active {
    background: var(--accent-blue);
    border-color: var(--accent-blue);
    color: var(--text-inverse);
}

/* Print theme override */
@media print {
    * {
        background: white !important;
        color: black !important;
        border-color: black !important;
    }
}