/* ============================================
   Themes — Dark/Light with system preference
   ============================================ */

/* Dark theme (default) */
:root,
[data-theme="dark"] {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-card-hover: rgba(31, 41, 55, 0.9);
    --bg-card-solid: #151d2e;
    --bg-sidebar: rgba(10, 14, 23, 0.95);
    --bg-code: #0d1117;
    --bg-input: rgba(31, 41, 55, 0.6);
    --bg-backdrop: rgba(0, 0, 0, 0.6);

    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --text-code: #e5e7eb;
    --text-inverse: #0a0e17;

    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --accent-glow: rgba(59, 130, 246, 0.3);

    --green: #10b981;
    --yellow: #f59e0b;
    --red: #ef4444;
    --orange: #f97316;
    --cyan: #06b6d4;
    --pink: #ec4899;

    --border-color: rgba(75, 85, 99, 0.4);
    --border-glow: rgba(59, 130, 246, 0.2);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.15);

    /* Syntax highlighting */
    --syn-keyword: #ff7b72;
    --syn-string: #a5d6ff;
    --syn-comment: #8b949e;
    --syn-function: #d2a8ff;
    --syn-type: #79c0ff;
    --syn-number: #79c0ff;
    --syn-annotation: #ffa657;
}

/* Light theme */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-card-hover: rgba(248, 250, 252, 1);
    --bg-card-solid: #ffffff;
    --bg-sidebar: rgba(255, 255, 255, 0.98);
    --bg-code: #1e293b;
    --bg-input: rgba(241, 245, 249, 0.8);
    --bg-backdrop: rgba(0, 0, 0, 0.3);

    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-code: #e2e8f0;
    --text-inverse: #f8fafc;

    --border-color: rgba(203, 213, 225, 0.6);
    --border-glow: rgba(59, 130, 246, 0.15);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.08);
}

/* System preference fallback (when no data-theme set) */
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) {
        --bg-primary: #f8fafc;
        --bg-secondary: #ffffff;
        --bg-card: rgba(255, 255, 255, 0.9);
        --bg-card-hover: rgba(248, 250, 252, 1);
        --bg-card-solid: #ffffff;
        --bg-sidebar: rgba(255, 255, 255, 0.98);
        --bg-code: #1e293b;
        --bg-input: rgba(241, 245, 249, 0.8);
        --bg-backdrop: rgba(0, 0, 0, 0.3);

        --text-primary: #1e293b;
        --text-secondary: #64748b;
        --text-muted: #94a3b8;
        --text-code: #e2e8f0;
        --text-inverse: #f8fafc;

        --border-color: rgba(203, 213, 225, 0.6);
        --border-glow: rgba(59, 130, 246, 0.15);

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
        --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
        --shadow-glow: 0 0 30px rgba(59, 130, 246, 0.08);
    }
}

/* Theme toggle button */
.theme-toggle {
    position: fixed;
    top: var(--space-md);
    right: var(--space-md);
    z-index: var(--z-toast);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--duration-normal) var(--ease-out);
    box-shadow: var(--shadow-md);

    &:hover {
        border-color: var(--accent-primary);
        box-shadow: var(--shadow-glow);
        transform: scale(1.08);
    }

    &:active {
        transform: scale(0.95);
    }
}

.theme-icon {
    font-size: 18px;
    line-height: 1;
    transition: opacity var(--duration-fast) var(--ease-out);
}

/* Dark: show sun, hide moon */
.theme-icon--moon { display: none; }
[data-theme="light"] .theme-icon--sun { display: none; }
[data-theme="light"] .theme-icon--moon { display: inline; }
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) .theme-icon--sun { display: none; }
    :root:not([data-theme]) .theme-icon--moon { display: inline; }
}