/* ============================================
   DESIGN TOKENS
   Единый источник всех визуальных констант
   ============================================ */

:root {
    /* ============================================
       COLOR PALETTE
       ============================================ */

    /* Основные */
    --color-primary-50:  #eef2ff;
    --color-primary-100: #e0e7ff;
    --color-primary-200: #c7d2fe;
    --color-primary-300: #a5b4fc;
    --color-primary-400: #818cf8;
    --color-primary-500: #6366f1;
    --color-primary-600: #4f46e5;
    --color-primary-700: #4338ca;
    --color-primary-800: #3730a3;
    --color-primary-900: #312e81;

    /* Акцент */
    --color-accent: var(--color-primary-500);
    --color-accent-light: var(--color-primary-100);
    --color-accent-dark: var(--color-primary-700);

    /* Семантические */
    --color-success-50:  #ecfdf5;
    --color-success-500: #10b981;
    --color-success-600: #059669;

    --color-danger-50:  #fef2f2;
    --color-danger-500: #ef4444;
    --color-danger-600: #dc2626;

    --color-warning-50:  #fffbeb;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;

    --color-info-50:  #eff6ff;
    --color-info-500: #3b82f6;
    --color-info-600: #2563eb;

    /* ============================================
       TYPOGRAPHY
       ============================================ */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family: var(--font-family-base);
    --font-family-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

    /* Размеры — fluid scale для всех экранов */
    --font-size-xs:   clamp(11px, 3vw, 12px);
    --font-size-sm:   clamp(13px, 3.5vw, 14px);
    --font-size-base: clamp(15px, 4vw, 16px);
    --font-size-lg:   clamp(17px, 4.5vw, 18px);
    --font-size-xl:   clamp(19px, 5vw, 22px);
    --font-size-2xl:  clamp(22px, 5.5vw, 26px);
    --font-size-3xl:  clamp(26px, 6.5vw, 32px);
    --font-size-4xl:  clamp(30px, 8vw, 40px);

    /* Межстрочный интервал */
    --line-height-tight:   1.2;
    --line-height-normal:  1.5;
    --line-height-relaxed: 1.75;
    --line-height-base:    1.5;

    /* Трекинг (letter-spacing) */
    --tracking-tight:   -0.02em;
    --tracking-normal:   0;
    --tracking-wide:     0.02em;
    --tracking-wider:    0.05em;

    /* Вес шрифта */
    --font-weight-normal:   400;
    --font-weight-medium:   500;
    --font-weight-semibold: 600;
    --font-weight-bold:     700;
    --font-weight-extrabold: 800;

    /* ============================================
       SPACING SCALE
       ============================================ */
    --space-0:  0;
    --space-1:  0.25rem;  /* 4px */
    --space-2:  0.5rem;   /* 8px */
    --space-3:  0.75rem;  /* 12px */
    --space-4:  1rem;     /* 16px */
    --space-5:  1.25rem;  /* 20px */
    --space-6:  1.5rem;   /* 24px */
    --space-8:  2rem;     /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */

    /* Алиасы для совместимости */
    --spacing-xs: var(--space-1);
    --spacing-sm: var(--space-2);
    --spacing-md: var(--space-4);
    --spacing-lg: var(--space-6);
    --spacing-xl: var(--space-8);
    --spacing-2xl: var(--space-12);

    /* ============================================
       BORDER RADIUS
       ============================================ */
    --radius-sm:   0.25rem;  /* 4px */
    --radius-md:   0.5rem;   /* 8px */
    --radius-lg:   0.75rem;  /* 12px */
    --radius-xl:   1rem;     /* 16px */
    --radius-2xl:  1.5rem;   /* 24px */
    --radius-full: 9999px;

    /* ============================================
       SHADOWS
       ============================================ */
    --shadow-sm:  0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md:  0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg:  0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl:  0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

    /* ============================================
       TRANSITIONS & ANIMATIONS
       ============================================ */
    --transition-fast:   150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow:   400ms ease;
    --transition-premium: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* ============================================
       Z-INDEX SCALE
       ============================================ */
    --z-dropdown:  100;
    --z-sticky:    200;
    --z-overlay:   500;
    --z-modal:     9999;
    --z-toast:     10000;

    /* ============================================
       SIDEBAR
       ============================================ */
    --sidebar-width: 280px;
    --sidebar-width-collapsed: 72px;

    --line-height-base: 1.5;
    --primary-color: var(--accent, #6366f1);
    --secondary-color: var(--accent-secondary, #818cf8);
}

/* ============================================
   ALIASES for design-system.css compatibility
   ============================================ */
:root {
    --accent: var(--color-accent, #6366f1);
    --accent-secondary: #8b5cf6;
    --accent-hover: var(--color-primary-700, #4f46e5);
    --accent-light: rgba(99, 102, 241, 0.1);
    --success: var(--color-success-500, #10b981);
    --warning: var(--color-warning-500, #f59e0b);
    --danger: var(--color-danger-500, #ef4444);
    --text-primary: var(--color-primary-900, #0f172a);
    --text-secondary: #334155;
    --text-muted: #64748b;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-hover: #f1f5f9;
    --bg-tertiary: #f1f5f9;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.05);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --glass-blur: blur(12px);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --bg-glass: rgba(255, 255, 255, 0.8);
    --sidebar-glass: rgba(255, 255, 255, 0.95);
    --gradient-primary: linear-gradient(135deg, var(--accent) 0%, var(--accent-secondary) 100%);
    --header-height: 72px;
}

/* ============================================
   DARK THEME OVERRIDES
   ============================================ */
[data-theme="dark"] {
    --accent: #818cf8;
    --accent-hover: #6366f1;
    --accent-light: rgba(99, 102, 241, 0.15);
    --success: #34d399;
    --warning: #fbbf24;
    --danger: #f87171;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-hover: rgba(51, 65, 85, 0.5);
    --bg-tertiary: rgba(30, 41, 59, 0.5);
    --border-color: rgba(148, 163, 184, 0.1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
    --glass-blur: blur(16px);
    --glass-bg: rgba(15, 23, 42, 0.8);
    --glass-border: rgba(148, 163, 184, 0.1);
    --bg-glass: rgba(15, 23, 42, 0.7);
    --sidebar-glass: rgba(15, 23, 42, 0.95);
}

/* ── Theme Toggle Icon Visibility (CSS default, no JS flash) ─────────── */
html[data-theme="dark"] .sun-icon { display: none; }
html[data-theme="dark"] .moon-icon { display: inline-block; }
html[data-theme="light"] .sun-icon { display: inline-block; }
html[data-theme="light"] .moon-icon { display: none; }

/* Sidebar footer icons: ensure visible in both themes */
.sidebar-footer .theme-toggle,
.sidebar-footer .logout-btn {
    color: var(--text-secondary);
}
.sidebar-footer .theme-toggle svg,
.sidebar-footer .logout-btn svg,
.sidebar-footer .theme-toggle i,
.sidebar-footer .logout-btn i {
    width: 18px;
    height: 18px;
    stroke: currentColor;
}
/* ── Theme Toggle — акцентная кнопка, всегда видна ───────────────────── */
.theme-toggle {
    width: 40px !important;
    height: 40px !important;
    border-radius: 12px !important;
    border: 1px solid var(--border-color) !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    backdrop-filter: blur(8px) !important;
    -webkit-backdrop-filter: blur(8px) !important;
    flex-shrink: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
    position: relative;
}

.theme-toggle:hover {
    background: rgba(99, 102, 241, 0.25) !important;
    border-color: rgba(99, 102, 241, 0.5) !important;
}

.theme-toggle i,
.theme-toggle svg {
    width: 18px !important;
    height: 18px !important;
    color: inherit !important;
}

/* Sidebar footer — чуть больше */
.sidebar-footer .theme-toggle {
    width: 44px !important;
    height: 44px !important;
}

@media (max-width: 480px) {
    .theme-toggle {
        width: 44px !important;
        height: 44px !important;
    }
}