/*
 * ═══════════════════════════════════════════════════════════════
 * SDSS for University — Habibi Tier
 * Design Tokens (Theme System)
 * ═══════════════════════════════════════════════════════════════
 * 
 * All visual properties are defined here as CSS custom properties.
 * To customize the theme, only modify this file.
 * 
 * Supports: Light Mode (default) and Dark Mode
 */

/* ─── Google Fonts ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ─── Root / Light Mode ────────────────────────────────────── */
:root {
    /* ── Primary Palette ── */
    --color-primary-h: 230;
    --color-primary-s: 70%;
    --color-primary-l: 55%;
    --color-primary: hsl(var(--color-primary-h), var(--color-primary-s), var(--color-primary-l));
    --color-primary-light: hsl(var(--color-primary-h), var(--color-primary-s), 92%);
    --color-primary-dark: hsl(var(--color-primary-h), var(--color-primary-s), 42%);
    --color-primary-hover: hsl(var(--color-primary-h), var(--color-primary-s), 48%);
    --color-primary-subtle: hsl(var(--color-primary-h), 40%, 96%);

    /* ── Secondary (Teal) ── */
    --color-secondary-h: 170;
    --color-secondary-s: 60%;
    --color-secondary-l: 42%;
    --color-secondary: hsl(var(--color-secondary-h), var(--color-secondary-s), var(--color-secondary-l));
    --color-secondary-light: hsl(var(--color-secondary-h), var(--color-secondary-s), 92%);
    --color-secondary-hover: hsl(var(--color-secondary-h), var(--color-secondary-s), 36%);

    /* ── Accent (Amber) ── */
    --color-accent-h: 35;
    --color-accent-s: 95%;
    --color-accent-l: 55%;
    --color-accent: hsl(var(--color-accent-h), var(--color-accent-s), var(--color-accent-l));
    --color-accent-light: hsl(var(--color-accent-h), 80%, 92%);
    --color-accent-hover: hsl(var(--color-accent-h), var(--color-accent-s), 48%);

    /* ── Semantic Colors ── */
    --color-success: hsl(150, 60%, 42%);
    --color-success-light: hsl(150, 50%, 92%);
    --color-warning: hsl(40, 95%, 55%);
    --color-warning-light: hsl(40, 80%, 92%);
    --color-danger: hsl(0, 75%, 55%);
    --color-danger-light: hsl(0, 60%, 94%);
    --color-info: hsl(200, 75%, 50%);
    --color-info-light: hsl(200, 60%, 93%);

    /* ── Surfaces & Backgrounds ── */
    --bg-body: hsl(220, 20%, 97%);
    --bg-surface: #ffffff;
    --bg-surface-hover: hsl(220, 15%, 95%);
    --bg-surface-raised: #ffffff;
    --bg-sidebar: hsl(230, 30%, 14%);
    --bg-sidebar-hover: hsl(230, 28%, 20%);
    --bg-sidebar-active: hsl(230, 35%, 25%);
    --bg-topbar: rgba(255, 255, 255, 0.85);
    --bg-glass: rgba(255, 255, 255, 0.7);
    --bg-overlay: rgba(0, 0, 0, 0.4);
    --bg-input: hsl(220, 15%, 96%);

    /* ── Text ── */
    --text-primary: hsl(225, 25%, 15%);
    --text-secondary: hsl(220, 15%, 45%);
    --text-tertiary: hsl(220, 10%, 62%);
    --text-inverse: #ffffff;
    --text-sidebar: hsl(220, 20%, 75%);
    --text-sidebar-hover: #ffffff;
    --text-sidebar-active: #ffffff;
    --text-sidebar-category: hsl(220, 15%, 50%);
    --text-link: var(--color-primary);

    /* ── Borders ── */
    --border-color: hsl(220, 15%, 90%);
    --border-color-light: hsl(220, 15%, 94%);
    --border-color-focus: var(--color-primary);

    /* ── Shadows ── */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-card-hover: 0 8px 25px -5px rgba(0, 0, 0, 0.1), 0 4px 10px -3px rgba(0, 0, 0, 0.05);
    --shadow-sidebar: 4px 0 15px rgba(0, 0, 0, 0.05);

    /* ── Spacing Scale ── */
    --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 */

    /* ── Border Radius ── */
    --radius-sm: 0.375rem;   /* 6px */
    --radius-md: 0.625rem;   /* 10px */
    --radius-lg: 0.875rem;   /* 14px */
    --radius-xl: 1.125rem;   /* 18px */
    --radius-2xl: 1.5rem;    /* 24px */
    --radius-full: 9999px;

    /* ── Typography ── */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', monospace;

    --text-xs: 0.75rem;     /* 12px */
    --text-sm: 0.8125rem;   /* 13px */
    --text-base: 0.875rem;  /* 14px */
    --text-md: 0.9375rem;   /* 15px */
    --text-lg: 1.0625rem;   /* 17px */
    --text-xl: 1.25rem;     /* 20px */
    --text-2xl: 1.5rem;     /* 24px */
    --text-3xl: 1.875rem;   /* 30px */
    --text-4xl: 2.25rem;    /* 36px */

    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.7;

    --weight-light: 300;
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --weight-extrabold: 800;

    /* ── Layout ── */
    --sidebar-width: 270px;
    --sidebar-collapsed-width: 72px;
    --topbar-height: 64px;
    --mobile-nav-height: 64px;
    --content-max-width: 1400px;

    /* ── Transitions ── */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-spring: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* ── Z-index layers ── */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-sidebar: 300;
    --z-overlay: 400;
    --z-modal: 500;
    --z-tooltip: 600;
    --z-toast: 700;

    /* ── Modal Overlay (Global) ── */
    /* This defines the base styling for .modal-overlay so that it can be used across all pages */
}

/* ─── Global Component Styles ──────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    background: var(--bg-surface);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 500px;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px);
    transition: transform var(--transition-base);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-overlay.active .modal-container {
    transform: translateY(0);
}

:root {
    /* ── Gradient Presets ── */
    --gradient-primary: linear-gradient(135deg, hsl(230, 70%, 55%), hsl(260, 65%, 55%));
    --gradient-secondary: linear-gradient(135deg, hsl(170, 60%, 42%), hsl(190, 55%, 45%));
    --gradient-accent: linear-gradient(135deg, hsl(35, 95%, 55%), hsl(20, 90%, 55%));
    --gradient-hero: linear-gradient(135deg, hsl(230, 70%, 50%), hsl(260, 60%, 55%), hsl(290, 50%, 55%));
    --gradient-card-shine: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 50%);
    --gradient-surface: linear-gradient(180deg, hsl(220, 20%, 97%), hsl(220, 15%, 95%));
}

/* ─── Dark Mode ────────────────────────────────────────────── */
[data-theme="dark"] {
    /* ── Primary Palette (Brighter for dark bg) ── */
    --color-primary-l: 65%;
    --color-primary-light: hsl(var(--color-primary-h), 40%, 20%);
    --color-primary-dark: hsl(var(--color-primary-h), var(--color-primary-s), 75%);
    --color-primary-hover: hsl(var(--color-primary-h), var(--color-primary-s), 60%);
    --color-primary-subtle: hsl(var(--color-primary-h), 25%, 16%);

    /* ── Secondary ── */
    --color-secondary-l: 52%;
    --color-secondary-light: hsl(var(--color-secondary-h), 35%, 18%);
    --color-secondary-hover: hsl(var(--color-secondary-h), var(--color-secondary-s), 46%);

    /* ── Accent ── */
    --color-accent-l: 62%;
    --color-accent-light: hsl(var(--color-accent-h), 45%, 18%);
    --color-accent-hover: hsl(var(--color-accent-h), var(--color-accent-s), 55%);

    /* ── Semantic ── */
    --color-success: hsl(150, 55%, 50%);
    --color-success-light: hsl(150, 30%, 16%);
    --color-warning: hsl(40, 90%, 60%);
    --color-warning-light: hsl(40, 40%, 16%);
    --color-danger: hsl(0, 70%, 60%);
    --color-danger-light: hsl(0, 35%, 16%);
    --color-info: hsl(200, 70%, 58%);
    --color-info-light: hsl(200, 35%, 16%);

    /* ── Surfaces ── */
    --bg-body: hsl(225, 25%, 9%);
    --bg-surface: hsl(225, 22%, 13%);
    --bg-surface-hover: hsl(225, 20%, 17%);
    --bg-surface-raised: hsl(225, 20%, 16%);
    --bg-sidebar: hsl(225, 30%, 7%);
    --bg-sidebar-hover: hsl(225, 28%, 14%);
    --bg-sidebar-active: hsl(225, 32%, 18%);
    --bg-topbar: rgba(17, 19, 30, 0.88);
    --bg-glass: rgba(20, 22, 35, 0.75);
    --bg-overlay: rgba(0, 0, 0, 0.6);
    --bg-input: hsl(225, 20%, 16%);

    /* ── Text ── */
    --text-primary: hsl(220, 20%, 92%);
    --text-secondary: hsl(220, 12%, 62%);
    --text-tertiary: hsl(220, 8%, 48%);
    --text-sidebar: hsl(220, 15%, 60%);
    --text-sidebar-category: hsl(220, 12%, 42%);

    /* ── Borders ── */
    --border-color: hsl(225, 18%, 20%);
    --border-color-light: hsl(225, 15%, 16%);

    /* ── Shadows (softer in dark mode) ── */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.15);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.25), 0 2px 4px -1px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.35), 0 10px 10px -5px rgba(0, 0, 0, 0.15);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 255, 255, 0.03);
    --shadow-card-hover: 0 8px 25px -5px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.05);
    --shadow-sidebar: 4px 0 15px rgba(0, 0, 0, 0.3);

    /* ── Gradients ── */
    --gradient-primary: linear-gradient(135deg, hsl(230, 65%, 40%), hsl(260, 55%, 42%));
    --gradient-secondary: linear-gradient(135deg, hsl(170, 55%, 32%), hsl(190, 50%, 35%));
    --gradient-accent: linear-gradient(135deg, hsl(35, 85%, 45%), hsl(20, 80%, 45%));
    --gradient-hero: linear-gradient(135deg, hsl(230, 60%, 30%), hsl(260, 50%, 35%), hsl(290, 40%, 35%));
    --gradient-surface: linear-gradient(180deg, hsl(225, 25%, 9%), hsl(225, 22%, 11%));
}

/* ─── Reduced Motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    :root {
        --transition-fast: 0ms;
        --transition-base: 0ms;
        --transition-slow: 0ms;
        --transition-spring: 0ms;
    }
}