/* =================================================================
   SHMYO Ders Geri Bildirim Sistemi - Design System v2.0
   Kurumsal, Modern, Erişilebilir, WCAG 2.2 AA Uyumlu
   ================================================================= */

/* =================================================================
   DESIGN TOKENS - Renk, Tipografi, Spacing, Shadows
   ================================================================= */

:root {
  /* Giresun Üniversitesi SHMYO Kurumsal Renkleri */
  --primary-50: #EEF4FB;
  --primary-100: #D9E8F7;
  --primary-200: #B3D1EF;
  --primary-300: #8CB9E7;
  --primary-400: #66A2DF;
  --primary-500: #274185; /* Ana kurumsal mavi - C:100 M:90 Y:20 K:0 */
  --primary-600: #1F3468;
  --primary-700: #17274A;
  --primary-800: #0F1A2D;
  --primary-900: #070D17;

  /* Vurgu Renkleri - Yeşil */
  --accent-50: #EBF9EC;
  --accent-100: #D7F3D9;
  --accent-200: #AFE7B3;
  --accent-300: #87DB8D;
  --accent-400: #5FCF67;
  --accent-500: #39B54A; /* Vurgu yeşil - C:75 M:0 Y:100 K:0 */
  --accent-600: #2D9138;
  --accent-700: #226D2A;
  --accent-800: #16491C;
  --accent-900: #0B240E;

  /* Nötr Gri Tonları */
  --neutral-50: #F8FAFC;
  --neutral-100: #F1F5F9;
  --neutral-200: #E2E8F0;
  --neutral-300: #CBD5E1;
  --neutral-400: #94A3B8;
  --neutral-500: #64748B;
  --neutral-600: #475569;
  --neutral-700: #334155;
  --neutral-800: #1E293B;
  --neutral-900: #0F172A;

  /* Durum Renkleri */
  --success-50: #F0FDF4;
  --success-100: #DCFCE7;
  --success-500: #16A34A;
  --success-600: #059669;
  --success-700: #047857;

  --warning-50: #FFFBEB;
  --warning-100: #FEF3C7;
  --warning-500: #F59E0B;
  --warning-600: #D97706;
  --warning-700: #B45309;

  --error-50: #FEF2F2;
  --error-100: #FEE2E2;
  --error-500: #DC2626;
  --error-600: #B91C1C;
  --error-700: #991B1B;

  --info-50: #EFF6FF;
  --info-100: #DBEAFE;
  --info-500: #0284C7;
  --info-600: #0369A1;
  --info-700: #1D4ED8;

  /* Light Theme (Default) */
  --bg-primary: var(--neutral-50);
  --bg-secondary: #FFFFFF;
  --bg-tertiary: var(--neutral-100);
  --bg-card: #FFFFFF;
  --bg-overlay: rgba(15, 23, 42, 0.75);

  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-700);
  --text-tertiary: var(--neutral-500);
  --text-disabled: var(--neutral-400);
  --text-inverse: #FFFFFF;

  --border-primary: var(--neutral-200);
  --border-secondary: var(--neutral-300);
  --border-focus: var(--primary-500);

  /* Tipografi */
  --font-family-primary: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-family-mono: "SF Mono", Menlo, Monaco, "Cascadia Code", monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  /* Font Weights */
  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Spacing System - 8px Grid */
  --space-0: 0;
  --space-0-5: 0.125rem; /* 2px */
  --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 */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.25rem;  /* 4px */
  --radius-base: 0.5rem; /* 8px */
  --radius-md: 0.75rem;  /* 12px */
  --radius-lg: 1rem;     /* 16px */
  --radius-xl: 1.25rem;  /* 20px */
  --radius-2xl: 1.5rem;  /* 24px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

  /* Focus Ring */
  --focus-ring: 0 0 0 3px rgba(39, 65, 133, 0.2);
  --focus-ring-offset: 2px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;

  /* GSU Compatibility */
  --gsu-blue: var(--primary-500);
  --gsu-green: var(--accent-500);
  --gsu-blue-light: var(--primary-400);
  --gsu-blue-dark: var(--primary-700);
  --gsu-green-light: var(--accent-400);
  --gsu-green-dark: var(--accent-700);
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: var(--neutral-900);
  --bg-secondary: var(--neutral-800);
  --bg-tertiary: var(--neutral-700);
  --bg-card: var(--neutral-800);
  --bg-overlay: rgba(0, 0, 0, 0.75);

  --text-primary: var(--neutral-50);
  --text-secondary: var(--neutral-300);
  --text-tertiary: var(--neutral-400);
  --text-disabled: var(--neutral-500);
  --text-inverse: var(--neutral-900);

  --border-primary: var(--neutral-700);
  --border-secondary: var(--neutral-600);
}

/* Dark Theme - System Preference (only when no manual theme is set) */

/* =================================================================
   RESET & BASE STYLES
   ================================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Focus Management - WCAG 2.2 AA */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: var(--focus-ring-offset);
  border-radius: var(--radius-sm);
}

/* Skip Links for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-500);
  color: white;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-base);
  text-decoration: none;
  font-weight: var(--font-semibold);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 6px;
}

/* =================================================================
   TYPOGRAPHY SYSTEM
   ================================================================= */

/* Base Headings */
.h1, h1 {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.h2, h2 {
  font-size: var(--text-3xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-5);
}

.h3, h3 {
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.h4, h4 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.h5, h5 {
  font-size: var(--text-lg);
  font-weight: var(--font-medium);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

.h6, h6 {
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  line-height: var(--leading-normal);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Component Typography */
.page-title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.stat-value {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-none);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.stat-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: var(--leading-normal);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

/* =================================================================
   LAYOUT SYSTEM
   ================================================================= */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--space-4);
}

/* =================================================================
   COMPONENT UTILITIES
   ================================================================= */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* High Contrast Support */
@media (prefers-contrast: high) {
  :root {
    --border-primary: var(--neutral-900);
    --border-secondary: var(--neutral-800);
  }
}

/* Responsive Breakpoints */
@media (min-width: 48rem) {
  .container {
    padding: 0 var(--space-6);
  }
}

/* =================================================================
   DARK MODE FORM SUPPORT
   ================================================================= */

/* =================================================================
   GLOBAL BUTTON HOVER FIX
   Ensures text remains white on hover for colored buttons
   ================================================================= */
.btn-success:hover,
.btn-primary:hover,
.btn-danger:hover,
.btn-warning:hover,
.btn-info:hover {
  color: white !important;
}

/* Ensure button text is white by default */
.btn-success,
.btn-primary,
.btn-danger,
.btn-info {
  color: white;
}

.btn-warning {
  color: #1f2937;
}

.btn-warning:hover {
  color: #1f2937 !important;
}