/* ============================================
   LERN AKADEMİ — Design System v2.0
   "Canlı & Premium" — elektrik indigo → menekşe
   Tüm platform (EJS + React) için ortak CSS.
   Not: Değişken ve sınıf adları v1 ile birebir aynıdır;
   yalnızca değerler ve bileşen stilleri yenilenmiştir, böylece
   mevcut sayfalar dokunulmadan yeni görünüme geçer.
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Primary — elektrik indigo */
  --color-primary-50: #EEECFE;
  --color-primary-100: #DAD5FB;
  --color-primary-200: #BCB1F8;
  --color-primary-300: #9B8AF4;
  --color-primary-400: #7B63F2;
  --color-primary-500: #5B4BF0;
  --color-primary-600: #4B37D9;
  --color-primary-700: #3D2BB3;
  --color-primary-800: #2E2088;
  --color-primary-900: #221869;

  /* Secondary — menekşe vurgu */
  --color-secondary-50: #FAF0FF;
  --color-secondary-100: #F3E0FF;
  --color-secondary-200: #E6C4FF;
  --color-secondary-300: #D49BFB;
  --color-secondary-400: #C06FF8;
  --color-secondary-500: #A855F7;
  --color-secondary-600: #9333EA;

  /* Success — emerald */
  --color-success-50: #ECFDF5;
  --color-success-500: #10B981;
  --color-success-600: #059669;

  /* Danger — rose */
  --color-danger-50: #FFF1F2;
  --color-danger-500: #F43F5E;
  --color-danger-600: #E11D48;

  /* Warning — amber */
  --color-warning-50: #FFFBEB;
  --color-warning-500: #F59E0B;
  --color-warning-600: #D97706;

  /* Info — sky */
  --color-info-50: #F0F9FF;
  --color-info-500: #0EA5E9;

  /* Neutral — mor tonlu (saf gri değil) */
  --color-neutral-50: #FFFFFF;
  --color-neutral-100: #F6F5FB;
  --color-neutral-200: #E7E4F0;
  --color-neutral-300: #D6D1E6;
  --color-neutral-400: #9A93B0;
  --color-neutral-500: #6B6580;
  --color-neutral-600: #4A4560;
  --color-neutral-700: #332E47;
  --color-neutral-800: #241F38;
  --color-neutral-900: #1C1830;

  /* Uygulama arka planı — kartlardan (neutral-50=beyaz) bir ton koyu */
  --color-bg: #F6F5FB;

  /* İmza gradient'ler */
  --gradient-brand: linear-gradient(135deg, #5B4BF0 0%, #A855F7 55%, #D946EF 100%);
  --gradient-soft: linear-gradient(135deg, rgba(91,75,240,.12), rgba(168,85,247,.10));
  --gradient-gold: linear-gradient(135deg, #FBBF24, #F59E0B);

  /* Gamification */
  --color-bronze: #D89B6A;
  --color-silver: #C0C0C0;
  --color-gold: #FBBF24;
  --color-diamond: #38BDF8;
  --color-platinum: #E5E4E2;

  /* Mastery */
  --color-mastery-mastered: #10B981;
  --color-mastery-practicing: #F59E0B;
  --color-mastery-learning: #F43F5E;
  --color-mastery-not-started: #D6D1E6;

  /* League */
  --color-league-bronze: #D89B6A;
  --color-league-silver: #A8A9AD;
  --color-league-gold: #FBBF24;
  --color-league-platinum: #00CED1;
  --color-league-diamond: #9370DB;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-display: 'Plus Jakarta Sans', 'Inter', var(--font-sans);

  --text-xs: clamp(0.625rem, 0.6rem + 0.1vw, 0.75rem);
  --text-sm: clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);
  --text-base: clamp(0.875rem, 0.8rem + 0.3vw, 1rem);
  --text-lg: clamp(1rem, 0.9rem + 0.4vw, 1.125rem);
  --text-xl: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);
  --text-2xl: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --text-3xl: clamp(1.5rem, 1.3rem + 0.8vw, 1.875rem);
  --text-4xl: clamp(1.875rem, 1.6rem + 1vw, 2.25rem);

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  --leading-tight: 1.2;
  --leading-normal: 1.55;
  --leading-relaxed: 1.75;
  --tracking-tight: -0.02em;

  /* Spacing */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Border Radius — daha yuvarlak, premium */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.75rem;
  --radius-full: 9999px;

  /* Shadows — mor tonlu, renkli glow */
  --shadow-sm: 0 1px 2px rgba(28,24,48,.06);
  --shadow-md: 0 6px 16px -6px rgba(28,24,48,.14);
  --shadow-lg: 0 16px 40px -12px rgba(28,24,48,.20);
  --shadow-xl: 0 24px 50px -12px rgba(28,24,48,.26);
  --shadow-glow: 0 12px 30px -8px rgba(91,75,240,.45);
  --shadow-glow-gold: 0 10px 26px -8px rgba(251,191,36,.5);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(.4,0,.2,1);
  --transition-normal: 250ms cubic-bezier(.4,0,.2,1);
  --transition-slow: 350ms cubic-bezier(.4,0,.2,1);

  /* Layout */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --sidebar-collapsed: 64px;
  --sidebar-expanded: 256px;
  --header-height-mobile: 56px;
  --header-height-desktop: 64px;
  --bottom-nav-height: 64px;
}

/* ---------- Dark Mode ---------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-neutral-50: #17142A;
    --color-neutral-100: #1F1B38;
    --color-neutral-200: #2C2748;
    --color-neutral-300: #3A3560;
    --color-neutral-400: #6E6890;
    --color-neutral-500: #9A93B8;
    --color-neutral-600: #C4BEDC;
    --color-neutral-700: #E5E1F2;
    --color-neutral-800: #F0EEF9;
    --color-neutral-900: #F3F1FB;
    --color-bg: #0D0B18;
    --gradient-soft: linear-gradient(135deg, rgba(123,99,242,.22), rgba(168,85,247,.15));
    --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
    --shadow-md: 0 6px 16px -6px rgba(0,0,0,.5);
    --shadow-lg: 0 20px 44px -12px rgba(0,0,0,.6);
    --shadow-xl: 0 26px 54px -12px rgba(0,0,0,.7);
    --shadow-glow: 0 14px 34px -8px rgba(123,99,242,.55);
  }
}
[data-theme="dark"] {
  --color-neutral-50: #17142A;
  --color-neutral-100: #1F1B38;
  --color-neutral-200: #2C2748;
  --color-neutral-300: #3A3560;
  --color-neutral-400: #6E6890;
  --color-neutral-500: #9A93B8;
  --color-neutral-600: #C4BEDC;
  --color-neutral-700: #E5E1F2;
  --color-neutral-800: #F0EEF9;
  --color-neutral-900: #F3F1FB;
  --color-bg: #0D0B18;
  --gradient-soft: linear-gradient(135deg, rgba(123,99,242,.22), rgba(168,85,247,.15));
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 6px 16px -6px rgba(0,0,0,.5);
  --shadow-lg: 0 20px 44px -12px rgba(0,0,0,.6);
  --shadow-xl: 0 26px 54px -12px rgba(0,0,0,.7);
  --shadow-glow: 0 14px 34px -8px rgba(123,99,242,.55);
}
[data-theme="light"] {
  --color-neutral-50: #FFFFFF;
  --color-neutral-100: #F6F5FB;
  --color-neutral-200: #E7E4F0;
  --color-neutral-300: #D6D1E6;
  --color-neutral-400: #9A93B0;
  --color-neutral-500: #6B6580;
  --color-neutral-600: #4A4560;
  --color-neutral-700: #332E47;
  --color-neutral-800: #241F38;
  --color-neutral-900: #1C1830;
  --color-bg: #F6F5FB;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-neutral-900);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01";
}

/* ---------- Typography ---------- */
h1 { font-family: var(--font-display); font-size: var(--text-4xl); font-weight: var(--font-extrabold); line-height: var(--leading-tight); letter-spacing: var(--tracking-tight); }
h2 { font-family: var(--font-display); font-size: var(--text-3xl); font-weight: var(--font-extrabold); line-height: var(--leading-tight); letter-spacing: var(--tracking-tight); }
h3 { font-family: var(--font-display); font-size: var(--text-2xl); font-weight: var(--font-bold); letter-spacing: var(--tracking-tight); }
h4 { font-family: var(--font-display); font-size: var(--text-xl); font-weight: var(--font-bold); }
a { color: var(--color-primary-600); text-decoration: none; }
a:hover { text-decoration: underline; }
.tabular, .tnum { font-variant-numeric: tabular-nums; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: inherit; font-size: var(--text-sm); font-weight: var(--font-bold);
  border-radius: var(--radius-md); border: 1px solid transparent;
  cursor: pointer; transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
  min-height: 44px; min-width: 44px;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--gradient-brand); color: #fff; box-shadow: var(--shadow-glow); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -10px rgba(91,75,240,.6); }
.btn-secondary { background: var(--color-neutral-100); color: var(--color-neutral-800); border-color: var(--color-neutral-200); }
.btn-secondary:hover { background: var(--color-neutral-200); }
.btn-outline { border-color: var(--color-neutral-300); color: var(--color-neutral-700); background: var(--color-neutral-50); }
.btn-outline:hover { border-color: var(--color-primary-400); color: var(--color-primary-600); }
.btn-danger { background: var(--color-danger-500); color: white; }
.btn-danger:hover { background: var(--color-danger-600); }
.btn-success { background: var(--color-success-500); color: white; }
.btn-success:hover { background: var(--color-success-600); }
.btn-ghost { background: transparent; color: var(--color-neutral-600); }
.btn-ghost:hover { background: var(--gradient-soft); color: var(--color-primary-600); }
.btn-gold { background: var(--gradient-gold); color: #3a2c00; box-shadow: var(--shadow-glow-gold); }
.btn-gold:hover { transform: translateY(-2px); }
.btn-sm { min-height: 36px; padding: var(--space-1) var(--space-3); font-size: var(--text-xs); }
.btn-lg { padding: var(--space-3) var(--space-6); font-size: var(--text-lg); }

/* ---------- Cards ---------- */
.card {
  background: var(--color-neutral-50); border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-xl); padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}
.card-hover { transition: transform var(--transition-normal), box-shadow var(--transition-normal); }
.card-hover:hover { box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.card-gradient { background: var(--gradient-brand); color: #fff; border: none; box-shadow: var(--shadow-glow); }

/* ---------- Inputs ---------- */
.input {
  width: 100%; padding: var(--space-2) var(--space-3);
  font-size: var(--text-sm); border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-md); background: var(--color-neutral-50);
  color: var(--color-neutral-900); min-height: 44px;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.input::placeholder { color: var(--color-neutral-400); }
.input:focus { outline: none; border-color: var(--color-primary-500); box-shadow: 0 0 0 3px var(--color-primary-100); }
.input-error { border-color: var(--color-danger-500); }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex; align-items: center; gap: var(--space-1); padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs); font-weight: var(--font-bold);
  border-radius: var(--radius-full);
}
.badge-primary { background: var(--gradient-soft); color: var(--color-primary-600); }
.badge-success { background: var(--color-success-50); color: var(--color-success-600); }
.badge-danger { background: var(--color-danger-50); color: var(--color-danger-600); }
.badge-warning { background: var(--color-warning-50); color: var(--color-warning-600); }
.badge-info { background: var(--color-info-50); color: var(--color-info-500); }

/* ---------- Modals ---------- */
.modal-overlay { position: fixed; inset: 0; background: rgba(13,11,24,0.55); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal-content { background: var(--color-neutral-50); border: 1px solid var(--color-neutral-200); border-radius: var(--radius-2xl); padding: var(--space-6); max-width: 90vw; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-xl); }
.modal-bottom-sheet { position: fixed; bottom: 0; left: 0; right: 0; border-radius: var(--radius-2xl) var(--radius-2xl) 0 0; padding: var(--space-4); }

/* ---------- Skeleton ---------- */
.skeleton { background: linear-gradient(90deg, var(--color-neutral-200) 25%, var(--color-neutral-100) 50%, var(--color-neutral-200) 75%); background-size: 200% 100%; animation: skeleton-loading 1.5s infinite; border-radius: var(--radius-md); }
.skeleton-text { height: 1em; margin-bottom: var(--space-2); }
@keyframes skeleton-loading { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* ---------- Spinner ---------- */
.spinner { width: 24px; height: 24px; border: 3px solid var(--color-neutral-200); border-top-color: var(--color-primary-500); border-radius: 50%; animation: spin 0.6s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Progress ---------- */
.progress { height: 9px; background: var(--color-neutral-200); border-radius: var(--radius-full); overflow: hidden; }
.progress-bar { height: 100%; background: var(--gradient-brand); border-radius: var(--radius-full); transition: width var(--transition-slow); }

/* ---------- Toast ---------- */
.toast { position: fixed; bottom: var(--space-4); right: var(--space-4); padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); color: white; z-index: 200; box-shadow: var(--shadow-lg); animation: slideUp 0.3s ease; }
.toast-success { background: var(--color-success-600); }
.toast-error { background: var(--color-danger-600); }
@keyframes slideUp { from { transform: translateY(100%); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* ---------- Responsive Grid ---------- */
.container { width: 100%; max-width: var(--container-xl); margin: 0 auto; padding: 0 var(--space-4); }
.row { display: flex; flex-wrap: wrap; margin: 0 calc(-1 * var(--space-2)); }
.col { flex: 1; padding: 0 var(--space-2); }
@media (min-width: 768px) { .col-md-6 { flex: 0 0 50%; } }
@media (min-width: 1024px) { .col-lg-4 { flex: 0 0 33.333%; } .col-lg-3 { flex: 0 0 25%; } }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.text-sm { font-size: var(--text-sm); }
.text-lg { font-size: var(--text-lg); }
.text-muted { color: var(--color-neutral-500); }
.font-bold { font-weight: var(--font-bold); }
.gradient-text { background: var(--gradient-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.p-4 { padding: var(--space-4); }
.hidden-mobile { display: none; }
@media (min-width: 768px) { .hidden-mobile { display: block; } .show-mobile { display: none; } }

/* ---------- Search hero ---------- */
.search-hero { position: relative; margin-bottom: var(--space-6); }
.search-hero i, .search-hero .fa-search { position: absolute; left: 18px; top: 50%; transform: translateY(-50%); color: var(--color-neutral-400); font-size: 15px; pointer-events: none; }
.search-hero-input {
  width: 100%; height: 54px; padding: 0 20px 0 46px;
  font-size: var(--text-base); font-family: inherit; color: var(--color-neutral-900);
  background: var(--color-neutral-50); border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-xl); box-shadow: var(--shadow-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.search-hero-input::placeholder { color: var(--color-neutral-400); }
.search-hero-input:focus { outline: none; border-color: var(--color-primary-400); box-shadow: 0 0 0 4px var(--color-primary-100); }

/* ---------- Empty state ---------- */
.empty-state { display: flex; flex-direction: column; align-items: center; text-align: center; gap: var(--space-2); padding: var(--space-12) var(--space-6); }
.empty-state .es-ico { width: 76px; height: 76px; border-radius: var(--radius-2xl); display: grid; place-items: center; font-size: 34px; background: var(--gradient-soft); margin-bottom: var(--space-3); }
.empty-state h3 { font-family: var(--font-display); font-weight: var(--font-bold); }
.empty-state p { color: var(--color-neutral-500); max-width: 46ch; }

/* ---------- Card grid + tool card ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--space-4); }
.tool-card { display: flex; flex-direction: column; gap: var(--space-2); text-decoration: none; color: inherit; position: relative; text-align: left; width: 100%; }
.tool-card:hover { text-decoration: none; }
.tool-card .tc-head { display: flex; align-items: center; gap: var(--space-3); }
.tool-card h3, .tool-card .tc-title { font-family: var(--font-display); font-size: var(--text-lg); font-weight: var(--font-bold); margin: 0; }
.tool-card .tc-desc { font-size: var(--text-sm); color: var(--color-neutral-500); margin: 0; }
.tool-card .tc-meta { font-size: var(--text-xs); color: var(--color-neutral-400); margin: var(--space-1) 0 0; }
.tool-card .tc-chevron { position: absolute; top: var(--space-4); right: var(--space-4); color: var(--color-neutral-300); font-size: 20px; line-height: 1; transition: transform var(--transition-fast), color var(--transition-fast); }
.tool-card:hover .tc-chevron { transform: translateX(3px); color: var(--color-primary-500); }
.tool-ico { width: 46px; height: 46px; border-radius: var(--radius-lg); display: grid; place-items: center; font-size: 22px; background: var(--gradient-soft); flex-shrink: 0; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; } }