/* ============================================================
   IMARBIS — Tasarım Sistemi
   Sprint 5: Modern UI temeli (CSS değişkenleri + sidebar layout)
   ============================================================ */

:root {
  /* Renk paleti — Mapisso E-Başvuru'ya uyumlu (mor ana renk) */
  --color-primary:        #6f42c1;
  --color-primary-600:    #5a32a3;
  --color-primary-100:    #efe7ff;
  --color-primary-50:     #f7f3ff;

  --color-success:        #198754;
  --color-success-100:    #d1e7dd;
  --color-warning:        #f59e0b;
  --color-warning-100:    #fff3cd;
  --color-danger:         #dc3545;
  --color-danger-100:     #f8d7da;
  --color-info:           #0dcaf0;
  --color-info-100:       #cff4fc;

  --color-text:           #1f2937;
  --color-text-muted:     #6b7280;
  --color-text-soft:      #9ca3af;

  --color-bg:             #f5f6fa;
  --color-surface:        #ffffff;
  --color-surface-alt:    #f8f9fa;
  --color-border:         #e5e7eb;
  --color-border-soft:    #f1f3f5;

  /* Tipografi */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
               'Helvetica Neue', Arial, sans-serif;
  --font-size-xs:   .75rem;
  --font-size-sm:   .875rem;
  --font-size-base: .9375rem;
  --font-size-lg:   1.0625rem;
  --font-size-xl:   1.25rem;
  --font-size-2xl:  1.5rem;
  --font-size-3xl:  1.875rem;
  --line-height-tight: 1.3;
  --line-height-base:  1.55;

  /* Boşluklar */
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;

  /* Kenar radius */
  --radius-sm: 6px;
  --radius:    8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Gölgeler */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, .04);
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, .07), 0 1px 2px rgba(15, 23, 42, .04);
  --shadow:    0 4px 6px -1px rgba(15, 23, 42, .07), 0 2px 4px -2px rgba(15, 23, 42, .04);
  --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, .08), 0 4px 6px -4px rgba(15, 23, 42, .05);

  /* Layout */
  --sidebar-width: 250px;
  --sidebar-width-collapsed: 64px;
  --topbar-height: 60px;
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================================
   Temel reset / tipografi
   ============================================================ */

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  margin: 0 0 var(--space-3);
}
h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); font-weight: 600; }
h6 { font-size: var(--font-size-sm); font-weight: 600; text-transform: uppercase; letter-spacing: .04em; color: var(--color-text-muted); }

a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-base); }
a:hover { color: var(--color-primary-600); }

.text-muted   { color: var(--color-text-muted) !important; }
.text-soft    { color: var(--color-text-soft) !important; }
.text-primary { color: var(--color-primary) !important; }
.text-success { color: var(--color-success) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-danger  { color: var(--color-danger) !important; }

/* ============================================================
   Layout: Sidebar + Topbar + Content
   ============================================================ */

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--topbar-height) 1fr;
  grid-template-areas:
    "sidebar topbar"
    "sidebar content";
  min-height: 100vh;
}

.app-sidebar {
  grid-area: sidebar;
  background: linear-gradient(180deg, #1f1933 0%, #2a2347 100%);
  color: #e2e8f0;
  position: sticky; top: 0; height: 100vh;
  overflow-y: auto;
  padding: var(--space-4) 0;
  display: flex;
  flex-direction: column;
}

.app-sidebar .brand {
  display: flex; align-items: center; gap: var(--space-3);
  padding: 0 var(--space-5) var(--space-5);
  border-bottom: 1px solid rgba(255,255,255,.08);
  color: #fff;
  text-decoration: none;
}
.app-sidebar .brand-mark {
  width: 36px; height: 36px; border-radius: var(--radius);
  background: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 16px;
}
.app-sidebar .brand-name { font-weight: 700; font-size: 1.05rem; }
.app-sidebar .brand-sub  { font-size: .7rem; color: #a3a3bd; letter-spacing: .04em; text-transform: uppercase; }

.app-sidebar .nav-section {
  padding: var(--space-4) 0 var(--space-2);
}
.app-sidebar .nav-label {
  font-size: .7rem; text-transform: uppercase; letter-spacing: .08em;
  color: #6b6b8a; padding: 0 var(--space-5) var(--space-2);
  font-weight: 600;
}
.app-sidebar .nav-item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-2) var(--space-5);
  color: #c7c7d9;
  font-size: .9rem;
  font-weight: 500;
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all var(--transition-base);
}
.app-sidebar .nav-item:hover {
  background: rgba(255,255,255,.04);
  color: #fff;
}
.app-sidebar .nav-item.active {
  background: rgba(111, 66, 193, .15);
  color: #fff;
  border-left-color: var(--color-primary);
}
.app-sidebar .nav-item i {
  width: 18px; text-align: center; font-size: 0.95rem;
  color: #8b8ba9;
}
.app-sidebar .nav-item.active i { color: var(--color-primary); }
.app-sidebar .nav-item:hover i  { color: #fff; }

.app-sidebar .sidebar-footer {
  margin-top: auto;
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid rgba(255,255,255,.08);
  font-size: .75rem;
  color: #8b8ba9;
}

.app-topbar {
  grid-area: topbar;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 var(--space-6);
  position: sticky; top: 0; z-index: 100;
  box-shadow: var(--shadow-xs);
}
.app-topbar .topbar-title {
  font-weight: 600; font-size: 1rem; color: var(--color-text);
}
.app-topbar .topbar-actions {
  display: flex; align-items: center; gap: var(--space-3);
}

.app-content {
  grid-area: content;
  padding: var(--space-6);
  overflow-x: auto;
}

/* ============================================================
   Card sistemi (Bootstrap üstüne polish)
   ============================================================ */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  margin-bottom: var(--space-5);
}
.card-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-soft);
  padding: var(--space-4) var(--space-5);
  border-top-left-radius: var(--radius-lg);
  border-top-right-radius: var(--radius-lg);
  font-weight: 600;
}
.card-body { padding: var(--space-5); }

/* ============================================================
   Butonlar (Bootstrap'i override eder)
   ============================================================ */

.btn {
  font-weight: 500;
  border-radius: var(--radius);
  padding: .5rem 1rem;
  transition: all var(--transition-base);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
}
.btn:focus { box-shadow: 0 0 0 3px rgba(111, 66, 193, .15); }

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-600);
  border-color: var(--color-primary-600);
}
.btn-outline-primary {
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline-primary:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}
.btn-sm { padding: .3rem .65rem; font-size: var(--font-size-xs); }
.btn-lg { padding: .65rem 1.25rem; font-size: var(--font-size-base); }

/* ============================================================
   Form kontrolleri
   ============================================================ */

.form-control, .form-select {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: .5rem .75rem;
  font-size: var(--font-size-sm);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}
.form-control:focus, .form-select:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(111, 66, 193, .12);
  outline: 0;
}
.form-label {
  font-weight: 500;
  font-size: var(--font-size-sm);
  margin-bottom: .35rem;
  color: var(--color-text);
}

/* ============================================================
   Badge / etiketler
   ============================================================ */

.badge {
  font-weight: 500;
  font-size: var(--font-size-xs);
  padding: .35em .6em;
  border-radius: var(--radius-sm);
  letter-spacing: .01em;
}

/* ============================================================
   Tablo
   ============================================================ */

.table {
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}
.table > :not(caption) > * > * {
  padding: var(--space-3) var(--space-4);
  border-bottom-color: var(--color-border-soft);
}
.table > thead {
  background: var(--color-surface-alt);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
  color: var(--color-text-muted);
}
.table-hover tbody tr:hover { background: var(--color-primary-50); }

/* ============================================================
   Stat / metric kartları (anasayfa)
   ============================================================ */

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex; align-items: center; gap: var(--space-4);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  text-decoration: none; color: inherit;
}
.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  color: inherit;
}
.stat-card .stat-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}
.stat-card .stat-icon.warning { background: var(--color-warning-100); color: var(--color-warning); }
.stat-card .stat-icon.success { background: var(--color-success-100); color: var(--color-success); }
.stat-card .stat-icon.danger  { background: var(--color-danger-100);  color: var(--color-danger); }
.stat-card .stat-icon.muted   { background: #e5e7eb; color: var(--color-text-muted); }
.stat-card .stat-icon.primary { background: var(--color-primary-100); color: var(--color-primary); }

.stat-card .stat-value {
  font-size: 1.75rem; font-weight: 700; line-height: 1;
  color: var(--color-text);
}
.stat-card .stat-label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--color-text-muted);
  margin-top: .25rem;
  font-weight: 500;
}

/* ============================================================
   Yardımcılar
   ============================================================ */

.page-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: var(--space-5);
  flex-wrap: wrap; gap: var(--space-3);
}
.page-header h1 { margin: 0; }
.page-header .page-subtitle { color: var(--color-text-muted); margin-top: .25rem; font-size: var(--font-size-sm); }

.section-divider {
  border: 0; border-top: 1px solid var(--color-border-soft);
  margin: var(--space-6) 0;
}

/* Bildirim noktası */
.notification-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-danger);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-10) var(--space-6);
  color: var(--color-text-muted);
}
.empty-state i {
  font-size: 56px; opacity: .25;
  margin-bottom: var(--space-3);
  display: block;
}

/* ============================================================
   Responsive — sidebar mobile davranışı
   ============================================================ */

@media (max-width: 992px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas:
      "topbar"
      "content";
  }
  .app-sidebar {
    position: fixed;
    top: 0; left: 0;
    width: var(--sidebar-width);
    z-index: 200;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-lg);
  }
  .app-shell.sidebar-open .app-sidebar {
    transform: translateX(0);
  }
  .sidebar-overlay {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 150;
  }
  .app-shell.sidebar-open .sidebar-overlay {
    display: block;
  }
  .sidebar-toggle { display: inline-flex !important; }
}

.sidebar-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-border);
  width: 36px; height: 36px;
  border-radius: var(--radius);
  align-items: center; justify-content: center;
  cursor: pointer;
}
.sidebar-toggle:hover { background: var(--color-surface-alt); }

/* ============================================================
   User menu (topbar dropdown)
   ============================================================ */

.user-menu-trigger {
  display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--color-text);
}
.user-menu-trigger:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-border);
}
.user-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 13px;
}
.user-name {
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.notification-bell {
  position: relative;
  width: 36px; height: 36px;
  border-radius: var(--radius);
  display: flex; align-items: center; justify-content: center;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: background var(--transition-base);
}
.notification-bell:hover { background: var(--color-surface-alt); color: var(--color-text); }
.notification-bell .bell-badge {
  position: absolute; top: 4px; right: 4px;
  background: var(--color-danger);
  color: #fff;
  border-radius: 10px;
  font-size: 10px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  display: flex; align-items: center; justify-content: center;
  font-weight: 600;
}