/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-input: #0f172a;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-glow: rgba(59, 130, 246, 0.2);
  --success: #22c55e;
  --warning: #eab308;
  --danger: #ef4444;
  --info: #06b6d4;
  --border: #334155;
  --sidebar-w: 260px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px; border-radius: var(--radius-sm); font-size: 0.9rem;
  font-weight: 600; border: none; cursor: pointer; transition: all var(--transition);
  font-family: inherit; white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; }
.btn-outline { background: transparent; color: var(--text-primary); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; color: #fff; }
.btn-sm { padding: 6px 14px; font-size: 0.82rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Badges ===== */
.badge {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 0.78rem; font-weight: 600;
}
.badge-success { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-danger { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge-warning { background: rgba(234,179,8,0.15); color: var(--warning); }
.badge-info { background: rgba(6,182,212,0.15); color: var(--info); }
.badge-muted { background: rgba(100,116,139,0.15); color: var(--text-muted); }

/* ===== Forms ===== */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 6px; color: var(--text-secondary); }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 10px 14px; background: var(--bg-input);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text-primary); font-size: 0.9rem; font-family: inherit;
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group input::placeholder { color: var(--text-muted); }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
.form-error {
  background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.3);
  color: var(--danger); padding: 12px; border-radius: var(--radius-sm);
  font-size: 0.88rem; margin-bottom: 16px; display: none;
}
.form-error.visible { display: block; }
.form-section-title {
  font-size: 0.95rem; font-weight: 600; color: var(--accent);
  margin: 24px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--border);
}

/* ===== Landing Page ===== */
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(15,23,42,0.85); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.2rem; font-weight: 700; color: var(--text-primary); }
.logo-icon {
  width: 36px; height: 36px; background: linear-gradient(135deg, var(--accent), #06b6d4);
  border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center;
}
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a { color: var(--text-secondary); font-size: 0.93rem; font-weight: 500; }
.nav-links a:hover { color: var(--text-primary); }
.menu-toggle { display: none; background: none; border: none; color: var(--text-primary); font-size: 1.5rem; cursor: pointer; }

.hero { padding: 150px 0 90px; position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; top: -150px; right: -150px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}
.hero .container { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.hero-badge {
  display: inline-flex; padding: 6px 14px; background: rgba(59,130,246,0.12);
  border: 1px solid rgba(59,130,246,0.25); border-radius: 999px;
  font-size: 0.85rem; color: var(--accent-hover); margin-bottom: 20px;
}
.hero h1 { font-size: 2.8rem; font-weight: 800; line-height: 1.15; margin-bottom: 18px; }
.hero h1 span {
  background: linear-gradient(135deg, var(--accent), #06b6d4);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.hero p { font-size: 1.08rem; color: var(--text-secondary); margin-bottom: 32px; max-width: 480px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-visual .building-preview {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
}
.building-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.apt-unit {
  background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px; text-align: center;
}
.apt-unit.active { border-color: var(--accent); background: rgba(59,130,246,0.08); }
.apt-unit .no { font-size: 1.1rem; font-weight: 700; }
.apt-unit .status { font-size: 0.75rem; color: var(--text-muted); margin-top: 4px; }
.preview-summary {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 16px;
}
.preview-stat {
  background: var(--bg-primary); border-radius: var(--radius-sm); padding: 12px;
  border: 1px solid var(--border); text-align: center;
}
.preview-stat .val { font-size: 1.2rem; font-weight: 700; }
.preview-stat .lbl { font-size: 0.72rem; color: var(--text-muted); }

.features { padding: 90px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header h2 { font-size: 2rem; font-weight: 700; margin-bottom: 10px; }
.section-header p { color: var(--text-secondary); font-size: 1.05rem; }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; transition: all var(--transition);
}
.feature-card:hover { border-color: var(--accent); transform: translateY(-3px); }
.feature-icon { font-size: 1.6rem; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 0.9rem; }

.roles-section { padding: 60px 0 90px; }
.roles-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.role-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px;
}
.role-card h3 { font-size: 1.2rem; margin-bottom: 10px; }
.role-card p { color: var(--text-secondary); margin-bottom: 20px; font-size: 0.93rem; }
.role-card ul { list-style: none; margin-bottom: 24px; }
.role-card li { padding: 6px 0; color: var(--text-secondary); font-size: 0.9rem; }
.role-card li::before { content: "✓ "; color: var(--success); font-weight: 700; }

.footer { padding: 36px 0; border-top: 1px solid var(--border); }
.footer .container { display: flex; align-items: center; justify-content: space-between; }
.footer p { color: var(--text-muted); font-size: 0.88rem; }

/* ===== Login ===== */
.login-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px; position: relative;
}
.login-page::before {
  content: ""; position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 700px; height: 700px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 60%);
  pointer-events: none;
}
.login-wrapper { width: 100%; max-width: 420px; position: relative; z-index: 1; }
.login-header { text-align: center; margin-bottom: 28px; }
.login-header .logo { justify-content: center; margin-bottom: 20px; }
.login-header h1 { font-size: 1.6rem; font-weight: 700; margin-bottom: 6px; }
.login-header p { color: var(--text-secondary); font-size: 0.9rem; }
.login-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow);
}
.login-hint {
  margin-top: 20px; padding: 12px; background: rgba(59,130,246,0.08);
  border: 1px solid rgba(59,130,246,0.2); border-radius: var(--radius-sm);
  font-size: 0.82rem; color: var(--text-secondary);
}
.login-hint code { color: var(--accent-hover); }
.back-home { display: inline-flex; align-items: center; gap: 6px; margin-top: 20px; color: var(--text-muted); font-size: 0.88rem; }
.password-toggle { position: relative; }
.password-toggle input { padding-right: 60px; }
.toggle-btn {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  background: none; border: none; color: var(--text-muted); cursor: pointer; font-size: 0.82rem; font-family: inherit;
}

/* ===== Panel Layout ===== */
.panel-layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w); background: var(--bg-secondary);
  border-right: 1px solid var(--border); display: flex; flex-direction: column;
  position: fixed; top: 0; left: 0; bottom: 0; z-index: 50;
}
.sidebar-header { padding: 24px 20px; border-bottom: 1px solid var(--border); }
.sidebar-header .logo { font-size: 1.05rem; }
.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }
.sidebar-nav a {
  display: flex; align-items: center; gap: 10px; padding: 10px 14px;
  border-radius: var(--radius-sm); color: var(--text-secondary);
  font-size: 0.9rem; font-weight: 500; margin-bottom: 4px; transition: all var(--transition);
}
.sidebar-nav a:hover, .sidebar-nav a.active {
  background: rgba(59,130,246,0.12); color: var(--accent-hover);
}
.sidebar-footer { padding: 16px; border-top: 1px solid var(--border); }
.user-info { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 10px; }
.user-info strong { color: var(--text-primary); display: block; }

.panel-main { flex: 1; margin-left: var(--sidebar-w); padding: 32px; }
.panel-header { margin-bottom: 28px; }
.panel-header h1 { font-size: 1.6rem; font-weight: 700; }
.panel-header p { color: var(--text-secondary); font-size: 0.93rem; margin-top: 4px; }

/* ===== Cards & Tables ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-bottom: 28px; }
.stat-card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
}
.stat-card .label { font-size: 0.82rem; color: var(--text-muted); margin-bottom: 6px; }
.stat-card .value { font-size: 1.6rem; font-weight: 700; }
.stat-card .value.danger { color: var(--danger); }
.stat-card .value.success { color: var(--success); }

.card {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px; margin-bottom: 24px;
}
.card-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 18px; flex-wrap: wrap; gap: 12px;
}
.card-header h2 { font-size: 1.1rem; font-weight: 600; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
thead th {
  text-align: left; padding: 10px 14px; color: var(--text-muted);
  font-weight: 600; font-size: 0.8rem; text-transform: uppercase;
  letter-spacing: 0.03em; border-bottom: 1px solid var(--border);
}
tbody td { padding: 12px 14px; border-bottom: 1px solid var(--border); }
tbody tr:hover { background: rgba(59,130,246,0.04); }
.tutar-borc { color: var(--danger); font-weight: 600; }
.tutar-odeme { color: var(--success); font-weight: 600; }
.table-actions { display: flex; gap: 6px; }

.empty-state { text-align: center; padding: 40px; color: var(--text-muted); }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  display: none; align-items: center; justify-content: center;
  z-index: 200; padding: 24px;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--bg-secondary); border: 1px solid var(--border);
  border-radius: var(--radius); width: 100%; max-width: 640px;
  max-height: 90vh; overflow-y: auto; padding: 28px; box-shadow: var(--shadow);
}
.modal-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px;
}
.modal-header h2 { font-size: 1.15rem; font-weight: 600; }
.modal-close {
  background: none; border: none; color: var(--text-muted);
  font-size: 1.4rem; cursor: pointer; line-height: 1;
}
.modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 24px; right: 24px; padding: 14px 22px;
  border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 500;
  z-index: 300; transform: translateY(100px); opacity: 0;
  transition: all 0.3s ease;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-success { background: var(--success); color: #fff; }
.toast-error { background: var(--danger); color: #fff; }

/* ===== Tabs ===== */
.tabs { display: flex; gap: 4px; margin-bottom: 20px; border-bottom: 1px solid var(--border); }
.tab-btn {
  padding: 10px 18px; background: none; border: none; color: var(--text-muted);
  font-size: 0.88rem; font-weight: 500; cursor: pointer; font-family: inherit;
  border-bottom: 2px solid transparent; margin-bottom: -1px; transition: all var(--transition);
}
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); transition: transform 0.3s; }
  .sidebar.open { transform: translateX(0); }
  .panel-main { margin-left: 0; padding: 20px; }
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero h1 { font-size: 2rem; }
  .hero p { margin: 0 auto 28px; }
  .hero-actions { justify-content: center; }
  .hero-visual { display: none; }
  .features-grid, .roles-grid { grid-template-columns: 1fr; }
  .form-row-2, .form-row-3 { grid-template-columns: 1fr; }
  .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; background: var(--bg-secondary); flex-direction: column; padding: 20px; gap: 14px; border-bottom: 1px solid var(--border); }
  .nav-links.open { display: flex; }
  .menu-toggle { display: block; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}