:root {
  /* Kurumsal Renk Paleti */
  --primary: #1e3a8a;       /* Koyu kurumsal lacivert */
  --primary-hover: #1e40af; /* Buton hover rengi */
  --bg: #f8fafc;            /* Açık gri/buz beyazı arka plan */
  --card-bg: #ffffff;       /* Kart arka planı */
  --text-main: #1e293b;     /* Koyu antrasit metin rengi */
  --text-muted: #64748b;    /* İkincil soluk metin */
  --line: #e2e8f0;          /* İnce gri kenarlık rengi */
  --radius: 6px;            /* Daha keskin, kurumsal köşeler */
}

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

body {
  font: 14px/1.6 system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text-main);
}

/* Navigasyon / Üst Menü */
nav {
  background: var(--primary);
  color: #fff;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 20px;
  align-items: center;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

nav b {
  margin-right: 16px;
  font-size: 16px;
  letter-spacing: 0.5px;
}

nav a {
  color: #f1f5f9;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: var(--radius);
  transition: background 0.2s ease;
  font-weight: 500;
}

nav a:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

nav .r {
  margin-left: auto;
}

/* Ana İçerik Alanı */
main {
  max-width: 1140px;
  margin: 24px auto;
  padding: 0 16px;
}

h1 {
  color: var(--primary);
  font-size: 24px;
  margin-bottom: 16px;
  font-weight: 600;
}

/* Kart Yapısı (İçerik Kutuları) */
.card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  overflow-x: auto; /* Tabloların taşmasını engeller */
}

/* Formlar ve Izgara Yapısı */
.row {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-end;
  margin-bottom: 16px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  flex: 1;
  min-width: 200px;
}

input, select, textarea {
  padding: 10px 12px;
  border: 1px solid #cbd5e1;
  border-radius: var(--radius);
  font: inherit;
  color: var(--text-main);
  background: #fff;
  transition: border-color 0.2s;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

button {
  background: var(--primary);
  color: #fff;
  border: 1px solid var(--primary);
  padding: 10px 20px;
  border-radius: var(--radius);
  cursor: pointer;
  font: inherit;
  font-weight: 500;
  transition: all 0.2s;
}

button:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

/* Tablolar */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 8px;
}

th, td {
  text-align: left;
  padding: 12px;
  border-bottom: 1px solid var(--line);
}

th {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  background: #f8fafc;
}

.sum td {
  font-weight: 700;
  background: #f1f5f9;
}

/* İstatistik Izgarası */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.stat b {
  display: block;
  font-size: 28px;
  color: var(--primary);
  margin-top: 4px;
}

/* Bildirimler ve Durumlar */
.err {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #f87171;
  padding: 12px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}

.ok {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #86efac;
  padding: 12px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}

/* Yardımcı Sınıflar (Utility) */
.inline { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.inline input, .inline select, .inline button { padding: 6px 10px; }
.chk { flex-direction: row; align-items: center; gap: 8px; font-weight: normal; color: var(--text-main); }
.chk input { width: auto; cursor: pointer; }
.kargo { display: none; }
.del { background: #64748b; border-color: #64748b; }
.del:hover { background: #475569; border-color: #475569; }

/* Login Ekranı Ortalaması */
.login {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--bg);
}

.login .card {
  width: 100%;
  max-width: 360px;
  padding: 32px 24px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* 📱 MOBİL UYUMLULUK (Responsive Tasarım) */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px;
  }
  
  nav .r {
    margin-left: 0;
    margin-top: 8px;
    width: 100%;
  }

  nav a {
    display: inline-block;
    margin-bottom: 4px;
  }
  
  .row {
    flex-direction: column;
    align-items: stretch;
  }
  
  label {
    min-width: 100%;
  }
  
  .card {
    padding: 16px;
  }
  
  button {
    width: 100%; /* Mobilde butonlar tam genişlikte daha kolay tıklanır */
  }
  
  .inline button {
    width: auto;
  }
}

/* Yazdırma (Print) Ayarları */
@media print {
  .no-print { display: none !important; }
  body { background: #fff; color: #000; }
  .card { border: none; box-shadow: none; padding: 0; margin: 0; }
  nav { display: none; }
}