:root {
  --coke-red: #e3001b;
  --coke-red-dark: #b50016;
  --dark: #1a1a1a;
  --gray: #6b7280;
  --light: #f4f5f7;
  --border: #e2e4e8;
  --green: #16a34a;
  --yellow: #f59e0b;
  --red: #dc2626;
  --black-skt: #111827;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Segoe UI', system-ui, -apple-system, Roboto, sans-serif;
  background: var(--light);
  color: var(--dark);
  font-size: 15px;
}
.hidden { display: none !important; }

/* --- GIRIS --- */
.login-screen {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--coke-red), var(--coke-red-dark));
}
.login-box {
  background: #fff; padding: 40px; border-radius: 16px; width: 360px;
  box-shadow: 0 20px 60px rgba(0,0,0,.3); text-align: center;
}
.login-logo { font-size: 56px; }
.login-box h1 { font-size: 24px; margin: 8px 0 2px; }
.login-sub { color: var(--gray); margin-bottom: 24px; font-size: 14px; }
.login-box input {
  width: 100%; padding: 12px 14px; margin-bottom: 12px; border: 1px solid var(--border);
  border-radius: 8px; font-size: 15px;
}
.login-box button {
  width: 100%; padding: 12px; background: var(--coke-red); color: #fff; border: none;
  border-radius: 8px; font-size: 16px; font-weight: 600; cursor: pointer;
}
.login-box button:hover { background: var(--coke-red-dark); }
.error-msg { color: var(--red); margin-top: 12px; font-size: 14px; min-height: 18px; }

/* --- TOPBAR --- */
.topbar {
  background: var(--coke-red); color: #fff; display: flex; align-items: center;
  padding: 0 20px; gap: 20px; box-shadow: 0 2px 8px rgba(0,0,0,.15); flex-wrap: wrap;
}
.brand { font-size: 18px; font-weight: 700; padding: 14px 0; white-space: nowrap; }
.tabs { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.tab {
  background: transparent; color: #fff; border: none; padding: 10px 14px; cursor: pointer;
  font-size: 14px; border-radius: 8px; opacity: .85; white-space: nowrap;
}
.tab:hover { opacity: 1; background: rgba(255,255,255,.12); }
.tab.active { background: #fff; color: var(--coke-red); font-weight: 600; opacity: 1; }
.user-menu { display: flex; align-items: center; gap: 12px; font-size: 13px; }
.link-btn { background: rgba(255,255,255,.15); color: #fff; border: none; padding: 6px 10px;
  border-radius: 6px; cursor: pointer; font-size: 13px; }
.link-btn:hover { background: rgba(255,255,255,.3); }

main { padding: 24px; max-width: 1200px; margin: 0 auto; }

/* --- KARTLAR --- */
h2.view-title { font-size: 22px; margin-bottom: 18px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.card {
  background: #fff; border-radius: 12px; padding: 18px; box-shadow: 0 1px 4px rgba(0,0,0,.06);
  border-left: 5px solid var(--gray);
}
.card .num { font-size: 30px; font-weight: 700; }
.card .lbl { color: var(--gray); font-size: 13px; margin-top: 4px; }
.card.green { border-left-color: var(--green); }
.card.yellow { border-left-color: var(--yellow); }
.card.red { border-left-color: var(--red); }
.card.expired { border-left-color: var(--black-skt); }
.card.info { border-left-color: var(--coke-red); }

/* --- PANELLER / FORMLAR --- */
.panel {
  background: #fff; border-radius: 12px; padding: 22px; box-shadow: 0 1px 4px rgba(0,0,0,.06);
  margin-bottom: 20px;
}
.panel h3 { margin-bottom: 16px; font-size: 17px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.field { flex: 1; min-width: 160px; display: flex; flex-direction: column; gap: 4px; }
.field label { font-size: 13px; color: var(--gray); font-weight: 600; }
.field input, .field select {
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 15px;
}
.field input:focus, .field select:focus { outline: 2px solid var(--coke-red); border-color: transparent; }
.btn {
  background: var(--coke-red); color: #fff; border: none; padding: 11px 20px; border-radius: 8px;
  font-size: 15px; font-weight: 600; cursor: pointer;
}
.btn:hover { background: var(--coke-red-dark); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn:disabled:hover { background: var(--coke-red); }
.btn.secondary { background: #fff; color: var(--dark); border: 1px solid var(--border); }
.btn.secondary:hover { background: var(--light); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.btn.danger { background: var(--red); }

.barcode-box {
  background: #fff8e1; border: 2px dashed var(--yellow); border-radius: 10px; padding: 16px;
  margin-bottom: 18px;
}
.barcode-box label { font-weight: 700; display: block; margin-bottom: 6px; }
.barcode-box input { width: 100%; padding: 14px; font-size: 18px; border: 1px solid var(--border); border-radius: 8px; }
.found-product { margin-top: 12px; padding: 12px; background: #e8f5e9; border-radius: 8px; font-size: 15px; }

/* --- TABLO --- */
table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden;
  box-shadow: 0 1px 4px rgba(0,0,0,.06); }
th, td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
th { background: var(--light); font-weight: 600; color: var(--gray); font-size: 13px; text-transform: uppercase; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #fafafa; }

.badge { display: inline-block; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 700; color: #fff; }
.badge.green { background: var(--green); }
.badge.yellow { background: var(--yellow); }
.badge.red { background: var(--red); }
.badge.expired { background: var(--black-skt); }
.badge.in { background: var(--green); }
.badge.out { background: var(--coke-red); }
.badge.adjust { background: var(--gray); }

.muted { color: var(--gray); }
.empty { text-align: center; padding: 40px; color: var(--gray); }
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; align-items: flex-end; }

/* --- TOAST --- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--dark); color: #fff; padding: 14px 24px; border-radius: 10px;
  box-shadow: 0 8px 30px rgba(0,0,0,.3); z-index: 1000; font-size: 15px;
}
.toast.success { background: var(--green); }
.toast.error { background: var(--red); }

/* --- MODAL --- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.5); display: flex;
  align-items: center; justify-content: center; z-index: 900;
}
.modal { background: #fff; border-radius: 14px; padding: 26px; width: 440px; max-width: 92vw;
  max-height: 90vh; overflow-y: auto; }
.modal h3 { margin-bottom: 18px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }

@media (max-width: 640px) {
  .topbar { flex-direction: column; align-items: stretch; padding: 10px; }
  main { padding: 14px; }
}