/**
 * Derin Eğitim — kurumsal tema (gradient yok)
 */
:root {
  --derin-navy: #0f2744;
  --derin-navy-2: #1a3a5c;
  --derin-accent: #c41e3a;
  --derin-text: #1a1a1a;
  --derin-muted: #5c6b7a;
  --derin-border: #e2e8f0;
  --derin-bg: #f6f8fb;
  --derin-white: #ffffff;
  --derin-success: #0d6e3f;
  --derin-focus: #2563eb;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--derin-text);
  background-color: var(--derin-bg);
  line-height: 1.55;
}

.derin-topbar {
  background-color: var(--derin-white);
  border-bottom: 1px solid var(--derin-border);
  box-shadow: 0 1px 0 rgba(15, 39, 68, 0.06);
}

.derin-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
  text-decoration: none;
  color: var(--derin-navy);
}

.derin-brand img {
  height: 52px;
  width: auto;
  object-fit: contain;
}

.derin-brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
}

.derin-brand-text span {
  font-size: 0.8rem;
  color: var(--derin-muted);
}

.derin-hero {
  background-color: var(--derin-white);
  border: 1px solid var(--derin-border);
  border-radius: 0.5rem;
}

.derin-section-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--derin-navy);
  border-bottom: 2px solid var(--derin-navy);
  padding-bottom: 0.35rem;
  margin-bottom: 1.25rem;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--derin-focus);
  box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.15);
}

.btn-derin-primary {
  background-color: var(--derin-navy);
  border-color: var(--derin-navy);
  color: #fff;
}

.btn-derin-primary:hover {
  background-color: var(--derin-navy-2);
  border-color: var(--derin-navy-2);
  color: #fff;
}

.btn-derin-accent {
  background-color: var(--derin-accent);
  border-color: var(--derin-accent);
  color: #fff;
}

.btn-derin-accent:hover {
  background-color: #a01830;
  border-color: #a01830;
  color: #fff;
}

.derin-footer {
  background-color: var(--derin-white);
  border-top: 1px solid var(--derin-border);
  color: var(--derin-muted);
  font-size: 0.875rem;
}

.admin-sidebar {
  min-height: 100vh;
  background-color: var(--derin-navy);
  color: #e8eef5;
}

.admin-sidebar .nav-link {
  color: rgba(255, 255, 255, 0.85);
  border-radius: 0.375rem;
  padding: 0.5rem 0.75rem;
}

.admin-sidebar .nav-link:hover,
.admin-sidebar .nav-link.active {
  background-color: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.admin-content {
  background-color: var(--derin-bg);
  min-height: 100vh;
}

.stat-card {
  background: var(--derin-white);
  border: 1px solid var(--derin-border);
  border-radius: 0.5rem;
  padding: 1.25rem;
}

.stat-card h3 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--derin-navy);
  margin: 0;
}

.stat-card p {
  margin: 0;
  color: var(--derin-muted);
  font-size: 0.875rem;
}

.table-card {
  background: var(--derin-white);
  border: 1px solid var(--derin-border);
  border-radius: 0.5rem;
}

.derin-form-wrap .col-lg-9 {
  background: var(--derin-white);
  border: 1px solid var(--derin-border);
  border-radius: 0.75rem;
  padding: 1.25rem;
  box-shadow: 0 8px 24px rgba(15, 39, 68, 0.04);
}

.derin-form-head {
  border-bottom: 1px solid var(--derin-border);
  padding-bottom: 0.9rem;
  margin-bottom: 1rem;
}

.derin-form-section {
  border: 1px solid #edf2f7;
  border-radius: 0.65rem;
  padding: 1rem;
  background: #fcfdff;
}

.derin-form-section .form-label {
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.derin-seans-card {
  border-color: #d9e2ef !important;
  background: #fff;
}

.derin-seans-card .form-check-input {
  margin-top: 0.2rem;
}

.derin-seans-card .form-check-label {
  width: 100%;
}

.derin-submit-row {
  border-top: 1px solid var(--derin-border);
  padding-top: 1rem;
}

@media (max-width: 767.98px) {
  .derin-form-wrap .col-lg-9 {
    padding: 1rem;
    border-radius: 0.6rem;
  }
  .derin-form-section {
    padding: 0.85rem;
  }
}

.invalid-feedback.d-block {
  font-size: 0.875rem;
}

/* Honeypot: görünmez */
.hp-field {
  position: absolute !important;
  left: -9999px !important;
  height: 0 !important;
  overflow: hidden !important;
  opacity: 0 !important;
}