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

:root {
  --accent:      #2563eb;
  --accent-dark: #1d4ed8;
  --accent-bg:   #dbeafe;
  --accent-text: #1e40af;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f1f5f9;
  color: #1e293b;
  min-height: 100vh;
}

/* ── App Shell ────────────────────────────────────────── */
#ders-app {
  min-height: 100vh;
}

#ders-app.da-loading #da-loading { display: flex; }
#ders-app.da-loading #da-view-auth,
#ders-app.da-loading #da-view-pending,
#ders-app.da-loading #da-view-forgot,
#ders-app.da-loading #da-view-reset,
#ders-app.da-loading #da-view-dashboard,
#ders-app.da-loading #da-view-course { display: none !important; }

.da-hidden { display: none !important; }

/* ── Spinner ──────────────────────────────────────────── */
.da-spinner-wrap {
  display: none;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}
.da-spinner {
  width: 44px;
  height: 44px;
  border: 4px solid #e2e8f0;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: da-spin .8s linear infinite;
}
@keyframes da-spin { to { transform: rotate(360deg); } }

/* ── Auth Page ────────────────────────────────────────── */
.da-auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: linear-gradient(135deg, #f1f5f9 0%, #e0ecff 100%);
}

.da-auth-box {
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(37,99,235,.12);
  padding: 32px 28px;
  width: 100%;
  max-width: 420px;
}

.da-auth-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.da-auth-logo-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: .5px;
}
.da-auth-logo-sub {
  font-size: .8rem;
  color: #64748b;
}

/* ── Auth Tabs ────────────────────────────────────────── */
.da-auth-tabs {
  display: flex;
  border-bottom: 2px solid #e2e8f0;
  margin-bottom: 20px;
}
.da-auth-tab {
  flex: 1;
  padding: 10px;
  border: none;
  background: transparent;
  color: #64748b;
  font-size: .9rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all .15s;
}
.da-auth-tab:hover { color: var(--accent); }
.da-auth-tab-active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ── Auth Links ───────────────────────────────────────── */
.da-auth-links {
  text-align: center;
  margin-top: 12px;
}
.da-link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: .85rem;
  cursor: pointer;
  padding: 0;
}
.da-link-btn:hover { text-decoration: underline; }

.da-kvkk-register-note {
  display: grid;
  gap: 6px;
  margin: 0 0 14px;
  text-align: center;
  font-size: .82rem;
}

.da-kvkk-register-note a {
  color: var(--accent);
  font-weight: 700;
  text-decoration: none;
}

.da-kvkk-register-note a:hover {
  text-decoration: underline;
}

.da-consent-box {
  display: grid;
  gap: 9px;
  margin: 0 0 14px;
}

.da-consent-check {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 9px;
  align-items: start;
  color: #475569;
  font-size: .8rem;
  line-height: 1.45;
}

.da-consent-check input {
  width: 16px;
  height: 16px;
  margin-top: 2px;
  accent-color: var(--accent);
}

.da-kvkk-page {
  min-height: 100vh;
  background: linear-gradient(135deg, #f1f5f9 0%, #e0ecff 100%);
}

.da-kvkk-wrap {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 34px 0;
}

.da-kvkk-card {
  background: #fff;
  border: 1px solid #dbeafe;
  border-radius: 20px;
  box-shadow: 0 12px 34px rgba(37,99,235,.12);
  padding: clamp(22px, 3.5vw, 36px);
}

.da-kvkk-back {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--accent);
  font-size: .8rem;
  font-weight: 700;
  text-decoration: none;
}

.da-kvkk-back:hover {
  text-decoration: underline;
}

.da-kvkk-eyebrow {
  color: var(--accent);
  font-size: .66rem;
  font-weight: 800;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.da-kvkk-card h1 {
  margin-top: 6px;
  color: #0f172a;
  font-size: clamp(1.04rem, 2.4vw, 1.48rem);
  line-height: 1.2;
}

.da-kvkk-card section {
  margin-top: 18px;
}

.da-kvkk-card h2 {
  color: #1e293b;
  font-size: .9rem;
  margin-bottom: 6px;
}

.da-kvkk-card p,
.da-kvkk-card li {
  color: #475569;
  font-size: .84rem;
  line-height: 1.62;
}

.da-kvkk-card ul {
  margin-top: 8px;
  padding-left: 22px;
}

.da-kvkk-card li + li {
  margin-top: 8px;
}

/* ── Pending View ─────────────────────────────────────── */
.da-text-center { text-align: center; }
.da-pending-icon { font-size: 3rem; margin-bottom: 16px; }
.da-pending-title { font-size: 1.2rem; font-weight: 700; color: #1e293b; margin-bottom: 10px; }
.da-pending-desc { font-size: .9rem; color: #475569; line-height: 1.6; }

/* ── Alerts ───────────────────────────────────────────── */
.da-alert {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: .85rem;
  margin-bottom: 14px;
  line-height: 1.5;
}
.da-alert-success {
  background: #ccfbf1;
  border: 1px solid #99f6e4;
  color: #134e4a;
}
.da-alert-error {
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #dc2626;
}
.da-alert-info {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
}

/* ── Forms ────────────────────────────────────────────── */
.da-form-row {
  display: flex;
  flex-direction: column;
  gap: 5px;
  margin-bottom: 14px;
}
.da-form-row label {
  font-size: .82rem;
  font-weight: 600;
  color: #374151;
}
.da-form-row input,
.da-form-row textarea,
.da-form-row select {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: .9rem;
  color: #1e293b;
  outline: none;
  transition: border .15s;
  font-family: inherit;
  background: #fff;
}
.da-form-row input:focus,
.da-form-row textarea:focus,
.da-form-row select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}
.da-form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.da-hint {
  font-size: .78rem;
  color: #94a3b8;
}

/* ── Buttons ──────────────────────────────────────────── */
.da-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: .875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .15s;
  white-space: nowrap;
  font-family: inherit;
}
.da-btn-sm { padding: 6px 14px; font-size: .82rem; }
.da-btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.da-btn-primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.da-btn-ghost { background: #fff; border-color: #d1d5db; color: #475569; }
.da-btn-ghost:hover { border-color: #94a3b8; background: #f8fafc; }
.da-btn-danger { background: #dc2626; color: #fff; border-color: #dc2626; }
.da-btn-danger:hover { background: #b91c1c; border-color: #b91c1c; }
.da-btn-block { width: 100%; }
.da-btn:disabled { opacity: .5; cursor: not-allowed; }

/* ── Top Bar ──────────────────────────────────────────── */
.da-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  padding: 0 20px;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 12px;
}
.da-topbar-left { display: flex; align-items: center; gap: 10px; }
.da-topbar-right { display: flex; align-items: center; gap: 10px; }
.da-topbar-brand {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: .5px;
}
.da-topbar-sub { font-size: .8rem; color: #94a3b8; }
.da-topbar-user { font-size: .82rem; color: #64748b; }

/* ── Content ──────────────────────────────────────────── */
.da-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.da-section-head {
  margin-bottom: 16px;
}
.da-section-head h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1e293b;
}
.da-section-head h3 {
  font-size: 1rem;
  font-weight: 600;
  color: #374151;
}

.da-account-danger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 22px;
  padding: 16px;
  border: 1px solid #fecaca;
  border-radius: 14px;
  background: #fff7f7;
}

.da-account-danger strong {
  display: block;
  color: #7f1d1d;
  font-size: .92rem;
}

.da-account-danger p {
  margin-top: 4px;
  color: #991b1b;
  font-size: .8rem;
  line-height: 1.5;
}

/* ── Courses Grid ─────────────────────────────────────── */
.da-courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.da-course-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 18px;
  cursor: pointer;
  transition: all .15s;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.da-course-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 16px rgba(13,148,136,.12);
  transform: translateY(-1px);
}
.da-course-card-code {
  font-size: .72rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .5px;
  text-transform: uppercase;
}
.da-course-card-name {
  font-size: 1rem;
  font-weight: 700;
  color: #1e293b;
  line-height: 1.3;
}
.da-course-card-meta {
  font-size: .78rem;
  color: #94a3b8;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.da-course-card-footer {
  margin-top: 6px;
  padding-top: 10px;
  border-top: 1px solid #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.da-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 10px;
  font-size: .72rem;
  font-weight: 600;
  background: var(--accent-bg);
  color: var(--accent-text);
}
.da-badge-arrow {
  font-size: .8rem;
  color: var(--accent);
}

/* ── Course Header ────────────────────────────────────── */
.da-course-header {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 18px 20px;
  margin-bottom: 20px;
}
.da-course-header-code {
  font-size: .72rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.da-course-header-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 8px;
}
.da-course-header-meta {
  font-size: .82rem;
  color: #64748b;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* ── Notes List ───────────────────────────────────────── */
.da-notes-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.da-note-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 14px;
  transition: border-color .15s;
}
.da-note-card:hover { border-color: #94a3b8; }
.da-note-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--accent-bg);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.da-note-info { flex: 1; min-width: 0; }
.da-note-title {
  font-size: .92rem;
  font-weight: 600;
  color: #1e293b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.da-note-meta { font-size: .75rem; color: #94a3b8; margin-top: 2px; }

/* ── Empty State ──────────────────────────────────────── */
.da-empty {
  text-align: center;
  padding: 48px 20px;
  color: #94a3b8;
  font-size: .9rem;
  background: #fff;
  border: 1px dashed #e2e8f0;
  border-radius: 12px;
}
.da-empty-icon { font-size: 2.5rem; margin-bottom: 10px; }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 640px) {
  .da-auth-box { padding: 24px 18px; }
  .da-content { padding: 16px 14px 60px; }
  .da-topbar { padding: 0 14px; }
  .da-topbar-sub { display: none; }
  .da-account-danger {
    align-items: stretch;
    flex-direction: column;
  }
  .da-courses-grid { grid-template-columns: 1fr; }
  .da-form-row-2 { grid-template-columns: 1fr; }
  .da-course-header-meta { gap: 10px; }
}