/* Kongre hata sayfalari — Summit (navy + blue) */
:root {
  --error-brand: #0f172a;
  --error-brand-mid: #1e3a8a;
  --error-accent: #1d4ed8;
  --error-accent-deep: #1e40af;
  --error-accent-soft: #93c5fd;
  --error-accent-wash: #eff6ff;
  --error-teal: #1d4ed8;
  --error-teal-light: #bfdbfe;
  --error-navy: #070f1f;
  --error-text: #334155;
  --error-muted: #64748b;
  --error-border: #e2e8f0;
  --error-surface: #f8fafc;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body.error-page-body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: "DM Sans", "Source Sans 3", system-ui, sans-serif;
  color: var(--error-text);
  background: var(--error-surface);
}

body.error-page-body > main,
body.error-page-body > .error-stage {
  flex: 1;
}

.error-topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: linear-gradient(135deg, #070f1f 0%, #0f172a 45%, #1e3a8a 100%);
  box-shadow: 0 4px 20px rgb(15 23 42 / 0.22);
  border-bottom: 2px solid rgb(59 130 246 / 0.55);
}

.error-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
}

.error-topbar__logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  max-width: min(70vw, 28rem);
}

.error-topbar__logo img {
  max-height: 2.75rem;
  max-width: min(38vw, 220px);
  width: auto;
  object-fit: contain;
}

.error-topbar__logo span {
  font-family: "Playfair Display", "Source Serif 4", Georgia, serif;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.35;
  color: #93c5fd;
}

.error-topbar__home {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.95rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  background: rgb(255 255 255 / 0.08);
  border: 1px solid rgb(147 197 253 / 0.35);
  border-radius: 0.55rem;
  transition: background 0.15s, border-color 0.15s;
}

.error-topbar__home:hover {
  background: rgb(59 130 246 / 0.22);
  border-color: #93c5fd;
}

.error-stage {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 2rem 1.25rem 3rem;
}

.error-stage__hero {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.error-stage__mesh {
  position: absolute;
  inset: -20% -10%;
  background:
    radial-gradient(ellipse 50% 40% at 20% 20%, rgb(59 130 246 / 0.16), transparent 60%),
    radial-gradient(ellipse 45% 35% at 80% 10%, rgb(30 58 138 / 0.12), transparent 55%),
    linear-gradient(180deg, #f1f5f9 0%, #f8fafc 100%);
  opacity: 1;
}

.error-stage__container {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 56rem;
  margin: 0 auto;
}

.error-panel {
  display: grid;
  overflow: hidden;
  background: #fff;
  border: 1px solid #bfdbfe;
  border-radius: 1.25rem;
  box-shadow: 0 18px 48px rgb(15 23 42 / 0.1);
}

@media (min-width: 768px) {
  .error-panel {
    grid-template-columns: minmax(11rem, 15rem) 1fr;
  }
}

.error-panel__visual {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
  padding: 1.75rem 1.5rem;
  color: #fff;
  background: linear-gradient(160deg, #070f1f 0%, #0f172a 35%, #1e3a8a 75%, #1d4ed8 120%);
}

.error-panel__code-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.error-panel__badge {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #93c5fd;
}

.error-panel__code {
  font-family: "Playfair Display", "Source Serif 4", Georgia, serif;
  font-size: clamp(3rem, 8vw, 4.5rem);
  font-weight: 700;
  line-height: 1;
  color: #fff;
}

.error-panel__congress {
  margin: 0;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: rgb(255 255 255 / 0.82);
}

.error-panel__content {
  padding: 1.75rem 1.5rem 1.85rem;
}

@media (min-width: 768px) {
  .error-panel__content {
    padding: 2rem 2rem 2.1rem;
  }
}

.error-panel__crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
  font-size: 0.8125rem;
  color: var(--error-muted);
}

.error-panel__crumb a {
  color: var(--error-brand);
  font-weight: 600;
  text-decoration: none;
}

.error-panel__crumb a:hover {
  color: var(--error-accent);
}

.error-panel__title {
  margin: 0 0 0.65rem;
  font-family: "Playfair Display", "Source Serif 4", Georgia, serif;
  font-size: clamp(1.45rem, 3vw, 1.85rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--error-brand);
}

.error-panel__lead {
  margin: 0 0 1.25rem;
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--error-muted);
}

.error-panel__path {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  padding: 0.85rem 1rem;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 0.75rem;
}

.error-panel__path-label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--error-brand);
}

.error-panel__path code {
  font-size: 0.8125rem;
  word-break: break-all;
  color: #475569;
}

.error-panel__nav-title {
  margin: 0 0 0.75rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--error-accent);
}

.error-panel__links {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 560px) {
  .error-panel__links {
    grid-template-columns: 1fr 1fr;
  }
}

.error-panel__link {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.7rem 0.85rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--error-brand);
  text-decoration: none;
  background: #fff;
  border: 1px solid var(--error-border);
  border-radius: 0.65rem;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.error-panel__link:hover {
  border-color: #93c5fd;
  background: #eff6ff;
  box-shadow: 0 4px 14px rgb(37 99 235 / 0.12);
}

.error-panel__link--primary {
  color: #fff;
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 55%, #1d4ed8 140%);
  border-color: transparent;
}

.error-panel__link--primary:hover {
  background: linear-gradient(135deg, #070f1f 0%, #1d4ed8 140%);
  box-shadow: 0 6px 18px rgb(37 99 235 / 0.28);
}

.error-panel__link-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  font-size: 0.8rem;
  color: var(--error-accent);
  background: #eff6ff;
  border-radius: 0.45rem;
}

.error-panel__link--primary .error-panel__link-icon {
  color: #1e3a8a;
  background: rgb(255 255 255 / 0.92);
}

.error-panel__link-text {
  flex: 1;
}

.error-panel__link-arrow {
  font-size: 0.7rem;
  opacity: 0.45;
}

.error-foot {
  margin-top: auto;
  padding: 1.1rem 1.25rem;
  background: #0f172a;
  border-top: 2px solid rgb(59 130 246 / 0.55);
}

.error-foot__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  max-width: 72rem;
  margin: 0 auto;
}

.error-foot p {
  margin: 0;
  font-size: 0.8125rem;
  color: rgb(255 255 255 / 0.72);
}

.error-foot a {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #93c5fd;
  text-decoration: none;
}

.error-foot a:hover {
  color: #fff;
}

/* Cikis onay sayfasi (auth/logout) — eski siniflar */
.error-card__logout-form {
  margin-top: 1rem;
}

.error-card__main {
  max-width: 28rem;
  margin: 4rem auto;
  padding: 2rem;
  background: #fff;
  border: 1px solid var(--error-border);
  border-radius: 1.25rem;
  box-shadow: 0 20px 48px rgb(15 23 42 / 0.08);
  text-align: center;
}

.error-card__code--small {
  font-size: 2.5rem;
  color: var(--error-accent);
  margin-bottom: 0.75rem;
}

.error-card__title {
  margin: 0 0 0.5rem;
  font-family: "Playfair Display", Georgia, serif;
  font-size: 1.35rem;
  color: var(--error-navy);
}

.error-card__lead {
  margin: 0 0 1.25rem;
  color: var(--error-muted);
  line-height: 1.55;
}

.error-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.error-card__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.65rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.15s;
}

.error-card__btn--primary {
  color: #fff;
  background: var(--error-accent);
  border-color: var(--error-accent);
}

.error-card__btn--ghost {
  color: var(--error-accent);
  background: #fff;
  border-color: var(--error-border);
}

.error-card__logout-form {
  display: contents;
}

@media (max-width: 767px) {
  .error-stage__container {
    padding-top: 3.5rem;
  }

  .error-panel__visual {
    padding: 1.5rem 1.25rem;
  }

  .error-panel__content {
    padding: 1.5rem 1.25rem;
  }

  .error-panel__links {
    grid-template-columns: 1fr;
  }
}

/* 403 — salt okunur / arsiv kongre */
.error-stage__hero--amber {
  background: linear-gradient(135deg, #78350f 0%, #b45309 45%, #d97706 100%);
}

.error-panel__badge--amber {
  background: rgb(251 191 36 / 0.2);
  color: #fde68a;
}

.error-panel__notice {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  padding: 0.85rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  line-height: 1.55;
  color: #92400e;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: 10px;
}

.error-panel__notice i {
  margin-top: 0.15rem;
  color: #d97706;
}

.error-panel__switch-form {
  margin-bottom: 1.25rem;
}

.error-panel__switch-btn {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.85rem 1.1rem;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  text-align: left;
  color: #fff;
  cursor: pointer;
  background: linear-gradient(135deg, #1e3a8a 0%, #1d4ed8 100%);
  border: none;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgb(37 99 235 / 0.35);
  transition: transform 0.15s, box-shadow 0.15s;
}

.error-panel__switch-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px rgb(37 99 235 / 0.4);
}

.error-panel__link-text small {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--error-muted);
}

/* 500 — gecici sunucu hatasi */
.error-stage__hero--soft {
  background: linear-gradient(135deg, #1e293b 0%, #334155 42%, #475569 100%);
}

.error-panel__badge--soft {
  background: rgb(148 163 184 / 0.22);
  color: #e2e8f0;
}

.error-panel__notice--soft {
  color: #334155;
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.error-panel__notice--soft i {
  color: #64748b;
}