:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #1c2430;
  --muted: #5d6b7a;
  --border: #d9e0e7;
  --primary: #0b5cad;
  --primary-text: #ffffff;
  --primary-hover: #094a8b;
  --ok: #17803d;
  --ok-bg: #e8f6ee;
  --warn: #9a5b00;
  --warn-bg: #fff4e0;
  --danger: #b42318;
  --danger-bg: #fdecea;
  --info-bg: #eaf2fb;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11161c;
    --surface: #1a2129;
    --text: #e6ebf0;
    --muted: #9aa8b6;
    --border: #2e3843;
    --primary: #4c9be8;
    --primary-text: #0b1520;
    --primary-hover: #74b2ef;
    --ok: #4cc37a;
    --ok-bg: #12301f;
    --warn: #f0b04a;
    --warn-bg: #3a2a0d;
    --danger: #f2756a;
    --danger-bg: #3d1714;
    --info-bg: #15283c;
    --shadow: none;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

a {
  color: var(--primary);
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.site-header .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  max-width: 960px;
  margin: 0 auto;
  padding: 12px 16px;
}

.brand {
  font-weight: 650;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}

.brand small {
  display: block;
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--muted);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

main.narrow {
  max-width: 480px;
}

h1 {
  font-size: 1.5rem;
  line-height: 1.25;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.15rem;
  margin: 0 0 12px;
}

h3 {
  font-size: 1rem;
  margin: 0 0 8px;
}

p {
  margin: 0 0 12px;
}

.muted {
  color: var(--muted);
}

.small {
  font-size: 0.875rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 16px;
}

.stack > * + * {
  margin-top: 12px;
}

label {
  display: block;
  font-weight: 550;
  margin-bottom: 4px;
}

input[type='text'],
input[type='email'],
input[type='password'],
input[type='datetime-local'],
input[type='search'],
select,
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus,
button:focus-visible,
a:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--primary) 45%, transparent);
  outline-offset: 1px;
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 4px;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--primary);
  color: var(--primary-text);
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

button:hover,
.button:hover {
  background: var(--primary-hover);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* Öğrenci panelinde bir dosya işlemi sürerken dönem bağlantıları da kilitlenir. */
.panel-busy .period-card,
.panel-busy .breadcrumb a {
  pointer-events: none;
  opacity: 0.55;
}

button.secondary,
.button.secondary {
  background: transparent;
  color: var(--primary);
  border-color: var(--border);
}

button.secondary:hover,
.button.secondary:hover {
  background: var(--info-bg);
}

button.danger {
  background: var(--danger);
  color: #fff;
}

button.link {
  background: none;
  border: none;
  color: var(--primary);
  padding: 0;
  min-height: 0;
  font-weight: 500;
  text-decoration: underline;
}

button.block {
  width: 100%;
}

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
  overflow-x: auto;
}

.tabs button {
  background: none;
  color: var(--muted);
  border: none;
  border-bottom: 3px solid transparent;
  border-radius: 0;
  padding: 10px 12px;
  white-space: nowrap;
}

.tabs button[aria-selected='true'] {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.notice {
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 12px;
  background: var(--info-bg);
}

.notice.error {
  background: var(--danger-bg);
  color: var(--danger);
}

.notice.success {
  background: var(--ok-bg);
  color: var(--ok);
}

.notice.warn {
  background: var(--warn-bg);
  color: var(--warn);
}

.key-box {
  font: 600 1.6rem/1.2 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 0.08em;
  text-align: center;
  padding: 18px 12px;
  border: 2px dashed var(--primary);
  border-radius: var(--radius);
  background: var(--info-bg);
  user-select: all;
  word-break: break-all;
}

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--info-bg);
  color: var(--text);
  white-space: nowrap;
}

.badge.ok {
  background: var(--ok-bg);
  color: var(--ok);
}

.badge.warn {
  background: var(--warn-bg);
  color: var(--warn);
}

.badge.danger {
  background: var(--danger-bg);
  color: var(--danger);
}

.doc {
  border-top: 1px solid var(--border);
  padding-top: 14px;
  margin-top: 14px;
}

.doc-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  flex-wrap: wrap;
}

.progress {
  height: 10px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
  margin: 10px 0 4px;
}

.progress > div {
  height: 100%;
  width: 0;
  background: var(--primary);
  transition: width 0.2s;
}

.row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.row > * {
  flex: 1 1 180px;
}

.row > .shrink {
  flex: 0 0 auto;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.stat .value {
  font-size: 1.6rem;
  font-weight: 700;
}

.stat .label {
  color: var(--muted);
  font-size: 0.85rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.92rem;
}

th,
td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

th {
  font-weight: 600;
  color: var(--muted);
  background: var(--bg);
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: none;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.check {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
}

.check input {
  width: 20px;
  height: 20px;
  margin: 0;
  flex: 0 0 auto;
}

.cf-turnstile {
  min-height: 65px;
}

.site-footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px 32px;
  font-size: 0.85rem;
  color: var(--muted);
}

[hidden] {
  display: none !important;
}

@media (max-width: 560px) {
  .card {
    padding: 16px;
  }

  h1 {
    font-size: 1.3rem;
  }

  .key-box {
    font-size: 1.25rem;
  }
}

main.wide {
  max-width: 1200px;
}

.admin-nav {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.admin-nav a {
  font-weight: 600;
  text-decoration: none;
}

button.stat {
  display: block;
  text-align: left;
  color: var(--text);
  font-weight: 400;
  min-height: 0;
}

button.stat:hover {
  background: var(--info-bg);
}

.filters {
  margin-bottom: 12px;
}

.badge + .badge {
  margin-left: 4px;
}

details > summary {
  cursor: pointer;
  font-weight: 600;
}

details[open] > summary {
  margin-bottom: 12px;
}

.nowrap {
  white-space: nowrap;
}

.key-inline {
  font: 600 1.1rem ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 0.06em;
}

pre.meta {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.8rem;
  color: var(--muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 14px;
}

.site-nav a {
  font-weight: 600;
  text-decoration: none;
}

.site-nav a .badge {
  margin-left: 6px;
}

/* Okunmamış mesaj sayacı (öğrenci menüsü) */
.nav-count {
  display: inline-block;
  min-width: 1.45em;
  margin-left: 6px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--danger);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1.45em;
  text-align: center;
  vertical-align: 1px;
}

.site-nav a.has-unread {
  color: var(--danger);
}

.notice.info-strong {
  border-left: 4px solid var(--primary);
}

.notice p {
  margin: 0 0 6px;
}

.announcement {
  border-top: 1px solid var(--border);
  padding-top: 12px;
}

.announcement:first-child {
  border-top: none;
  padding-top: 0;
}

.announcement p {
  margin: 0 0 4px;
  white-space: pre-line;
}

details.danger-zone {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 10px 14px;
}

details.danger-zone > summary {
  color: var(--muted);
  font-weight: 500;
  font-size: 0.9rem;
}

.enrollment-remove {
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 14px;
}

.enrollment-remove p {
  margin-bottom: 4px;
}

/* Yoğunluk sırası (öğrenci paneli) */

.queue-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
}

.queue-box {
  width: 100%;
  max-width: 440px;
  padding: 24px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 30px rgba(16, 24, 40, 0.18);
}

.queue-eta {
  font-size: 1.15rem;
}

.spinner {
  width: 36px;
  height: 36px;
  margin: 0 auto;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation-duration: 3s;
  }
}

/* Ayarlar menüsü ve alt sayfaları */

.breadcrumb {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.breadcrumb a {
  font-weight: 600;
  text-decoration: none;
}

.menu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}

.menu-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  height: 100%;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  text-decoration: none;
}

.menu-card:hover {
  border-color: var(--primary);
  background: var(--info-bg);
}

.menu-card strong {
  color: var(--primary);
  font-size: 1.05rem;
}

.menu-card strong::after {
  content: ' ›';
}

.menu-card span {
  color: var(--muted);
  font-size: 0.875rem;
}

.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

label.inline {
  display: inline;
  margin: 0;
  font-weight: 500;
}

.toolbar select {
  width: auto;
  padding: 6px 10px;
}

.pager {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.pager button {
  min-height: 36px;
  padding: 6px 12px;
}

/* Kotalar sayfası */

.meter-row + .meter-row {
  margin-top: 14px;
}

.meter-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.92rem;
}

.meter {
  height: 10px;
  margin-top: 6px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.meter > div {
  height: 100%;
  background: var(--ok);
}

.meter.warn > div {
  background: var(--warn);
}

.meter.danger > div {
  background: var(--danger);
}

dl.facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 16px;
  margin: 14px 0 0;
  font-size: 0.92rem;
}

dl.facts dt {
  color: var(--muted);
}

dl.facts dd {
  margin: 0;
  font-weight: 600;
  text-align: right;
}

/* İşlem kaydı sütun filtreleri */

button.th-filter {
  min-height: 0;
  padding: 0;
  background: none;
  border: none;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
}

button.th-filter:hover,
button.th-filter.active {
  background: none;
  color: var(--primary);
}

button.th-filter.active {
  text-decoration: underline;
}

.filter-pop {
  position: absolute;
  z-index: 50;
  width: min(340px, calc(100vw - 16px));
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 8px 30px rgba(16, 24, 40, 0.18);
}

.filter-list {
  max-height: min(280px, 40vh);
  overflow-y: auto;
}

.filter-list .check {
  padding: 3px 0;
  font-size: 0.92rem;
}

.filter-summary {
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--info-bg);
}

th.select-col {
  width: 1%;
}

/* Öğrenci paneli: yan sütunda kalan süre sayacı */

.panel-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 20px;
  align-items: start;
}

.panel-layout.single {
  grid-template-columns: minmax(0, 1fr);
}

.panel-aside {
  position: sticky;
  top: 16px;
}

.countdown h2 {
  font-size: 1rem;
  margin-bottom: 10px;
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-bottom: 10px;
}

.countdown-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 2px;
  border-radius: 8px;
  background: var(--info-bg);
}

.countdown-value {
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.countdown-label {
  font-size: 0.72rem;
  color: var(--muted);
}

@media (max-width: 820px) {
  .panel-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  /* Telefonda sayaç en üstte görünür */
  .panel-aside {
    position: static;
    order: -1;
  }
}

/* KVKK metni */

.legal ul {
  margin: 0 0 12px;
  padding-left: 22px;
}

.legal li + li {
  margin-top: 4px;
}

/* Öğrenci paneli: dönem seçimi */

.period-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.period-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  color: var(--text);
  text-decoration: none;
}

.period-card:hover {
  border-color: var(--primary);
}

.period-card.active {
  border: 2px solid var(--primary);
  background: var(--info-bg);
}

.period-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 1.05rem;
}

.period-title {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}