/*
 * Admin UI styles: login, dashboard, presentation detail (dropzone + slide grid).
 * Minimal, neutral palette, flexbox/grid layout, mobile-friendly.
 *
 * Class names here match exactly what templates/admin/*.php render and what
 * admin.js selects — do not rename without updating both.
 */

:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-border: #e2e4e9;
  --color-border-strong: #cbd0d9;
  --color-text: #1c1f26;
  --color-text-muted: #6b7280;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-contrast: #ffffff;
  --color-danger: #dc2626;
  --color-danger-hover: #b91c1c;
  --color-danger-contrast: #ffffff;
  --color-success: #16a34a;
  --color-focus-ring: rgba(37, 99, 235, 0.35);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 12px rgba(16, 24, 40, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

.admin-body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3 {
  margin: 0 0 0.5em;
  font-weight: 600;
  line-height: 1.25;
}

p {
  margin: 0 0 1em;
  color: var(--color-text-muted);
}

/* ---------- Layout shell ---------- */

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.admin-header__title {
  font-size: 1.125rem;
  font-weight: 700;
  margin: 0;
}

.admin-main {
  flex: 1;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.breadcrumb {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.logout-form {
  margin: 0;
}

.admin-header__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* ---------- Cards / surfaces ---------- */

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

.card__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 1rem;
}

.card__hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: -0.5rem 0 1rem;
}

.card__hint--after {
  margin: 1.25rem 0 0;
}

.card--narrow {
  max-width: 460px;
}

.attachment-current {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  margin-bottom: 1rem;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md, 8px);
}

.attachment-current__name {
  font-size: 0.9rem;
  font-weight: 600;
  overflow-wrap: anywhere;
  margin-right: auto;
}

/* ---------- Login form ---------- */

.admin-body--login .login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.login-form {
  width: 100%;
  max-width: 380px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
}

.login-form__title {
  text-align: center;
  margin-bottom: 1.5rem;
}

/* ---------- Forms ---------- */

.form-field {
  margin-bottom: 1.25rem;
}

.form-field:last-of-type {
  margin-bottom: 1rem;
}

.form-field label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
  color: var(--color-text);
}

.form-field input[type="text"],
.form-field input[type="password"] {
  display: block;
  width: 100%;
  padding: 0.625rem 0.75rem;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-field input:hover {
  border-color: var(--color-text-muted);
}

.form-field input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.form-error,
.form-success,
.form-notice {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  border: 1px solid #fecaca;
  background-color: #fef2f2;
  color: #991b1b;
}

.form-success {
  border-color: #bbf7d0;
  background-color: #f0fdf4;
  color: #166534;
}

.form-notice {
  border-color: #fde68a;
  background-color: #fffbeb;
  color: #92400e;
}

.form-notice a {
  font-weight: 600;
  color: inherit;
  text-decoration: underline;
}

.form-hint {
  margin: 0.375rem 0 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.empty-state {
  color: var(--color-text-muted);
  text-align: center;
  padding: 2rem 1rem;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5625rem 1.125rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  line-height: 1.2;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.05s ease;
}

.btn:hover {
  background-color: var(--color-bg);
  border-color: var(--color-text-muted);
  text-decoration: none;
}

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}

.btn--primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-contrast);
}

.btn--primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.btn--danger {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: var(--color-danger-contrast);
}

.btn--danger:hover {
  background-color: var(--color-danger-hover);
  border-color: var(--color-danger-hover);
}

.btn--ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--color-text-muted);
}

.btn--ghost:hover {
  background-color: var(--color-bg);
  color: var(--color-text);
}

.btn--small {
  padding: 0.3125rem 0.75rem;
  font-size: 0.8125rem;
}

.btn.is-success {
  background-color: #f0fdf4;
  border-color: #bbf7d0;
  color: #166534;
}

.btn.is-error {
  background-color: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}

/* ---------- Table ---------- */

/* На узком экране прокручивается таблица, а не вся страница. */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.presentations-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.presentations-table th,
.presentations-table td {
  padding: 0.875rem 1.25rem;
  text-align: left;
  vertical-align: middle;
  border-bottom: 1px solid var(--color-border);
}

.presentations-table th {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
  background-color: var(--color-bg);
}

.presentations-table tbody tr:last-child td {
  border-bottom: none;
}

.presentations-table tbody tr:hover {
  background-color: var(--color-bg);
}

/* ---------- Dropzone ---------- */

.dropzone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-align: center;
  padding: 2.5rem 1.5rem;
  border: 2px dashed var(--color-border-strong);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--color-primary);
  background-color: #f5f8ff;
  outline: none;
}

.dropzone--active {
  border-color: var(--color-primary);
  background-color: #eff4ff;
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

/* Идёт загрузка: новые файлы можно добавлять — они встанут в очередь. */
.dropzone--busy {
  border-style: solid;
  border-color: var(--color-primary);
}

.dropzone__text {
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
}

.dropzone__hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ---------- Upload progress ---------- */

.upload-progress {
  margin-top: 1rem;
}

.upload-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 0.375rem;
  overflow-wrap: anywhere;
}

.upload-progress-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  margin: 0 0 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.progress {
  width: 100%;
  height: 10px;
  border: none;
  border-radius: 999px;
  overflow: hidden;
  background-color: var(--color-border);
  -webkit-appearance: none;
  appearance: none;
}

.progress::-webkit-progress-bar {
  background-color: var(--color-border);
  border-radius: 999px;
}

.progress::-webkit-progress-value {
  background-color: var(--color-primary);
  border-radius: 999px;
  transition: width 0.2s ease;
}

.progress::-moz-progress-bar {
  background-color: var(--color-primary);
  border-radius: 999px;
}

.upload-progress-errors {
  list-style: none;
  margin: 0.75rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.upload-progress-errors li {
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  border: 1px solid #fecaca;
  background-color: #fef2f2;
  color: #991b1b;
  overflow-wrap: anywhere;
}

/* ---------- Slide grid ---------- */

.slides-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.slide-thumb {
  position: relative;
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.slide-thumb:hover {
  box-shadow: var(--shadow-md);
}

.slide-thumb__img {
  display: block;
  width: 100%;
  /* Слайд целиком, без обрезки краёв: превью должно показывать то же,
     что увидят зрители. */
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background-color: var(--color-bg);
}

.slide-thumb__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.625rem;
  border-top: 1px solid var(--color-border);
}

.slide-thumb__position {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  .admin-header {
    padding: 0.875rem 1rem;
  }

  .admin-main {
    padding: 1.5rem 1rem 3rem;
  }

  .presentations-table th,
  .presentations-table td {
    padding: 0.625rem 0.75rem;
    font-size: 0.875rem;
  }

  .slides-grid {
    grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
    gap: 0.75rem;
  }

  .login-form {
    padding: 1.5rem;
  }

  .dropzone {
    padding: 1.75rem 1rem;
  }
}