/* ==========================================================================
   OPEN BLUE Admin Panel — Dark Theme CSS
   React Admin.tsx と同じ見た目を再現
   全クラス名に .oba- プレフィックス
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@700;800;900&family=Inter:wght@300;400;600;800&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

/* ---------- Variables ---------- */
:root {
  --oba-slate-50: #f8fafc;
  --oba-slate-100: #f1f5f9;
  --oba-slate-200: #e2e8f0;
  --oba-slate-300: #cbd5e1;
  --oba-slate-400: #94a3b8;
  --oba-slate-500: #64748b;
  --oba-slate-600: #475569;
  --oba-slate-700: #334155;
  --oba-slate-800: #1e293b;
  --oba-slate-900: #0f172a;
  --oba-blue-400: #00b1eb;
  --oba-blue-500: #00b1eb;
  --oba-blue-600: #388acc;
  --oba-emerald-400: #34d399;
  --oba-emerald-500: #10b981;
  --oba-emerald-600: #059669;
  --oba-red-400: #f87171;
  --oba-red-500: #ef4444;
  --oba-red-900: #7f1d1d;
  --oba-font-sans: 'Inter', 'Noto Sans JP', sans-serif;
  --oba-font-heading: 'Montserrat', 'Inter', 'Noto Sans JP', sans-serif;
}

/* ---------- Overlay Container ---------- */
#ob-admin-root {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999999;
  overflow-y: auto;
  background: var(--oba-slate-900);
  font-family: var(--oba-font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--oba-slate-100);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#ob-admin-root.oba-open {
  display: block;
  animation: oba-overlayIn 0.25s ease;
}

#ob-admin-root::-webkit-scrollbar { width: 8px; }
#ob-admin-root::-webkit-scrollbar-track { background: var(--oba-slate-900); }
#ob-admin-root::-webkit-scrollbar-thumb { background: var(--oba-slate-600); border-radius: 4px; }
#ob-admin-root::-webkit-scrollbar-thumb:hover { background: var(--oba-slate-500); }

@keyframes oba-overlayIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ---------- Scoped Reset ---------- */
#ob-admin-root *,
#ob-admin-root *::before,
#ob-admin-root *::after {
  box-sizing: border-box;
}

#ob-admin-root img {
  display: block;
  max-width: 100%;
  height: auto;
}

#ob-admin-root input,
#ob-admin-root textarea,
#ob-admin-root button {
  outline: none;
  font: inherit;
  font-weight: bold;
}

#ob-admin-root button {
  cursor: pointer;
}

#ob-admin-root a {
  color: inherit;
  text-decoration: none;
}

/* ============================== LOGIN ============================== */
.oba-login {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.oba-login__card {
  background: var(--oba-slate-800);
  padding: 40px 32px;
  border-radius: 16px;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
  width: 100%;
  max-width: 420px;
  border: 1px solid var(--oba-slate-700);
}

.oba-login__title {
  text-align: center;
  font-family: var(--oba-font-heading);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: #fff;
  margin-bottom: 32px;
}

.oba-login__error {
  background: rgba(127, 29, 29, 0.2);
  color: var(--oba-red-400);
  font-size: 0.875rem;
  font-weight: 700;
  text-align: center;
  padding: 10px;
  border-radius: 8px;
  margin-bottom: 16px;
}

.oba-login__back {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  margin-top: 24px;
  color: var(--oba-slate-500);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  transition: color 0.2s;
}

.oba-login__back:hover {
  color: var(--oba-slate-300);
}

/* ============================== HEADER ============================== */
.oba-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 48px;
  flex-wrap: wrap;
  gap: 16px;
}

.oba-header__left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.oba-header__back {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.2s;
  color: var(--oba-slate-100);
}

.oba-header__back:hover {
  background: rgba(255, 255, 255, 0.1);
}

.oba-header__title {
  font-family: var(--oba-font-heading);
  font-weight: 900;
  font-size: 1.875rem;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: #fff;
}

.oba-header__right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.oba-status {
  color: var(--oba-emerald-400);
  font-size: 0.875rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.3s;
}

.oba-status--visible {
  opacity: 1;
}

/* ============================== BUTTONS ============================== */
.oba-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  border-radius: 9999px;
  padding: 10px 24px;
  transition: all 0.2s;
  white-space: nowrap;
}

.oba-btn--primary {
  background: var(--oba-blue-600);
  color: #fff;
  box-shadow: 0 8px 24px rgba(0, 177, 235, 0.25);
}

.oba-btn--primary:hover {
  background: var(--oba-blue-500);
}

.oba-btn--success {
  background: var(--oba-emerald-600);
  color: #fff;
}

.oba-btn--success:hover {
  background: var(--oba-emerald-500);
}

.oba-btn--secondary {
  background: var(--oba-slate-700);
  color: #fff;
}

.oba-btn--secondary:hover {
  background: var(--oba-slate-600);
}

.oba-btn--danger-ghost {
  background: rgba(127, 29, 29, 0.3);
  color: var(--oba-red-400);
}

.oba-btn--danger-ghost:hover {
  background: rgba(127, 29, 29, 0.5);
}

.oba-btn--full {
  width: 100%;
}

.oba-btn--sm {
  padding: 6px 12px;
  font-size: 0.75rem;
  border-radius: 8px;
}

.oba-btn--icon {
  padding: 8px;
  border-radius: 8px;
}

/* ============================== FORM ELEMENTS ============================== */
.oba-label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--oba-slate-400);
  margin-bottom: 8px;
}

.oba-input {
  width: 100%;
  background: var(--oba-slate-900);
  border: 1px solid var(--oba-slate-700);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--oba-slate-100);
  transition: border-color 0.2s;
}

.oba-input:focus {
  border-color: var(--oba-blue-500);
}

.oba-input--sm {
  padding: 6px 8px;
  border-radius: 6px;
  font-size: 0.75rem;
}

.oba-input--link {
  color: var(--oba-blue-400);
}

.oba-textarea {
  width: 100%;
  background: var(--oba-slate-900);
  border: 1px solid var(--oba-slate-700);
  border-radius: 12px;
  padding: 12px 16px;
  color: var(--oba-slate-100);
  resize: none;
  transition: border-color 0.2s;
}

.oba-textarea:focus {
  border-color: var(--oba-blue-500);
}

.oba-form-group {
  margin-bottom: 16px;
}

/* ============================== GRID ============================== */
.oba-page {
  padding: 24px;
  min-height: 100vh;
}

.oba-container {
  max-width: 1152px;
  margin: 0 auto;
}

.oba-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .oba-page {
    padding: 48px;
  }

  .oba-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .oba-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.oba-grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .oba-grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================== EVENT CARD (Admin) ============================== */
.oba-card {
  background: var(--oba-slate-800);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--oba-slate-700);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  transition: transform 0.2s, box-shadow 0.2s;
}

.oba-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.oba-card__image {
  height: 160px;
  position: relative;
  overflow: hidden;
}

.oba-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
}

.oba-card__overlay {
  position: absolute;
  inset: 0;
  padding: 16px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.oba-card__date {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--oba-blue-400);
  background: rgba(15, 23, 42, 0.8);
  padding: 4px 8px;
  border-radius: 4px;
  align-self: flex-start;
  margin-bottom: 8px;
}

.oba-card__title {
  font-weight: 700;
  font-size: 1.125rem;
  color: #fff;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.oba-card__actions {
  display: flex;
  gap: 12px;
  padding: 16px;
}

.oba-card__edit {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  background: var(--oba-slate-700);
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--oba-slate-100);
  transition: background 0.2s;
}

.oba-card__edit:hover {
  background: var(--oba-slate-600);
}

.oba-card__delete {
  padding: 10px 12px;
  background: rgba(127, 29, 29, 0.3);
  color: var(--oba-red-400);
  border-radius: 8px;
  transition: background 0.2s;
}

.oba-card__delete:hover {
  background: rgba(127, 29, 29, 0.5);
}

/* ============================== EMPTY STATE ============================== */
.oba-empty {
  grid-column: 1 / -1;
  padding: 128px 24px;
  text-align: center;
  border: 2px dashed var(--oba-slate-700);
  border-radius: 24px;
  color: var(--oba-slate-500);
  font-style: italic;
}

/* ============================== EDITOR ============================== */
.oba-editor {
  background: var(--oba-slate-800);
  border-radius: 24px;
  border: 1px solid var(--oba-slate-700);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
  padding: 24px;
  animation: oba-fadeUp 0.3s ease;
}

@media (min-width: 768px) {
  .oba-editor {
    padding: 40px;
  }
}

@keyframes oba-fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.oba-editor__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--oba-slate-700);
}

.oba-editor__title {
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #fff;
}

.oba-editor__title svg {
  color: var(--oba-blue-400);
}

.oba-editor__close {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--oba-slate-100);
  transition: background 0.2s;
}

.oba-editor__close:hover {
  background: rgba(255, 255, 255, 0.1);
}

.oba-editor__footer {
  padding-top: 32px;
  margin-top: 40px;
  border-top: 1px solid var(--oba-slate-700);
  display: flex;
  justify-content: flex-end;
  gap: 16px;
}

/* ============================== ARRAY SECTION ============================== */
.oba-section {
  background: rgba(15, 23, 42, 0.5);
  padding: 24px;
  border-radius: 24px;
  border: 1px solid var(--oba-slate-700);
  margin-bottom: 24px;
}

.oba-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.oba-section__label {
  font-size: 0.75rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--oba-blue-400);
}

.oba-section__label--muted {
  color: var(--oba-slate-400);
}

.oba-section__add {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--oba-blue-400);
  transition: background 0.2s;
}

.oba-section__add:hover {
  background: rgba(0, 177, 235, 0.2);
}

.oba-section__item {
  background: var(--oba-slate-900);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--oba-slate-700);
  margin-bottom: 12px;
}

.oba-section__item:last-child {
  margin-bottom: 0;
}

.oba-section__row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}

.oba-section__row:last-child {
  margin-bottom: 0;
}

.oba-section__remove {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--oba-red-500);
  border-radius: 8px;
  transition: background 0.2s;
}

.oba-section__remove:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* Inline row (timeline/notes) */
.oba-inline-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 8px;
}

.oba-inline-row:last-child {
  margin-bottom: 0;
}

/* ============================== UPLOAD ============================== */
.oba-upload {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px;
  border: 2px dashed var(--oba-slate-600);
  border-radius: 12px;
  color: var(--oba-slate-400);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  margin-top: 12px;
}

.oba-upload:hover {
  border-color: var(--oba-blue-500);
  background: rgba(0, 177, 235, 0.05);
  color: var(--oba-blue-400);
}

.oba-upload--active {
  border-color: var(--oba-blue-500);
  background: rgba(0, 177, 235, 0.1);
  color: var(--oba-blue-400);
}

.oba-upload input[type="file"] {
  display: none;
}

/* ============================== IMAGE PREVIEW ============================== */
.oba-img-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.oba-img-preview {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--oba-slate-700);
  flex-shrink: 0;
  background: var(--oba-slate-900);
}

.oba-img-preview--lg {
  width: 100%;
  height: 160px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--oba-slate-700);
  background: var(--oba-slate-900);
  margin-bottom: 8px;
}

.oba-img-preview--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--oba-slate-600);
  font-size: 0.875rem;
}

.oba-img-preview img,
.oba-img-preview--lg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Speaker thumbnail */
.oba-speaker-thumb {
  width: 48px;
  height: 48px !important;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--oba-slate-600);
  flex-shrink: 0;
  background: var(--oba-slate-900);
  object-fit: cover !important;
}

.oba-speaker-thumb--empty {
  width: 48px;
  height: 48px !important;
  border-radius: 50%;
  border: 2px dashed var(--oba-slate-600);
  background: var(--oba-slate-900);
  flex-shrink: 0;
}

.oba-upload--sm {
  padding: 6px 12px;
  font-size: 0.75rem;
}

.oba-speaker-upload {
  margin-top: 0px !important;
}

/* ============================== TAB BAR ============================== */
.oba-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--oba-slate-800);
  padding: 4px;
  border-radius: 9999px;
  border: 1px solid var(--oba-slate-700);
}

.oba-tab {
  padding: 8px 24px;
  border-radius: 9999px;
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--oba-slate-400);
  transition: all 0.2s;
}

.oba-tab:hover { color: #fff; }

.oba-tab--active {
  background: var(--oba-blue-600);
  color: #fff;
  box-shadow: 0 4px 12px rgba(0,177,235,0.3);
}

/* ============================== MENTOR CARD (Admin) ============================== */
.oba-mentor-card {
  background: var(--oba-slate-800);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid var(--oba-slate-700);
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  width: 100%;
  min-width: 0;
  overflow: hidden;
}

.oba-mentor-card__img {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--oba-slate-700);
  flex-shrink: 0;
}

.oba-mentor-card__img img { width: 100%; height: 100%; object-fit: cover; }

.oba-mentor-card__info { flex: 1; min-width: 0; overflow: hidden; }

.oba-mentor-card__name { font-weight: 700; font-size: 1.125rem; color: #fff; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.oba-mentor-card__role { font-size: 0.75rem; color: var(--oba-slate-400); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.oba-mentor-card__actions { display: flex; gap: 8px; margin-top: 16px; }

.oba-mentor-card__actions .oba-card__edit { flex: 1; }

/* ============================== CURRICULUM TERM ============================== */
.oba-term {
  background: rgba(30,41,59,0.5);
  border-radius: 24px;
  padding: 32px;
  border: 1px solid var(--oba-slate-700);
  margin-bottom: 48px;
}

.oba-term:last-child { margin-bottom: 0; }

.oba-term__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.oba-term__title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--oba-blue-400);
}

.oba-term__add {
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--oba-slate-700);
  padding: 6px 12px;
  border-radius: 8px;
  color: var(--oba-slate-100);
  display: flex;
  align-items: center;
  gap: 4px;
  transition: background 0.2s;
}

.oba-term__add:hover { background: var(--oba-blue-600); }

.oba-session-row {
  background: var(--oba-slate-800);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--oba-slate-600);
  display: flex;
  gap: 16px;
  align-items: center;
  margin-bottom: 12px;
}

.oba-session-row:last-child { margin-bottom: 0; }

.oba-session-num {
  width: 40px;
  height: 40px;
  background: var(--oba-slate-700);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  color: var(--oba-slate-400);
  flex-shrink: 0;
}

.oba-session-info { flex: 1; min-width: 0; }

.oba-session-subtitle {
  font-size: 0.625rem;
  font-weight: 700;
  color: var(--oba-blue-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.oba-session-title { font-weight: 700; font-size: 0.875rem; color: #fff; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.oba-session-actions {
  display: flex;
  gap: 8px;
  opacity: 0;
  transition: opacity 0.2s;
}

.oba-session-row:hover .oba-session-actions { opacity: 1; }

.oba-session-actions button {
  padding: 8px;
  border-radius: 6px;
  transition: all 0.2s;
}

/* ============================== SPACING UTILS ============================== */
.oba-mb-6 { margin-bottom: 24px; }
.oba-mb-10 { margin-bottom: 40px; }
.oba-mt-3 { margin-top: 12px; }