/* =====================================================
   アイデアマンAI — メインスタイルシート (BEM)
   ===================================================== */

/* ---------- CSS Variables ---------- */
:root {
  --font-sans: 'Noto Sans JP', sans-serif;

  --color-bg: #0f1117;
  --color-surface: #1a1d27;
  --color-surface-2: #232635;
  --color-border: #2e3251;
  --color-accent: #6c63ff;
  --color-accent-2: #a78bfa;
  --color-text: #e2e8f0;
  --color-text-muted: #8892b0;
  --color-user-bg: #1e3a5f;
  --color-ai-bg: #1a2035;
  --color-success: #10b981;
  --color-danger: #ef4444;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --sidebar-width: 260px;
  --transition: 0.2s ease;
}

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

html,
body {
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.6;
}

a {
  color: var(--color-accent-2);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

/* =====================================================
   CHAT LAYOUT
   ===================================================== */
.chat {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: 100vh;
  overflow: hidden;
}

/* ---------- Sidebar ---------- */
.sidebar {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.sidebar__header {
  padding: 20px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-border);
  gap: 8px;
}

.sidebar__brand {
  font-weight: 700;
  font-size: 16px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.sidebar__new-btn {
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: #fff;
  transition: opacity var(--transition);
}

.sidebar__new-btn:hover {
  opacity: 0.85;
}

.sidebar__list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 0;
  list-style: none;
}

.sidebar__item {}

.sidebar__item-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-radius: 0;
  transition: background var(--transition);
  color: var(--color-text-muted);
  border-left: 3px solid transparent;
}

.sidebar__item-link:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
  text-decoration: none;
}

.sidebar__item--active .sidebar__item-link {
  background: var(--color-surface-2);
  border-left-color: var(--color-accent);
  color: var(--color-text);
}

.sidebar__item-title {
  font-size: 13px;
  flex: 1;
}

.sidebar__item-date {
  font-size: 11px;
  color: var(--color-text-muted);
  margin-left: 8px;
}

/* 削除ボタン */
.sidebar__item {
  position: relative;
  display: flex;
  align-items: center;
}

.sidebar__item-link {
  flex: 1;
  min-width: 0;
}

.sidebar__item-delete-form {
  flex-shrink: 0;
  padding-right: 8px;
  opacity: 0;
  transition: opacity var(--transition);
}

.sidebar__item:hover .sidebar__item-delete-form {
  opacity: 1;
}

.sidebar__item-delete-btn {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  font-size: 14px;
  line-height: 1;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}

.sidebar__item-delete-btn:hover {
  background: var(--color-danger);
  color: #fff;
}

.sidebar__footer {
  padding: 16px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar__profile-link {
  font-size: 12px;
  color: var(--color-text-muted);
}

.sidebar__logout-btn {
  font-size: 12px;
  color: var(--color-text-muted);
  text-align: left;
  transition: color var(--transition);
}

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

/* ---------- Chat Main ---------- */
.chat__main {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.chat__header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.chat__title {
  font-size: 15px;
  font-weight: 500;
}

.chat__messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scroll-behavior: smooth;
}

.chat__empty {
  text-align: center;
  color: var(--color-text-muted);
  margin: auto;
  font-size: 14px;
}

/* ---------- Message ---------- */
.chat__message {
  display: flex;
  gap: 12px;
  max-width: 800px;
  animation: fadeInUp 0.25s ease;
}

.chat__message--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat__message--assistant {
  align-self: flex-start;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.avatar--user {
  background: var(--color-accent);
  color: #fff;
}

.avatar--assistant {
  background: linear-gradient(135deg, #6c63ff, #a78bfa);
  color: #fff;
}

.chat__message__body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: calc(100% - 48px);
}

.chat__message__content {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  line-height: 1.7;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}

.chat__message--user .chat__message__content {
  background: var(--color-user-bg);
  border-bottom-right-radius: 4px;
}

.chat__message--assistant .chat__message__content {
  background: var(--color-ai-bg);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: 4px;
}

.chat__message__time {
  font-size: 11px;
  color: var(--color-text-muted);
}

.chat__message--user .chat__message__time {
  text-align: right;
}

/* ---------- Loading Indicator ---------- */
.chat__loading {
  display: flex;
  align-items: center;
  padding: 8px 0;
}

.chat__loading[hidden] {
  display: none;
}

.chat__loading__dots {
  display: flex;
  gap: 5px;
}

.chat__loading__dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: pulse 1.2s infinite;
}

.chat__loading__dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.chat__loading__dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes pulse {

  0%,
  80%,
  100% {
    opacity: 0.2;
  }

  40% {
    opacity: 1;
  }
}

/* ---------- Input Area ---------- */
.chat__input-area {
  padding: 16px 24px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.chat__input-form {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 12px 16px;
  transition: border-color var(--transition);
}

.chat__input-form:focus-within {
  border-color: var(--color-accent);
}

.chat__input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--color-text);
  font-family: inherit;
  font-size: 14px;
  line-height: 1.6;
  resize: none;
  max-height: 200px;
  overflow-y: auto;
}

.chat__input::placeholder {
  color: var(--color-text-muted);
}

.chat__send-btn {
  padding: 8px 20px;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: opacity var(--transition), transform var(--transition);
  white-space: nowrap;
}

.chat__send-btn:hover {
  opacity: 0.85;
}

.chat__send-btn:active {
  transform: scale(0.97);
}

/* =====================================================
   AUTH PAGES
   ===================================================== */
.auth-page {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.auth {
  width: 100%;
  max-width: 420px;
  padding: 24px;
}

.auth__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.auth__title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 28px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth__field {
  margin-bottom: 20px;
}

.auth__label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
  color: var(--color-text-muted);
}

.auth__field input {
  width: 100%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  color: var(--color-text);
  font-size: 14px;
  transition: border-color var(--transition);
  outline: none;
  font-family: inherit;
}

.auth__field input:focus {
  border-color: var(--color-accent);
}

.auth__errors {
  list-style: none;
  margin-top: 6px;
}

.auth__errors li {
  font-size: 12px;
  color: var(--color-danger);
}

.auth__submit-btn {
  width: 100%;
  padding: 12px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  transition: opacity var(--transition);
  margin-top: 8px;
}

.auth__submit-btn:hover {
  opacity: 0.88;
}

.auth__link {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 16px;
  text-align: center;
}

/* =====================================================
   ADMIN DASHBOARD
   ===================================================== */
.admin-page {}

.admin-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
  height: 56px;
}

.admin-nav__brand {
  font-weight: 700;
  color: var(--color-accent);
}

.admin-nav__link {
  font-size: 13px;
  color: var(--color-text-muted);
  padding: 4px 0;
}

.admin-nav__link:hover {
  color: var(--color-text);
  text-decoration: none;
}

.admin-content {
  padding: 32px 40px;
  max-width: 1200px;
}

.admin-content h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 24px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.stat-card__label {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.stat-card__value {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-accent-2);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  color: var(--color-text-muted);
  font-weight: 500;
}

.data-table tr:hover td {
  background: var(--color-surface);
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  transition: opacity var(--transition);
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}

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

.btn:hover {
  opacity: 0.85;
}

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

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--color-text);
  font-size: 13px;
  font-family: inherit;
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
}

/* =====================================================
   SCROLLBAR
   ===================================================== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}