:root {
  --bg: #0f1220;
  --bg-soft: #171b2e;
  --panel: #1c2138;
  --border: #2b3151;
  --text: #eef0fb;
  --text-dim: #a2a8c9;
  --accent: #7c9fff;
  --accent-soft: #3a4a8f;
  --user-bubble: #2c355c;
  --ai-bubble: #232a48;
  --radius: 16px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6fb;
    --bg-soft: #ffffff;
    --panel: #ffffff;
    --border: #e2e5f3;
    --text: #1b1e2e;
    --text-dim: #666c8a;
    --accent: #4a63e0;
    --accent-soft: #dbe2ff;
    --user-bubble: #dbe2ff;
    --ai-bubble: #f0f1f8;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Hiragino Sans", "Noto Sans JP", "Yu Gothic", system-ui, sans-serif;
}

a { color: inherit; }

.brand {
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}
.brand.small { font-size: 1rem; }
.brand-dot { color: var(--accent); }

/* ---------- Landing ---------- */
.landing {
  position: relative;
  overflow-x: hidden;
}

.bg-clock {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(circle at 80% 15%, var(--accent-soft) 0%, transparent 45%),
    radial-gradient(circle at 10% 90%, var(--accent-soft) 0%, transparent 40%);
  opacity: 0.5;
  pointer-events: none;
}

.landing-hero {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
  padding: 18vh 24px 10vh;
  text-align: center;
}

.landing-hero .brand {
  display: inline-block;
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
  color: var(--text-dim);
}

.catchphrase {
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  line-height: 1.35;
  margin: 0 0 1.5rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.lead {
  color: var(--text-dim);
  line-height: 1.9;
  font-size: 1rem;
  margin: 0 0 3rem;
}

.google-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  border-radius: 999px;
  background: var(--panel);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.google-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 28px rgba(0,0,0,0.2);
}

.sub-note {
  margin-top: 1.5rem;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.about-section {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
  text-align: left;
}
.about-section h2 {
  font-size: 1.1rem;
  margin-bottom: 0.8rem;
}
.about-section p {
  color: var(--text-dim);
  font-size: 0.9rem;
  line-height: 1.9;
}

/* ---------- Chat ---------- */
.chat-page {
  height: 100vh;
}

.app-layout {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--bg-soft);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: left 0.2s ease;
}

.sidebar.collapsed {
  left: -280px;
}

.sidebar-backdrop {
  display: none;
}

.sidebar-top {
  padding: 16px;
}

.new-conv-btn {
  width: 100%;
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}
.new-conv-btn:hover { border-color: var(--accent); }

.sidebar-search {
  padding: 0 16px 12px;
}
.sidebar-search input {
  width: 100%;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 0.85rem;
}

.hidden { display: none !important; }

.reminders-section {
  padding: 0 16px 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.reminders-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.reminder-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 8px;
}
.reminder-form input {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 0.8rem;
}
.reminder-form button {
  padding: 6px 10px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  cursor: pointer;
}

.reminder-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 160px;
  overflow-y: auto;
}

.reminder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  padding: 6px 8px;
  border-radius: 8px;
  background: var(--panel);
  font-size: 0.78rem;
}
.reminder-item .reminder-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}
.reminder-item .reminder-time {
  color: var(--text-dim);
  font-size: 0.72rem;
  white-space: nowrap;
}
.reminder-item button {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0 2px;
}
.reminder-item button:hover { color: #e5484d; }

.conv-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.conv-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 10px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-dim);
}
.conv-item:hover { background: var(--panel); }
.conv-item.active {
  background: var(--accent-soft);
  color: var(--text);
}
.conv-item-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.conv-item .conv-title {
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.conv-item .conv-snippet {
  font-size: 0.75rem;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.conv-delete-btn {
  flex-shrink: 0;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 4px 6px;
  border-radius: 6px;
  opacity: 0;
}
.conv-item:hover .conv-delete-btn { opacity: 1; }
.conv-delete-btn:hover { color: #e5484d; background: rgba(229, 72, 77, 0.12); }

/* ---------- サイドバーフッター・ユーザー設定モーダル ---------- */

.sidebar-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
}

.settings-btn {
  width: 100%;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: none;
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: left;
  cursor: pointer;
}
.settings-btn:hover {
  background: var(--panel);
  color: var(--text);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal {
  width: 90%;
  max-width: 420px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.modal-header h2 {
  font-size: 1.1rem;
  margin: 0;
}

.settings-account {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  margin-bottom: 20px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
}
.account-info { min-width: 0; }
.account-name {
  font-size: 0.95rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.account-email {
  font-size: 0.8rem;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.settings-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.settings-form label {
  font-size: 0.85rem;
  color: var(--text-dim);
}
.settings-form input,
.settings-form textarea {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 0.9rem;
  font-family: inherit;
  resize: vertical;
}
.settings-form button {
  align-self: flex-start;
  padding: 8px 18px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}
.settings-saved {
  color: var(--accent);
  font-size: 0.8rem;
  margin: 0;
}

.settings-integration {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  margin-bottom: 20px;
  border-radius: 12px;
  background: var(--panel);
  border: 1px solid var(--border);
}
.integration-title {
  font-size: 0.9rem;
  font-weight: 600;
}
.integration-status {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-top: 2px;
}
.integration-status.connected { color: var(--accent); }
.integration-btn {
  flex-shrink: 0;
  padding: 6px 14px;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}
.integration-btn:hover { opacity: 0.9; }

.settings-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
.settings-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.88rem;
}
.settings-links a:hover { color: var(--accent); }

.main-panel {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
}

.chat-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-dim);
  padding: 4px;
  border-radius: 8px;
  line-height: 1;
}
.icon-btn:hover { background: var(--panel); }
.icon-btn.active { color: var(--accent); }

.sidebar-toggle { display: none; }

@media (max-width: 860px) {
  .sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 30;
    box-shadow: 0 0 24px rgba(0, 0, 0, 0.3);
  }
  .sidebar-toggle { display: inline-block; }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 25;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
  }
  .sidebar-backdrop.visible {
    opacity: 1;
    pointer-events: auto;
  }
}

.header-time { text-align: center; }
.clock {
  font-variant-numeric: tabular-nums;
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.elapsed-banner {
  margin-top: 2px;
  font-size: 0.8rem;
  color: var(--accent);
  min-height: 1.1em;
}

.header-user {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.text-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  text-decoration: underline;
  padding: 0;
}

.chat-main {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

.messages {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.msg {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: var(--radius);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg.user {
  align-self: flex-end;
  background: var(--user-bubble);
  border-bottom-right-radius: 4px;
}

.msg.ai {
  align-self: flex-start;
  background: var(--ai-bubble);
  border-bottom-left-radius: 4px;
}

.msg.system {
  align-self: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  background: none;
  padding: 4px;
}

.msg.pending { opacity: 0.6; }

.msg-wrap {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.embed {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--panel);
}
.embed iframe {
  width: 100%;
  border: none;
  display: block;
}
.embed-youtube { aspect-ratio: 16 / 9; }
.embed-youtube iframe { height: 100%; }
.embed-map iframe { height: 320px; }
.msg-wrap.user { align-items: flex-end; }
.msg-wrap.ai { align-items: flex-start; }

.msg-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  color: var(--text-dim);
  opacity: 0;
  transition: opacity 0.15s ease;
  padding: 0 4px;
}
.msg-wrap:hover .msg-actions { opacity: 1; }

.msg-actions button {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.75rem;
  padding: 2px 4px;
}
.msg-actions button:hover { color: var(--accent); }
.msg-actions button:disabled {
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}

.variant-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.variant-nav button {
  padding: 0 4px;
  font-size: 0.85rem;
}

.composer {
  display: flex;
  gap: 10px;
  padding: 16px 20px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  max-width: 760px;
  width: 100%;
  margin: 0 auto;
}

.composer textarea {
  flex: 1;
  resize: none;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 12px 14px;
  font-size: 0.95rem;
  font-family: inherit;
  max-height: 140px;
}

.composer button {
  padding: 0 22px;
  border-radius: 14px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.composer button:disabled {
  opacity: 0.5;
  cursor: default;
}

/* ---------- Legal pages ---------- */
.legal-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  line-height: 1.9;
}

.legal-page .back-link {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.9rem;
}
.legal-page .back-link:hover { color: var(--accent); }

.legal-page h1 {
  font-size: 1.6rem;
  margin-bottom: 0.3rem;
}

.legal-page .updated {
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 2.5rem;
}

.legal-page h2 {
  font-size: 1.1rem;
  margin-top: 2.4rem;
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.legal-page p, .legal-page li {
  color: var(--text);
  font-size: 0.95rem;
}

.legal-page ul, .legal-page ol {
  padding-left: 1.4rem;
}

.legal-page a { color: var(--accent); }

.legal-page table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}
.legal-page th, .legal-page td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
  vertical-align: top;
}
.legal-page th {
  background: var(--bg-soft);
  width: 30%;
}

/* ---------- Footer ---------- */
.site-footer {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 24px 60px;
  text-align: center;
  position: relative;
  z-index: 1;
}
.site-footer nav {
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
  font-size: 0.82rem;
}
.site-footer a {
  color: var(--text-dim);
  text-decoration: none;
}
.site-footer a:hover { color: var(--accent); }