/* ═══════════════════════════════════════════════════════════════════
   KamiMail – Cupertino Design System
   ═══════════════════════════════════════════════════════════════════ */

:root {
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  --bg: #f5f5f7; --bg-elevated: #ffffff;
  --bg-glass: rgba(255,255,255,0.72); --bg-glass-heavy: rgba(255,255,255,0.88);
  --border: rgba(0,0,0,0.08); --border-strong: rgba(0,0,0,0.14);
  --text-primary: #1d1d1f; --text-secondary: #6e6e73; --text-tertiary: #aeaeb2;
  --accent: #5856D6; --accent-hover: #4a48c4;
  --accent-light: rgba(88,86,214,0.1);
  --accent-gradient: linear-gradient(135deg, #5856D6 0%, #FF2D55 100%);
  --success: #34C759; --warning: #FF9500; --danger: #FF3B30; --info: #007AFF;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-accent: 0 4px 14px rgba(88,86,214,0.3);
  --radius-sm: 8px; --radius-md: 12px; --radius-lg: 16px; --radius-xl: 20px; --radius-full: 999px;
  --transition: 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-spring: 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] {
  --bg: #000000; --bg-elevated: #1c1c1e;
  --bg-glass: rgba(44,44,46,0.72); --bg-glass-heavy: rgba(44,44,46,0.88);
  --border: rgba(255,255,255,0.08); --border-strong: rgba(255,255,255,0.16);
  --text-primary: #f5f5f7; --text-secondary: #98989d; --text-tertiary: #636366;
  --accent: #7B79E0; --accent-hover: #9593eb;
  --accent-light: rgba(123,121,224,0.15);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3); --shadow-md: 0 4px 14px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.5);
  --shadow-accent: 0 4px 14px rgba(123,121,224,0.35);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font); background: var(--bg); color: var(--text-primary);
  line-height: 1.5; min-height: 100vh;
  transition: background var(--transition), color var(--transition); overflow-x: hidden;
}

/* ── Header ────────────────────────────────────────────────────── */
.app-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--bg-glass-heavy);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border); transition: background var(--transition);
}
.header-inner {
  max-width: 960px; margin: 0 auto; padding: 0 24px; height: 56px;
  display: flex; align-items: center; justify-content: space-between;
}
.header-brand { display: flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.brand-icon { width: 28px; height: 28px; }
.brand-text {
  font-size: 1.125rem; font-weight: 700;
  background: var(--accent-gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
}
.header-actions { display: flex; align-items: center; gap: 4px; }

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }

/* ── App Grid ──────────────────────────────────────────────────── */
.app-grid-trigger { position: relative; }
.app-grid-menu {
  position: absolute; top: 48px; right: 0; width: 280px; padding: 16px;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: scale(0.95) translateY(-8px);
  transition: all var(--transition); z-index: 200;
}
.app-grid-menu.open { opacity: 1; visibility: visible; transform: scale(1) translateY(0); }
.app-grid-title {
  font-size: 0.6875rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-tertiary); margin-bottom: 12px; padding: 0 4px;
}
.app-grid-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; list-style: none; }
.app-grid-item {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 16px 8px; border-radius: var(--radius-md);
  text-decoration: none; color: var(--text-primary); transition: all var(--transition); cursor: pointer;
}
.app-grid-item:hover { background: var(--accent-light); }
.app-grid-item.active { background: var(--accent-light); }
.app-grid-icon { width: 40px; height: 40px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.app-grid-label { font-size: 0.75rem; font-weight: 600; text-align: center; line-height: 1.3; }

/* ── Buttons ───────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; border: none; border-radius: var(--radius-full);
  font-family: var(--font); font-size: 0.9375rem; font-weight: 600;
  cursor: pointer; transition: all var(--transition); user-select: none; white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow-accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; transform: none; }
.btn-secondary { background: var(--accent-light); color: var(--accent); border: 1px solid transparent; }
.btn-secondary:hover { background: var(--accent); color: #fff; }
.btn-sm { padding: 7px 14px; font-size: 0.8125rem; }
.btn-danger { background: rgba(255,59,48,0.1); color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-icon {
  width: 40px; height: 40px; border: none; border-radius: var(--radius-md);
  background: transparent; color: var(--text-primary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all var(--transition);
}
.btn-icon:hover { background: var(--accent-light); color: var(--accent); }
.btn-icon svg { width: 20px; height: 20px; }

/* ── Inputs ────────────────────────────────────────────────────── */
.input, .textarea {
  width: 100%; padding: 10px 16px;
  background: var(--bg-elevated); color: var(--text-primary);
  border: 1.5px solid var(--border-strong); border-radius: var(--radius-md);
  font-family: var(--font); font-size: 0.9375rem;
  transition: all var(--transition); outline: none;
}
.input::placeholder, .textarea::placeholder { color: var(--text-tertiary); }
.input:focus, .textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-light); }
.textarea { min-height: 120px; resize: vertical; line-height: 1.6; }

/* ── Glass Card ────────────────────────────────────────────────── */
.glass-card {
  background: var(--bg-glass); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-md);
}

/* ── Views ─────────────────────────────────────────────────────── */
.app-main { padding-top: 56px; min-height: 100vh; }
.view { display: none; opacity: 0; animation: viewFadeIn 0.35s ease forwards; }
.view.active { display: block; opacity: 1; }
@keyframes viewFadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }

/* ── Login View ────────────────────────────────────────────────── */
.login-container { max-width: 480px; margin: 0 auto; padding: 48px 24px 64px; }
.home-hero { text-align: center; margin-bottom: 48px; }
.hero-icon-wrapper { display: inline-block; margin-bottom: 20px; animation: heroFloat 6s ease-in-out infinite; }
.hero-icon { width: 80px; height: 80px; }
@keyframes heroFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.hero-title {
  font-size: 2.5rem; font-weight: 800; letter-spacing: -0.03em;
  background: var(--accent-gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text; margin-bottom: 8px;
}
.hero-subtitle { font-size: 1.125rem; color: var(--text-secondary); max-width: 440px; margin: 0 auto; line-height: 1.6; }

.login-card { padding: 28px; }
.login-form { display: flex; flex-direction: column; gap: 14px; }
.form-group { display: flex; flex-direction: column; gap: 5px; }
.form-label { font-size: 0.8125rem; font-weight: 600; color: var(--text-secondary); }
.form-row { display: grid; grid-template-columns: 1fr 100px; gap: 10px; }
.form-divider {
  text-align: center; font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-tertiary); margin: 6px 0;
  display: flex; align-items: center; gap: 12px;
}
.form-divider::before, .form-divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.saved-accounts { margin-top: 32px; }
.saved-accounts-title {
  font-size: 0.8125rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--text-tertiary); margin-bottom: 12px; padding: 0 4px;
}
.saved-accounts-list { display: flex; flex-direction: column; gap: 6px; }
.saved-account-item {
  display: flex; align-items: center; gap: 12px; padding: 12px 14px;
  background: var(--bg-glass); border: 1px solid var(--border); border-radius: var(--radius-md);
  cursor: pointer; transition: all var(--transition);
}
.saved-account-item:hover { border-color: var(--accent); background: var(--accent-light); }
.saved-account-avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--accent-gradient); display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 700; font-size: 0.875rem; flex-shrink: 0;
}
.saved-account-info { flex: 1; min-width: 0; }
.saved-account-email { font-size: 0.875rem; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.saved-account-host { font-size: 0.6875rem; color: var(--text-tertiary); }
.saved-account-remove {
  width: 28px; height: 28px; border: none; border-radius: var(--radius-sm);
  background: transparent; color: var(--text-tertiary);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all var(--transition); opacity: 0;
}
.saved-account-item:hover .saved-account-remove { opacity: 1; }
.saved-account-remove:hover { color: var(--danger); }

.home-features { display: flex; justify-content: center; gap: 32px; flex-wrap: wrap; margin-top: 40px; }
.feature-item { display: flex; align-items: center; gap: 8px; font-size: 0.875rem; color: var(--text-secondary); }
.feature-icon { font-size: 1.125rem; }

/* ── Mailbox View ──────────────────────────────────────────────── */
.mailbox-layout { display: flex; min-height: calc(100vh - 56px); }
.sidebar {
  width: 220px; flex-shrink: 0; padding: 16px 12px;
  background: var(--bg-glass-heavy); border-right: 1px solid var(--border);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  overflow-y: auto; transition: margin var(--transition), transform var(--transition);
  display: flex; flex-direction: column;
}
.sidebar.collapsed { margin-left: -220px; }
.sidebar-backdrop {
  display: none; position: fixed; top: 56px; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.3); z-index: 89;
}
.sidebar-user { padding: 8px; margin-bottom: 16px; text-align: center; }
.sidebar-user-email { font-size: 0.75rem; font-weight: 600; color: var(--text-secondary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-section-title {
  font-size: 0.625rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-tertiary); padding: 8px 10px 4px; margin-top: 8px;
}
.folder-list { list-style: none; }
.folder-item {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px;
  border-radius: var(--radius-sm); font-size: 0.8125rem; font-weight: 500;
  color: var(--text-secondary); cursor: pointer; transition: all var(--transition);
}
.folder-item:hover { background: var(--accent-light); color: var(--text-primary); }
.folder-item.active { background: var(--accent-light); color: var(--accent); font-weight: 600; }
.folder-item svg { width: 16px; height: 16px; flex-shrink: 0; }
.folder-item-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.sidebar-btn {
  display: flex; align-items: center; gap: 8px; width: 100%; padding: 10px;
  border: none; border-radius: var(--radius-md); background: var(--accent);
  color: white; font-family: var(--font); font-size: 0.8125rem; font-weight: 600;
  cursor: pointer; transition: all var(--transition); margin-bottom: 12px;
}
.sidebar-btn:hover { background: var(--accent-hover); }
.sidebar-btn svg { width: 16px; height: 16px; }

/* ── Message List ──────────────────────────────────────────────── */
.mail-content { flex: 1; min-width: 0; }
.mail-toolbar {
  display: flex; align-items: center; gap: 8px; padding: 10px 20px;
  border-bottom: 1px solid var(--border); background: var(--bg-glass);
  backdrop-filter: blur(20px);
}
.mail-toolbar-title { flex: 1; font-size: 0.875rem; font-weight: 600; }
.mail-toolbar-info { font-size: 0.75rem; color: var(--text-tertiary); }

.message-list { overflow-y: auto; max-height: calc(100vh - 56px - 48px); }
.message-item {
  display: flex; align-items: center; gap: 14px; padding: 14px 20px;
  border-bottom: 1px solid var(--border); cursor: pointer;
  transition: all var(--transition); animation: viewFadeIn 0.25s ease forwards;
}
.message-item:hover { background: var(--accent-light); }
.message-item.unread { background: var(--bg-elevated); }
.message-item.unread .msg-subject { font-weight: 700; }
.message-item.unread .msg-from { font-weight: 600; }
.message-item.active { background: var(--accent-light); border-left: 3px solid var(--accent); }

.msg-indicator { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.msg-indicator.unread { background: var(--accent); }

.msg-content { flex: 1; min-width: 0; }
.msg-top { display: flex; align-items: baseline; gap: 8px; margin-bottom: 2px; }
.msg-from { font-size: 0.875rem; font-weight: 500; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-date { font-size: 0.6875rem; color: var(--text-tertiary); flex-shrink: 0; font-variant-numeric: tabular-nums; }
.msg-subject { font-size: 0.8125rem; color: var(--text-primary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg-preview { font-size: 0.75rem; color: var(--text-tertiary); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-top: 1px; }

.pagination-bar {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 20px; border-top: 1px solid var(--border);
}

/* ── Message Reader ────────────────────────────────────────────── */
.reader-container { max-width: 800px; margin: 0 auto; padding: 24px; }
.reader-header { margin-bottom: 24px; }
.reader-back { margin-bottom: 16px; }
.reader-subject { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 16px; }
.reader-meta {
  display: flex; align-items: center; gap: 12px; padding: 14px 16px;
  background: var(--bg-glass); border: 1px solid var(--border); border-radius: var(--radius-md);
}
.reader-avatar {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--accent-gradient); display: flex; align-items: center; justify-content: center;
  color: white; font-weight: 700; font-size: 1rem; flex-shrink: 0;
}
.reader-meta-info { flex: 1; min-width: 0; }
.reader-from { font-size: 0.875rem; font-weight: 600; }
.reader-to { font-size: 0.75rem; color: var(--text-tertiary); }
.reader-date { font-size: 0.75rem; color: var(--text-tertiary); flex-shrink: 0; }

.reader-actions { display: flex; gap: 8px; margin: 16px 0; flex-wrap: wrap; }

.reader-img-banner {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; margin-bottom: 12px;
  background: rgba(255,149,0,0.08); border: 1px solid rgba(255,149,0,0.25);
  border-radius: var(--radius-md); font-size: 0.8125rem; color: var(--warning);
  animation: viewFadeIn 0.3s ease forwards;
}
.reader-img-banner span { flex: 1; }
.reader-img-banner .btn { flex-shrink: 0; }
.reader-body {
  padding: 24px; background: var(--bg-elevated);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  font-size: 0.9375rem; line-height: 1.7; overflow-x: auto;
}
.reader-body iframe {
  width: 100%; border: none; min-height: 200px;
}
.reader-attachments { margin-top: 16px; }
.reader-attachments-title {
  font-size: 0.8125rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.04em; color: var(--text-tertiary); margin-bottom: 8px;
}
.attachment-item {
  display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px;
  background: var(--bg-glass); border: 1px solid var(--border); border-radius: var(--radius-md);
  font-size: 0.8125rem; color: var(--text-secondary); margin: 0 6px 6px 0;
}

/* ── Compose View ──────────────────────────────────────────────── */
.compose-container { max-width: 680px; margin: 0 auto; padding: 24px; }
.compose-header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.compose-title { flex: 1; font-size: 1.25rem; font-weight: 700; }
.compose-card { padding: 24px; }
.compose-form { display: flex; flex-direction: column; gap: 14px; }
.compose-actions { display: flex; gap: 12px; margin-top: 8px; }

/* ── Loading & Toast ───────────────────────────────────────────── */
.loading-container { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 60px 20px; gap: 16px; }
.loading-spinner {
  width: 36px; height: 36px; border: 3px solid var(--border);
  border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-text { font-size: 0.875rem; color: var(--text-secondary); }

.toast-container {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  z-index: 1000; display: flex; flex-direction: column-reverse; gap: 8px; pointer-events: none;
}
.toast {
  padding: 12px 20px; border-radius: var(--radius-full);
  background: var(--bg-elevated); color: var(--text-primary);
  border: 1px solid var(--border); box-shadow: var(--shadow-lg);
  font-size: 0.875rem; font-weight: 500; white-space: nowrap; pointer-events: auto;
  animation: toastIn 0.35s var(--transition-spring) forwards;
}
.toast.toast-out { animation: toastOut 0.25s ease forwards; }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }
@keyframes toastIn { from { opacity: 0; transform: translateY(16px) scale(0.95); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes toastOut { from { opacity: 1; transform: translateY(0) scale(1); } to { opacity: 0; transform: translateY(8px) scale(0.95); } }

.no-records { text-align: center; padding: 60px 20px; color: var(--text-tertiary); }
.no-records-icon { font-size: 2.5rem; margin-bottom: 12px; }
.no-records p { font-size: 0.9375rem; }

/* ── Responsive ────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed; top: 56px; left: 0; bottom: 0; z-index: 90;
    width: 260px; margin-left: 0;
    transform: translateX(-100%);
  }
  .sidebar.collapsed { margin-left: 0; transform: translateX(-100%); }
  .sidebar.mobile-open { transform: translateX(0); }
  .sidebar-backdrop.visible { display: block; }
  .hero-title { font-size: 2rem; }
  .form-row { grid-template-columns: 1fr; }
  .reader-container { padding: 16px; }
  .reader-subject { font-size: 1.25rem; }
  .reader-meta { flex-wrap: wrap; }
  .app-grid-menu { right: -60px; }
  .home-features { flex-direction: column; align-items: center; gap: 16px; }
}