/* ==========================================================================
   Kitty — Design System
   Minimal, modern, dark palette. Light black / dark gray / gray.
   ========================================================================== */

:root {
  --bg: #0d0d0f;
  --bg-elevated: #131316;
  --bg-card: #17171b;
  --bg-hover: #1e1e23;
  --border: #26262c;
  --border-strong: #34343c;

  --text-primary: #f4f4f5;
  --text-secondary: #a1a1aa;
  --text-muted: #6b6b74;

  --accent: #e4e4e7;
  --accent-dim: #52525b;

  --success: #4ade80;
  --danger: #f87171;
  --warning: #fbbf24;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.55);

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --container: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.02em; }
p { margin: 0; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

::selection { background: var(--border-strong); color: var(--text-primary); }

/* --------------------------------- Nav ---------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 15, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
}

.brand-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--text-primary);
  color: var(--bg);
  border-radius: 8px;
  font-weight: 800;
  font-size: 15px;
}
img.brand-mark { background: none; border-radius: 0; display: block; object-fit: contain; }
.brand-mark.small { width: 24px; height: 24px; font-size: 12px; border-radius: 6px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14.5px;
  font-weight: 500;
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-hover); }
.nav-link.active { color: var(--text-primary); }
.nav-link-admin { color: var(--warning); }
.nav-link-admin:hover { color: var(--warning); background: rgba(251, 191, 36, 0.08); }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.nav-user {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 6px;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 13.5px;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-user:hover { background: var(--bg-hover); border-color: var(--border-strong); }
.nav-avatar { width: 24px; height: 24px; border-radius: 50%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span { width: 20px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: transform 0.2s var(--ease), opacity 0.2s var(--ease); }

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease), opacity 0.15s var(--ease);
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--text-primary); color: var(--bg); }
.btn-primary:hover:not(:disabled) { background: #fff; box-shadow: var(--shadow-sm); }

.btn-secondary { background: var(--bg-card); color: var(--text-primary); border-color: var(--border); }
.btn-secondary:hover:not(:disabled) { background: var(--bg-hover); border-color: var(--border-strong); }

.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover:not(:disabled) { color: var(--text-primary); background: var(--bg-hover); }

.btn-danger { background: rgba(248, 113, 113, 0.12); color: var(--danger); border-color: rgba(248, 113, 113, 0.25); }
.btn-danger:hover:not(:disabled) { background: rgba(248, 113, 113, 0.2); }

.btn-sm { padding: 8px 14px; font-size: 13.5px; }
.btn-block { width: 100%; }

.btn .spinner { display: none; }
.btn.is-loading .btn-label { visibility: hidden; }
.btn.is-loading .spinner {
  display: block;
  position: absolute;
  width: 16px; height: 16px;
  border: 2px solid rgba(0,0,0,0.2);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.btn { position: relative; }

@keyframes spin { to { transform: rotate(360deg); } }

/* -------------------------------- Hero ----------------------------------- */

.hero {
  padding: 120px 24px 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 28px;
  opacity: 0;
  animation: fadeUp 0.6s var(--ease) 0.05s forwards;
}

.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--success); }

.hero h1 {
  font-size: clamp(44px, 8vw, 84px);
  line-height: 1;
  margin-bottom: 22px;
  opacity: 0;
  animation: fadeUp 0.7s var(--ease) 0.12s forwards;
}

.hero p.lead {
  font-size: 19px;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  opacity: 0;
  animation: fadeUp 0.7s var(--ease) 0.2s forwards;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.7s var(--ease) 0.28s forwards;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

/* -------------------------------- Sections -------------------------------- */

.section {
  padding: 80px 24px;
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 52px;
}

.section-eyebrow {
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 10px;
  display: block;
}

.section-header h2 { font-size: clamp(28px, 4vw, 38px); margin-bottom: 14px; }
.section-header p { color: var(--text-secondary); font-size: 16px; }

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

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: var(--container);
  margin: 0 auto;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  background: var(--bg-hover);
}

.card-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 18px;
  color: var(--text-primary);
}

.card h3 { font-size: 17px; margin-bottom: 8px; }
.card p { color: var(--text-secondary); font-size: 14.5px; }

/* ------------------------------ Update cards ------------------------------ */

.update-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
  animation: fadeUp 0.5s var(--ease) forwards;
}
.update-card:hover { transform: translateY(-3px); border-color: var(--border-strong); }

.update-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.update-version-badge {
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  white-space: nowrap;
}
.update-card h3 { font-size: 19px; }
.update-card .desc { color: var(--text-secondary); font-size: 14.5px; }
.update-meta { display: flex; gap: 14px; font-size: 13px; color: var(--text-muted); }

.update-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
}
.empty-state h3 { color: var(--text-secondary); margin-bottom: 8px; font-size: 18px; }

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

.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13.5px; font-weight: 600; color: var(--text-secondary); margin-bottom: 8px; }

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 14.5px;
  font-family: inherit;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--border-strong);
  background: var(--bg-card);
}
.form-textarea { resize: vertical; min-height: 100px; }

.form-error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 6px;
}

.form-hint { color: var(--text-muted); font-size: 12.5px; margin-top: 6px; }

.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 20px;
  border: 1px solid;
}
.alert-error { background: rgba(248, 113, 113, 0.08); border-color: rgba(248, 113, 113, 0.25); color: var(--danger); }
.alert-success { background: rgba(74, 222, 128, 0.08); border-color: rgba(74, 222, 128, 0.25); color: var(--success); }

/* -------------------------------- Auth pages -------------------------------- */

.auth-shell {
  min-height: calc(100vh - 200px);
  display: grid;
  place-items: center;
  padding: 60px 24px;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-md);
  animation: fadeUp 0.5s var(--ease) forwards;
}

.auth-icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  margin: 0 auto 20px;
}

.auth-card h1 { font-size: 22px; text-align: center; margin-bottom: 10px; }
.auth-card .sub { color: var(--text-secondary); font-size: 14.5px; text-align: center; margin-bottom: 28px; }

/* -------------------------------- Toasts -------------------------------- */

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 360px;
}

.toast {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  transform: translateX(120%);
  opacity: 0;
  transition: transform 0.35s var(--ease), opacity 0.35s var(--ease);
}
.toast.show { transform: translateX(0); opacity: 1; }
.toast.hide { transform: translateX(120%); opacity: 0; }
.toast-dot { width: 8px; height: 8px; border-radius: 50%; margin-top: 5px; flex-shrink: 0; }
.toast-success .toast-dot { background: var(--success); }
.toast-error .toast-dot { background: var(--danger); }
.toast-info .toast-dot { background: var(--text-secondary); }
.toast-title { font-weight: 600; margin-bottom: 2px; }
.toast-body { color: var(--text-secondary); font-size: 13px; }

/* -------------------------------- Account -------------------------------- */

.account-shell { max-width: 640px; margin: 0 auto; padding: 60px 24px; }
.account-header { display: flex; align-items: center; gap: 18px; margin-bottom: 36px; }
.account-avatar { width: 72px; height: 72px; border-radius: 50%; border: 2px solid var(--border-strong); }
.account-name { font-size: 22px; margin-bottom: 4px; }
.account-username { color: var(--text-muted); font-size: 14px; }

.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 32px; }
.info-item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; }
.info-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 6px; }
.info-value { font-size: 14.5px; font-weight: 500; }

.badge { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: 12.5px; font-weight: 600; }
.badge-verified { background: rgba(74, 222, 128, 0.1); color: var(--success); }
.badge-disabled { background: rgba(248, 113, 113, 0.1); color: var(--danger); }

/* -------------------------------- Admin -------------------------------- */

.admin-shell { display: flex; min-height: calc(100vh - 64px); }

.admin-sidebar {
  width: 240px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  padding: 28px 16px;
  background: var(--bg-elevated);
}
.admin-sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 2px;
  transition: background 0.15s var(--ease), color 0.15s var(--ease);
}
.admin-sidebar-link:hover { background: var(--bg-hover); color: var(--text-primary); }
.admin-sidebar-link.active { background: var(--bg-hover); color: var(--text-primary); }

.admin-main { flex: 1; padding: 36px 40px; max-width: 1000px; }
.admin-page-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 28px; flex-wrap: wrap; gap: 12px; }
.admin-page-header h1 { font-size: 24px; }

.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 36px; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-md); padding: 22px; }
.stat-value { font-size: 30px; font-weight: 700; margin-bottom: 4px; }
.stat-label { color: var(--text-muted); font-size: 13px; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-md); background: var(--bg-card); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; padding: 14px 18px; color: var(--text-muted); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; border-bottom: 1px solid var(--border); }
td { padding: 14px 18px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:last-child td { border-bottom: none; }
.table-actions { display: flex; gap: 8px; }

.status-pill { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.status-published { background: rgba(74, 222, 128, 0.1); color: var(--success); }
.status-draft { background: rgba(161, 161, 170, 0.12); color: var(--text-secondary); }

/* -------------------------------- Details page -------------------------------- */

.details-shell { max-width: 720px; margin: 0 auto; padding: 60px 24px; }
.details-header { margin-bottom: 32px; }
.details-header .update-version-badge { margin-bottom: 16px; }
.details-header h1 { font-size: clamp(28px, 5vw, 40px); margin-bottom: 12px; }
.details-meta { display: flex; gap: 18px; color: var(--text-muted); font-size: 13.5px; flex-wrap: wrap; }
.details-section { margin-bottom: 32px; }
.details-section h2 { font-size: 15px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); margin-bottom: 14px; }
.details-section p { color: var(--text-secondary); font-size: 15.5px; line-height: 1.7; }
.change-list { display: flex; flex-direction: column; gap: 10px; }
.change-item { display: flex; gap: 10px; align-items: flex-start; color: var(--text-secondary); font-size: 15px; }
.change-item::before { content: ''; width: 6px; height: 6px; border-radius: 50%; background: var(--accent-dim); margin-top: 8px; flex-shrink: 0; }

/* -------------------------------- Footer -------------------------------- */

.site-footer { border-top: 1px solid var(--border); padding: 36px 24px; }
.footer-inner { max-width: var(--container); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 14px; }
.footer-copy { color: var(--text-muted); font-size: 13.5px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-muted); font-size: 13.5px; transition: color 0.15s var(--ease); }
.footer-links a:hover { color: var(--text-primary); }

/* -------------------------------- Error pages -------------------------------- */

.error-shell { min-height: calc(100vh - 200px); display: grid; place-items: center; padding: 60px 24px; text-align: center; }
.error-code { font-size: 90px; font-weight: 800; color: var(--border-strong); line-height: 1; margin-bottom: 12px; }
.error-shell h1 { font-size: 24px; margin-bottom: 10px; }
.error-shell p { color: var(--text-secondary); max-width: 420px; margin: 0 auto 28px; }

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

@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid { grid-template-columns: 1fr; }
  .admin-main { padding: 28px 20px; }
  .admin-sidebar { width: 200px; }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    gap: 2px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-user span { display: none; }
  .grid { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr; }
  .admin-shell { flex-direction: column; }
  .admin-sidebar { width: 100%; display: flex; overflow-x: auto; gap: 4px; padding: 12px; border-right: none; border-bottom: 1px solid var(--border); }
  .admin-sidebar-link { white-space: nowrap; }
  .hero { padding: 90px 20px 70px; }
  .toast-container { left: 16px; right: 16px; max-width: none; }
}