/* ═══ KeysMao Design v3 ═══ */
:root {
  --bg: #08080c;
  --bg2: #0e0e15;
  --surface: #14141d;
  --surface2: #1a1a25;
  --border: #222233;
  --text: #e2e2ed;
  --muted: #6b6b80;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99,102,241,0.2);
  --danger: #ef4444;
  --danger-hover: #f87171;
  --success: #22c55e;
  --radius: 12px;
  --radius-sm: 8px;
  --sidebar-w: 220px;
  --topbar-h: 52px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--accent-hover); }

/* ═══ Animations ═══ */
@keyframes fadeUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideDown { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.card, .page-header, .hero, .features { animation: fadeUp 0.4s ease; }
.card:nth-child(2) { animation-delay: 0.05s; }
.card:nth-child(3) { animation-delay: 0.1s; }
.msg-error, .msg-success { animation: slideDown 0.25s ease; }

/* ═══ Scrollbar ═══ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); }

/* ═══ Topbar ═══ */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--topbar-h); z-index: 100;
  background: rgba(14,14,21,0.88); backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; padding: 0 20px; gap: 14px;
}
.topbar .logo { font-size: 19px; font-weight: 800; color: var(--text); letter-spacing: -0.5px; }
.topbar .logo span { color: var(--accent); }

/* ═══ Hamburger ═══ */
.hamburger { display: flex; flex-direction: column; gap: 4px; cursor: pointer; background: none; border: none; padding: 6px; border-radius: var(--radius-sm); transition: background 0.15s; }
.hamburger:hover { background: var(--surface); }
.hamburger span { display: block; width: 20px; height: 2px; background: var(--text); border-radius: 1px; }

/* ═══ User Dropdown ═══ */
.user-dropdown { position: relative; margin-left: auto; cursor: pointer; }
.user-dropdown .trigger {
  display: flex; align-items: center; gap: 8px; padding: 5px 12px;
  border-radius: var(--radius-sm); color: var(--muted); font-size: 13px; font-weight: 500;
  border: 1px solid transparent; transition: all 0.15s;
}
.user-dropdown .trigger:hover { color: var(--text); border-color: var(--border); background: var(--surface); }
.user-dropdown .trigger .avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: #fff;
}
.user-dropdown .menu {
  display: none; position: absolute; right: 0; top: calc(100% + 6px);
  background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius);
  min-width: 160px; z-index: 200; overflow: hidden;
  box-shadow: 0 12px 40px rgba(0,0,0,0.5); animation: slideDown 0.15s ease;
}
.user-dropdown .menu a { display: block; padding: 11px 16px; color: var(--text); font-size: 13px; transition: all 0.12s; }
.user-dropdown .menu a:hover { background: var(--accent); color: #fff; }
.user-dropdown.open .menu { display: block; }

/* ═══ Sidebar ═══ */
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.55); z-index: 98; }
.sidebar-overlay.show { display: block; animation: fadeIn 0.15s ease; }
.sidebar {
  position: fixed; top: var(--topbar-h); left: calc(-1 * var(--sidebar-w)); bottom: 0;
  width: var(--sidebar-w); background: var(--bg2); border-right: 1px solid var(--border);
  z-index: 99; overflow-y: auto; padding: 8px 0;
  transition: left 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.sidebar.open { left: 0; }
.sidebar a {
  display: flex; align-items: center; gap: 8px; padding: 9px 20px;
  color: var(--muted); font-size: 13px; font-weight: 500;
  border-left: 3px solid transparent; transition: all 0.12s;
}
.sidebar a:hover { color: var(--text); background: rgba(255,255,255,0.02); }
.sidebar a.active { color: var(--accent); background: rgba(99,102,241,0.06); border-left-color: var(--accent); }
.sidebar .nav-section { padding: 18px 20px 8px; font-size: 10px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: 1.5px; }
.sidebar .nav-bottom { margin-top: auto; border-top: 1px solid var(--border); padding-top: 8px; }

/* ═══ Main ═══ */
.main { margin-left: 0; padding: calc(var(--topbar-h) + 20px) 24px 48px; min-height: 100vh; }
.container { max-width: 1080px; margin: 0 auto; }

/* ═══ Cards ═══ */
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px 28px; margin-bottom: 20px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.card:hover { border-color: rgba(99,102,241,0.25); }
.card h2 { font-size: 19px; font-weight: 700; margin-bottom: 4px; }
.card .subtitle { color: var(--muted); font-size: 13px; margin-bottom: 20px; }

/* ═══ Form ═══ */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block; font-size: 11px; font-weight: 700; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.8px; margin-bottom: 6px;
}
.form-group input, .form-group textarea {
  width: 100%; padding: 10px 14px; background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text); font-size: 14px;
  font-family: inherit; transition: all 0.15s;
}
.form-group input:hover, .form-group textarea:hover { border-color: #333345; }
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group textarea { resize: vertical; min-height: 120px; font-family: 'JetBrains Mono', 'SF Mono', 'Consolas', 'Monaco', monospace; font-size: 13px; line-height: 1.6; tab-size: 2; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }

/* ═══ File Upload ═══ */
.file-drop {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 28px;
  text-align: center; cursor: pointer; transition: all 0.2s; position: relative;
}
.file-drop:hover, .file-drop.drag-over { border-color: var(--accent); background: rgba(99,102,241,0.04); }
.file-drop.has-file { border-color: var(--success); border-style: solid; }
.file-drop input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.file-drop .icon { font-size: 28px; margin-bottom: 8px; opacity: 0.6; }
.file-drop .text { color: var(--muted); font-size: 13px; }
.file-drop .text strong { color: var(--accent); }
.file-drop .filename { color: var(--success); font-size: 13px; margin-top: 4px; }

/* ═══ Buttons ═══ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 18px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 600;
  border: none; cursor: pointer; transition: all 0.15s; font-family: inherit;
  position: relative; overflow: hidden;
}
.btn::after {
  content: ''; position: absolute; inset: 0;
  background: rgba(255,255,255,0); transition: background 0.15s;
}
.btn:hover::after { background: rgba(255,255,255,0.06); }
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { box-shadow: 0 4px 20px var(--accent-glow); }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }
.btn-block { width: 100%; }
.btn-icon { padding: 8px; border-radius: var(--radius-sm); background: var(--surface2); border: 1px solid var(--border); color: var(--muted); cursor: pointer; transition: all 0.15s; }
.btn-icon:hover { border-color: var(--accent); color: var(--accent); }

/* ═══ Table ═══ */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
table th, table td { padding: 11px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
table th { color: var(--muted); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px; background: var(--bg2); }
table tbody tr { transition: background 0.12s; }
table tbody tr:hover td { background: rgba(99,102,241,0.03); }
table td code { background: var(--bg); padding: 3px 8px; border-radius: 4px; font-size: 12px; color: var(--accent); font-family: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace; }
table td form { display: inline; margin: 0 2px; }

/* ═══ Messages ═══ */
.msg-error, .msg-success {
  padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 13px; font-weight: 500;
}
.msg-error { background: rgba(239,68,68,0.08); color: #f87171; border: 1px solid rgba(239,68,68,0.15); }
.msg-success { background: rgba(34,197,94,0.08); color: #4ade80; border: 1px solid rgba(34,197,94,0.15); }

/* ═══ Badges ═══ */
.badge { display: inline-flex; align-items: center; padding: 2px 10px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.badge-success { background: rgba(34,197,94,0.1); color: var(--success); }
.badge-danger { background: rgba(239,68,68,0.1); color: var(--danger); }
.badge-muted { background: rgba(107,107,128,0.1); color: var(--muted); }

/* ═══ Page Header ═══ */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; flex-wrap: wrap; gap: 12px; }
.page-header h2 { font-size: 22px; font-weight: 700; }

/* ═══ Empty ═══ */
.empty { text-align: center; padding: 48px 20px; color: var(--muted); }
.empty p { margin-bottom: 16px; font-size: 14px; }

/* ═══ Copy Field ═══ */
.copy-field {
  display: flex; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden;
}
.copy-field input { flex: 1; border: none !important; background: transparent !important; padding: 8px 12px; color: var(--text); font-size: 12px; font-family: 'JetBrains Mono', 'SF Mono', 'Consolas', monospace; }
.copy-field input:focus { outline: none; box-shadow: none !important; }
.copy-field button { border: none; background: var(--accent); color: #fff; padding: 8px 16px; cursor: pointer; font-size: 11px; font-weight: 600; transition: background 0.15s; white-space: nowrap; }
.copy-field button:hover { background: var(--accent-hover); }

/* ═══ Checkbox ═══ */
.checkbox-wrap { display: flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; }
.checkbox-wrap input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }
.checkbox-wrap label { cursor: pointer; font-size: 13px; color: var(--muted); }

/* ═══ Hero ═══ */
.hero { text-align: center; padding: 48px 20px; }
.hero h1 { font-size: 40px; font-weight: 800; margin-bottom: 10px; letter-spacing: -1px; line-height: 1.2; }
.hero h1 span { background: linear-gradient(135deg, var(--accent), #a855f7); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { color: var(--muted); font-size: 15px; max-width: 480px; margin: 0 auto 24px; }
.hero .btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ═══ Features ═══ */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; max-width: 900px; margin: 0 auto; }
.feature-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; transition: all 0.2s;
}
.feature-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.3); }
.feature-card h3 { font-size: 15px; margin-bottom: 6px; color: var(--text); }
.feature-card p { color: var(--muted); font-size: 13px; line-height: 1.6; }

/* ═══ Responsive ═══ */
@media (min-width: 768px) {
  .hamburger { display: none; }
  .sidebar { left: 0; }
  .sidebar-overlay { display: none !important; }
  .main { margin-left: var(--sidebar-w); }
  .topbar { left: var(--sidebar-w); }
}