@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --bg-primary: #0f1117;
  --bg-secondary: #1a1d29;
  --bg-card: rgba(26, 29, 41, 0.8);
  --bg-glass: rgba(255,255,255,0.04);
  --border: rgba(255,255,255,0.08);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent2: #8b5cf6;
  --gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --transition: all 0.25s cubic-bezier(.4,0,.2,1);
  --sidebar-w: 260px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; }

/* ==================== LAYOUT ==================== */
.app-layout { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  position: fixed; top: 0; left: 0; bottom: 0;
  display: flex; flex-direction: column;
  z-index: 100;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-logo {
  font-size: 1.4rem; font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  display: flex; align-items: center; gap: 10px;
}

.sidebar-logo svg { width: 28px; height: 28px; }

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }

.nav-section { margin-bottom: 24px; }
.nav-section-title {
  font-size: 0.7rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--text-muted); padding: 0 12px; margin-bottom: 8px;
}

.nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
  transition: var(--transition); margin-bottom: 2px;
}
.nav-item:hover { background: var(--bg-glass); color: var(--text-primary); }
.nav-item.active {
  background: rgba(59,130,246,0.12); color: var(--accent);
}
.nav-item svg { width: 20px; height: 20px; flex-shrink: 0; }

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--border);
}

.main-content {
  flex: 1; margin-left: var(--sidebar-w);
  min-height: 100vh;
}

.topbar {
  height: 64px; padding: 0 32px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: rgba(15,17,23,0.8);
  backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 50;
}

.topbar-title { font-size: 1.1rem; font-weight: 600; }

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

.page-content { padding: 32px; max-width: 1400px; }

.mobile-toggle {
  display: none; background: none; border: none;
  color: var(--text-primary); cursor: pointer; padding: 8px;
}

/* ==================== CARDS ==================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  transition: var(--transition);
}
.card:hover { border-color: rgba(255,255,255,0.12); }
.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
}
.card-header h3 { font-size: 1rem; font-weight: 600; }
.card-body { padding: 24px; }

/* ==================== STAT CARDS ==================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px; margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(12px);
  transition: var(--transition);
  position: relative; overflow: hidden;
}
.stat-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient); opacity: 0; transition: var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.stat-card:hover::before { opacity: 1; }

.stat-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px; font-size: 1.2rem;
}
.stat-icon.blue { background: rgba(59,130,246,0.15); color: var(--accent); }
.stat-icon.purple { background: rgba(139,92,246,0.15); color: var(--accent2); }
.stat-icon.green { background: rgba(16,185,129,0.15); color: var(--success); }
.stat-icon.yellow { background: rgba(245,158,11,0.15); color: var(--warning); }

.stat-value { font-size: 1.8rem; font-weight: 700; margin-bottom: 4px; }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); }

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-family: inherit; font-size: 0.875rem; font-weight: 600;
  border: none; cursor: pointer;
  transition: var(--transition); text-decoration: none;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gradient); color: #fff;
  box-shadow: 0 2px 12px rgba(59,130,246,0.3);
}
.btn-primary:hover { box-shadow: 0 4px 20px rgba(59,130,246,0.5); color: #fff; }

.btn-secondary {
  background: var(--bg-glass); color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: rgba(255,255,255,0.08); color: #fff; }

.btn-danger { background: rgba(239,68,68,0.15); color: var(--danger); }
.btn-danger:hover { background: rgba(239,68,68,0.25); }

.btn-success { background: rgba(16,185,129,0.15); color: var(--success); }
.btn-success:hover { background: rgba(16,185,129,0.25); }

.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-icon { padding: 8px; border-radius: var(--radius-sm); }

/* ==================== FORMS ==================== */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block; font-size: 0.85rem; font-weight: 500;
  color: var(--text-secondary); margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
  width: 100%; padding: 10px 14px;
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: inherit; font-size: 0.9rem;
  transition: var(--transition); outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}
.form-input::placeholder { color: var(--text-muted); }
.form-textarea { min-height: 100px; resize: vertical; }
.form-select { cursor: pointer; }
.form-select option { background: var(--bg-secondary); }
.form-hint { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-error { color: var(--danger); font-size: 0.8rem; margin-top: 4px; }

/* ==================== TABLE ==================== */
.table-wrapper { overflow-x: auto; }

.table {
  width: 100%; border-collapse: collapse;
  font-size: 0.875rem;
}
.table th {
  text-align: left; padding: 12px 16px;
  font-weight: 600; font-size: 0.78rem;
  text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
.table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}
.table tr:hover td { background: var(--bg-glass); }
.table .url-cell {
  max-width: 300px; overflow: hidden;
  text-overflow: ellipsis; white-space: nowrap;
}

/* ==================== BADGES ==================== */
.badge {
  display: inline-flex; align-items: center;
  padding: 3px 10px; border-radius: 20px;
  font-size: 0.72rem; font-weight: 600;
}
.badge-active { background: rgba(16,185,129,0.15); color: var(--success); }
.badge-inactive { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge-tag {
  background: rgba(139,92,246,0.15); color: var(--accent2);
  margin-right: 4px; margin-bottom: 4px;
}

/* ==================== ALERTS ==================== */
.alert {
  padding: 14px 18px; border-radius: var(--radius-sm);
  margin-bottom: 20px; font-size: 0.875rem;
  display: flex; align-items: center; gap: 10px;
}
.alert-error { background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.2); color: #fca5a5; }
.alert-success { background: rgba(16,185,129,0.1); border: 1px solid rgba(16,185,129,0.2); color: #6ee7b7; }
.alert-warning { background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.2); color: #fcd34d; }

/* ==================== PAGINATION ==================== */
.pagination {
  display: flex; align-items: center; gap: 4px;
  justify-content: center; margin-top: 24px;
}
.page-btn {
  padding: 8px 14px; border-radius: var(--radius-sm);
  background: var(--bg-glass); border: 1px solid var(--border);
  color: var(--text-secondary); font-size: 0.85rem;
  cursor: pointer; transition: var(--transition);
}
.page-btn:hover { background: rgba(255,255,255,0.08); }
.page-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.page-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ==================== TOAST ==================== */
.toast-container { position: fixed; top: 24px; right: 24px; z-index: 9999; }
.toast {
  padding: 14px 20px; border-radius: var(--radius-sm);
  margin-bottom: 8px; font-size: 0.875rem; font-weight: 500;
  background: var(--bg-secondary); border: 1px solid var(--border);
  color: var(--text-primary);
  box-shadow: var(--shadow);
  animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
  display: flex; align-items: center; gap: 10px;
}
.toast-success { border-left: 3px solid var(--success); }
.toast-error { border-left: 3px solid var(--danger); }

@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes fadeOut { to { opacity: 0; transform: translateX(100%); } }

/* ==================== LANDING PAGE ==================== */
.landing { min-height: 100vh; }

.landing-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 40px; max-width: 1200px; margin: 0 auto;
}
.landing-nav-logo { font-size: 1.4rem; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.landing-nav-links { display: flex; gap: 20px; align-items: center; }

.hero {
  text-align: center; padding: 80px 24px 60px;
  max-width: 800px; margin: 0 auto;
  position: relative;
}
.hero::before {
  content: ''; position: absolute;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(59,130,246,0.12), transparent 70%);
  top: -100px; left: 50%; transform: translateX(-50%);
  pointer-events: none;
}
.hero h1 {
  font-size: 3.5rem; font-weight: 800; line-height: 1.15;
  margin-bottom: 20px; position: relative;
}
.hero h1 span { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 1.15rem; color: var(--text-secondary); max-width: 560px; margin: 0 auto 40px; line-height: 1.7; }

.hero-shortener {
  max-width: 600px; margin: 0 auto 40px;
  position: relative;
}
.hero-shortener .form-input {
  padding: 16px 150px 16px 20px;
  font-size: 1rem; border-radius: 14px;
  background: var(--bg-secondary); border: 1px solid var(--border);
}
.hero-shortener .btn {
  position: absolute; right: 6px; top: 6px; bottom: 6px;
  border-radius: 10px; padding: 0 24px;
}

.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px; max-width: 1100px; margin: 0 auto;
  padding: 40px 24px 80px;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
  backdrop-filter: blur(12px); transition: var(--transition);
}
.feature-card:hover { transform: translateY(-4px); border-color: rgba(59,130,246,0.3); box-shadow: 0 8px 32px rgba(0,0,0,0.3); }
.feature-icon {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px; font-size: 1.3rem;
  background: rgba(59,130,246,0.12); color: var(--accent);
}
.feature-card h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.feature-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.6; }

/* ==================== AUTH PAGES ==================== */
.auth-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px; position: relative;
}
.auth-page::before {
  content: ''; position: absolute; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(139,92,246,0.1), transparent 70%);
  top: 10%; left: 30%; pointer-events: none;
}
.auth-card {
  width: 100%; max-width: 440px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px;
  backdrop-filter: blur(16px); position: relative;
}
.auth-card h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; text-align: center; }
.auth-card .subtitle { text-align: center; color: var(--text-secondary); margin-bottom: 32px; font-size: 0.9rem; }
.auth-footer { text-align: center; margin-top: 24px; font-size: 0.875rem; color: var(--text-secondary); }

/* ==================== LINK DETAIL ==================== */
.link-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 20px; margin-bottom: 32px; flex-wrap: wrap;
}
.link-info h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.link-urls { display: flex; flex-direction: column; gap: 6px; }
.link-short {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 1rem; color: var(--accent); font-weight: 600;
}
.link-original { font-size: 0.85rem; color: var(--text-muted); max-width: 500px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.link-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.qr-container {
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.qr-container img { border-radius: var(--radius-sm); }

.chart-container {
  position: relative; height: 300px; padding: 20px 0;
}

.analytics-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px; margin-top: 24px;
}

.stat-bar { margin-bottom: 12px; }
.stat-bar-header { display: flex; justify-content: space-between; margin-bottom: 4px; font-size: 0.82rem; }
.stat-bar-track { height: 6px; background: var(--bg-glass); border-radius: 3px; overflow: hidden; }
.stat-bar-fill { height: 100%; background: var(--gradient); border-radius: 3px; transition: width 0.6s ease; }

/* ==================== ERROR PAGE ==================== */
.error-page {
  min-height: 80vh; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 40px;
}
.error-page h1 { font-size: 4rem; font-weight: 800; background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 16px; }
.error-page p { color: var(--text-secondary); font-size: 1.1rem; margin-bottom: 32px; }

/* ==================== PASSWORD GATE ==================== */
.gate-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.gate-card {
  max-width: 400px; width: 100%; text-align: center;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px;
  backdrop-filter: blur(16px);
}
.gate-card .lock-icon { font-size: 3rem; margin-bottom: 20px; }
.gate-card h2 { font-size: 1.3rem; margin-bottom: 8px; }
.gate-card p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 24px; }

/* ==================== SEARCH ==================== */
.search-bar {
  display: flex; gap: 8px; margin-bottom: 24px;
}
.search-bar .form-input { flex: 1; }

/* ==================== COPY TOOLTIP ==================== */
.copy-btn { position: relative; cursor: pointer; }
.copy-btn .tooltip {
  position: absolute; bottom: 100%; left: 50%; transform: translateX(-50%);
  padding: 4px 10px; background: var(--success); color: #fff;
  border-radius: 4px; font-size: 0.72rem; white-space: nowrap;
  opacity: 0; transition: var(--transition); pointer-events: none;
}
.copy-btn.copied .tooltip { opacity: 1; transform: translateX(-50%) translateY(-4px); }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .mobile-toggle { display: block; }
  .page-content { padding: 20px; }
  .topbar { padding: 0 16px; }
  .hero h1 { font-size: 2.2rem; }
  .hero-shortener .form-input { padding-right: 20px; }
  .hero-shortener .btn { position: static; width: 100%; margin-top: 12px; justify-content: center; }
  .hero-shortener { display: flex; flex-direction: column; }
  .form-row { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .link-header { flex-direction: column; }
  .landing-nav { padding: 16px 20px; }
  .features-grid { grid-template-columns: 1fr; }
  .auth-card { padding: 28px 20px; }
}

@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.8rem; }
}

/* ==================== LOADING SPINNER ==================== */
.spinner { width: 24px; height: 24px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ==================== OVERLAY ==================== */
.sidebar-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.5); z-index: 99;
}
.sidebar-overlay.active { display: block; }

/* ==================== MISC ==================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.justify-between { justify-content: space-between; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }