/* Speedtest Monitor - Design System */
:root {
  --bg: #0a0e1a;
  --bg2: #111827;
  --card: #1a1f35;
  --card-hover: #1e2540;
  --border: #2a3050;
  --border-light: #3a4060;
  --txt: #e8ecf4;
  --txt-secondary: #8892a8;
  --muted: #6b7394;
  --accent: #3b82f6;
  --accent-glow: rgba(59, 130, 246, 0.3);
  --accent2: #8b5cf6;
  --accent2-glow: rgba(139, 92, 246, 0.2);
  --ok: #10b981;
  --ok-glow: rgba(16, 185, 129, 0.2);
  --err: #ef4444;
  --warn: #f59e0b;
  --gradient-1: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
  --gradient-2: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
  --gradient-3: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
  --radius: 12px;
  --radius-lg: 16px;
  --transition: all 0.2s ease;
}

.theme-light {
  --bg: #f0f2f5;
  --bg2: #ffffff;
  --card: #ffffff;
  --card-hover: #f8f9fb;
  --border: #e2e5ea;
  --border-light: #d0d4dc;
  --txt: #1a1f35;
  --txt-secondary: #4a5568;
  --muted: #718096;
  --accent: #2563eb;
  --accent-glow: rgba(37, 99, 235, 0.15);
  --accent2: #7c3aed;
  --ok: #059669;
  --err: #dc2626;
  --warn: #d97706;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--txt);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  line-height: 1.5;
}

/* Header */
.app-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

.app-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
}

.app-header h1 {
  font-size: 20px;
  font-weight: 700;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.3px;
}

/* Navigation */
nav { display: flex; gap: 6px; }

nav button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--txt-secondary);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: var(--transition);
}

nav button:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--accent-glow);
}

.theme-btn {
  background: transparent;
  border: 1px solid var(--border);
  font-size: 18px;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  transition: var(--transition);
}

.theme-btn:hover { background: var(--card); }

/* Login */
.login-box {
  position: fixed;
  inset: 0;
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.login-box.hidden { display: none; }

#loginForm {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--card);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  width: 320px;
  box-shadow: var(--shadow-lg);
}

#loginForm h2 {
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#loginForm input {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--txt);
  font-size: 14px;
  transition: var(--transition);
}

#loginForm input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

#loginForm button {
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: var(--gradient-1);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

#loginForm button:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

/* Container */
.container {
  padding: 24px 24px 80px;
  max-width: 1200px;
  margin: 0 auto;
}

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.card:hover { box-shadow: var(--shadow); }

.card h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--txt);
}

.muted { color: var(--muted); font-size: 13px; }

/* Stat Cards */
.grid.gap { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.grid { display: grid; gap: 16px; }

.statcard {
  text-align: center;
  padding: 24px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--card);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.statcard::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-1);
}

.statcard:hover {
  border-color: var(--accent);
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-2px);
}

.statcard h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 4px;
}

.statcard p {
  color: var(--txt-secondary);
  font-size: 13px;
  margin-bottom: 8px;
}

.statcard .big {
  font-size: 42px;
  font-weight: 800;
  background: var(--gradient-1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 12px 0;
  line-height: 1;
}

.statcard span {
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.statcard button {
  margin-top: 16px;
  padding: 10px 20px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: transparent;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.statcard button:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 16px var(--accent-glow);
}

/* Table */
.tbl {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 14px;
}

.tbl th {
  background: var(--bg);
  color: var(--txt-secondary);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.tbl td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.tbl tr:hover td { background: var(--card-hover); }

.tbl button {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--txt-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
  margin-right: 4px;
}

.tbl button:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Forms */
input[type="number"],
input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--txt);
  font-size: 14px;
  transition: var(--transition);
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--txt-secondary);
  margin-bottom: 12px;
}

/* Buttons */
.primary,
.danger {
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}

.primary {
  background: var(--gradient-1);
  color: #fff;
}

.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.danger {
  background: var(--err);
  color: #fff;
}

.danger:hover {
  box-shadow: 0 4px 16px rgba(239, 68, 68, 0.3);
}

/* Skeleton */
.skeleton-loader {
  background: var(--card);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  color: var(--muted);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hidden { display: none !important; }

pre {
  white-space: pre-wrap;
  font-size: 12px;
  background: var(--bg);
  padding: 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow-x: auto;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}

.error { color: var(--err); }

canvas { max-width: 100%; height: auto; }

/* Responsive */
@media (max-width: 768px) {
  .app-header .container { padding: 12px 16px; }
  .container { padding: 16px 16px 60px; }
  .grid.gap { grid-template-columns: 1fr; }
  .statcard .big { font-size: 32px; }
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-light); }