@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:ital,wght@0,400;0,500;0,700;1,400&display=swap');

:root {
  /* Dynamic Palette */
  --bg-main: #090d16;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #1e293b;
  --bg-glass: rgba(15, 23, 42, 0.75);
  --bg-glass-card: rgba(30, 41, 59, 0.6);

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(245, 158, 11, 0.4);
  --border-glow: rgba(56, 189, 248, 0.3);

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --color-primary: #38bdf8;
  --color-primary-dark: #0284c7;
  --color-accent: #f59e0b;
  --color-python-yellow: #ffd343;
  --color-python-blue: #3776ab;

  --gradient-primary: linear-gradient(135deg, #38bdf8 0%, #2563eb 100%);
  --gradient-accent: linear-gradient(135deg, #ffd343 0%, #f59e0b 100%);
  --gradient-dark: linear-gradient(180deg, #090d16 0%, #0f172a 100%);
  --gradient-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.15), transparent 70%);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-glow: 0 0 30px -5px rgba(245, 158, 11, 0.2);
  --shadow-card: 0 10px 30px -10px rgba(0, 0, 0, 0.5);

  --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  background-image: var(--gradient-glow);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Glassmorphism utility */
.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.glass-card {
  background: var(--bg-glass-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 13, 22, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 1rem 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-weight: 800;
  font-size: 1.35rem;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #090d16;
  font-weight: 900;
  font-size: 1.1rem;
  box-shadow: 0 0 15px rgba(255, 211, 67, 0.4);
}

.python-badge {
  background: rgba(55, 118, 171, 0.25);
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: var(--color-primary);
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  gap: 1.75rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.nav-links a:hover {
  color: var(--text-main);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.7rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
}

.btn-accent {
  background: var(--gradient-accent);
  color: #090d16;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.5);
  color: #000000;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.5);
  color: #ffffff;
}

.btn-glass {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-main);
  backdrop-filter: blur(10px);
}

.btn-glass:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

/* Hero Section */
.hero {
  padding: 6rem 2rem 4rem;
  text-align: center;
  position: relative;
  max-width: 1100px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 211, 67, 0.1);
  border: 1px solid rgba(255, 211, 67, 0.3);
  color: var(--color-python-yellow);
  padding: 0.35rem 1rem;
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 2rem;
  animation: pulse 3s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.hero h1 {
  font-size: 3.75rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 1.5rem;
}

.hero h1 .gradient-text {
  background: linear-gradient(135deg, #ffffff 0%, var(--color-python-yellow) 50%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.3rem;
  color: var(--text-muted);
  max-width: 750px;
  margin: 0 auto 3rem;
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

/* Code Preview Terminal Window */
.terminal-window {
  background: #090d16;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 40px rgba(56, 189, 248, 0.15);
  overflow: hidden;
  text-align: left;
  margin: 4rem auto 2rem;
  max-width: 850px;
}

.terminal-header {
  background: rgba(255, 255, 255, 0.03);
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.terminal-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.terminal-title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.terminal-body {
  padding: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.7;
  color: #e2e8f0;
}

.code-keyword { color: #f472b6; font-weight: 600; }
.code-func { color: #38bdf8; }
.code-num { color: #f59e0b; }
.code-str { color: #34d399; }
.code-comment { color: var(--text-dim); font-style: italic; }

/* Grid Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

/* Feature & Topic Cards */
.feature-card {
  padding: 2.25rem;
  position: relative;
  overflow: hidden;
}

.feature-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Auth Forms Container */
.auth-container {
  max-width: 460px;
  margin: 4rem auto;
  padding: 3rem 2.5rem;
  position: relative;
}

.auth-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.auth-header h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.form-control {
  width: 100%;
  padding: 0.85rem 1.15rem;
  font-size: 1rem;
  font-family: var(--font-sans);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: rgba(15, 23, 42, 0.6);
  color: var(--text-main);
  transition: all 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-primary);
  background: rgba(15, 23, 42, 0.9);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.15);
}

/* Dashboard Sidebar Layout */
.dashboard-layout {
  display: flex;
  min-height: calc(100vh - 75px);
}

.sidebar {
  width: 280px;
  background: rgba(9, 13, 22, 0.9);
  border-right: 1px solid var(--border-subtle);
  padding: 2.5rem 1.25rem;
  flex-shrink: 0;
}

.sidebar-menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.sidebar-menu a {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1.15rem;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--color-primary);
}

.dashboard-content {
  flex-grow: 1;
  padding: 3rem;
}

/* Alerts */
.alert {
  padding: 1.15rem 1.5rem;
  border-radius: var(--radius-md);
  margin-bottom: 2rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-success {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
}

.alert-error {
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #f87171;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 3rem 2rem;
  text-align: center;
  background: rgba(9, 13, 22, 0.95);
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: auto;
}

/* Responsive */
@media (max-width: 900px) {
  .hero h1 { font-size: 2.75rem; }
  .dashboard-layout { flex-direction: column; }
  .sidebar { width: 100%; }
}