/* ==================== CSS Variables ==================== */
:root {
  --color-primary: #4f46e5;
  --color-primary-light: #818cf8;
  --color-primary-dark: #3730a3;
  --color-accent: #f472b6;
  
  --color-bg: #f8fafc;
  --color-bg-card: #ffffff;
  --color-bg-secondary: #f1f5f9;
  
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  
  --color-border: #e2e8f0;
  --color-success: #10b981;
  --color-error: #ef4444;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 15px rgba(79, 70, 229, 0.3);
}

/* ==================== Reset & Base ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a:hover {
  color: var(--color-primary-dark);
}

/* ==================== Glass Effect ==================== */
.glass {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ==================== Layout ==================== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ==================== Header ==================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  padding: var(--spacing-lg) 0;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  color: var(--color-text);
  transition: var(--transition);
}

.logo-section:hover {
  opacity: 0.8;
}

.logo-image {
  height: 40px;
  width: auto;
  animation: float 3s ease-in-out infinite;
}

.logo-section h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  letter-spacing: -0.02em;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-5px);
  }
}

/* ==================== Navigation ==================== */
.nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition);
  text-decoration: none;
}

.btn-login {
  background: var(--color-primary);
  color: white;
  border: none;
  cursor: pointer;
}

.btn-login:hover {
  background: var(--color-primary-dark);
  color: white;
}

.btn-logout {
  background: var(--color-error);
  color: white;
  border: none;
  cursor: pointer;
}

.btn-logout:hover {
  background: #dc2626;
  color: white;
}

.user-welcome {
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ==================== Main Content ==================== */
.main {
  flex: 1;
  padding: var(--spacing-2xl) 0;
}

/* ==================== Hero Section ==================== */
.hero {
  margin-bottom: var(--spacing-2xl);
  position: relative;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: white;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h2 {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.125rem;
  opacity: 0.95;
  max-width: 600px;
  line-height: 1.8;
}

.hero-accent {
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  z-index: 1;
}

/* ==================== Projects Section ==================== */
.projects-section {
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text);
  font-weight: 700;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.project-card {
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.2);
  height: 100%;
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.card-header {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.card-icon {
  font-size: 2.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.card-header h4 {
  font-size: 1.5rem;
  margin: 0;
  color: var(--color-text);
}

.card-description {
  color: var(--color-text-secondary);
  line-height: 1.8;
  flex: 1;
}

.card-features {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.feature-tag {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.card-btn {
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-align: center;
  transition: var(--transition);
  border: none;
  cursor: pointer;
  font-size: 0.95rem;
  display: inline-block;
  align-self: flex-start;
}

.card-btn.primary {
  background: var(--color-primary);
  color: white;
}

.card-btn.primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-glow);
}

/* ==================== Stats Section ==================== */
.stats-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.stat-card {
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.stat-label {
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ==================== Footer ==================== */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
  margin-top: var(--spacing-2xl);
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.footer p {
  margin: 0.25rem 0;
}

.footer-text {
  opacity: 0.8;
}

/* ==================== Login Page ==================== */
.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.login-container {
  width: 100%;
  max-width: 420px;
}

.login-card {
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.login-logo-section {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  color: var(--color-text);
}

.login-logo {
  height: 45px;
  width: auto;
}

.login-logo-section h2 {
  font-size: 1.35rem;
  margin: 0;
  color: var(--color-text);
}

.login-title {
  font-size: 1.75rem;
  text-align: center;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.login-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.form-label {
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.95rem;
}

.form-input {
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-bg-card);
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
  background: var(--color-bg-card);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

.login-btn {
  padding: 0.85rem 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
  margin-top: var(--spacing-sm);
}

.login-btn.primary {
  background: var(--color-primary);
  color: white;
}

.login-btn.primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}

/* ==================== Alert Messages ==================== */
.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  font-weight: 500;
}

.alert-error {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.alert-icon {
  font-size: 1.2rem;
}

/* ==================== Demo Credentials ==================== */
.demo-credentials {
  background: var(--color-bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  border: 1px solid var(--color-border);
}

.demo-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  font-size: 0.9rem;
}

.demo-item {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.demo-label {
  color: var(--color-text-secondary);
}

.demo-value {
  font-family: 'Courier New', monospace;
  font-weight: 600;
  color: var(--color-primary);
}

.login-footer {
  text-align: center;
  margin-top: var(--spacing-lg);
  font-size: 0.9rem;
}

.link {
  color: var(--color-primary);
  font-weight: 500;
}

.link:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    justify-content: center;
    gap: var(--spacing-md);
    height: auto;
    padding: var(--spacing-md) 0;
  }

  .nav {
    gap: var(--spacing-md);
    width: 100%;
    justify-content: center;
  }

  .hero h2 {
    font-size: 1.8rem;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .stats-section {
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  }

  .hero {
    padding: var(--spacing-lg);
  }

  .login-card {
    padding: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero h2 {
    font-size: 1.5rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .logo-section h1 {
    display: none;
  }

  .section-title {
    font-size: 1.4rem;
  }

  .card-header h4 {
    font-size: 1.25rem;
  }
}