/* ============================================
   MODERN DESIGN SYSTEM - Comprehensive Updates
   ============================================ */

/* Root CSS Variables for Modern Design */
:root {
  /* Modern Color Palette */
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #3b82f6 100%);
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary-gradient: linear-gradient(135deg, #06b6d4 0%, #0ea5e9 100%);
  --secondary-dark: #0891b2;
  --accent-gradient: linear-gradient(135deg, #ec4899 0%, #f43f5e 100%);
  --accent-dark: #be123c;
  --success-gradient: linear-gradient(135deg, #10b981 0%, #14b8a6 100%);
  --success-dark: #059669;
  --warning-gradient: linear-gradient(135deg, #f59e0b 0%, #eab308 100%);
  --danger-gradient: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
  
  /* Neutral Colors */
  --dark-bg: #0f172a;
  --dark-secondary: #1e293b;
  --light-bg: #f8fafc;
  --light-secondary: #f1f5f9;
  --text-dark: #1e293b;
  --text-light: #475569;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --border-subtle: #cbd5e1;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.1);
  --shadow-lg: 0 12px 24px rgba(15, 23, 42, 0.15);
  --shadow-xl: 0 20px 40px rgba(15, 23, 42, 0.2);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Typography */
  --font-primary: 'Segoe UI', 'Inter', 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Line Heights */
  --lh-tight: 1.25;
  --lh-normal: 1.5;
  --lh-relaxed: 1.75;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   BASE STYLES
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  background-color: var(--light-bg);
  color: var(--text-dark);
  line-height: var(--lh-normal);
  overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--lh-tight);
  color: var(--text-dark);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-5xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--font-size-4xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--font-size-3xl);
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
  line-height: var(--lh-relaxed);
}

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

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

/* ============================================
   FIXED HEADER - MODERNIZED
   ============================================ */

.fixed-header {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 1000;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.95), rgba(248, 250, 252, 0.8));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.4);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.08), 0 4px 12px rgba(15, 23, 42, 0.05);
  padding: 0.5rem 0;
  line-height: auto;
}

.fixed-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  flex-wrap: wrap;
}

.logo-link {
  display: flex;
  align-items: center;
  margin-right: auto;
  transition: transform var(--transition-base);
}

.logo-link:hover {
  transform: scale(1.02);
}

.logo-link img {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  background: white;
}

/* Header Navigation Links */
.header-left-link,
.header-right-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  list-style: none;
  padding: 0;
  margin: 0;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.header-left-link li,
.header-right-link li {
  margin: 0;
  display: flex;
  align-items: center;
}

.header-left-link li a,
.header-right-link li a {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  color: var(--text-dark);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  text-transform: capitalize;
  position: relative;
  overflow: hidden;
}

.header-left-link li a::before,
.header-right-link li a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.header-left-link li a:hover::before,
.header-right-link li a:hover::before {
  transform: scaleX(1);
}

.header-left-link li a:hover,
.header-right-link li a:hover {
  color: var(--primary-dark);
  background-color: rgba(99, 102, 241, 0.05);
}

/* ============================================
   BUTTONS - MODERNIZED
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: 2px solid transparent;
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  text-transform: capitalize;
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

/* Button Primary */
.btn.btn--primary {
  background: var(--primary-gradient);
  color: white;
  border-color: var(--primary-dark);
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
  border-color: var(--primary-dark);
}

.btn.btn--primary:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.2);
}

/* Button Secondary */
.btn.btn--secondary {
  background: transparent;
  color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn.btn--secondary:hover {
  background: rgba(79, 70, 229, 0.08);
  border-color: var(--primary-dark);
}

/* Button Reverse (Alternative) */
.btn.btn--reverse {
  background: var(--primary-gradient);
  color: white;
  border-color: var(--primary-dark);
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

.btn.btn--reverse:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

/* Button Reverse Outline */
.btn.btn--reverse-outline {
  background: transparent;
  color: var(--primary-dark);
  border: 2px solid var(--primary-dark);
}

.btn.btn--reverse-outline:hover {
  background: var(--primary-gradient);
  color: white;
  border-color: var(--primary-dark);
  transform: translateY(-2px);
}

/* Button Link */
.btn.btn--link {
  background: transparent;
  color: var(--primary-dark);
  border: none;
  padding: var(--spacing-sm);
}

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

/* Button Disabled State */
.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================
   FORMS & INPUTS
   ============================================ */

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="tel"],
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  background-color: white;
  color: var(--text-dark);
  transition: all var(--transition-base);
  outline: none;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
input[type="tel"]:focus,
textarea:focus,
select:focus {
  border-color: var(--primary-dark);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
  background-color: rgba(99, 102, 241, 0.02);
}

input[type="text"]::placeholder,
textarea::placeholder {
  color: var(--text-muted);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* ============================================
   CARDS
   ============================================ */

.card {
  background: white;
  border-radius: var(--radius-2xl);
  border: 1px solid var(--border-color);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--border-subtle);
}

.card-header {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.card-body {
  color: var(--text-light);
  line-height: var(--lh-relaxed);
}

.card-footer {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ============================================
   ALERTS
   ============================================ */

.alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  margin-bottom: var(--spacing-md);
  animation: slideDown var(--transition-base) ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert-success {
  background: rgba(16, 185, 129, 0.08);
  border-color: #10b981;
  color: #047857;
}

.alert-danger,
.alert-error {
  background: rgba(239, 68, 68, 0.08);
  border-color: #ef4444;
  color: #991b1b;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.08);
  border-color: #f59e0b;
  color: #b45309;
}

.alert-info {
  background: rgba(59, 130, 246, 0.08);
  border-color: #3b82f6;
  color: #1e40af;
}

/* ============================================
   BADGES
   ============================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  background: var(--light-secondary);
  color: var(--text-dark);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-primary {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary-dark);
}

.badge-success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--success-dark);
}

.badge-danger {
  background: rgba(239, 68, 68, 0.1);
  color: #991b1b;
}

/* ============================================
   LOADER & ANIMATIONS
   ============================================ */

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

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.loading {
  position: relative;
}

.loading:before {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 10;
  content: "";
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-dark);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* ============================================
   CONTAINERS & SPACING
   ============================================ */

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

.page-container,
.page-container-responsive {
  margin: var(--spacing-3xl) auto;
  padding: 0 var(--spacing-lg);
  max-width: 1200px;
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-2xl);
  color: var(--text-dark);
  text-align: center;
}

/* ============================================
   UTILITIES
   ============================================ */

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.mt-auto {
  margin-top: auto;
}

.mb-auto {
  margin-bottom: auto;
}

.d-flex {
  display: flex;
}

.align-items-center {
  align-items: center;
}

.justify-content-center {
  justify-content: center;
}

.justify-content-between {
  justify-content: space-between;
}

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  h1 {
    font-size: var(--font-size-3xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }

  h3 {
    font-size: var(--font-size-xl);
  }

  .header-left-link,
  .header-right-link {
    gap: var(--spacing-sm);
  }

  .header-left-link li a,
  .header-right-link li a {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
  }

  .btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: var(--font-size-2xl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }

  h3 {
    font-size: var(--font-size-lg);
  }

  .btn {
    width: 100%;
  }

  .section {
    padding: var(--spacing-xl) 0;
  }
}

/* ============================================
   GRADIENT OVERLAYS
   ============================================ */

.gradient-overlay {
  position: relative;
}

.gradient-overlay::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--primary-gradient);
  opacity: 0.05;
  pointer-events: none;
  border-radius: inherit;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  padding: 8rem 0 6rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: var(--primary-gradient);
  border-radius: 50%;
  opacity: 0.1;
  filter: blur(100px);
  animation: float 20s ease-in-out infinite;
  z-index: -1;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: var(--secondary-gradient);
  border-radius: 50%;
  opacity: 0.1;
  filter: blur(100px);
  animation: float 15s ease-in-out infinite reverse;
  z-index: -1;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, #6366f1 0%, #0891b2 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-light);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================
   FEATURE CARDS
   ============================================ */

.feature-card {
  text-align: center;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-2xl);
  background: white;
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--primary-dark);
  box-shadow: 0 20px 40px rgba(99, 102, 241, 0.15);
  transform: translateY(-8px);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-lg);
  border-radius: var(--radius-xl);
  background: var(--primary-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
}

.feature-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-dark);
}

.feature-description {
  font-size: var(--font-size-sm);
  color: var(--text-light);
  line-height: var(--lh-relaxed);
}

/* ============================================
   CUSTOM SCROLLBAR
   ============================================ */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--light-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-dark);
  border-radius: var(--radius-full);
  transition: background var(--transition-base);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-light);
}

/* ============================================
   FOCUS STATES
   ============================================ */

*:focus-visible {
  outline: 2px solid var(--primary-dark);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary-dark);
  outline-offset: 2px;
}