/* ===================================
   ENVISION - Core Design System
   CBSE Class X Prediction Platform
   =================================== */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ===== CSS Custom Properties ===== */
:root {
   /* Primary Colors */
   --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
   --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

   /* Dark Theme */
   --bg-dark: #0a0a0f;
   --bg-card: rgba(20, 20, 30, 0.8);
   --bg-glass: rgba(255, 255, 255, 0.05);
   --bg-glass-hover: rgba(255, 255, 255, 0.1);

   /* Text Colors */
   --text-primary: #ffffff;
   --text-secondary: rgba(255, 255, 255, 0.7);
   --text-muted: rgba(255, 255, 255, 0.5);

   /* Accent Colors */
   --accent-purple: #9c7cfa;
   --accent-pink: #f093fb;
   --accent-blue: #4facfe;
   --accent-cyan: #00f2fe;
   --accent-green: #43e97b;
   --accent-orange: #fa709a;

   /* Subject Colors */
   --maths-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   --science-gradient: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
   --sst-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
   --ai-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
   --english-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
   --hindi-gradient: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);

   /* Shadows */
   --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
   --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
   --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
   --shadow-glow: 0 0 30px rgba(156, 124, 250, 0.3);

   /* Border Radius */
   --radius-sm: 8px;
   --radius-md: 12px;
   --radius-lg: 20px;
   --radius-xl: 30px;

   /* Transitions */
   --transition-fast: 0.2s ease;
   --transition-normal: 0.3s ease;
   --transition-slow: 0.5s ease;

   /* Spacing */
   --spacing-xs: 0.5rem;
   --spacing-sm: 1rem;
   --spacing-md: 1.5rem;
   --spacing-lg: 2rem;
   --spacing-xl: 3rem;
   --spacing-2xl: 4rem;
}

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

html {
   scroll-behavior: smooth;
   font-size: 16px;
}

body {
   font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
   background: var(--bg-dark);
   color: var(--text-primary);
   line-height: 1.6;
   min-height: 100vh;
   overflow-x: hidden;
   position: relative;
}

/* Animated Background */
body::before {
   content: '';
   position: fixed;
   top: 0;
   left: 0;
   width: 100%;
   height: 100%;
   background:
      radial-gradient(ellipse at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
      radial-gradient(ellipse at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
      radial-gradient(ellipse at 50% 50%, rgba(156, 124, 250, 0.05) 0%, transparent 70%);
   z-index: -1;
   animation: bgPulse 15s ease-in-out infinite;
}

@keyframes bgPulse {

   0%,
   100% {
      opacity: 1;
   }

   50% {
      opacity: 0.7;
   }
}

/* ===== Typography ===== */
h1,
h2,
h3,
h4,
h5,
h6 {
   font-family: 'Outfit', sans-serif;
   font-weight: 700;
   line-height: 1.2;
   letter-spacing: -0.02em;
}

h1 {
   font-size: clamp(2.5rem, 5vw, 4rem);
   background: var(--primary-gradient);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
}

h2 {
   font-size: clamp(1.8rem, 3vw, 2.5rem);
}

h3 {
   font-size: clamp(1.2rem, 2vw, 1.5rem);
}

p {
   color: var(--text-secondary);
}

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

/* ===== Container ===== */
.container {
   width: 100%;
   max-width: 1400px;
   margin: 0 auto;
   padding: 0 var(--spacing-md);
}

/* ===== Header & Navigation ===== */
.header {
   position: fixed;
   top: 0;
   left: 0;
   right: 0;
   z-index: 1000;
   padding: var(--spacing-sm) 0;
   background: rgba(10, 10, 15, 0.8);
   backdrop-filter: blur(20px);
   -webkit-backdrop-filter: blur(20px);
   border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav {
   display: flex;
   justify-content: space-between;
   align-items: center;
}

.logo {
   display: flex;
   align-items: center;
   gap: var(--spacing-xs);
   font-family: 'Outfit', sans-serif;
   font-size: 1.8rem;
   font-weight: 800;
   background: var(--primary-gradient);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
}

.logo-icon {
   width: 40px;
   height: 40px;
   display: flex;
   align-items: center;
   justify-content: center;
   background: var(--primary-gradient);
   border-radius: var(--radius-md);
   font-size: 1.2rem;
}

.logo-icon svg {
   width: 24px;
   height: 24px;
   fill: white;
}

.nav-actions {
   display: flex;
   align-items: center;
   gap: var(--spacing-sm);
}

.nav-credit {
   font-size: 0.8rem;
   color: var(--text-muted);
   margin-left: var(--spacing-md);
   padding: 0.4rem 0.8rem;
   border: 1px solid rgba(255, 255, 255, 0.1);
   border-radius: 50px;
   transition: var(--transition-fast);
}

.nav-credit:hover {
   color: var(--accent-purple);
   border-color: var(--accent-purple);
}

@media (max-width: 768px) {
   .nav-credit {
      display: none;
   }
}

/* ===== Buttons ===== */
.btn {
   display: inline-flex;
   align-items: center;
   justify-content: center;
   gap: var(--spacing-xs);
   padding: 0.75rem 1.5rem;
   font-family: 'Inter', sans-serif;
   font-size: 0.9rem;
   font-weight: 600;
   border: none;
   border-radius: var(--radius-md);
   cursor: pointer;
   transition: var(--transition-normal);
   text-transform: none;
}

.btn-primary {
   background: var(--primary-gradient);
   color: white;
   box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
   transform: translateY(-2px);
   box-shadow: 0 6px 30px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
   background: var(--bg-glass);
   color: var(--text-primary);
   border: 1px solid rgba(255, 255, 255, 0.1);
   backdrop-filter: blur(10px);
}

.btn-secondary:hover {
   background: var(--bg-glass-hover);
   border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
   background: transparent;
   color: var(--text-primary);
   border: 2px solid var(--accent-purple);
}

.btn-outline:hover {
   background: var(--accent-purple);
   color: white;
}

.btn-icon {
   padding: 0.6rem;
   border-radius: var(--radius-sm);
}

/* ===== Hero Section ===== */
.hero {
   padding: 8rem 0 4rem;
   text-align: center;
}

.hero-content {
   max-width: 800px;
   margin: 0 auto;
}

.hero-badge {
   display: inline-flex;
   align-items: center;
   gap: var(--spacing-xs);
   padding: 0.5rem 1rem;
   background: var(--bg-glass);
   border: 1px solid rgba(255, 255, 255, 0.1);
   border-radius: 50px;
   font-size: 0.85rem;
   color: var(--text-secondary);
   margin-bottom: var(--spacing-md);
   backdrop-filter: blur(10px);
}

.hero-badge span {
   color: var(--accent-purple);
   font-weight: 600;
}

.hero h1 {
   margin-bottom: var(--spacing-md);
}

.hero-subtitle {
   font-size: 1.2rem;
   color: var(--text-secondary);
   max-width: 600px;
   margin: 0 auto var(--spacing-lg);
}

/* ===== Glassmorphism Card ===== */
.glass-card {
   background: var(--bg-glass);
   backdrop-filter: blur(20px);
   -webkit-backdrop-filter: blur(20px);
   border: 1px solid rgba(255, 255, 255, 0.1);
   border-radius: var(--radius-lg);
   transition: var(--transition-normal);
}

.glass-card:hover {
   background: var(--bg-glass-hover);
   border-color: rgba(255, 255, 255, 0.2);
   transform: translateY(-5px);
   box-shadow: var(--shadow-lg);
}

/* ===== Section Title ===== */
.section-title {
   text-align: center;
   margin-bottom: var(--spacing-xl);
}

.section-title h2 {
   margin-bottom: var(--spacing-xs);
}

.section-title p {
   color: var(--text-muted);
}

/* ===== Footer ===== */
.footer {
   padding: var(--spacing-xl) 0 var(--spacing-lg);
   text-align: center;
   border-top: 1px solid rgba(255, 255, 255, 0.05);
   margin-top: var(--spacing-2xl);
}

.footer p {
   color: var(--text-muted);
   font-size: 0.9rem;
}

.footer a {
   color: var(--accent-purple);
}

.footer a:hover {
   text-decoration: underline;
}

/* ===== Utilities ===== */
.hidden {
   display: none !important;
}

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

.text-gradient {
   background: var(--primary-gradient);
   -webkit-background-clip: text;
   -webkit-text-fill-color: transparent;
   background-clip: text;
}

.sr-only {
   position: absolute;
   width: 1px;
   height: 1px;
   padding: 0;
   margin: -1px;
   overflow: hidden;
   clip: rect(0, 0, 0, 0);
   white-space: nowrap;
   border: 0;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
   .container {
      padding: 0 var(--spacing-sm);
   }
}

@media (max-width: 768px) {
   html {
      font-size: 15px;
   }

   .hero {
      padding: 7rem 0 3rem;
   }

   .btn {
      padding: 0.65rem 1.25rem;
      font-size: 0.85rem;
   }
}

@media (max-width: 480px) {
   html {
      font-size: 14px;
   }

   .hero {
      padding: 6rem 0 2rem;
   }

   .logo {
      font-size: 1.5rem;
   }

   .logo-icon {
      width: 35px;
      height: 35px;
   }
}

/* ===== Loading Spinner ===== */
.spinner {
   width: 40px;
   height: 40px;
   border: 3px solid var(--bg-glass);
   border-top-color: var(--accent-purple);
   border-radius: 50%;
   animation: spin 0.8s linear infinite;
}

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

.loading-overlay {
   position: fixed;
   inset: 0;
   display: flex;
   align-items: center;
   justify-content: center;
   background: rgba(10, 10, 15, 0.9);
   z-index: 9999;
}

/* ===== Toast Notifications ===== */
.toast-container {
   position: fixed;
   bottom: var(--spacing-lg);
   right: var(--spacing-lg);
   z-index: 10000;
   display: flex;
   flex-direction: column;
   gap: var(--spacing-sm);
}

.toast {
   padding: var(--spacing-sm) var(--spacing-md);
   background: var(--bg-card);
   border-radius: var(--radius-md);
   border-left: 4px solid var(--accent-purple);
   box-shadow: var(--shadow-lg);
   animation: slideIn 0.3s ease;
}

.toast.success {
   border-left-color: var(--accent-green);
}

.toast.error {
   border-left-color: #ff4757;
}

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

   to {
      transform: translateX(0);
      opacity: 1;
   }
}

/* ===== Empty State ===== */
.empty-state {
   text-align: center;
   padding: var(--spacing-2xl);
}

.empty-state svg {
   width: 80px;
   height: 80px;
   margin-bottom: var(--spacing-md);
   opacity: 0.3;
}

.empty-state h3 {
   margin-bottom: var(--spacing-xs);
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
   width: 8px;
   height: 8px;
}

::-webkit-scrollbar-track {
   background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
   background: rgba(156, 124, 250, 0.3);
   border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
   background: rgba(156, 124, 250, 0.5);
}