/* ============================================================================
   EXAM PREP PORTAL - LANDING PAGE DESIGN SYSTEM
   Based on Mobile App Design Tokens
   ============================================================================ */

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - From Design Tokens */
    --primary-50: #F0F7FF;
    --primary-100: #E0EEFF;
    --primary-200: #BAD9FF;
    --primary-300: #7EC0FF;
    --primary-400: #4C9CFF;
    --primary-500: #0052FF;
    --primary-600: #0041CC;
    --primary-700: #003399;
    --primary-800: #002166;
    --primary-900: #001133;

    --secondary-500: #A855F7;
    --secondary-600: #9333EA;
    --secondary-700: #7E22CE;
    --secondary-800: #6D28D9;

    --success-500: #22C55E;
    --success-600: #16A34A;

    --warning-500: #F59E0B;
    --warning-600: #D97706;

    --error-500: #EF4444;

    --neutral-0: #FFFFFF;
    --neutral-50: #F9FAFB;
    --neutral-100: #F3F4F6;
    --neutral-200: #E5E7EB;
    --neutral-300: #D1D5DB;
    --neutral-400: #9CA3AF;
    --neutral-500: #6B7280;
    --neutral-600: #4B5563;
    --neutral-700: #374151;
    --neutral-800: #1F2937;
    --neutral-900: #111827;

    /* Typography */
    --font-primary: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing - 8pt Grid */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
    --spacing-3xl: 32px;
    --spacing-4xl: 40px;
    --spacing-5xl: 48px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --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-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0052FF 0%, #6D28D9 100%);
    --gradient-secondary: linear-gradient(135deg, #A855F7 0%, #0052FF 100%);
    --gradient-accent: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
    --gradient-mesh: radial-gradient(at 0% 0%, rgba(0, 82, 255, 0.2) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(168, 85, 247, 0.2) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(0, 82, 255, 0.2) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(168, 85, 247, 0.2) 0px, transparent 50%);
}

body {
    font-family: var(--font-primary);
    color: var(--neutral-900);
    background: var(--neutral-0);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    z-index: 1000;
    padding: var(--spacing-lg) 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav.scrolled {
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--neutral-900);
    text-decoration: none;
}

.logo-svg {
    height: 52px;
    width: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    border-radius: var(--radius-lg);
    font-weight: 600;
    font-size: 0.9375rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0) 100%);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--neutral-0);
    box-shadow: 0 4px 14px 0 rgba(0, 82, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(0, 82, 255, 0.5);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-3xl);
    font-size: 1.0625rem;
}

.btn-full {
    width: 100%;
}

/* Hero Section */
.hero {
    padding-top: calc(80px + var(--spacing-5xl));
    padding-bottom: var(--spacing-5xl);
    background: var(--neutral-900);
    color: var(--neutral-0);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-mesh);
    opacity: 0.6;
}

.hero::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 82, 255, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(100px);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translate(0, 0) scale(1);
    }

    33% {
        transform: translate(50px, -50px) scale(1.1);
    }

    66% {
        transform: translate(-50px, 50px) scale(0.9);
    }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: var(--spacing-2xl);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success-500);
    border-radius: 50%;
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.5;
        transform: scale(1.1);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, #4C9CFF 0%, #A855F7 50%, #F59E0B 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
    to {
        background-position: 200% center;
    }
}

.hero-subtitle {
    font-size: 1.25rem;
    line-height: 1.8;
    opacity: 0.9;
    margin-bottom: var(--spacing-3xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    margin-bottom: var(--spacing-4xl);
}

.hero-note {
    margin-top: var(--spacing-lg);
    font-size: 0.9375rem;
    opacity: 0.8;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-3xl);
    margin-top: var(--spacing-4xl);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Problem Section */
.problem-section {
    padding: var(--spacing-5xl) 0;
    background: var(--neutral-50);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-900);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--neutral-600);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
}

.problem-card {
    background: var(--neutral-0);
    padding: var(--spacing-3xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--neutral-200);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.problem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-200);
}

.problem-card:hover::before {
    transform: scaleX(1);
}

.problem-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    filter: grayscale(0.3);
}

.problem-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-900);
}

.problem-card p {
    color: var(--neutral-600);
    line-height: 1.7;
}

/* Solution Section */
.solution-section {
    padding: var(--spacing-5xl) 0;
    background: var(--neutral-0);
}

.solution-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.section-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-lg);
    background: var(--gradient-primary);
    color: var(--neutral-0);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.section-description {
    font-size: 1.125rem;
    color: var(--neutral-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-2xl);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--neutral-50);
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
}

.feature-item:hover {
    background: var(--primary-50);
    transform: translateX(4px);
}

.feature-icon {
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    color: var(--neutral-0);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 700;
    font-size: 0.875rem;
}

.feature-item h4 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--neutral-900);
}

.feature-item p {
    color: var(--neutral-600);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Phone Mockup */
.solution-visual {
    position: relative;
}

.phone-mockup {
    position: relative;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
    filter: drop-shadow(0 25px 50px rgba(0, 0, 0, 0.15));
}

.phone-screen {
    background: linear-gradient(135deg, var(--neutral-900) 0%, var(--neutral-800) 100%);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-md);
    position: relative;
}

.phone-screen::before {
    content: '';
    position: absolute;
    top: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 20px;
    background: var(--neutral-900);
    border-radius: var(--radius-full);
}

.app-preview {
    background: var(--neutral-0);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.preview-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--neutral-200);
}

.preview-avatar {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    color: var(--neutral-0);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

.preview-name {
    font-weight: 600;
    color: var(--neutral-900);
    font-size: 0.9375rem;
}

.preview-status {
    font-size: 0.75rem;
    color: var(--success-500);
}

.preview-message {
    background: var(--neutral-100);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--neutral-700);
    line-height: 1.6;
}

.preview-question {
    background: linear-gradient(135deg, rgba(0, 82, 255, 0.05), rgba(168, 85, 247, 0.05));
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    border: 1px solid var(--primary-100);
}

.preview-question strong {
    color: var(--neutral-900);
}

.preview-options {
    margin-top: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.preview-option {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--neutral-0);
    border: 2px solid var(--neutral-200);
    border-radius: var(--radius-md);
    font-size: 0.8125rem;
    transition: all 0.2s ease;
}

.preview-option.selected {
    border-color: var(--success-500);
    background: rgba(34, 197, 94, 0.1);
    color: var(--success-600);
    font-weight: 600;
}

/* Features Grid */
.features-section {
    padding: var(--spacing-5xl) 0;
    background: var(--neutral-900);
    color: var(--neutral-0);
    position: relative;
    overflow: hidden;
}

.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-mesh);
    opacity: 0.3;
}

.features-section .section-title,
.features-section .section-subtitle {
    color: var(--neutral-0);
    position: relative;
    z-index: 1;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-2xl);
    position: relative;
    z-index: 1;
}

.feature-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    padding: var(--spacing-3xl);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.feature-card-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    filter: grayscale(0.2);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-0);
}

.feature-card p {
    color: var(--neutral-300);
    line-height: 1.7;
}

/* Exams Section */
.exams-section {
    padding: var(--spacing-5xl) 0;
    background: var(--neutral-50);
}

.exams-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

.exam-badge {
    padding: var(--spacing-md) var(--spacing-2xl);
    background: var(--gradient-primary);
    color: var(--neutral-0);
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 1.0625rem;
    transition: all 0.2s ease;
}

.exam-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 82, 255, 0.3);
}

/* CTA Section */
.cta-section {
    padding: var(--spacing-5xl) 0;
    background: var(--neutral-900);
    color: var(--neutral-0);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-mesh);
    opacity: 0.4;
}

.cta-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: start;
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
}

.cta-subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-2xl);
}

.cta-benefits {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.0625rem;
}

/* Form */
.cta-form-container {
    position: relative;
}

.waitlist-form {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    padding: var(--spacing-3xl);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--neutral-0);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-family: var(--font-primary);
    background: rgba(255, 255, 255, 0.05);
    color: var(--neutral-0);
    transition: all 0.2s ease;
}

.form-group input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-400);
    background: rgba(255, 255, 255, 0.08);
}

.form-note {
    text-align: center;
    font-size: 0.875rem;
    color: var(--neutral-400);
    margin-top: var(--spacing-md);
}

.success-message {
    display: none;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    padding: var(--spacing-4xl);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.success-message.show {
    display: block;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    color: var(--neutral-0);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    margin: 0 auto var(--spacing-lg);
}

.success-message h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-0);
}

.success-message p {
    color: var(--neutral-300);
    font-size: 1.0625rem;
}

/* Footer */
.footer {
    background: var(--neutral-900);
    color: var(--neutral-300);
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-3xl);
}

.footer-brand .logo {
    color: var(--neutral-0);
    margin-bottom: var(--spacing-md);
}

.footer-tagline {
    color: var(--neutral-400);
    line-height: 1.7;
}

.footer-column h4 {
    color: var(--neutral-0);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-column a {
    display: block;
    color: var(--neutral-400);
    text-decoration: none;
    margin-bottom: var(--spacing-sm);
    transition: color 0.2s ease;
}

.footer-column a:hover {
    color: var(--neutral-0);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-2xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--neutral-500);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .solution-content,
    .cta-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 2rem;
    }

    .cta-title {
        font-size: 2rem;
    }

    .phone-mockup {
        max-width: 280px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}