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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #8b5cf6;
    --accent: #f59e0b;
    --success: #10b981;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ====================================
   Header
   ==================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all 0.3s ease;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--gray-900);
    text-decoration: none;
}

.logo-icon {
    font-size: 1.75rem;
}

.logo-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--gray-600);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link.download-link {
    color: var(--primary);
    font-weight: 600;
}

/* ====================================
   Hero Section
   ==================================== */
.hero {
    position: relative;
    padding: 10rem 0 6rem;
    overflow: hidden;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 1400px;
    height: 600px;
    background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

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

.badge {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.6s ease;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
    animation: fadeInUp 0.6s ease 0.1s backwards;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
    max-width: 700px;
    margin: 0 auto 3rem;
    line-height: 1.7;
    animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 4rem;
    animation: fadeInUp 0.6s ease 0.3s backwards;
}

.hero-stats {
    display: flex;
    gap: 4rem;
    justify-content: center;
    padding: 3rem 0;
    border-top: 1px solid var(--gray-200);
    animation: fadeInUp 0.6s ease 0.4s backwards;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* ====================================
   Buttons
   ==================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 12px;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1.125rem 2rem;
    font-size: 1.0625rem;
}

.btn-disabled {
    background: var(--gray-200);
    color: var(--gray-500);
    cursor: not-allowed;
}

.btn-disabled:hover {
    transform: none;
}

/* ====================================
   Sections
   ==================================== */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-600);
}

/* ====================================
   Features Section
   ==================================== */
.features {
    background: var(--gray-50);
}

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

.feature-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-200);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.feature-description {
    color: var(--gray-600);
    line-height: 1.7;
}

/* ====================================
   Performance Section
   ==================================== */
.performance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.performance-card {
    text-align: center;
    padding: 2rem;
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.performance-chart {
    height: 200px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    margin-bottom: 2rem;
}

.chart-bar {
    width: 80px;
    height: var(--height);
    background: linear-gradient(180deg, var(--color, var(--success)) 0%, var(--color, var(--success)) 100%);
    border-radius: 12px 12px 0 0;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 1rem;
    box-shadow: var(--shadow-lg);
    animation: growUp 1s ease;
}

@keyframes growUp {
    from {
        height: 0;
    }
}

.chart-label {
    color: var(--white);
    font-weight: 700;
    font-size: 1.25rem;
}

.performance-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 1rem;
}

.performance-description {
    color: var(--gray-600);
    line-height: 1.7;
}

.performance-comparison {
    background: var(--white);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
}

.comparison-item {
    margin-bottom: 2rem;
}

.comparison-item:last-child {
    margin-bottom: 0;
}

.comparison-label {
    display: block;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 0.75rem;
}

.comparison-bar {
    height: 50px;
    background: var(--gray-100);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}

.comparison-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    color: var(--white);
    font-weight: 700;
    font-size: 1.125rem;
    border-radius: 12px;
    transition: width 1s ease;
}

/* ====================================
   Download Section
   ==================================== */
.download {
    background: var(--gray-50);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.download-card {
    background: var(--white);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: var(--shadow);
    border: 2px solid var(--gray-200);
    position: relative;
    transition: all 0.3s ease;
}

.download-card:hover:not(.disabled) {
    transform: translateY(-5px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--primary);
}

.download-card.highlight {
    border-color: var(--primary);
    box-shadow: var(--shadow-xl);
}

.download-card.disabled {
    opacity: 0.6;
}

.download-badge {
    position: absolute;
    top: -12px;
    right: 2rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 0.375rem 1rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-lg);
}

.download-icon {
    margin-bottom: 2rem;
}

.download-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.download-subtitle {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: 2rem;
}

.download-features {
    margin-bottom: 2rem;
}

.download-feature {
    padding: 0.75rem 0;
    color: var(--gray-700);
    font-weight: 500;
    border-bottom: 1px solid var(--gray-100);
}

.download-feature:last-child {
    border-bottom: none;
}

.download-feature.coming-soon {
    color: var(--gray-500);
}

.download-info {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--gray-500);
    text-align: center;
}

.requirements {
    background: var(--white);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.requirements-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 2rem;
    text-align: center;
}

.requirements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.requirement-item {
    padding: 1.25rem;
    background: var(--gray-50);
    border-radius: 12px;
    color: var(--gray-700);
    line-height: 1.6;
}

.requirement-item strong {
    color: var(--primary);
}

/* ====================================
   Survey Section
   ==================================== */
.survey {
    padding: 6rem 0;
}

.survey-card {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 32px;
    padding: 4rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
    box-shadow: var(--shadow-2xl);
    position: relative;
    overflow: hidden;
}

.survey-content {
    flex: 1;
    z-index: 1;
}

.survey-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 1rem;
}

.survey-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
    line-height: 1.7;
}

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

.survey-card .btn-primary:hover {
    transform: translateY(-2px) scale(1.05);
}

.survey-illustration {
    position: relative;
    width: 200px;
    height: 200px;
    flex-shrink: 0;
}

.illustration-blob {
    position: absolute;
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.blob-1 {
    width: 150px;
    height: 150px;
    background: rgba(255, 255, 255, 0.2);
    top: 0;
    left: 0;
}

.blob-2 {
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.15);
    bottom: 0;
    right: 0;
    animation-delay: -3s;
}

.illustration-emoji {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 5rem;
    animation: bounce 2s ease-in-out infinite;
}

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

@keyframes bounce {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
    }
}

/* ====================================
   Footer
   ==================================== */
.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: 4rem;
    margin-bottom: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--gray-800);
}

.footer-brand {
    flex: 1;
}

.footer .logo {
    margin-bottom: 1rem;
}

.footer .logo-text {
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.footer-links {
    display: flex;
    gap: 4rem;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-heading {
    color: var(--white);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.footer-link {
    color: var(--gray-400);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: var(--primary-light);
}

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

.footer-copyright {
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.footer-tech {
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* ====================================
   Animations
   ==================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ====================================
   Responsive Design
   ==================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .survey-card {
        flex-direction: column;
        text-align: center;
    }

    .survey-illustration {
        width: 150px;
        height: 150px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 1.5rem;
    }

    .header .container {
        height: 60px;
    }

    .nav {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.875rem;
    }

    .hero {
        padding: 8rem 0 4rem;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1.0625rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-stats {
        flex-direction: column;
        gap: 2rem;
    }

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

    .section-subtitle {
        font-size: 1.0625rem;
    }

    section {
        padding: 4rem 0;
    }

    .features-grid,
    .performance-grid,
    .download-grid {
        grid-template-columns: 1fr;
    }

    .survey-card {
        padding: 2.5rem 1.5rem;
    }

    .survey-title {
        font-size: 1.75rem;
    }

    .survey-description {
        font-size: 1rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }

    .footer-links {
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .logo-text {
        font-size: 1.0625rem;
    }

    .hero-title {
        font-size: 1.875rem;
    }

    .stat-value {
        font-size: 2rem;
    }

    .feature-card,
    .performance-card,
    .download-card {
        padding: 1.5rem;
    }

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