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

:root {
    /* Primary - Blue Sky */
    --primary-50: #f0f9ff;
    --primary-100: #e0f2fe;
    --primary-200: #bae6fd;
    --primary-300: #7dd3fc;
    --primary-400: #38bdf8;
    --primary-500: #0ea5e9;
    --primary-600: #0284c7;
    --primary-700: #0369a1;
    --primary-800: #075985;
    --primary-900: #0c4a6e;

    /* Secondary - Indigo */
    --secondary-50: #eef2ff;
    --secondary-100: #e0e7ff;
    --secondary-200: #c7d2fe;
    --secondary-300: #a5b4fc;
    --secondary-400: #818cf8;
    --secondary-500: #6366f1;
    --secondary-600: #4f46e5;
    --secondary-700: #4338ca;
    --secondary-800: #3730a3;
    --secondary-900: #312e81;

    /* Success - Emerald */
    --success-400: #34d399;
    --success-500: #10b981;
    --success-600: #059669;

    /* Warning - Amber */
    --warning-400: #fbbf24;
    --warning-500: #f59e0b;

    /* Danger - Red */
    --danger-400: #f87171;
    --danger-500: #ef4444;

    /* Info - Blue */
    --info-100: #dbeafe;
    --info-400: #60a5fa;
    --info-500: #3b82f6;
    --info-600: #2563eb;
    --info-700: #1d4ed8;

    /* Surface */
    --surface-50: #ffffff;
    --surface-100: #f8fafc;
    --surface-200: #f1f5f9;
    --surface-300: #e2e8f0;

    /* Background */
    --bg-base: #ffffff;
    --bg-elevated: #f8fafc;

    /* Border */
    --border-default: #e2e8f0;
    --border-subtle: #f1f5f9;
    --border-strong: #cbd5e1;

    /* Typography */
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --text-disabled: #cbd5e1;
    --text-inverse: #ffffff;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-600) 100%);
    --gradient-hero: linear-gradient(135deg, var(--primary-600) 0%, var(--secondary-600) 100%);
    --gradient-card: linear-gradient(135deg, var(--primary-50) 0%, var(--secondary-50) 100%);
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background-color: var(--bg-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-subtle);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 40px;
    height: 40px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-link {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-link:hover {
    color: var(--primary-600);
    background: var(--primary-50);
}

/* Hero Section */
.hero {
    background: var(--gradient-hero);
    color: var(--text-inverse);
    padding: 100px 0 120px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 50%, rgba(56, 189, 248, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 24px;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.hero-slogan {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 32px;
    opacity: 0.95;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 28px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 15px;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    gap: 8px;
}

.btn-primary {
    background: var(--text-inverse);
    color: var(--primary-600);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-inverse);
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.4);
}

/* Section */
.section {
    padding: 100px 0;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 17px;
    text-align: center;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 56px;
    line-height: 1.7;
}

/* Problem Section */
.problem {
    background: var(--bg-elevated);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.card {
    background: var(--surface-50);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

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

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

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

.card-icon {
    font-size: 44px;
    margin-bottom: 16px;
    display: inline-block;
    padding: 12px;
    background: var(--gradient-card);
    border-radius: 12px;
}

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.card-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Solution Section */
.solution-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.solution-step {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.step-number {
    width: 52px;
    height: 52px;
    background: var(--gradient-primary);
    color: var(--text-inverse);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.step-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Features Section */
.features {
    background: var(--bg-elevated);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature {
    background: var(--surface-50);
    border-radius: 16px;
    padding: 32px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s ease;
}

.feature:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--secondary-200);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 16px;
    display: inline-block;
    padding: 10px;
    background: var(--secondary-50);
    border-radius: 12px;
}

.feature-title {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--text-inverse);
    padding: 56px 0 32px;
}

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

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-logo {
    font-size: 22px;
    font-weight: 700;
}

.footer-text {
    color: var(--text-tertiary);
    font-size: 14px;
}

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

.footer-contact {
    color: var(--text-tertiary);
    font-size: 14px;
    margin-bottom: 8px;
}

.footer-year {
    color: var(--text-tertiary);
    font-size: 14px;
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Responsive */
@media (max-width: 1024px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 640px) {
    .hero-logo {
        width: 64px;
        height: 64px;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-slogan {
        font-size: 17px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .section-title {
        font-size: 28px;
    }

    .section-subtitle {
        font-size: 15px;
    }

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

    .footer-content {
        flex-direction: column;
        text-align: center;
        gap: 24px;
    }

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

    .container {
        padding: 0 20px;
    }
}