/* ============================================
   CSS Variables & Reset
   ============================================ */
:root {
    --color-bg: #f8f9fa;
    --color-bg-alt: #ffffff;
    --color-text: #1a1a1a;
    --color-text-light: #6b7280;
    --color-accent: #1e3a5f;
    --color-accent-light: #2d5a87;
    --color-border: #e5e7eb;
    --color-success: #10b981;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --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: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 20px;
    
    --shadow-sm: 0 1px 2px 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);
    
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    --container-max: 1200px;
    --header-height: 80px;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

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

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-accent);
    color: white;
    border: 2px solid var(--color-accent);
}

.btn-primary:hover {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-full {
    width: 100%;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(248, 249, 250, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all var(--transition-base);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

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

.nav a {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
    position: relative;
}

.nav a:hover {
    color: var(--color-text);
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-base);
}

.nav a:hover::after {
    width: 100%;
}

.nav-cta {
    background-color: var(--color-accent);
    color: white !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    background-color: var(--color-accent-light);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-base);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding-top: calc(var(--header-height) + var(--spacing-3xl));
    padding-bottom: var(--spacing-3xl);
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content h1 {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 500px;
}

.hero-tagline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xl);
    padding-left: var(--spacing-md);
    border-left: 3px solid var(--color-accent);
}

.hero-tagline span {
    font-size: var(--font-size-base);
    color: var(--color-text);
    font-weight: 500;
}

.hero-image {
    position: relative;
}

.hero-image img {
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

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

/* ============================================
   What Section
   ============================================ */
.section-what {
    background-color: var(--color-bg-alt);
}

.what-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.what-text .lead {
    font-size: var(--font-size-xl);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.what-text p {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.features-mini {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.feature-mini {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
}

.feature-mini svg {
    width: 20px;
    height: 20px;
    color: var(--color-success);
    flex-shrink: 0;
}

.feature-mini span {
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.what-image img {
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
}

/* ============================================
   Uses Section
   ============================================ */
.uses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.use-card {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.use-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.use-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.use-icon svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

.use-card h3 {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.use-card p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.uses-note {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--color-accent);
}

.uses-note svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.uses-note p {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
}

/* ============================================
   Benefits Section
   ============================================ */
.section-benefits {
    background-color: var(--color-bg-alt);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.benefit-card {
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-bg) 0%, rgba(255,255,255,0.5) 100%);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.benefit-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.benefit-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.3;
    margin-bottom: var(--spacing-sm);
}

.benefit-card h3 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.benefit-card p {
    color: var(--color-text-light);
}

.benefits-perfect {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--border-radius);
}

.benefits-perfect p {
    color: var(--color-text-light);
}

/* ============================================
   Design Section
   ============================================ */
.design-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.design-image img {
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-lg);
}

.design-text h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.design-text .lead {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.design-list {
    margin-bottom: var(--spacing-lg);
}

.design-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    font-weight: 500;
}

.design-list svg {
    width: 20px;
    height: 20px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.design-note {
    padding: var(--spacing-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--color-accent);
}

.design-note p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

/* ============================================
   Target Section
   ============================================ */
.section-target {
    background-color: var(--color-bg-alt);
}

.target-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.target-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    font-weight: 500;
}

.target-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent);
}

.target-icon {
    font-size: var(--font-size-2xl);
}

/* ============================================
   CTA / Contact Section
   ============================================ */
.section-cta {
    background: linear-gradient(135deg, var(--color-accent) 0%, #0f2942 100%);
    color: white;
}

.cta-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.cta-text h2 {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.cta-text p {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    line-height: 1.7;
}

.contact-form {
    background-color: var(--color-bg-alt);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
}

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

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(30, 58, 95, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-light);
}

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

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--color-text);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    color: white;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.footer-brand p {
    font-size: var(--font-size-sm);
    opacity: 0.7;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    font-size: var(--font-size-sm);
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.footer-links a:hover {
    opacity: 1;
}

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

.footer-bottom p {
    font-size: var(--font-size-sm);
    opacity: 0.5;
}

/* ============================================
   Form Success State
   ============================================ */
.form-success {
    text-align: center;
    padding: var(--spacing-xl);
}

.form-success svg {
    width: 64px;
    height: 64px;
    color: var(--color-success);
    margin-bottom: var(--spacing-md);
}

.form-success h3 {
    font-size: var(--font-size-xl);
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.form-success p {
    color: var(--color-text-light);
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --font-size-5xl: 2.75rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }
    
    .hero .container,
    .what-content,
    .design-content,
    .cta-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .hero-content {
        text-align: center;
    }
    
    .hero-description {
        max-width: 100%;
    }
    
    .hero-tagline {
        align-items: center;
        border-left: none;
        padding-left: 0;
        border-top: 3px solid var(--color-accent);
        padding-top: var(--spacing-md);
    }
    
    .design-content {
        direction: ltr;
    }
    
    .uses-grid,
    .target-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-bg-alt);
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }
    
    .nav.active {
        display: flex;
    }
    
    .nav a {
        padding: var(--spacing-sm);
        width: 100%;
        text-align: center;
    }
    
    .nav-cta {
        margin-top: var(--spacing-sm);
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .uses-grid,
    .target-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}