/* ============================================
   PREMIUM DESIGN SYSTEM
   Auto Detailing Software Reviews
   Based on Premium Design Research
   ============================================ */

/* CSS Variables - Design Tokens */
:root {
    /* Color Palette - Premium & Trustworthy */
    --color-primary: #1a1a1a;
    --color-secondary: #0066cc;
    --color-accent: #00a86b;
    --color-background: #ffffff;
    --color-surface: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-light: #4a4a4a;
    --color-text-muted: #666666;
    --color-border: #e5e7eb;
    --color-success: #00a86b;
    --color-warning: #f59e0b;
    --color-error: #dc2626;
    
    /* Typography - Premium & Modern */
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    
    /* Spacing System - 4px base */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    
    /* Shadows - Subtle & Premium */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

h1 { font-size: 3.5rem; font-weight: 800; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--space-md);
    color: var(--color-text);
    line-height: 1.7;
}

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

a:hover {
    color: var(--color-primary);
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

/* Header & Navigation */
.header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--space-md) 0;
}

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

.header__logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.header__logo span {
    color: var(--color-secondary);
}

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

.nav__link {
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.nav__link:hover {
    color: var(--color-secondary);
}

.nav__cta {
    background: var(--color-secondary);
    color: white;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.nav__cta:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
    min-width: 44px;
    min-height: 44px;
}

.nav-toggle__bar {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero Section */
.hero {
    padding: var(--space-4xl) 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: white;
    text-align: center;
}

.hero__eyebrow {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-secondary);
    margin-bottom: var(--space-md);
}

.hero__title {
    font-size: 4rem;
    color: white;
    margin-bottom: var(--space-lg);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.1;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.hero__cta {
    display: inline-block;
    background: var(--color-secondary);
    color: white;
    padding: var(--space-md) var(--space-2xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1.125rem;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-lg);
}

.hero__cta:hover {
    background: white;
    color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

/* Trust Bar */
.trust-bar {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    padding: var(--space-xl) 0;
    margin: var(--space-2xl) 0;
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.9375rem;
    color: var(--color-text-light);
    font-weight: 500;
}

.trust-item__icon {
    color: var(--color-accent);
    font-weight: 700;
}

/* Section */
.section {
    padding: var(--space-4xl) 0;
}

.section--gray {
    background: var(--color-surface);
}

.section__header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section__title {
    font-size: 2.5rem;
    margin-bottom: var(--space-md);
}

.section__subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* Software Grid */
.software-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

/* Software Card */
.software-card {
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
    position: relative;
}

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

/* Top Pick Card */
.software-card--top-pick {
    border: 2px solid var(--color-secondary);
    box-shadow: var(--shadow-lg);
}

.software-card__badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: var(--color-secondary);
    color: white;
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    box-shadow: var(--shadow-md);
}

.software-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.software-card__logo {
    width: 56px;
    height: 56px;
    background: var(--color-surface);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text-light);
}

.software-card__name {
    font-size: 1.5rem;
    margin: 0;
}

.software-card__rating {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.software-card__stars {
    color: #fbbf24;
    font-size: 1.25rem;
}

.software-card__score {
    font-weight: 600;
    color: var(--color-text);
}

.software-card__tagline {
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
    font-size: 0.9375rem;
}

.software-card__features {
    list-style: none;
    margin-bottom: var(--space-lg);
}

.software-card__features li {
    padding: var(--space-xs) 0;
    color: var(--color-text);
    font-size: 0.9375rem;
}

.software-card__features li::before {
    content: "✓";
    color: var(--color-accent);
    font-weight: 700;
    margin-right: var(--space-sm);
}

.software-card__pricing {
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
    font-size: 0.9375rem;
}

.software-card__cta {
    display: block;
    width: 100%;
    background: var(--color-secondary);
    color: white;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.software-card__cta:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Comparison Table */
.comparison-table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: var(--space-2xl) 0;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.comparison-table thead {
    background: var(--color-primary);
    color: white;
}

.comparison-table th {
    padding: var(--space-lg);
    text-align: left;
    font-weight: 600;
    font-size: 0.9375rem;
}

.comparison-table td {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

.comparison-table .check {
    color: var(--color-accent);
    font-weight: 700;
}

.comparison-table .cross {
    color: var(--color-text-muted);
}

.comparison-table .recommended {
    background: rgba(0, 102, 204, 0.02);
}

/* Author Box */
.author-box {
    display: flex;
    gap: var(--space-xl);
    padding: var(--space-xl);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    margin: var(--space-3xl) 0;
}

.author-box__avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    flex-shrink: 0;
}

.author-box__content {
    flex: 1;
}

.author-box__name {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.author-box__credentials {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-sm);
}

.author-box__bio {
    font-size: 0.9375rem;
    margin: 0;
    color: var(--color-text);
}

/* Methodology Grid */
.methodology-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-2xl);
}

.methodology-item {
    padding: var(--space-xl);
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.methodology-item h4 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
    color: var(--color-secondary);
}

.methodology-item p {
    color: var(--color-text-light);
    margin: 0;
    font-size: 0.9375rem;
}

/* Footer */
.footer {
    background: var(--color-primary);
    color: white;
    padding: var(--space-3xl) 0 var(--space-xl);
}

.footer__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-2xl);
    margin-bottom: var(--space-2xl);
}

.footer__column h4 {
    color: white;
    margin-bottom: var(--space-md);
    font-size: 1rem;
}

.footer__links {
    list-style: none;
}

.footer__links li {
    margin-bottom: var(--space-sm);
}

.footer__links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
    font-size: 0.9375rem;
}

.footer__links a:hover {
    color: white;
}

.footer__bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-xl);
    text-align: center;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn--primary:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn--secondary {
    background: transparent;
    color: var(--color-secondary);
    border: 2px solid var(--color-secondary);
}

.btn--secondary:hover {
    background: var(--color-secondary);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
    
    .hero__title { font-size: 2.5rem; }
    .hero__subtitle { font-size: 1.125rem; }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--space-md);
        gap: var(--space-sm);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }
    
    .nav.nav--open {
        display: flex;
    }
    
    .nav__link {
        padding: var(--space-sm) 0;
    }
    
    .trust-bar {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .software-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-table {
        font-size: 0.875rem;
    }
    
    .comparison-table th,
    .comparison-table td {
        padding: var(--space-md);
        white-space: nowrap;
    }
    
    .author-box {
        flex-direction: column;
    }
    
    .methodology-grid {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--space-sm); }
.mt-2 { margin-top: var(--space-md); }
.mt-3 { margin-top: var(--space-lg); }
.mt-4 { margin-top: var(--space-xl); }

.mb-1 { margin-bottom: var(--space-sm); }
.mb-2 { margin-bottom: var(--space-md); }
.mb-3 { margin-bottom: var(--space-lg); }
.mb-4 { margin-bottom: var(--space-xl); }

.hidden { display: none; }
.visible { display: block; }