/* ================================
   STACK PICK - MAIN STYLESHEET
   Updated: February 17, 2026
   ================================ */

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

/* ROOT VARIABLES */
:root {
    /* Light mode colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --accent-primary: #3B82F6;
    --accent-secondary: #8B5CF6;
    --border-color: #E2E8F0;
    --card-bg: #F8FAFC;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --focus-ring: 0 0 0 3px rgba(59, 130, 246, 0.3);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* Dark mode colors */
[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --accent-primary: #60A5FA;
    --accent-secondary: #A78BFA;
    --border-color: #334155;
    --card-bg: #1E293B;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.3);
    --focus-ring: 0 0 0 3px rgba(96, 165, 250, 0.3);
}

/* BASE STYLES */
html {
    scroll-behavior: smooth;
}

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

/* ACCESSIBILITY: Skip to main content */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--accent-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 1000;
}

.skip-link:focus {
    top: 0;
}

/* TYPOGRAPHY */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 1rem;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: 0.75rem;
}

h3 {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

/* LINKS */
a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--accent-secondary);
}

a:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* Remove default focus for mouse users, keep for keyboard */
a:focus:not(:focus-visible) {
    outline: none;
}

a:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* HEADER */
header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color var(--transition-normal);
    backdrop-filter: blur(10px);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.02);
}

.logo:focus {
    outline: 2px solid var(--accent-primary);
    outline-offset: 4px;
    border-radius: 4px;
}

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

/* NAVIGATION */
nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

nav a {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-fast);
}

/* Underline animation on hover */
nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width var(--transition-fast);
}

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

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

/* THEME TOGGLE */
.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    border-color: var(--accent-primary);
    transform: rotate(20deg);
}

.theme-toggle:focus {
    box-shadow: var(--focus-ring);
}

/* MOBILE MENU TOGGLE */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
}

.menu-toggle:hover {
    background-color: var(--bg-secondary);
}

.menu-toggle:focus {
    box-shadow: var(--focus-ring);
}

/* HERO SECTION */
.hero {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
    color: white;
    padding: 4rem 1.5rem;
    text-align: center;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
    color: white;
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    margin-bottom: 2rem;
    color: rgba(255,255,255,0.9);
}

/* CTA BUTTONS */
.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    display: inline-block;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn-primary:focus {
    box-shadow: 0 0 0 3px rgba(255,255,255,0.4);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-secondary:focus {
    box-shadow: 0 0 0 3px rgba(255,255,255,0.4);
}

/* CONTAINER */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

/* SECTION */
.section {
    margin-bottom: 4rem;
}

.section-title {
    text-align: center;
    margin-bottom: 2rem;
}

.section-title h2 {
    color: var(--text-primary);
}

.section-title p {
    color: var(--text-secondary);
}

/* CATEGORY GRID */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.category-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    text-decoration: none;
    display: block;
}

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

.category-card:focus {
    box-shadow: var(--focus-ring), var(--shadow-lg);
    border-color: var(--accent-primary);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    transition: transform var(--transition-fast);
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

.category-card h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.category-card p {
    font-size: 0.9rem;
}

/* PRODUCT GRID */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.product-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

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

.product-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    background-color: var(--bg-secondary);
}

.product-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.product-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    width: fit-content;
}

.product-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.product-price {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 1rem;
}

.product-features {
    list-style: none;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.product-features li {
    padding: 0.25rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
}

.product-features li:before {
    content: "✓ ";
    color: var(--accent-primary);
    font-weight: 700;
    margin-right: 0.5rem;
    flex-shrink: 0;
}

.product-btn {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    display: inline-block;
}

.product-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.product-btn:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

/* FOOTER */
footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 1.5rem;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-container p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.footer-container a {
    color: var(--accent-primary);
    text-decoration: underline;
}

.footer-container a:hover {
    color: var(--accent-secondary);
}

/* MOBILE RESPONSIVE */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 1rem;
        gap: 0.5rem;
        box-shadow: var(--shadow-lg);
    }
    
    nav.active {
        display: flex;
    }
    
    nav a {
        width: 100%;
        padding: 0.75rem;
        text-align: center;
    }
    
    nav a::after {
        display: none;
    }
    
    .theme-toggle {
        margin-top: 0.5rem;
    }
    
    .hero {
        padding: 3rem 1.5rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 2rem 1rem;
    }
}

/* TABLET */
@media (min-width: 769px) and (max-width: 1024px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* REDUCED MOTION */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* PRINT STYLES */
@media print {
    header,
    footer,
    .theme-toggle,
    .menu-toggle,
    .cta-buttons,
    .product-btn {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    a {
        text-decoration: underline;
    }
    
    a[href]:after {
        content: " (" attr(href) ")";
    }
}

/* ================================
   DESIGN IMPROVEMENTS - Feb 2026
   ================================ */

/* ACTIVE NAV STATE */
nav a[aria-current="page"] {
    color: var(--accent-primary);
}
nav a[aria-current="page"]::after {
    width: 100%;
}

/* BREADCRUMB */
.breadcrumb-bar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
}

.breadcrumb-list li {
    color: var(--text-secondary);
}

.breadcrumb-list a {
    color: var(--accent-primary);
    text-decoration: none;
}

.breadcrumb-list a:hover {
    text-decoration: underline;
}

.breadcrumb-list [aria-current="page"] {
    color: var(--text-primary);
    font-weight: 500;
}

.breadcrumb-sep {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

/* PRODUCT IMAGE PLACEHOLDER (until real images added) */
.product-image-placeholder {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--border-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    border-bottom: 1px solid var(--border-color);
}

/* PRICE WAS (strikethrough) */
.price-was {
    text-decoration: line-through;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 400;
    margin-left: 0.25rem;
}

/* BUYING GUIDE */
.buying-guide {
    max-width: 800px;
    margin: 0 auto;
}

.buying-guide h3 {
    color: var(--text-primary);
    margin-top: 1.75rem;
    margin-bottom: 0.5rem;
    font-size: 1.125rem;
}

.buying-guide h3:first-child {
    margin-top: 0;
}

.buying-guide p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.last-updated {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* FOOTER - Multi-column layout */
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    text-align: left;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: 0.25rem;
    display: inline-block;
}

.footer-tagline {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.footer-heading {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-primary);
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

/* MOBILE: stack footer columns */
@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-col:not(:first-child) {
        border-top: 1px solid var(--border-color);
        padding-top: 1rem;
    }
}

/* HOMEPAGE SCHEMA - ensure old footer still works on index */
footer .footer-container > p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* GUIDE SUMMARY TABLE */
.guide-summary-table {
    max-width: 700px;
    margin: 0 auto;
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    overflow: hidden;
}

.summary-row {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    padding: 0.875rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    gap: 1rem;
    align-items: center;
}

.summary-row:last-child {
    border-bottom: none;
}

.summary-row span:last-child {
    text-align: right;
    font-weight: 600;
    color: var(--accent-primary);
}

.summary-header {
    background-color: var(--bg-secondary);
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.summary-header span:last-child {
    color: var(--text-secondary);
    font-weight: 700;
}

.summary-total {
    background-color: var(--bg-secondary);
    font-weight: 700;
}

.summary-total span:first-child {
    color: var(--text-primary);
    font-weight: 700;
}

.summary-total span:last-child {
    font-size: 1.1rem;
    color: var(--accent-primary);
}

.summary-row span:nth-child(2) {
    color: var(--text-primary);
}

@media (max-width: 600px) {
    .summary-row {
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .summary-row span:nth-child(2) {
        display: none;
    }
}

/* COMING SOON CARD */
.category-card.coming-soon {
    opacity: 0.55;
    cursor: default;
    pointer-events: none;
}

.badge-coming-soon {
    display: inline-block;
    background: var(--text-secondary);
    color: var(--bg-primary);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.15rem 0.5rem;
    border-radius: 0.75rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    margin-left: 0.25rem;
    vertical-align: middle;
}

/* COMPARISON PAGE TABLE */
.comparison-table-wrap {
    overflow-x: auto;
    margin: 2rem 0;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 560px;
}

.comparison-table th {
    padding: 1rem 1.25rem;
    text-align: left;
    background-color: var(--bg-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.comparison-table th:first-child {
    width: 35%;
    color: var(--text-secondary);
}

.comparison-table td {
    padding: 0.875rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
    vertical-align: top;
}

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

.comparison-table tr:nth-child(even) td {
    background-color: var(--bg-secondary);
}

.comparison-table td:first-child {
    font-weight: 600;
    color: var(--text-primary);
}

.comparison-winner {
    color: var(--accent-primary) !important;
    font-weight: 600 !important;
}

/* VERDICT BOX */
.verdict-box {
    background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(139,92,246,0.08));
    border: 1px solid var(--accent-primary);
    border-radius: 0.75rem;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
}

.verdict-box h3 {
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.verdict-box p {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.verdict-box p:last-child {
    margin-bottom: 0;
}