/* ============================================
   HOCl Guide — Mobile-First Styles
   ============================================ */

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

:root {
    /* Colors — accessible contrast ratios */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-secondary: #64748b;
    --color-text: #1e293b;
    --color-text-light: #475569;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --color-border: #e2e8f0;
    --color-success: #059669;
    --color-warning: #dc2626;
    
    /* Spacing rhythm */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, 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: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
    --nav-height: 60px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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);
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
}

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

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-lg);
}

h2 {
    font-size: var(--font-size-2xl);
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-lg);
}

h3 {
    font-size: var(--font-size-xl);
    margin-top: var(--space-lg);
}

h4 {
    font-size: var(--font-size-lg);
    margin-top: var(--space-md);
}

p {
    margin-bottom: var(--space-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

strong {
    font-weight: 600;
}

em {
    font-style: italic;
}

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

.container-narrow {
    max-width: var(--container-narrow);
}

/* ============================================
   Navigation — Sticky, Mobile-First
   ============================================ */
.nav {
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    height: var(--nav-height);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.nav-logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.nav-logo:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    width: 100%;
    height: 3px;
    background-color: var(--color-text);
    border-radius: 2px;
    transition: all 0.3s;
}

.nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    list-style: none;
    padding: var(--space-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    box-shadow: var(--shadow-md);
}

.nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

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

.nav-link {
    display: block;
    padding: var(--space-sm) 0;
    font-size: var(--font-size-base);
    color: var(--color-text);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s;
    line-height: var(--line-height-tight);
}

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

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}

.cta-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: var(--space-3xl) 0;
    text-align: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(37, 99, 235, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-md);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
    line-height: var(--line-height-relaxed);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   Cosmetics Badge
   ============================================ */
.cosmetics-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 4px rgba(5, 150, 105, 0.2);
}

/* ============================================
   Feature Grid
   ============================================ */
.features {
    padding: var(--space-2xl) 0;
}

.feature-grid {
    display: grid;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.feature-card {
    padding: var(--space-lg);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, transparent, rgba(37, 99, 235, 0.1));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s;
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: rgba(37, 99, 235, 0.2);
}

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

.feature-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    margin-top: 0;
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--color-text-light);
    margin-bottom: var(--space-md);
}

.feature-link {
    display: inline-block;
    font-weight: 600;
    color: var(--color-primary);
}

/* ============================================
   About Preview
   ============================================ */
.about-preview {
    padding: var(--space-2xl) 0;
    background-color: var(--color-bg-alt);
    text-align: center;
}

.about-preview h2 {
    margin-top: 0;
}

.about-preview p {
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   Article Styles
   ============================================ */
.article {
    padding: var(--space-2xl) 0;
}

.article-intro {
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    margin-bottom: var(--space-xl);
    line-height: var(--line-height-relaxed);
}

.article-section {
    margin-bottom: var(--space-2xl);
}

.article-list {
    margin-left: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.article-list li {
    margin-bottom: var(--space-sm);
    line-height: var(--line-height-relaxed);
}

/* ============================================
   Callouts
   ============================================ */
.callout {
    padding: var(--space-lg);
    border-left: 4px solid var(--color-primary);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.callout-warning {
    border-left-color: var(--color-warning);
}

.callout p {
    margin-bottom: 0;
}

/* ============================================
   Routine Steps
   ============================================ */
.routine-step {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
    padding: var(--space-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background-color: var(--color-bg-alt);
}

.routine-step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: white;
    font-size: var(--font-size-xl);
    font-weight: 700;
    border-radius: 50%;
}

.routine-step-content h3 {
    margin-top: 0;
}

.routine-step-content p:last-child {
    margin-bottom: 0;
}

/* ============================================
   Affiliate Disclosure
   ============================================ */
.affiliate-disclosure {
    padding: var(--space-lg);
    background-color: #fef3c7;
    border: 2px solid #f59e0b;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-2xl);
}

.affiliate-disclosure h3 {
    margin-top: 0;
    color: var(--color-text);
}

.affiliate-disclosure p {
    margin-bottom: 0;
}

.affiliate-disclosure a {
    font-weight: 600;
}

/* ============================================
   Picks Grid
   ============================================ */
.picks-grid {
    display: grid;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
}

.pick-card {
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    background-color: var(--color-bg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s;
}

.pick-card:hover {
    box-shadow: var(--shadow-md);
}

.pick-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background-color: var(--color-secondary);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.pick-card h3 {
    margin-top: var(--space-sm);
    margin-bottom: var(--space-md);
}

.pick-description {
    color: var(--color-text-light);
    margin-bottom: var(--space-lg);
}

.pick-details {
    padding: var(--space-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.pick-details-warning {
    background-color: #fef3c7;
    border: 1px solid #f59e0b;
}

.pick-details h4 {
    margin-top: 0;
    margin-bottom: var(--space-sm);
}

.pick-details ul {
    margin-left: var(--space-lg);
    margin-bottom: 0;
}

.pick-details li {
    margin-bottom: var(--space-xs);
}

.pick-shipping {
    padding: var(--space-md);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    background-color: #eff6ff;
}

.pick-shipping h4 {
    margin-top: 0;
}

.pick-note {
    font-weight: 600;
    color: var(--color-warning);
}

.pick-cta {
    text-align: center;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.pick-cta .btn {
    width: 100%;
    margin-bottom: var(--space-sm);
}

.pick-affiliate-note {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-top: var(--space-sm);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background-color: var(--color-text);
    color: white;
    padding: var(--space-2xl) 0 var(--space-md);
    margin-top: var(--space-3xl);
}

.footer-grid {
    display: grid;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
}

.footer-col h4 {
    color: white;
    font-size: var(--font-size-base);
    margin-bottom: var(--space-md);
    margin-top: 0;
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: var(--space-xs);
}

.footer-col a {
    color: #94a3b8;
    text-decoration: none;
}

.footer-col a:hover {
    color: white;
}

.footer-note {
    color: #94a3b8;
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.footer-bottom {
    padding-top: var(--space-lg);
    border-top: 1px solid #475569;
    text-align: center;
}

.footer-bottom p {
    color: #94a3b8;
    font-size: var(--font-size-sm);
    margin-bottom: 0;
}

/* ============================================
   Tablet Styles (min-width: 640px)
   ============================================ */
@media (min-width: 640px) {
    :root {
        --nav-height: 70px;
    }
    
    h1 {
        font-size: var(--font-size-4xl);
    }
    
    .hero {
        padding: var(--space-3xl) 0;
    }
    
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cta-group {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .routine-step {
        padding: var(--space-xl);
    }
}

/* ============================================
   Desktop Styles (min-width: 1024px)
   ============================================ */
@media (min-width: 1024px) {
    .container {
        padding: 0 var(--space-xl);
    }
    
    .nav-toggle {
        display: none;
    }
    
    .nav-menu {
        position: static;
        display: flex;
        gap: var(--space-lg);
        transform: none;
        opacity: 1;
        visibility: visible;
        padding: 0;
        border: none;
        box-shadow: none;
        background: transparent;
    }
    
    .nav-menu li {
        margin-bottom: 0;
    }
    
    .nav-link {
        padding: 0;
    }
    
    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .picks-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .pick-cta .btn {
        width: auto;
        padding-left: var(--space-xl);
        padding-right: var(--space-xl);
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .nav,
    .footer,
    .cta-group,
    .pick-cta {
        display: none;
    }
}