/* 
   Vanilla Prepaid Canada SEO Guide - Global Stylesheet
   Design System: Premium Blue & Metallic Gold Accents
   Includes: Light/Dark Theme Support, Core Web Vital optimizations, Responsive Layouts
*/

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Theme Light (Default) */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --primary-color: #0f2b5c; /* Deep Royal Blue */
    --primary-light: #1e3a8a;
    --accent-gold: #d4af37; /* Premium Gold */
    --accent-gold-hover: #b8962e;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(15, 43, 92, 0.05), 0 4px 6px -2px rgba(15, 43, 92, 0.03);
    --shadow-premium: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);
    
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-border: rgba(226, 232, 240, 0.8);
    
    --danger-color: #dc2626;
    --danger-bg: #fef2f2;
    --danger-border: #fca5a5;
    
    --success-color: #16a34a;
    --success-bg: #f0fdf4;
    
    --warning-color: #d97706;
    --warning-bg: #fffbeb;
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --max-width: 1200px;
    --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    --header-height: 80px;
    --transition-speed: 0.3s;
}

[data-theme="dark"] {
    /* Theme Dark */
    --bg-primary: #090d16;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --primary-color: #1e3a8a;
    --primary-light: #3b82f6;
    --border-color: #374151;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    
    --card-bg: rgba(17, 24, 39, 0.8);
    --card-border: rgba(55, 65, 81, 0.5);
    
    --danger-color: #f87171;
    --danger-bg: #450a0a;
    --danger-border: #7f1d1d;
    
    --success-color: #4ade80;
    --success-bg: #064e3b;
    
    --warning-color: #fbbf24;
    --warning-bg: #78350f;
}

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

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    overflow-x: hidden;
}

/* Layout Containers */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

section {
    padding: 5rem 0;
}

/* Header & Navigation */
header {
    background-color: rgba(var(--bg-secondary), 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

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

.logo-wrapper {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 0.75rem;
}

.logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

[data-theme="dark"] .logo-text {
    color: #ffffff;
}

.logo-text span {
    color: var(--accent-gold);
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    transition: color var(--transition-speed);
    position: relative;
    padding: 0.5rem 0;
}

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

[data-theme="dark"] .nav-link:hover, [data-theme="dark"] .nav-link.active {
    color: var(--accent-gold);
}

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

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

/* Nav Actions (Theme & CTA) */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.theme-toggle:hover {
    background-color: var(--bg-tertiary);
    border-color: var(--accent-gold);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: block;
}

.cta-btn {
    background-color: var(--primary-color);
    color: #ffffff;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    border: 1px solid transparent;
}

[data-theme="dark"] .cta-btn {
    background-color: var(--accent-gold);
    color: #000000;
}

.cta-btn:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

[data-theme="dark"] .cta-btn:hover {
    background-color: var(--accent-gold-hover);
}

/* Mobile Menu Toggle */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.75rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, rgba(15, 43, 92, 0.05) 0%, rgba(212, 175, 55, 0.05) 100%);
    position: relative;
    padding: 6rem 0 8rem 0;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

[data-theme="dark"] .hero-content h1 {
    color: #ffffff;
}

.hero-content h1 span {
    color: var(--accent-gold);
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 540px;
}

.hero-btns {
    display: flex;
    gap: 1rem;
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-speed);
}

[data-theme="dark"] .btn-secondary {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: #ffffff;
}

[data-theme="dark"] .btn-secondary:hover {
    background-color: var(--accent-gold);
    color: #000000;
}

.hero-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
}

.hero-img {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-premium);
    transition: transform 0.5s ease-out;
}

.hero-image-wrapper:hover .hero-img {
    transform: translateY(-8px) scale(1.02);
}

/* Feature Grid Cards */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem auto;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

[data-theme="dark"] .section-header h2 {
    color: #ffffff;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

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

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed), border-color var(--transition-speed);
    display: flex;
    flex-direction: column;
    height: 100%;
    text-decoration: none;
    color: inherit;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-gold);
}

.card-icon {
    width: 54px;
    height: 54px;
    border-radius: var(--radius-md);
    background-color: rgba(15, 43, 92, 0.08);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

[data-theme="dark"] .card-icon {
    background-color: rgba(212, 175, 55, 0.15);
    color: var(--accent-gold);
}

.card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

[data-theme="dark"] .card h3 {
    color: #ffffff;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: 1.5rem;
}

.card-link {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

[data-theme="dark"] .card-link {
    color: var(--accent-gold);
}

.card-link svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-speed);
}

.card:hover .card-link svg {
    transform: translateX(4px);
}

/* Alert Box / Warning Callouts (E-E-A-T Focus) */
.alert-box {
    background-color: var(--danger-bg);
    border: 1px solid var(--danger-border);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin: 2rem 0;
    display: flex;
    gap: 1.25rem;
}

.alert-icon {
    font-size: 2rem;
    color: var(--danger-color);
    line-height: 1;
}

.alert-content h4 {
    color: var(--danger-color);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.alert-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

/* Security Notice / Callout (Light version) */
.callout-box {
    background-color: var(--warning-bg);
    border-left: 4px solid var(--warning-color);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    padding: 1.5rem;
    margin: 2rem 0;
}

.callout-box h4 {
    color: var(--warning-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.callout-box p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Article Layout & Typography */
.article-container {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 4rem;
    padding: 4rem 0;
}

.article-content h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

[data-theme="dark"] .article-content h1 {
    color: #ffffff;
}

.article-meta {
    display: flex;
    gap: 1.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 2.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.article-body {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.article-body p {
    margin-bottom: 1.75rem;
}

.article-body h2 {
    font-size: 1.85rem;
    color: var(--primary-color);
    margin: 3rem 0 1.25rem 0;
    font-weight: 700;
}

[data-theme="dark"] .article-body h2 {
    color: #ffffff;
}

.article-body h3 {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin: 2.25rem 0 1rem 0;
    font-weight: 600;
}

[data-theme="dark"] .article-body h3 {
    color: #ffffff;
}

.article-body ul, .article-body ol {
    margin-bottom: 1.75rem;
    padding-left: 2rem;
}

.article-body li {
    margin-bottom: 0.75rem;
}

.article-img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    margin: 2rem 0;
    box-shadow: var(--shadow-md);
}

/* Sidebar Navigation */
.sidebar-box {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    position: sticky;
    top: 100px;
    box-shadow: var(--shadow-sm);
}

.sidebar-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .sidebar-title {
    color: #ffffff;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 1rem;
}

.sidebar-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color var(--transition-speed);
}

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

[data-theme="dark"] .sidebar-link:hover, [data-theme="dark"] .sidebar-link.active {
    color: var(--accent-gold);
}

/* FAQ Accordion */
.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    overflow: hidden;
    transition: border-color var(--transition-speed);
}

.faq-item:hover {
    border-color: var(--accent-gold);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: none;
    border: none;
    text-align: left;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

[data-theme="dark"] .faq-question {
    color: #ffffff;
}

.faq-icon {
    transition: transform var(--transition-speed);
    font-size: 1.25rem;
    color: var(--text-muted);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--accent-gold);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-speed) ease-out, padding var(--transition-speed) ease-out;
    padding: 0 1.5rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 1.5rem 1.5rem 1.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

/* Tables styling */
.styled-table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.styled-table th {
    background-color: var(--primary-color);
    color: #ffffff;
    text-align: left;
    font-weight: 600;
    padding: 1rem 1.5rem;
}

[data-theme="dark"] .styled-table th {
    background-color: var(--bg-tertiary);
    color: var(--accent-gold);
}

.styled-table td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
}

.styled-table tr:last-of-type td {
    border-bottom: none;
}

/* Interactive Checklist (Scam Page) */
.safety-checklist {
    list-style: none !important;
    padding-left: 0 !important;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem !important;
    margin: 2rem 0;
}

.safety-checklist-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

[data-theme="dark"] .safety-checklist-title {
    color: #ffffff;
}

.checklist-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.25rem;
    cursor: pointer;
}

.checklist-item:last-of-type {
    margin-bottom: 0;
}

.checklist-checkbox {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
    flex-shrink: 0;
    margin-top: 3px;
}

.checklist-item.checked .checklist-checkbox {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.checklist-checkbox svg {
    width: 12px;
    height: 12px;
    fill: #ffffff;
    display: none;
}

.checklist-item.checked .checklist-checkbox svg {
    display: block;
}

.checklist-text h5 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.checklist-item.checked .checklist-text h5 {
    text-decoration: line-through;
    color: var(--text-muted);
}

.checklist-text p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0 !important;
}

/* Interactive Fee Calculator */
.calculator-box {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    margin: 3rem auto;
    max-width: 600px;
    box-shadow: var(--shadow-lg);
}

.calculator-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

[data-theme="dark"] .calculator-title {
    color: #ffffff;
}

.calc-group {
    margin-bottom: 1.5rem;
}

.calc-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.calc-select, .calc-input {
    width: 100%;
    padding: 0.85rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
    outline: none;
}

.calc-select:focus, .calc-input:focus {
    border-color: var(--accent-gold);
}

.calc-result {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.calc-result-val {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
}

[data-theme="dark"] .calc-result-val {
    color: var(--accent-gold);
}

.calc-result-lbl {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Contact Form */
.contact-form {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-control {
    width: 100%;
    padding: 0.85rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color var(--transition-speed);
}

.form-control:focus {
    border-color: var(--accent-gold);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

.submit-btn {
    background-color: var(--primary-color);
    color: #ffffff;
    border: none;
    padding: 0.85rem 2rem;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    width: 100%;
}

[data-theme="dark"] .submit-btn {
    background-color: var(--accent-gold);
    color: #000000;
}

.submit-btn:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
}

[data-theme="dark"] .submit-btn:hover {
    background-color: var(--accent-gold-hover);
}

/* Footer Section */
footer {
    background-color: #0c1424;
    color: #94a3b8;
    padding: 5rem 0 2rem 0;
    border-top: 1px solid #1e293b;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 3rem;
    margin-bottom: 4rem;
}

.footer-col h4 {
    color: #ffffff;
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.footer-col p {
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.95rem;
    transition: color var(--transition-speed);
}

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

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

/* Disclaimer text for E-E-A-T guidelines */
.disclaimer-text {
    font-size: 0.8rem;
    color: #64748b;
    line-height: 1.5;
    margin-top: 1rem;
}

/* Utilities */
.text-center { text-align: center; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }
.text-gold { color: var(--accent-gold); }

/* Responsive adjustments */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    .hero-content p {
        margin: 0 auto 2.5rem auto;
    }
    .hero-btns {
        justify-content: center;
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .article-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    .sidebar-box {
        position: static;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none; /* Handled dynamically by JS mobile menu toggle */
        position: absolute;
        top: var(--header-height);
        left: 0;
        width: 100%;
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: 2rem;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        gap: 1.5rem;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .grid-3, .grid-2, .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}