/* ============================================================
   ConvertMatrix — Main CSS Design System
   Premium SaaS-grade UI • Dark-first • Responsive
   ============================================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input, select, textarea { font: inherit; color: inherit; }
ul, ol { list-style: none; }

/* ===== CSS Custom Properties ===== */
body.dark-mode {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #a5b4fc;
    --color-primary-rgb: 99, 102, 241;
    --color-accent: #06b6d4;
    --color-accent-rgb: 6, 182, 212;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-bg: #0f0f13;
    --color-bg-card: #16161e;
    --color-bg-elevated: #1e1e2a;
    --color-bg-input: #12121a;
    --color-border: #2a2a38;
    --color-border-hover: #3a3a4e;
    --color-text: #e8e8f0;
    --color-text-muted: #8b8ba0;
    --color-text-dim: #5a5a70;
}

body:not(.dark-mode) {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-primary-rgb: 99, 102, 241;
    --color-accent: #0891b2;
    --color-accent-rgb: 8, 145, 178;
    --color-success: #059669;
    --color-warning: #d97706;
    --color-danger: #dc2626;
    --color-bg: #f8f9fc;
    --color-bg-card: #ffffff;
    --color-bg-elevated: #f0f1f5;
    --color-bg-input: #ffffff;
    --color-border: #e2e4ea;
    --color-border-hover: #c8cbd4;
    --color-text: #1a1a2e;
    --color-text-muted: #6b7280;
    --color-text-dim: #9ca3af;
}

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-md: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 2rem;
    --font-4xl: 2.5rem;
    --font-5xl: 3.5rem;

    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.15);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.2);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.3);
    --shadow-glow: 0 0 20px rgba(var(--color-primary-rgb), 0.3);
    --shadow-glow-lg: 0 0 40px rgba(var(--color-primary-rgb), 0.2);
}

/* ===== Body & Base ===== */
body {
    font-family: var(--font-sans);
    font-size: var(--font-md);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===== Layout ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

@media (max-width: 768px) {
    .container { padding: 0 var(--space-md); }
}

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

.section-alt {
    background: var(--color-bg-card);
}

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

h1 { font-size: var(--font-5xl); }
h2 { font-size: var(--font-3xl); }
h3 { font-size: var(--font-2xl); }
h4 { font-size: var(--font-xl); }

@media (max-width: 768px) {
    h1 { font-size: var(--font-3xl); }
    h2 { font-size: var(--font-2xl); }
    h3 { font-size: var(--font-xl); }
}

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

.section-title {
    font-size: var(--font-3xl);
    text-align: center;
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-muted);
    margin-bottom: var(--space-2xl);
    font-size: var(--font-lg);
}

code, pre, .mono {
    font-family: var(--font-mono);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
    border: 1px solid transparent;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #ffffff;
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(var(--color-primary-rgb), 0.3);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    filter: brightness(1.1);
}

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

.btn-secondary:hover {
    background: var(--color-bg-elevated);
    border-color: var(--color-border-hover);
}

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: var(--font-md);
    border-radius: var(--radius-lg);
}

.btn-sm {
    padding: 0.375rem 0.75rem;
    font-size: var(--font-xs);
}

.btn-icon {
    gap: 0.375rem;
}

/* ===== Cards ===== */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: all var(--transition-normal);
}

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

/* ===== Forms ===== */
.form-input, .form-select, textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus, .form-select:focus, textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.15);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%238b8ba0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

/* ===== Badges ===== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-full);
    font-size: var(--font-xs);
    font-weight: 600;
    letter-spacing: 0.02em;
}

.badge-primary {
    background: rgba(var(--color-primary-rgb), 0.15);
    color: var(--color-primary-light);
}

/* ===== Header ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(var(--color-bg, 15, 15, 19), 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-normal);
}

.dark-mode .site-header {
    background: rgba(15, 15, 19, 0.85);
}

body:not(.dark-mode) .site-header {
    background: rgba(248, 249, 252, 0.85);
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
    gap: var(--space-lg);
}

.nav-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.nav-logo .logo-icon { display: none; }

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    flex: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-text);
    background: var(--color-bg-elevated);
}

/* Nav Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 600px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--space-lg);
    z-index: 100;
}
.nav-dropdown:hover .nav-dropdown-content { display: block; }
.dropdown-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}
.dropdown-heading {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--font-sm);
    font-weight: 600;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}
.dropdown-links {
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.dropdown-links a {
    font-size: var(--font-xs);
    color: var(--color-text-muted);
    padding: 3px 0;
    transition: color var(--transition-fast);
}
.dropdown-links a:hover { color: var(--color-primary); }

/* Nav Actions */
.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-icon {
    position: absolute;
    left: 0.75rem;
    pointer-events: none;
    color: var(--color-text-dim);
}

.search-input {
    width: 200px;
    padding: 0.5rem 0.75rem 0.5rem 2.25rem;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-sm);
    color: var(--color-text);
    outline: none;
    transition: all var(--transition-fast);
}

.search-input:focus {
    width: 280px;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

.search-results {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 320px;
    overflow-y: auto;
    z-index: 200;
}

.search-result-item {
    display: block;
    padding: 0.625rem 0.875rem;
    font-size: var(--font-sm);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.search-result-item:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--color-bg-elevated);
    color: var(--color-text);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 4px 0;
}

.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Header Mobile ===== */
@media (max-width: 768px) {
    .nav-logo .logo-full { display: none; }
    .nav-logo .logo-icon { display: block; }
    .nav-toggle { display: flex; }
    .search-input { width: 140px; }
    .search-input:focus { width: 180px; }
    .nav-links {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        background: var(--color-bg);
        padding: var(--space-lg);
        gap: var(--space-sm);
        overflow-y: auto;
        z-index: 999;
    }
    .nav-links.active { display: flex; }
    .nav-dropdown-content {
        position: static;
        min-width: auto;
        border: none;
        box-shadow: none;
        padding: var(--space-sm);
    }
    .dropdown-grid { grid-template-columns: 1fr; }
}

/* ===== Main Content Offset ===== */
#main-content {
    padding-top: 64px;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    padding: var(--space-3xl) 0;
    text-align: center;
    overflow: hidden;
}

.hero-bg-animation {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(var(--color-primary-rgb), 0.12) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(var(--color-accent-rgb), 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(var(--color-primary-rgb), 0.06) 0%, transparent 60%);
    animation: gradientShift 8s ease-in-out infinite alternate;
    z-index: 0;
}

@keyframes gradientShift {
    0% { transform: scale(1) rotate(0deg); opacity: 1; }
    100% { transform: scale(1.1) rotate(2deg); opacity: 0.8; }
}

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

.hero-title {
    font-size: var(--font-5xl);
    font-weight: 800;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: var(--font-lg);
    color: var(--color-text-muted);
    max-width: 680px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

.hero-cta {
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 2px 8px rgba(var(--color-primary-rgb), 0.3); }
    50% { box-shadow: 0 4px 20px rgba(var(--color-primary-rgb), 0.5); }
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    margin-top: var(--space-2xl);
}

.hero-stats .stat {
    text-align: center;
}

.hero-stats .stat strong {
    display: block;
    font-size: var(--font-3xl);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-stats .stat span {
    font-size: var(--font-sm);
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .hero { padding: var(--space-2xl) 0; }
    .hero-title { font-size: var(--font-3xl); }
    .hero-stats { gap: var(--space-lg); }
    .hero-stats .stat strong { font-size: var(--font-2xl); }
}

/* ===== Quick Converter ===== */
.quick-converter-widget {
    display: flex;
    align-items: flex-end;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
}

.quick-converter-select {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    min-width: 200px;
}

.quick-converter-select label {
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--color-text-muted);
}

.quick-converter-arrow {
    color: var(--color-primary);
    padding-bottom: 0.5rem;
}

@media (max-width: 640px) {
    .quick-converter-widget { flex-direction: column; align-items: stretch; }
    .quick-converter-arrow { align-self: center; transform: rotate(90deg); }
    .quick-converter-select { min-width: auto; }
}

/* ===== Format Browser ===== */
.format-browser {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--space-md);
}

.format-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    text-align: center;
}

.format-card:hover {
    transform: translateY(-4px);
    border-color: var(--format-color, var(--color-primary));
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.format-card-name { font-weight: 600; font-size: var(--font-sm); }
.format-card-ext { font-size: var(--font-xs); color: var(--color-text-dim); }

/* ===== Popular Grid ===== */
.popular-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-md);
}

.tool-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    text-align: center;
}

.tool-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

.tool-card-icons {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.tool-card-arrow { color: var(--color-primary); }
.tool-card-title { font-weight: 600; font-size: var(--font-sm); }

/* ===== Tools Matrix ===== */
.tools-matrix-wrapper {
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.tools-matrix {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-xs);
}

.tools-matrix th, .tools-matrix td {
    padding: 0.375rem 0.5rem;
    border: 1px solid var(--color-border);
    text-align: center;
    white-space: nowrap;
}

.tools-matrix thead th {
    background: var(--color-bg-elevated);
    position: sticky;
    top: 0;
    z-index: 2;
    font-weight: 600;
}

.tools-matrix thead th img {
    display: inline-block;
    margin: 0 auto 2px;
}

.matrix-corner {
    position: sticky;
    left: 0;
    z-index: 3;
    background: var(--color-bg-elevated);
    font-weight: 700;
    text-align: left !important;
    min-width: 100px;
}

.matrix-row-header {
    position: sticky;
    left: 0;
    z-index: 1;
    background: var(--color-bg-card);
    font-weight: 600;
    text-align: left !important;
    white-space: nowrap;
}

.matrix-row-header img {
    display: inline-block;
    vertical-align: middle;
    margin-right: 4px;
}

.matrix-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    color: var(--color-success);
    font-weight: 700;
    transition: all var(--transition-fast);
}

.matrix-link:hover {
    background: rgba(var(--color-primary-rgb), 0.15);
    color: var(--color-primary);
    transform: scale(1.2);
}

.matrix-empty {
    color: var(--color-text-dim);
    opacity: 0.3;
}

/* ===== Features ===== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.feature-card {
    text-align: center;
    padding: var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    background: var(--color-bg-elevated);
    margin-bottom: var(--space-md);
}

.feature-card h3 {
    font-size: var(--font-xl);
    margin-bottom: var(--space-sm);
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: var(--font-sm);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .features-grid { grid-template-columns: 1fr; }
}

/* ===== Blog Cards ===== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.blog-grid-list {
    grid-template-columns: repeat(2, 1fr);
}

.blog-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.blog-card:hover {
    transform: translateY(-3px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.blog-card-title {
    font-size: var(--font-lg);
    font-weight: 700;
    line-height: 1.3;
}

.blog-card-excerpt {
    color: var(--color-text-muted);
    font-size: var(--font-sm);
    line-height: 1.6;
    flex: 1;
}

.blog-card-meta {
    display: flex;
    gap: var(--space-sm);
    font-size: var(--font-xs);
    color: var(--color-text-dim);
}

@media (max-width: 768px) {
    .blog-grid, .blog-grid-list { grid-template-columns: 1fr; }
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    padding: var(--space-md) 0;
    font-size: var(--font-sm);
    color: var(--color-text-muted);
}

.breadcrumb a {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

.breadcrumb-sep {
    margin: 0 var(--space-sm);
    opacity: 0.5;
}

/* ===== Footer ===== */
.site-footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    background: var(--color-bg-card);
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-3xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-2xl);
}

.footer-logo { margin-bottom: var(--space-md); display: inline-block; }

.footer-about {
    color: var(--color-text-muted);
    font-size: var(--font-sm);
    line-height: 1.7;
}

.footer-heading {
    font-size: var(--font-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

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

.footer-links a {
    font-size: var(--font-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
}

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

.footer-bottom {
    margin-top: var(--space-2xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-dim);
    font-size: var(--font-sm);
}

.footer-bottom-links {
    margin-top: var(--space-sm);
    font-size: var(--font-xs);
}

.footer-bottom-links a {
    color: var(--color-text-dim);
    transition: color var(--transition-fast);
}

.footer-bottom-links a:hover { color: var(--color-primary); }
.footer-bottom-links span { margin: 0 var(--space-xs); }

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .footer-grid { grid-template-columns: 1fr; }
}

/* ===== 404 Page ===== */
.error-page {
    padding: var(--space-3xl) 0;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.error-code {
    font-size: 8rem;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--space-md);
}

.error-title { font-size: var(--font-3xl); margin-bottom: var(--space-md); }
.error-message { color: var(--color-text-muted); margin-bottom: var(--space-xl); font-size: var(--font-lg); }
.error-search { max-width: 400px; margin: 0 auto var(--space-xl); }
.error-actions { display: flex; gap: var(--space-md); justify-content: center; margin-bottom: var(--space-2xl); }
.error-popular h3 { margin-bottom: var(--space-md); }
.error-popular .popular-grid { justify-content: center; display: flex; flex-wrap: wrap; gap: var(--space-sm); }

/* ===== Utilities ===== */
.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); }
.mt-5 { margin-top: var(--space-2xl); }
.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); }
.mb-5 { margin-bottom: var(--space-2xl); }
.hidden { display: none !important; }
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    border: 0;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.animate-fade-in { animation: fadeIn 0.5s ease forwards; }
.animate-slide-up { animation: slideUp 0.6s ease forwards; }

/* ===== Blog List Hero ===== */
.blog-list-hero {
    padding: var(--space-2xl) 0;
    text-align: center;
    background: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
}

.blog-list-hero .hero-title { font-size: var(--font-4xl); }

/* ===== Ad Container ===== */
.ad-container {
    max-width: var(--container-max);
    margin: var(--space-lg) auto;
    padding: 0 var(--space-md);
    text-align: center;
    min-height: 90px;
    overflow: hidden;
}

.ad-container ins {
    border-radius: var(--radius-md);
}

@media (max-width: 768px) {
    .ad-container {
        margin: var(--space-md) auto;
        padding: 0 var(--space-sm);
    }
}

/* ===== Article Tools CTA ===== */
.article-tools-cta {
    margin-top: var(--space-2xl);
    padding: var(--space-lg);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.article-tools-cta h3 {
    font-size: var(--font-xl);
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}

.article-tools-cta p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

/* ===== Utility Spacing ===== */
.mt-5 { margin-top: var(--space-2xl); }
.mt-4 { margin-top: var(--space-xl); }
.mt-3 { margin-top: var(--space-lg); }
.text-center { text-align: center; }