/**
 * TechRank Tools - Primary Theme Stylesheet
 *
 * Design System: High-contrast, Accessible (WCAG AA), Modern Dark/Light Theme with Fluid Typography
 */

:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    
    /* Light Mode Tokens */
    --bg-page: #F8FAFC;
    --bg-surface: #FFFFFF;
    --bg-surface-elevated: #FFFFFF;
    --bg-surface-subtle: #F1F5F9;
    --border-color: #E2E8F0;
    --border-color-focus: #6366F1;
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    --text-inverse: #FFFFFF;
    
    --brand-primary: #6366F1;
    --brand-primary-hover: #4F46E5;
    --brand-secondary: #EC4899;
    --brand-accent: #06B6D4;
    
    --success: #10B981;
    --warning: #F59E0B;
    --error: #EF4444;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    --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-glow: 0 0 25px rgba(99, 102, 241, 0.25);
    
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-page: #0B0F19;
    --bg-surface: #111827;
    --bg-surface-elevated: #1F2937;
    --bg-surface-subtle: #1E293B;
    --border-color: #334155;
    --border-color-focus: #818CF8;
    
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --text-inverse: #0F172A;
    
    --brand-primary: #818CF8;
    --brand-primary-hover: #6366F1;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(129, 140, 248, 0.3);
}

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

html {
    overflow-x: hidden;
    width: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-page);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

body.nav-drawer-open {
    overflow: hidden;
}

input, button, select, textarea {
    font-family: inherit;
    font-size: 1rem;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Accessibility */
:focus-visible {
    outline: 2px solid var(--border-color-focus);
    outline-offset: 3px;
}

.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    width: 1px;
    word-wrap: normal !important;
}

/* Layout Containers */
.site-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.site-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.site-main {
    flex: 1;
}

.text-center {
    text-align: center;
}

/* Top Announcement Bar */
.announcement-bar {
    background: linear-gradient(90deg, #4F46E5, #9333EA, #EC4899);
    color: #FFFFFF;
    font-size: 0.875rem;
    padding: 0.5rem 0;
}

.announcement-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    text-align: center;
}

.announcement-badge {
    background: rgba(255, 255, 255, 0.25);
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
}

.announcement-link {
    color: #FFFFFF;
    font-weight: 700;
    text-decoration: underline;
    margin-left: 0.25rem;
}

/* Navigation Header */
.site-header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    transition: var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
    font-size: 1.35rem;
    text-decoration: none;
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #6366F1, #EC4899);
    color: #FFFFFF;
    border-radius: var(--radius-md);
}

.brand-accent {
    color: var(--brand-primary);
    font-weight: 800;
}

.main-navigation {
    display: flex;
    align-items: center;
}

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

.nav-menu a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0.25rem;
    position: relative;
}

.nav-menu a:hover {
    color: var(--brand-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    border-radius: var(--radius-md);
    background: var(--bg-surface-subtle);
    color: var(--text-secondary);
    transition: var(--transition);
}

.theme-toggle-btn:hover {
    color: var(--brand-primary);
    background: var(--border-color);
}

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    padding: 10px;
    border-radius: var(--radius-md);
    background: var(--bg-surface-subtle);
    color: var(--text-primary);
    transition: var(--transition);
}

.hamburger-bar {
    width: 22px;
    height: 2.5px;
    background-color: currentColor;
    border-radius: 2px;
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease;
    transform-origin: center;
}

.mobile-toggle.is-active .hamburger-bar:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.mobile-toggle.is-active .hamburger-bar:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.mobile-toggle.is-active .hamburger-bar:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* Footer */
.site-footer {
    background-color: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
    margin-top: 4rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1.2fr 1.2fr 1.2fr;
    gap: 3rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.footer-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.footer-features-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.badge-item {
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--bg-surface-subtle);
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.footer-heading {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--brand-primary);
    padding-left: 4px;
}

.footer-smm-link {
    color: #EC4899 !important;
    font-weight: 700;
}

.footer-disclaimer-box {
    margin-top: 3rem;
    padding: 1.25rem;
    background: var(--bg-surface-subtle);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-bottom {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-menu {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.footer-menu a {
    color: var(--text-muted);
}

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

/* Generic Page, Blog Post & 404 Styles */
.generic-page-content {
    padding: 3.5rem 0;
    max-width: 860px;
    margin: 0 auto;
}

.single-post-entry, .page-entry {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-sm);
}

.entry-header {
    margin-bottom: 2rem;
}

.entry-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.25;
    margin-bottom: 0.75rem;
}

.post-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.single-post-thumbnail {
    margin-bottom: 2rem;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.entry-content {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.entry-content p, .entry-content ul, .entry-content ol {
    margin-bottom: 1.5rem;
}

.entry-footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.post-tags span {
    font-weight: 700;
    color: var(--text-primary);
}

.posts-list-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.post-summary-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.post-card-content {
    padding: 1.5rem;
    flex: 1;
}

.error-404-box {
    padding: 4rem 1.5rem;
    max-width: 600px;
    margin: 0 auto;
}

.error-code {
    font-size: clamp(4rem, 10vw, 7rem);
    font-weight: 900;
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    display: block;
    margin-bottom: 1rem;
}

.error-title {
    font-size: clamp(1.5rem, 3vw, 2.25rem);
    font-weight: 800;
    margin-bottom: 1rem;
}

.error-message {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.error-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Responsive Media Queries */
@media (max-width: 991px) {
    .site-container {
        padding: 0 1.25rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 2.5rem;
    }
}

@media (max-width: 768px) {
    .header-inner {
        height: 64px;
    }
    
    .brand-link {
        font-size: 1.2rem;
    }
    
    .brand-icon {
        width: 36px;
        height: 36px;
    }
    
    .brand-icon svg {
        width: 22px;
        height: 22px;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .main-navigation {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg-surface);
        border-bottom: 2px solid var(--border-color);
        padding: 1rem 1.25rem 2rem;
        display: none;
        flex-direction: column;
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        max-height: calc(100vh - 64px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        z-index: 99;
        transform: translateY(-8px);
        opacity: 0;
        transition: transform 0.25s ease, opacity 0.25s ease;
    }
    
    .main-navigation.is-open {
        display: flex;
        transform: translateY(0);
        opacity: 1;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        gap: 0.25rem;
        align-items: stretch;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-menu a {
        display: flex;
        align-items: center;
        width: 100%;
        min-height: 44px;
        padding: 0.75rem 1rem;
        border-radius: var(--radius-md);
        font-size: 1rem;
        font-weight: 600;
        color: var(--text-primary);
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu a:hover, .nav-menu a:focus {
        background: var(--bg-surface-subtle);
        color: var(--brand-primary);
        padding-left: 1.25rem;
    }
    
    .announcement-bar {
        font-size: 0.78rem;
        padding: 0.4rem 0.5rem;
    }
    
    .announcement-content {
        gap: 0.35rem;
        justify-content: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .footer-menu {
        justify-content: center;
        flex-wrap: wrap;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .site-container {
        padding: 0 1rem;
    }
    
    .brand-link {
        font-size: 1.1rem;
        gap: 0.35rem;
    }
    
    .brand-icon {
        width: 32px;
        height: 32px;
    }
    
    .brand-icon svg {
        width: 20px;
        height: 20px;
    }
    
    .header-actions {
        gap: 0.5rem;
    }
    
    .theme-toggle-btn, .mobile-toggle {
        width: 44px;
        height: 44px;
        min-width: 44px;
        min-height: 44px;
    }
    
    .announcement-text {
        font-size: 0.75rem;
    }
    
    .announcement-badge {
        font-size: 0.7rem;
        padding: 0.1rem 0.45rem;
    }
}

@media (max-width: 360px) {
    .site-container {
        padding: 0 0.75rem;
    }
    
    .brand-link span.brand-text {
        font-size: 1rem;
    }
}

/* ==========================================================================
   Breadcrumb Navigation (Accessible & Responsive)
   ========================================================================== */
.breadcrumb-nav, .tool-breadcrumbs-bar {
    margin: 1.25rem 0;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.breadcrumb-list, .breadcrumb-trail {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.breadcrumb-list a, .breadcrumb-trail a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.breadcrumb-list a:hover, .breadcrumb-trail a:hover {
    color: var(--brand-primary);
    text-decoration: underline;
}

.breadcrumb-separator, .breadcrumb-trail .sep {
    color: var(--text-muted);
    user-select: none;
}

.breadcrumb-list .current, .breadcrumb-trail .current {
    color: var(--text-primary);
    font-weight: 600;
}

/* ==========================================================================
   Custom 404 Page Architecture
   ========================================================================== */
.custom-404-container {
    padding: 3rem 1.5rem 5rem;
}

.error-hero-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 3.5rem 2rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 3.5rem;
    position: relative;
    overflow: hidden;
}

.error-badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.25);
    padding: 0.35rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: #ef4444;
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.error-code-headline {
    font-size: clamp(5rem, 15vw, 9rem);
    font-weight: 900;
    line-height: 1;
    margin: 0;
    background: linear-gradient(135deg, var(--brand-primary) 0%, #a855f7 50%, #ec4899 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.05em;
}

.error-subtitle {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--text-primary);
    margin: 1rem 0;
}

.error-lead {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 2rem;
    line-height: 1.6;
}

.error-search-wrapper {
    max-width: 580px;
    margin: 0 auto 2rem;
}

.error-input-group {
    display: flex;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 0.35rem;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.error-input-group:focus-within {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.error-url-input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
    color: var(--text-primary);
    outline: none;
}

.btn-error-submit {
    background: linear-gradient(135deg, var(--brand-primary), var(--brand-hover));
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
    white-space: nowrap;
}

.btn-error-submit:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.platform-chips-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    margin-top: 1.5rem;
}

.chips-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
}

.platform-chips-row .platform-chip {
    text-decoration: none;
    font-size: 0.8rem;
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-full);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.platform-chips-row .platform-chip:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.error-popular-tools {
    margin-top: 3rem;
}

.error-footer-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 3rem;
}

/* ==========================================================================
   Privacy Policy & Legal Content Styling
   ========================================================================== */
.privacy-policy-container {
    padding: 2.5rem 1.5rem 5rem;
}

.privacy-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 3rem 2.5rem;
    box-shadow: var(--shadow-sm);
    margin-bottom: 3rem;
}

.privacy-card .entry-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 2rem;
    margin-bottom: 2.5rem;
}

.privacy-card .entry-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--text-primary);
    margin: 0.75rem 0 0.5rem;
}

.privacy-card .last-updated {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.legal-section {
    margin-bottom: 2.5rem;
}

.legal-section h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.legal-section p, .legal-section li {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

.legal-section ul {
    padding-left: 1.5rem;
    margin: 1rem 0;
}

.legal-section li {
    margin-bottom: 0.5rem;
}

.legal-section.highlight-box {
    background: var(--bg-secondary);
    border-left: 4px solid var(--brand-primary);
    border-radius: var(--radius-md);
    padding: 1.5rem 2rem;
    margin: 2rem 0;
}

.contact-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-top: 1rem;
}

.contact-box p {
    margin: 0.35rem 0;
}

@media (max-width: 640px) {
    .error-input-group {
        flex-direction: column;
        border-radius: var(--radius-lg);
        padding: 0.5rem;
    }
    
    .btn-error-submit {
        width: 100%;
        border-radius: var(--radius-md);
    }
    
    .privacy-card {
        padding: 2rem 1.25rem;
    }
}