/* CSS Variables */
:root {
    --primary-color: #5167FA;
    --primary-dark: #3d4fd6;
    --primary-light: #eef0ff;
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #7a7a9a;
    --background: #ffffff;
    --background-light: #f8fafb;
    --border-color: #e8eaed;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
    --max-width: 1200px;
}

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

/* Base Styles */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--background);
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 18px;
    color: var(--text-primary);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition);
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--background);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    z-index: 99;
}

.mobile-menu.active {
    display: block;
}

.mobile-nav-link {
    display: block;
    padding: 12px 0;
    color: var(--text-secondary);
    font-weight: 500;
    border-bottom: 1px solid var(--border-color);
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

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

/* Hero Section */
.hero {
    background: var(--background-light);
    padding: 48px 24px 64px;
    text-align: center;
}

.hero-container {
    max-width: 720px;
    margin: 0 auto;
}

.hero-image {
    max-width: 300px;
    margin: 0 auto 24px;
}

.hero-image svg {
    width: 100%;
    height: auto;
}

.hero-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

/* Search Box */
.search-container {
    position: relative;
    max-width: 480px;
    margin: 0 auto;
}

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

.search-icon {
    position: absolute;
    left: 16px;
    width: 20px;
    height: 20px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 14px 44px 14px 48px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--background);
    transition: all var(--transition);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.search-clear {
    position: absolute;
    right: 12px;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: color var(--transition);
}

.search-clear:hover {
    color: var(--text-primary);
}

.search-clear svg {
    width: 18px;
    height: 18px;
}

/* Search Results */
.search-results {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 8px;
    background: var(--background);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    max-height: 400px;
    overflow-y: auto;
    display: none;
    z-index: 50;
    text-align: left;
}

.search-results.active {
    display: block;
}

.search-result-item {
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition);
}

.search-result-item:last-child {
    border-bottom: none;
}

.search-result-item:hover,
.search-result-item.active {
    background: var(--primary-light);
}

.search-result-category {
    font-size: 12px;
    color: var(--primary-color);
    font-weight: 500;
    margin-bottom: 4px;
}

.search-result-title {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.search-result-title mark {
    background: #fff3cd;
    padding: 0 2px;
    border-radius: 2px;
}

.search-no-results {
    padding: 24px 16px;
    text-align: center;
    color: var(--text-muted);
}

/* Main Content */
.main-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 48px 24px;
}

.section-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 40px;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px 48px;
}

.category {
    min-width: 0;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.category-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
    flex-shrink: 0;
}

.category-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.article-link {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    padding: 4px 0;
    transition: color var(--transition);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.article-link:hover {
    color: var(--primary-color);
}

/* Hidden articles - collapsed by default */
.hidden-article {
    display: none;
}

.category.expanded .hidden-article {
    display: block;
}

.show-toggle {
    margin-top: 12px;
    font-size: 14px;
    color: var(--primary-color);
    font-weight: 500;
    transition: opacity var(--transition);
}

.show-toggle:hover {
    opacity: 0.8;
}

/* Still Need Help Section */
.still-need-help {
    text-align: center;
    padding: 64px 24px;
    margin-top: 48px;
    background: var(--background-light);
    border-radius: var(--radius-lg);
}

.help-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.help-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.help-contact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.email-icon {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
}

.email-link {
    color: var(--text-primary);
    font-weight: 500;
}

.email-link:hover {
    color: var(--primary-color);
}

.submit-btn {
    display: inline-block;
    padding: 14px 32px;
    background: var(--text-primary);
    color: white;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    z-index: 200;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--background);
    border-radius: var(--radius-lg);
    max-width: 720px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    background: var(--background-light);
    border-radius: 50%;
    transition: all var(--transition);
    z-index: 10;
}

.modal-close:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.modal-close svg {
    width: 20px;
    height: 20px;
}

.modal-content {
    padding: 32px;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    margin-bottom: 16px;
}

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

.breadcrumb-link:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    color: var(--text-muted);
}

.breadcrumb-current {
    color: var(--text-muted);
}

.modal-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    padding-right: 40px;
}

.modal-body {
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.modal-body h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 24px 0 12px;
}

.modal-body h2:first-child {
    margin-top: 0;
}

.modal-body p {
    margin-bottom: 16px;
}

.modal-body ul,
.modal-body ol {
    margin: 16px 0;
    padding-left: 24px;
}

.modal-body li {
    margin-bottom: 8px;
}

.modal-body ol {
    list-style: decimal;
}

.modal-body ul {
    list-style: disc;
}

.modal-body strong {
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body code {
    background: var(--background-light);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 13px;
}

.modal-body a {
    color: var(--primary-color);
    text-decoration: underline;
}

.modal-body a:hover {
    text-decoration: none;
}

/* Info Box */
.info-box {
    background: var(--primary-light);
    border-left: 4px solid var(--primary-color);
    padding: 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 16px 0;
}

.info-box p {
    margin: 0;
}

.warning-box {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 16px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 16px 0;
}

.warning-box p {
    margin: 0;
}

/* Article Feedback */
.article-feedback {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.feedback-question {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.feedback-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
}

.feedback-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

.feedback-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.feedback-btn.selected {
    background: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.feedback-btn svg {
    width: 18px;
    height: 18px;
}

/* Footer */
.footer {
    background: #ffffff;
    color: var(--text-secondary);
    padding: 48px 24px 24px;
    border-top: 1px solid var(--border-color);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border-color);
}

.footer-brand {
    max-width: 280px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.footer-logo .logo-icon {
    background: var(--primary-color);
}

.footer-logo .logo-text {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 18px;
}

.footer-tagline {
    font-size: 14px;
    color: var(--text-muted);
}

.footer-address {
    font-style: normal;
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--text-muted);
    transition: color var(--transition);
}

.social-link:hover {
    color: var(--primary-color);
}

.social-link svg {
    width: 22px;
    height: 22px;
}

.footer-links {
    display: flex;
    gap: 64px;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-heading {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.footer-link {
    font-size: 14px;
    color: var(--text-muted);
    transition: color var(--transition);
}

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

.footer-bottom {
    max-width: var(--max-width);
    margin: 0 auto;
    padding-top: 24px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

.disclaimer {
    margin-top: 8px;
    font-size: 12px;
}

/* Responsive - Tablet */
@media (max-width: 960px) {
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
    }

    .footer-links {
        gap: 40px;
    }
}

/* Responsive - Mobile */
@media (max-width: 640px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero {
        padding: 32px 16px 48px;
    }

    .hero-image {
        max-width: 240px;
    }

    .hero-title {
        font-size: 24px;
    }

    .search-input {
        padding: 12px 40px 12px 44px;
        font-size: 15px;
    }

    .main-content {
        padding: 32px 16px;
    }

    .section-title {
        font-size: 20px;
        margin-bottom: 32px;
    }

    .categories-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .category-title {
        font-size: 15px;
    }

    .article-link {
        font-size: 14px;
        padding: 6px 0;
    }

    .still-need-help {
        padding: 40px 16px;
        margin-top: 32px;
    }

    .help-title {
        font-size: 20px;
    }

    .help-subtitle {
        font-size: 14px;
    }

    .modal {
        margin: 0;
        border-radius: var(--radius-md) var(--radius-md) 0 0;
        max-height: 95vh;
        position: fixed;
        bottom: 0;
    }

    .modal-content {
        padding: 24px 16px;
    }

    .modal-title {
        font-size: 20px;
    }

    .footer-container {
        flex-direction: column;
        gap: 32px;
    }

    .footer-brand {
        max-width: 100%;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 32px;
    }

    .footer-column {
        min-width: 120px;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-light);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Focus Styles for Accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .navbar,
    .search-container,
    .show-toggle,
    .still-need-help,
    .footer,
    .modal-close,
    .article-feedback {
        display: none !important;
    }

    .modal-overlay {
        position: static;
        background: none;
        padding: 0;
    }

    .modal {
        max-height: none;
        box-shadow: none;
    }
}