@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --background-dark: #f8fafc;
    --background-card: #ffffff;
    --background-input: #f1f5f9;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--background-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

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

ul {
    list-style: none;
}

/* Header Styles */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
    gap: 30px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    color: var(--primary-color);
    font-size: 1.8rem;
}

.nav-links {
    display: flex;
    gap: 35px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.nav-links a:hover::after,
.nav-links li.active a::after {
    width: 100%;
}

.nav-links li.active a {
    color: var(--primary-color);
}

.search-bar {
    display: flex;
    background: var(--background-input);
    border-radius: 25px;
    padding: 8px 15px;
    gap: 10px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.search-bar:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.search-bar input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    width: 200px;
    font-size: 0.9rem;
}

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

.search-bar button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.search-bar button:hover {
    color: var(--primary-color);
}

.hamburger {
    display: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: 150px 0 100px;
    text-align: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e0e7ff 50%, #f0fdf4 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 15px 35px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--background-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Translator Section */
.translator-section {
    padding: 60px 0;
    background: var(--background-dark);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.section-more {
    color: var(--primary-light);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.section-more:hover {
    gap: 12px;
}

.translator-card {
    background: var(--background-card);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.translator-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: stretch;
}

.translator-box {
    display: flex;
    flex-direction: column;
    background: var(--background-input);
    border-radius: 15px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.translator-box:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.translator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
    border-bottom: 1px solid var(--border-color);
}

.language-selector {
    display: flex;
    align-items: center;
    gap: 10px;
}

.language-selector select {
    background: var(--background-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 35px 8px 15px;
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
}

.translator-actions {
    display: flex;
    gap: 10px;
}

.translator-actions button.action-btn {
    background: var(--background-input);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.translator-actions button.action-btn i {
    font-size: 14px;
}

.translator-actions button.action-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.swap-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    align-self: center;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 700;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.swap-btn span {
    font-size: 1rem;
    font-weight: 700;
}

.swap-btn:hover {
    transform: rotate(180deg) scale(1.1);
}

.translator-content {
    flex: 1;
    padding: 20px;
}

.translator-content textarea {
    width: 100%;
    height: 200px;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 1.1rem;
    resize: none;
    font-family: inherit;
    line-height: 1.8;
}

.translator-content textarea::placeholder {
    color: var(--text-muted);
}

.translator-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
}

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

.translate-btn {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 10px 25px;
    border-radius: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.translate-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.translate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Features Section */
.features-section {
    padding: 80px 0;
    background: linear-gradient(180deg, var(--background-dark) 0%, #f0fdf4 100%);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--background-card);
    border-radius: 20px;
    padding: 35px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-light);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    font-size: 2.5rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* Languages Section */
.languages-section {
    padding: 80px 0;
    background: var(--background-dark);
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.language-card {
    background: var(--background-card);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
}

.language-card:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    transform: translateY(-3px);
}

.language-card i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.language-card h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.language-card span {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* History Section */
.history-section {
    padding: 60px 0;
    background: linear-gradient(180deg, var(--background-dark) 0%, #fef3c7 100%);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--background-card);
    padding: 20px 25px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    cursor: pointer;
}

.history-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.history-lang {
    display: flex;
    align-items: center;
    gap: 15px;
    min-width: 150px;
}

.history-lang span {
    font-weight: 600;
    color: var(--text-primary);
}

.history-lang i {
    color: var(--primary-color);
}

.history-content {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.history-original {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.history-translated {
    color: var(--primary-dark);
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.6;
}

.history-time {
    font-size: 0.85rem;
    color: var(--text-muted);
    min-width: 100px;
    text-align: right;
}

/* Latest Articles Section */
.latest-articles-section {
    padding: 80px 0;
    background: var(--background-card);
}

.latest-articles-section .section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 35px;
}

.latest-articles-section .section-title {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-primary);
}

.latest-articles-section .section-more {
    color: var(--primary-color);
    font-size: 0.95rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.latest-articles-section .section-more:hover {
    color: var(--primary-dark);
    gap: 12px;
}

.latest-articles-section .section-more i {
    font-size: 0.85rem;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.article-card {
    background: var(--background-dark);
    border-radius: 16px;
    padding: 25px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.article-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.article-card h3 {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: var(--transition);
}

.article-card:hover h3 {
    color: var(--primary-color);
}

.article-card .article-intro {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 15px;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card .article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
    padding-top: 15px;
    border-top: 1px solid var(--border-color);
}

.article-card .article-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.article-card .article-meta i {
    font-size: 0.8rem;
}

@media (max-width: 992px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .latest-articles-section {
        padding: 60px 0;
    }
    
    .latest-articles-section .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .latest-articles-section .section-title {
        font-size: 1.4rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .article-card {
        padding: 20px;
    }
}

/* Footer Styles */
.footer {
    background: var(--background-card);
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-section h4 i {
    color: var(--primary-color);
    margin-right: 8px;
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-bottom .icp {
    margin-top: 10px;
}

.footer-bottom .icp a {
    color: var(--text-light);
    font-size: 0.85rem;
    transition: var(--transition);
}

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

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive Styles */
@media (max-width: 1024px) {
    .translator-container {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .swap-btn {
        transform: rotate(90deg);
        align-self: center;
    }

    .swap-btn:hover {
        transform: rotate(270deg);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .search-bar {
        display: none;
    }

    .hamburger {
        display: block;
    }

    body {
        padding-top: 60px;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero-content p {
        font-size: 0.95rem;
    }

    .translator-card {
        padding: 15px;
    }

    .translator-container {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .swap-btn {
        transform: rotate(90deg);
        align-self: center;
        margin: 5px 0;
    }

    .swap-btn:hover {
        transform: rotate(270deg);
    }

    .translator-content textarea {
        height: 100px;
        font-size: 1rem;
    }

    .translator-header {
        padding: 10px 15px;
    }

    .translator-content {
        padding: 15px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .history-content {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
        padding: 15px;
    }

    .history-lang {
        min-width: auto;
        gap: 10px;
    }

    .history-time {
        text-align: left;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .languages-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }

    .language-card {
        padding: 12px;
    }

    .language-card i {
        font-size: 1.3rem;
        margin-bottom: 8px;
    }

    .language-card h4 {
        font-size: 0.85rem;
    }

    .language-card span {
        font-size: 0.7rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

    .hero-content p {
        font-size: 0.85rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.85rem;
    }

    .translator-card {
        padding: 10px;
    }

    .translator-actions button.action-btn {
        padding: 5px 8px;
        font-size: 10px;
    }

    .translator-actions button.action-btn i {
        font-size: 12px;
    }

    .translator-actions button.action-btn span {
        display: inline;
    }

    .translator-actions button.action-btn {
        min-width: auto;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 20px;
    }

    .feature-icon {
        width: 50px;
        height: 50px;
    }

    .feature-icon i {
        font-size: 1.3rem;
    }

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

/* Minimalist Article Page */
.article-page {
    max-width: 720px;
    margin: 0 auto;
    padding: 60px 40px 80px;
}

.article-header {
    margin-bottom: 50px;
}

.article-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: #111;
    line-height: 1.4;
    margin-bottom: 25px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 25px;
    color: #999;
    font-size: 0.9rem;
}

.article-image {
    margin: 0 0 45px;
}

.article-image img {
    width: 100%;
    border-radius: 8px;
    display: block;
}

.article-intro {
    color: #666;
    font-size: 1.05rem;
    line-height: 1.8;
    margin-bottom: 40px;
    padding-left: 20px;
    border-left: 2px solid #ddd;
}

.article-body {
    color: #333;
    font-size: 1.05rem;
    line-height: 2;
}

.article-body p {
    margin-bottom: 1.8em;
}

.article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    margin: 1.5em 0;
}

.article-tags {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid #eee;
}

.article-tags span {
    color: #999;
    margin-right: 10px;
}

.article-tags a {
    color: #666;
    text-decoration: none;
    margin-right: 10px;
    padding: 4px 10px;
    border: 1px solid #ddd;
    border-radius: 3px;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.article-tags a:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.article-nav {
    margin-top: 50px;
    padding: 25px 0;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
}

.article-nav .next {
    text-align: right;
}

.article-nav span {
    color: #999;
    font-size: 0.85rem;
}

.article-nav a {
    display: block;
    color: #333;
    text-decoration: none;
    margin-top: 8px;
    font-size: 1rem;
    transition: color 0.2s;
}

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

@media (max-width: 768px) {
    .article-page {
        padding: 30px 20px !important;
    }

    .article-title {
        font-size: 1.5rem !important;
    }

    .article-body {
        font-size: 1rem !important;
    }

    .article-meta {
        flex-wrap: wrap;
        gap: 15px !important;
    }

    .article-nav {
        flex-direction: column;
        gap: 20px;
    }

    .article-nav .next {
        text-align: left !important;
    }
}