/* Alibaba PuHuiTi Font Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* 阿里巴巴普惠体字体引用 */
@font-face {
    font-family: 'Alibaba PuHuiTi';
    src: url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-35-Thin.woff2') format('woff2'),
         url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-35-Thin.woff') format('woff');
    font-weight: 300;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Alibaba PuHuiTi';
    src: url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-45-Light.woff2') format('woff2'),
         url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-45-Light.woff') format('woff');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Alibaba PuHuiTi';
    src: url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-55-Regular.woff2') format('woff2'),
         url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-55-Regular.woff') format('woff');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Alibaba PuHuiTi';
    src: url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-65-Medium.woff2') format('woff2'),
         url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-65-Medium.woff') format('woff');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Alibaba PuHuiTi';
    src: url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-85-Bold.woff2') format('woff2'),
         url('https://puhuiti.oss-cn-hangzhou.aliyuncs.com/AlibabaPuHuiTi-3-85-Bold.woff') format('woff');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

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

:root {
    /* Apple-inspired Color Palette */
    --color-primary: #007AFF;
    --color-primary-dark: #0051D5;
    --color-secondary: #5856D6;
    --color-success: #30D158;
    --color-warning: #FF9500;
    --color-error: #FF3B30;

    /* Neutral Colors */
    --color-background: #FFFFFF;
    --color-surface: #F9F9F9;
    --color-card: #FFFFFF;
    --color-border: #E5E5E7;
    --color-divider: #F2F2F7;

    /* Text Colors */
    --color-text-primary: #1D1D1F;
    --color-text-secondary: #6E6E73;
    --color-text-tertiary: #86868B;
    --color-text-inverse: #FFFFFF;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Typography */
    --font-family: "Alibaba PuHuiTi", "阿里巴巴普惠体", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-background: #000000;
        --color-surface: #1C1C1E;
        --color-card: #2C2C2E;
        --color-border: #38383A;
        --color-divider: #3A3A3C;

        --color-text-primary: #FFFFFF;
        --color-text-secondary: #AEAEB2;
        --color-text-tertiary: #8E8E93;
    }
}

/* Base Typography */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Offset for fixed header */
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

p {
    margin-bottom: var(--space-4);
    color: var(--color-text-secondary);
}

/* Layout Components */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* Header */
.header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all var(--transition-base);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) 0;
}

.logo h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
    margin: 0;
}

.logo-link {
    color: inherit;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.logo-link:hover {
    opacity: 0.8;
    transform: scale(1.02);
}

.tagline {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.nav-links {
    display: flex;
    gap: var(--space-6);
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--color-primary);
    transition: width var(--transition-base);
}

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

@media (max-width: 768px) {
    .nav {
        flex-direction: column;
        text-align: center;
    }

    .nav-links {
        margin-top: var(--space-3);
    }
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #007AFF 0%, #5856D6 100%);
    color: var(--color-text-inverse);
    padding: var(--space-24) 0;
    text-align: center;
}

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

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 700;
    margin-bottom: var(--space-6);
    line-height: 1.1;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    opacity: 1;
    margin-bottom: var(--space-12);
    line-height: 1.5;
    color: rgba(255, 255, 255, 0.95);
    font-weight: 400;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-12);
    margin-top: var(--space-12);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-lg);
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--space-6);
    }
}

/* Section Styles */
.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--space-8);
}

.section-header h2 {
    margin-bottom: var(--space-4);
}

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

/* Generator Section */
.generator-section {
    padding: var(--space-10) 0;
    background-color: var(--color-surface);
}

.generator-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-12);
    max-width: 1000px;
    margin: 0 auto;
}

.input-section {
    max-width: 500px;
    width: 100%;
}

@media (max-width: 768px) {
    .generator-container {
        gap: var(--space-8);
    }

    .input-section {
        max-width: 100%;
    }
}

.input-section {
    background: var(--color-card);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.name-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--space-3) var(--space-4);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: all var(--transition-base);
    background-color: var(--color-background);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.generate-btn {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-text-inverse);
    border: none;
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-md);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.generate-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.generate-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Results Section */
.results-section {
    background: var(--color-card);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-divider);
}

.results-header h3 {
    margin: 0;
    color: var(--color-text-primary);
}

.regenerate-btn {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
}

.regenerate-btn:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.name-results {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.name-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-6);
    transition: all var(--transition-base);
    cursor: pointer;
}

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

.name-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-4);
}

.name-chinese {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.name-pinyin {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    font-style: italic;
}

.copy-btn {
    background: var(--color-success);
    border: none;
    color: white;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.copy-btn:hover {
    transform: scale(1.05);
}

.copy-btn.copied {
    background: var(--color-primary);
}

.name-breakdown {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin: var(--space-4) 0;
    padding: var(--space-4);
    background: var(--color-background);
    border-radius: var(--radius-sm);
}

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

.name-part-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.name-part-chinese {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--space-1);
}

.name-part-pinyin {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-style: italic;
}

.name-meaning {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.name-meaning h4 {
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    font-size: var(--font-size-lg);
}

/* Features Section */
.features-section {
    padding: var(--space-20) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.feature-card {
    background: var(--color-card);
    padding: var(--space-8);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
}

.feature-card h3 {
    margin-bottom: var(--space-3);
    color: var(--color-text-primary);
}

.feature-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Blog Section */
.blog-section {
    padding: var(--space-20) 0;
    background-color: var(--color-surface);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.blog-card {
    background: var(--color-card);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

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

.blog-card h3 {
    margin-bottom: var(--space-3);
}

.blog-card h3 a {
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.blog-card p {
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.blog-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.tag {
    background: var(--color-primary);
    color: white;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-sm);
    font-weight: 500;
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    display: inline-block;
}

.tag:hover {
    background: var(--color-primary-dark);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* About Section */
.about-section {
    padding: var(--space-20) 0;
    background-color: var(--color-background);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    font-size: var(--font-size-lg);
    line-height: 1.7;
}

.about-content p {
    margin-bottom: var(--space-6);
    color: var(--color-text-secondary);
}

.about-content p:last-child {
    margin-bottom: 0;
    font-weight: 500;
    color: var(--color-text-primary);
}

/* Footer */
.footer {
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: var(--space-4);
    color: var(--color-text-inverse);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--space-2);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
}

/* Responsive Design */
@media (max-width: 640px) {
    .hero-stats {
        flex-direction: column;
        gap: var(--space-4);
    }

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

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

    .name-breakdown {
        grid-template-columns: 1fr;
    }

    .results-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
button:focus,
input:focus,
select:focus,
textarea:focus,
a:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}