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

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    height: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
}

a {
    color: var(--accent-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

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

input:focus, select:focus, button:focus, textarea:focus {
    outline: none;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

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

.container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-active);
    box-shadow: var(--shadow-lg);
}

.text-mono {
    font-family: var(--font-mono);
}

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

.text-secondary {
    color: var(--text-secondary);
}

.text-accent {
    color: var(--accent-primary);
}

.text-success {
    color: var(--accent-success);
}

.text-warning {
    color: var(--accent-warning);
}

.text-danger {
    color: var(--accent-danger);
}

.page {
    display: none;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.page.active {
    display: block;
    opacity: 1;
}

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 640px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--accent-glow);
}

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

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

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-input:hover {
    border-color: var(--accent-primary);
}

.form-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-select {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-input);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-select:hover {
    border-color: var(--accent-primary);
}

.form-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-unit {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: var(--spacing-xs);
}

.input-with-unit {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.input-with-unit .form-input {
    flex: 1;
}

.result-card {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(96, 165, 250, 0.05));
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-default);
}

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

.result-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.result-value {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--accent-secondary);
    font-size: 1rem;
}

.result-unit {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-left: var(--spacing-xs);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    background: rgba(59, 130, 246, 0.2);
    color: var(--accent-secondary);
}

.schematic-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    text-align: center;
    margin: var(--spacing-lg) 0;
}

.schematic-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

/* Footer Styles */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-default);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid var(--border-default);
}

.footer-brand {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.footer-logo {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.footer-logo svg {
    width: 32px;
    height: 32px;
    fill: white;
}

.footer-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.footer-info p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-nav {
    display: grid;
    grid-template-columns: 1fr 1fr 1.5fr;
    gap: var(--spacing-xl);
}

.footer-col h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    transition: color var(--transition-fast);
}

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

.footer-qrcodes {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: nowrap;
    justify-content: flex-start;
}

.qrcode-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.qrcode-container {
    width: 100px;
    height: 100px;
    background: var(--bg-card);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.qrcode-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 当图片加载失败时显示占位符 */
.qrcode-container:has(.qrcode-img[alt]) {
    color: var(--text-muted);
}

.qrcode-item span {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-align: center;
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
    text-align: center;
}

.footer-contact {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    justify-content: center;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.contact-item svg {
    color: var(--accent-primary);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    justify-content: center;
}

.legal-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.legal-item svg {
    color: var(--accent-success);
}

.footer-copyright {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-copyright p {
    color: var(--text-muted);
    font-size: 0.8125rem;
}

@media (max-width: 1024px) {
    .footer-top {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .footer-nav {
        grid-template-columns: 1fr;
    }
    
    .footer-qrcodes {
        justify-content: flex-start;
    }
    
    .footer-contact,
    .footer-legal {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}