/* EZI Sourcing 公共样式文件 */

/* --- CSS 变量与重置 --- */
:root {
    --primary-color: #003366; /* 深蓝：代表专业与信任 */
    --accent-color: #D9534F;  /* 强调色：用于按钮 */
    --text-dark: #333333;
    --text-light: #666666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --border-color: #e0e0e0;
    --spacing-unit: 1rem;
}

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

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

/* --- 通用布局类 --- */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

.section-padding {
    padding: 4rem 0;
}

.section-title {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
}

.section-subtitle {
    text-align: center;
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* --- 按钮样式 --- */
.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 4px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.btn:hover {
    background-color: #002244;
}

.btn-accent {
    background-color: var(--accent-color);
}
.btn-accent:hover {
    background-color: #c9302c;
}

/* --- Header / 导航 --- */
header {
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-dark);
}

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

.hamburger {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* --- Footer --- */
footer {
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #ccc;
    padding: 4rem 0 2rem;
    font-size: 0.95rem;
    line-height: 1.8;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand h3 {
    color: var(--white);
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.footer-tagline {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.footer-desc {
    color: #999;
    font-size: 0.9rem;
    max-width: 300px;
}

.footer-links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-links-col h4,
.footer-contact-col h4 {
    color: var(--white);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-links-col h4::after,
.footer-contact-col h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent-color);
}

.footer-links-col ul li {
    margin-bottom: 0.9rem;
    transition: transform 0.2s ease;
}

.footer-links-col ul li:hover {
    transform: translateX(5px);
}

.footer-links-col a {
    color: #ccc;
    transition: color 0.3s ease;
    display: inline-block;
}

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

.footer-contact-col ul li {
    margin-bottom: 1rem;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.contact-icon {
    color: var(--primary-color);
    font-size: 1rem;
    margin-top: 2px;
    min-width: 20px;
    text-align: center;
}

.contact-text {
    color: #ccc;
    font-size: 0.9rem;
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 2rem;
}

.copyright {
    text-align: center;
}

.copyright p {
    color: #999;
    font-size: 0.85rem;
    margin-bottom: 0.3rem;
}

.footer-legal {
    color: #777;
    font-size: 0.8rem;
}

/* Footer Hover Effects */
.footer-links-col a {
    position: relative;
}

.footer-links-col a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: -2px;
    left: 0;
    background-color: var(--accent-color);
    transition: width 0.3s ease;
}

.footer-links-col a:hover::after {
    width: 100%;
}

/* --- 表单样式 --- */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    height: 150px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

/* --- 响应式设计 --- */
@media (max-width: 992px) {
    .footer-top {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

@media (max-width: 768px) {
    footer {
        padding: 3rem 0 1.5rem;
    }

    .footer-brand h3 {
        font-size: 1.5rem;
    }

    .footer-links-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-contact-col {
        order: -1;
    }

    .footer-links-col h4,
    .footer-contact-col h4 {
        font-size: 1rem;
        margin-bottom: 1rem;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: block;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}