/* ===== Pro Tiles 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --white: #ffffff;
    --offwhite: #fafaf8;
    --border: #e8e8e6;
    --text-dark: #2c2c2a;
    --text-soft: #5a5a58;
    --footer-bg: #1a1a18;
}

body {
    font-family: -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--white);
    color: var(--text-dark);
    line-height: 1.5;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.98);
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo-img {
    height: 52px;
    width: auto;
}

nav {
    display: flex;
    gap: 32px;
}

nav a {
    color: var(--text-dark);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
}

nav a:hover {
    opacity: 0.65;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
}

/* Hero / Banner */
.hero {
    min-height: 450px;
    background: linear-gradient(135deg, #f5f5f2 0%, #fefefc 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 20px;
}

.hero-content h1 {
    font-size: 48px;
    margin-bottom: 16px;
}

.hero-content p {
    font-size: 18px;
    color: var(--text-soft);
    max-width: 700px;
    margin: 0 auto;
}

.hero-cta {
    display: inline-block;
    margin-top: 28px;
    padding: 12px 36px;
    background: #2c2c2a;
    color: white;
    text-decoration: none;
    border-radius: 40px;
    font-weight: 500;
}

/* Sections */
.section {
    padding: 70px 0;
    border-bottom: 1px solid var(--border);
}

.section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 48px;
}

.about-content {
    max-width: 880px;
    margin: 0 auto;
    text-align: center;
    font-size: 17px;
    line-height: 1.7;
    color: var(--text-soft);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 28px;
}

.feature-card {
    background: var(--offwhite);
    padding: 32px 20px;
    text-align: center;
    border-radius: 24px;
    border: 1px solid var(--border);
}

.feature-icon {
    font-size: 42px;
    margin-bottom: 16px;
    display: inline-block;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: #8a8a88;
}

/* CTA */
.cta-section {
    background: var(--offwhite);
    text-align: center;
    padding: 60px 24px;
    border-radius: 32px;
    margin: 40px 0 60px;
}

.cta-section h3 {
    font-size: 28px;
    margin-bottom: 12px;
}

.cta-btn {
    display: inline-block;
    margin-top: 24px;
    background: var(--text-dark);
    color: white;
    padding: 14px 40px;
    border-radius: 40px;
    text-decoration: none;
    font-weight: 500;
}

.cta-btn:hover {
    background: #4a4a48;
}

.btn-secondary {
    display: inline-block;
    padding: 12px 28px;
    background: transparent;
    border: 1.5px solid var(--text-dark);
    border-radius: 40px;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
}

.btn-secondary:hover {
    background: var(--text-dark);
    color: white;
}

/* Footer */
footer {
    background: var(--footer-bg);
    color: #d1d1ce;
    padding: 56px 0 32px;
    margin-top: 48px;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 48px;
}

.footer-col h4 {
    color: white;
    font-size: 17px;
    margin-bottom: 20px;
}

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

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col a {
    color: #bcbcb8;
    text-decoration: none;
    font-size: 14px;
}

.footer-col a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 14px;
    margin-top: 16px;
}

.social-icon {
    display: inline-flex;
    width: 38px;
    height: 38px;
    background: #2e2e2c;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    color: #eaeae6;
    font-weight: 500;
}

.social-icon:hover {
    background: #4a4a48;
}

.footer-bottom {
    text-align: center;
    padding-top: 48px;
    margin-top: 32px;
    border-top: 1px solid #33332e;
    font-size: 13px;
    color: #8a8a86;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
}

/* 响应式 */
@media (max-width: 768px) {
    .header-container {
        height: auto;
        padding: 16px 24px;
        flex-wrap: wrap;
    }
    .mobile-menu-btn {
        display: block;
    }
    nav {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 16px;
        padding: 20px 0 10px;
    }
    nav.active {
        display: flex;
    }
    .section {
        padding: 50px 0;
    }
    .footer-container {
        gap: 32px;
    }
}