/* ========================================
   上海田曲企业管理有限公司 - 官网样式
   www.tian-qu.com
   ======================================== */

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: #333; line-height: 1.6; background: #fff;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* --- Container --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* --- Color Variables --- */
:root {
    --primary: #1a5276;
    --primary-light: #2980b9;
    --accent: #e67e22;
    --accent-hover: #d35400;
    --dark: #1a1a2e;
    --light: #f8f9fa;
    --gray: #6c757d;
    --border: #e0e0e0;
    --shadow: 0 4px 20px rgba(0,0,0,.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,.12);
    --radius: 12px;
    --transition: .3s ease;
}

/* --- Header --- */
.header {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    background: rgba(255,255,255,.95); backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0,0,0,.06);
    transition: var(--transition);
}
.header.scrolled { background: rgba(255,255,255,.98); box-shadow: 0 2px 20px rgba(0,0,0,.1); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.25rem; color: var(--primary); }
.logo-icon { font-size: 1.5rem; }
.logo-img { width: 38px; height: 38px; border-radius: 4px; object-fit: contain; display: inline-block; vertical-align: middle; }
.nav { display: flex; gap: 32px; }
.nav-link {
    font-size: .95rem; font-weight: 500; color: var(--gray);
    position: relative; transition: var(--transition);
}
.nav-link::after {
    content: ''; position: absolute; bottom: -4px; left: 0; width: 0; height: 2px;
    background: var(--accent); transition: var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

/* Hamburger */
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 5px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--primary); transition: var(--transition); }

/* --- Hero --- */
.hero {
    position: relative; min-height: 100vh; display: flex; align-items: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    overflow: hidden;
}
.hero-bg {
    position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-content { position: relative; z-index: 1; text-align: center; padding: 120px 20px 60px; }
.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; color: #fff;
    margin-bottom: 20px; letter-spacing: 2px;
}
.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem); color: rgba(255,255,255,.85);
    margin-bottom: 40px; white-space: pre-line; line-height: 1.8;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 60px; flex-wrap: wrap; }
.hero-stats { display: flex; justify-content: center; gap: 60px; flex-wrap: wrap; }
.stat-item { text-align: center; }
.stat-num { display: block; font-size: 2.5rem; font-weight: 800; color: var(--accent); }
.stat-label { font-size: .9rem; color: rgba(255,255,255,.7); }

/* --- Buttons --- */
.btn {
    display: inline-block; padding: 14px 36px; border-radius: 50px; font-weight: 600;
    font-size: 1rem; transition: var(--transition); cursor: pointer; border: 2px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(230,126,34,.4); }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255,255,255,.6); }
.btn-outline:hover { background: #fff; color: var(--primary); transform: translateY(-2px); }
.btn-full { width: 100%; text-align: center; }

/* --- Sections --- */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag {
    display: inline-block; padding: 6px 20px; border-radius: 50px;
    background: rgba(26,82,118,.08); color: var(--primary-light);
    font-size: .85rem; font-weight: 600; letter-spacing: 1px; margin-bottom: 12px;
}
.section-title { font-size: 2.25rem; font-weight: 800; color: var(--dark); margin-bottom: 12px; }
.section-desc { font-size: 1.05rem; color: var(--gray); }

/* --- About --- */
.about { background: var(--light); }
.about-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: center; }
.about-img-placeholder {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius); padding: 80px 40px; text-align: center; color: #fff;
    box-shadow: var(--shadow-lg);
}
.about-img-icon { font-size: 4rem; display: block; margin-bottom: 16px; }
.about-content h3 { font-size: 1.5rem; color: var(--primary); margin-bottom: 16px; }
.about-content p { color: #555; margin-bottom: 16px; }
.about-list { margin-top: 20px; }
.about-list li { padding: 8px 0; color: #555; font-size: .95rem; }
.check { color: var(--accent); font-weight: 700; margin-right: 8px; }

/* --- Services --- */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.service-card {
    background: #fff; border-radius: var(--radius); padding: 40px 30px;
    box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--border);
    position: relative; overflow: hidden;
}
.service-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0); transform-origin: left; transition: var(--transition);
}
.service-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon { font-size: 2.5rem; margin-bottom: 16px; }
.service-card h3 { font-size: 1.25rem; color: var(--primary); margin-bottom: 12px; }
.service-card > p { color: #666; font-size: .9rem; margin-bottom: 16px; }
.service-features li {
    padding: 4px 0; font-size: .85rem; color: var(--gray);
    position: relative; padding-left: 16px;
}
.service-features li::before {
    content: ''; position: absolute; left: 0; top: 10px;
    width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}

/* --- Tools --- */
.tools { background: var(--light); }
.tools-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.tool-card {
    display: flex; align-items: center; gap: 24px;
    background: #fff; border-radius: var(--radius); padding: 36px 30px;
    box-shadow: var(--shadow); transition: var(--transition);
    border: 1px solid var(--border); position: relative; overflow: hidden;
    height: 100%;
}
.tool-card::before {
    content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--primary-light));
    transform: scaleX(0); transform-origin: left; transition: var(--transition);
}
.tool-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.tool-card:hover::before { transform: scaleX(1); }
.tool-icon {
    font-size: 3rem; flex-shrink: 0; width: 76px; height: 76px;
    display: flex; align-items: center; justify-content: center;
    background: rgba(41,128,185,.1); border-radius: 18px;
    transition: var(--transition);
}
.tool-card:hover .tool-icon { background: rgba(41,128,185,.16); transform: scale(1.05); }
.tool-info { flex: 1; }
.tool-info h3 { font-size: 1.3rem; color: var(--primary); margin-bottom: 8px; }
.tool-info p { font-size: .9rem; color: var(--gray); margin-bottom: 16px; line-height: 1.7; }
.tool-btn {
    display: inline-block; padding: 8px 22px; border-radius: 50px;
    background: var(--primary); color: #fff; font-size: .85rem; font-weight: 600;
    transition: var(--transition);
}
.tool-card:hover .tool-btn { background: var(--accent); }

/* --- Advantages --- */
.advantages { background: var(--light); }
.advantages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.advantage-item {
    text-align: center; padding: 40px 24px; background: #fff; border-radius: var(--radius);
    box-shadow: var(--shadow); transition: var(--transition);
}
.advantage-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.advantage-icon { font-size: 2.5rem; margin-bottom: 16px; }
.advantage-item h3 { font-size: 1.15rem; color: var(--primary); margin-bottom: 10px; }
.advantage-item p { color: var(--gray); font-size: .9rem; }

/* --- Process --- */
.process-timeline { display: flex; align-items: center; justify-content: center; gap: 10px; flex-wrap: wrap; }
.process-step {
    text-align: center; padding: 30px 24px; background: #fff; border-radius: var(--radius);
    box-shadow: var(--shadow); flex: 1; min-width: 200px; max-width: 240px;
    position: relative;
}
.step-number {
    display: inline-block; padding: 8px 20px; border-radius: 50px;
    background: var(--primary); color: #fff; font-weight: 700; font-size: 1rem;
    margin-bottom: 12px;
}
.process-step h3 { font-size: 1.05rem; color: var(--primary); margin-bottom: 8px; }
.process-step p { font-size: .85rem; color: var(--gray); }
.process-arrow { font-size: 1.5rem; color: var(--accent); font-weight: 700; }

/* --- Contact --- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-item { display: flex; align-items: flex-start; gap: 16px; padding: 20px 0; border-bottom: 1px solid var(--border); }
.ci-icon { font-size: 1.5rem; flex-shrink: 0; }
.contact-item h4 { font-size: 1rem; color: var(--primary); margin-bottom: 4px; }
.contact-item p { font-size: .9rem; color: var(--gray); }
.contact-form-wrapper {
    background: #fff; border-radius: var(--radius); padding: 40px; box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}
.contact-form h3 { font-size: 1.25rem; color: var(--primary); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.contact-form input,
.contact-form select,
.contact-form textarea {
    width: 100%; padding: 14px 16px; border: 1px solid var(--border); border-radius: 8px;
    font-size: .95rem; font-family: inherit; transition: var(--transition);
    background: var(--light);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
    outline: none; border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(41,128,185,.15);
    background: #fff;
}
.contact-form input, .contact-form select { margin-bottom: 16px; }
.contact-form textarea { margin-bottom: 20px; resize: vertical; }

/* --- Footer --- */
.footer { background: var(--dark); color: rgba(255,255,255,.7); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,.1); }
.footer-brand h4 { color: #fff; font-size: 1.15rem; margin-bottom: 12px; }
.footer-brand p { font-size: .9rem; line-height: 1.8; }
.footer-links h4, .footer-services h4, .footer-contact h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer-links a, .footer-services a {
    display: block; padding: 4px 0; font-size: .9rem; transition: var(--transition);
}
.footer-links a:hover, .footer-services a:hover { color: var(--accent); padding-left: 6px; }
.footer-contact p { font-size: .9rem; padding: 4px 0; }
.footer-bottom { padding: 20px 0; text-align: center; font-size: .85rem; }
.footer-bottom a { color: var(--accent); transition: var(--transition); }
.footer-bottom a:hover { color: #fff; }

/* --- Back to Top --- */
.back-to-top {
    position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px;
    border-radius: 50%; background: var(--primary); color: #fff; border: none;
    font-size: 1.25rem; cursor: pointer; opacity: 0; visibility: hidden;
    transition: var(--transition); box-shadow: var(--shadow); z-index: 999;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--accent); transform: translateY(-3px); }

/* --- Responsive --- */
@media (max-width: 992px) {
    .services-grid, .advantages-grid, .tools-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .nav { display: none; position: fixed; top: 70px; left: 0; width: 100%; background: #fff; flex-direction: column; padding: 20px; gap: 16px; box-shadow: var(--shadow); }
    .nav.open { display: flex; }
    .hamburger { display: flex; }
    .services-grid, .advantages-grid, .tools-grid { grid-template-columns: 1fr; }
    .hero-stats { gap: 30px; }
    .process-timeline { flex-direction: column; }
    .process-arrow { transform: rotate(90deg); }
    .form-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .section { padding: 60px 0; }
    .section-title { font-size: 1.75rem; }
}