/* ===========================
   武汉万德投资有限公司 - 主样式
   配色：深色 + 金色（高端商务风）
   =========================== */

:root {
    --primary: #c9a961;
    --primary-dark: #a88a45;
    --primary-light: #e4cd96;
    --dark: #0d0d0d;
    --dark-2: #1a1a1a;
    --dark-3: #242424;
    --dark-4: #2f2f2f;
    --text: #e8e8e8;
    --text-muted: #a0a0a0;
    --text-dim: #707070;
    --border: rgba(201, 169, 97, 0.15);
    --border-strong: rgba(201, 169, 97, 0.3);
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    --shadow-gold: 0 10px 40px rgba(201, 169, 97, 0.2);
    --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--dark);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
}

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

.container {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===========================
   导航栏
   =========================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(13, 13, 13, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    background: rgba(13, 13, 13, 0.95);
    border-bottom-color: var(--border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-mark {
    width: 46px;
    height: 46px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 26px;
    font-weight: bold;
    color: var(--dark);
    letter-spacing: -1px;
    box-shadow: 0 4px 12px rgba(201, 169, 97, 0.3);
}

.logo-text h1 {
    font-size: 18px;
    color: var(--text);
    margin: 0;
    letter-spacing: 1px;
    font-weight: 600;
}

.logo-text span {
    font-size: 10px;
    color: var(--primary);
    letter-spacing: 2px;
    font-weight: 300;
}

.nav-menu {
    display: flex;
    gap: 36px;
    align-items: center;
}

.nav-link {
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    position: relative;
    padding: 6px 0;
    transition: var(--transition);
    letter-spacing: 0.5px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-link.active::after,
.nav-link:hover::after {
    width: 24px;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 6px;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===========================
   首屏 Hero
   =========================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 120px 0 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, #1a1a1a 0%, #0d0d0d 50%, #1f1810 100%),
        url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M0 0L100 100" stroke="%23c9a961" stroke-width="0.5"/></svg>');
    background-size: cover, 40px 40px;
    opacity: 1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(201, 169, 97, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(201, 169, 97, 0.08) 0%, transparent 50%);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(13, 13, 13, 0.3) 0%, rgba(13, 13, 13, 0.8) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 24px;
}

.hero-tagline {
    display: inline-block;
    color: var(--primary);
    font-size: 13px;
    letter-spacing: 4px;
    margin-bottom: 28px;
    padding: 8px 20px;
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    background: rgba(201, 169, 97, 0.05);
    animation: fadeUp 0.8s ease forwards;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(48px, 8vw, 88px);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #ffffff 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeUp 1s ease forwards;
    letter-spacing: 4px;
}

.hero-subtitle {
    font-size: clamp(15px, 1.5vw, 18px);
    color: var(--text-muted);
    margin-bottom: 48px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
    animation: fadeUp 1.2s ease forwards;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 80px;
    animation: fadeUp 1.4s ease forwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 36px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
    text-transform: uppercase;
}

.btn-primary {
    background: var(--primary);
    color: var(--dark);
    box-shadow: 0 6px 20px rgba(201, 169, 97, 0.3);
}

.btn-primary:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(201, 169, 97, 0.5);
}

.btn-outline {
    border-color: var(--primary);
    color: var(--primary);
    background: transparent;
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--dark);
    transform: translateY(-2px);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
    animation: fadeUp 1.6s ease forwards;
}

.stat {
    text-align: center;
    padding: 24px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.stat:hover {
    border-color: var(--border-strong);
    background: rgba(201, 169, 97, 0.05);
    transform: translateY(-4px);
}

.stat-num {
    font-family: var(--font-serif);
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-num span {
    font-size: 0.5em;
    margin-left: 4px;
    color: var(--text-muted);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    letter-spacing: 2px;
}

.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--text-muted);
    font-size: 11px;
    letter-spacing: 4px;
    z-index: 2;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--primary), transparent);
    position: relative;
    overflow: hidden;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: -40px;
    width: 100%;
    height: 40px;
    background: linear-gradient(to bottom, transparent, var(--primary));
    animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
    0% { top: -40px; }
    100% { top: 40px; }
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===========================
   通用 Section
   =========================== */
.section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-tag {
    display: inline-block;
    color: var(--primary);
    font-size: 12px;
    letter-spacing: 5px;
    margin-bottom: 16px;
    font-weight: 500;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 600;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

.title-line {
    width: 60px;
    height: 2px;
    background: var(--primary);
    margin: 0 auto;
    position: relative;
}

.title-line::before {
    content: '';
    position: absolute;
    left: -8px;
    top: -3px;
    width: 8px;
    height: 8px;
    background: var(--primary);
    transform: rotate(45deg);
}

.section-subtitle {
    margin-top: 24px;
    color: var(--text-muted);
    font-size: 16px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ===========================
   关于我们
   =========================== */
.about {
    background: var(--dark);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text .lead-text {
    font-size: 18px;
    line-height: 1.9;
    color: var(--text);
    margin-bottom: 24px;
}

.about-text strong {
    color: var(--primary);
    font-weight: 600;
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 20px;
    font-size: 15px;
}

.about-features {
    margin-top: 40px;
    display: grid;
    gap: 20px;
}

.feature-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature-icon {
    width: 32px;
    height: 32px;
    background: rgba(201, 169, 97, 0.1);
    border: 1px solid var(--border-strong);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-weight: bold;
    flex-shrink: 0;
}

.feature-text h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 6px;
}

.feature-text p {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0 !important;
}

.about-visual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.visual-card {
    padding: 40px 24px;
    background: var(--dark-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.visual-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    transform: translateX(-100%);
    transition: var(--transition);
}

.visual-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    background: var(--dark-3);
}

.visual-card:hover::before {
    transform: translateX(0);
}

.card-year {
    font-family: var(--font-serif);
    font-size: 36px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.card-label {
    color: var(--text-muted);
    font-size: 13px;
    letter-spacing: 2px;
}

/* ===========================
   业务领域
   =========================== */
.services {
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark-2) 100%);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--dark-2);
    border: 1px solid var(--border);
    padding: 40px 32px;
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(201, 169, 97, 0.08), transparent 60%);
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: var(--shadow-gold);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 56px;
    height: 56px;
    color: var(--primary);
    margin-bottom: 24px;
    position: relative;
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-card h3 {
    font-family: var(--font-serif);
    font-size: 22px;
    color: #fff;
    margin-bottom: 16px;
    position: relative;
}

.service-card p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
    position: relative;
}

.service-list {
    border-top: 1px solid var(--border);
    padding-top: 16px;
    position: relative;
}

.service-list li {
    color: var(--text);
    font-size: 13px;
    padding: 4px 0;
    padding-left: 18px;
    position: relative;
}

.service-list li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* ===========================
   企业优势
   =========================== */
.strength {
    background: var(--dark-2);
    position: relative;
}

.strength::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(201, 169, 97, 0.05), transparent 70%);
}

.strength-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--border);
    border: 1px solid var(--border);
}

.strength-card {
    background: var(--dark-2);
    padding: 48px 36px;
    transition: var(--transition);
    position: relative;
}

.strength-card:hover {
    background: var(--dark-3);
}

.strength-card:hover .strength-num {
    color: var(--primary-light);
    transform: scale(1.05);
}

.strength-num {
    font-family: var(--font-serif);
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
    opacity: 0.6;
    margin-bottom: 16px;
    transition: var(--transition);
    line-height: 1;
}

.strength-card h4 {
    font-family: var(--font-serif);
    font-size: 20px;
    color: #fff;
    margin-bottom: 12px;
}

.strength-card p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.7;
}

/* ===========================
   联系我们
   =========================== */
.contact {
    background: linear-gradient(180deg, var(--dark) 0%, var(--dark-2) 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.contact-card {
    background: var(--dark-2);
    border: 1px solid var(--border);
    padding: 40px 28px;
    text-align: center;
    border-radius: 8px;
    transition: var(--transition);
}

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

.contact-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    color: var(--primary);
    background: rgba(201, 169, 97, 0.08);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 12px;
}

.contact-icon svg { width: 100%; height: 100%; }

.contact-card h4 {
    font-family: var(--font-serif);
    color: #fff;
    font-size: 18px;
    margin-bottom: 12px;
}

.contact-card p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.7;
}

.map-wrap {
    margin-top: 48px;
}

.map-placeholder {
    background: var(--dark-2);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 80px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.map-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(45deg, transparent 48%, var(--border) 49%, var(--border) 51%, transparent 52%) 0 0/40px 40px,
        linear-gradient(-45deg, transparent 48%, var(--border) 49%, var(--border) 51%, transparent 52%) 0 0/40px 40px;
    opacity: 0.3;
}

.map-placeholder > svg {
    width: 48px;
    height: 48px;
    color: var(--primary);
    margin-bottom: 16px;
    position: relative;
}

.map-info {
    position: relative;
}

.map-info h4 {
    font-family: var(--font-serif);
    font-size: 22px;
    color: #fff;
    margin-bottom: 12px;
}

.map-info p {
    color: var(--text-muted);
    font-size: 14px;
    margin-bottom: 6px;
}

/* ===========================
   页脚
   =========================== */
.footer {
    background: #050505;
    padding: 80px 0 0;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: 48px;
    padding-bottom: 60px;
    border-bottom: 1px solid var(--border);
}

.footer-col p {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.8;
    margin-top: 16px;
}

.footer-col h4 {
    font-family: var(--font-serif);
    color: #fff;
    font-size: 16px;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: var(--text-muted);
    font-size: 14px;
    transition: var(--transition);
}

.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }

.footer-contact li {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 14px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.footer-logo .logo-mark {
    width: 40px;
    height: 40px;
    font-size: 22px;
}

.footer-logo h3 {
    font-size: 16px;
    color: #fff;
    margin: 0;
}

.footer-logo span {
    font-size: 9px;
    color: var(--primary);
    letter-spacing: 2px;
}

.footer-bottom {
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    color: var(--text-dim);
    font-size: 13px;
    margin-bottom: 8px;
}

.footer-note {
    color: var(--text-dim);
    font-size: 12px;
    opacity: 0.7;
}

/* ===========================
   返回顶部
   =========================== */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: var(--dark);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 6px 20px rgba(201, 169, 97, 0.4);
}

.back-top.show {
    opacity: 1;
    visibility: visible;
}

.back-top:hover {
    background: var(--primary-light);
    transform: translateY(-4px);
}

.back-top svg {
    width: 20px;
    height: 20px;
}

/* ===========================
   滚动动画
   =========================== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===========================
   响应式
   =========================== */
@media (max-width: 1024px) {
    .hero-stats { grid-template-columns: repeat(2, 1fr); }
    .services-grid,
    .strength-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; gap: 60px; }
}

@media (max-width: 768px) {
    .section { padding: 80px 0; }

    .hamburger { display: flex; }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--dark-2);
        flex-direction: column;
        padding: 100px 40px 40px;
        gap: 24px;
        transition: var(--transition);
        border-left: 1px solid var(--border);
    }

    .nav-menu.active { right: 0; }

    .hero-title { letter-spacing: 2px; }
    .hero-buttons { flex-direction: column; align-items: center; }

    .services-grid,
    .strength-grid,
    .contact-grid { grid-template-columns: 1fr; }

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

    .footer-grid { grid-template-columns: 1fr; gap: 32px; }

    .logo-text h1 { font-size: 15px; }
    .logo-text span { font-size: 9px; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .stat { padding: 16px 8px; }
    .stat-num { font-size: 24px; }
    .about-visual { grid-template-columns: 1fr 1fr; gap: 12px; }
    .visual-card { padding: 24px 16px; }
    .card-year { font-size: 28px; }
}