/* ===================================
   知己文化传媒 - 主样式表
   =================================== */

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --color-primary: #8B1A1A;
    --color-primary-dark: #6B1010;
    --color-accent: #C4922E;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-bg: #FFFFFF;
    --color-bg-light: #F9F7F4;
    --color-bg-dark: #1A1A1A;
    --color-border: #E8E4DD;
    --font-cn: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    --font-en: Georgia, "Times New Roman", serif;
    --max-width: 1200px;
    --header-height: 72px;
}

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-cn);
    color: var(--color-text);
    line-height: 1.8;
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section { padding: 80px 0; }
.bg-light { background: var(--color-bg-light); }

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 4px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    text-align: center;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255,255,255,0.6);
}
.btn-outline:hover {
    background: #fff;
    color: var(--color-text);
    border-color: #fff;
}

.btn-block { width: 100%; }

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.header.scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: 0 1px 20px rgba(0,0,0,0.05);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
    color: var(--color-text);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-primary);
    color: #fff;
    border-radius: 6px;
    font-size: 22px;
    font-family: var(--font-en);
}

.nav { display: flex; gap: 8px; }

.nav-link {
    padding: 8px 20px;
    border-radius: 4px;
    font-size: 15px;
    color: var(--color-text-light);
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(139,26,26,0.06);
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all 0.3s ease;
}

/* --- Hero --- */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d1b1b 40%, #4a1a1a 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(196,146,46,0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 50%, rgba(139,26,26,0.2) 0%, transparent 50%);
    animation: heroFloat 20s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.35);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    padding: 0 20px;
}

.hero-subtitle {
    font-size: 18px;
    letter-spacing: 6px;
    margin-bottom: 20px;
    opacity: 0.85;
}

.hero-title {
    font-size: 52px;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.hero-desc {
    font-size: 17px;
    opacity: 0.8;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* --- Section Header --- */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 12px;
}

.section-header p {
    font-size: 16px;
    color: var(--color-text-light);
}

/* --- Features --- */
.features {
    padding: 80px 0;
    background: var(--color-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 40px 24px;
    border-radius: 8px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    border-color: transparent;
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
    color: var(--color-primary);
}

.feature-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--color-text);
}

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

/* --- Services Overview --- */
.services-overview {
    padding: 80px 0;
    background: var(--color-bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.service-item {
    display: block;
    padding: 40px 28px;
    background: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.service-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--color-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.service-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    border-color: transparent;
}

.service-item:hover::before {
    transform: scaleX(1);
}

.service-num {
    font-family: var(--font-en);
    font-size: 36px;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.3;
    display: block;
    margin-bottom: 8px;
}

.service-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--color-text);
}

.service-item p {
    font-size: 14px;
    color: var(--color-text-light);
}

/* --- CTA --- */
.cta {
    padding: 80px 0;
    text-align: center;
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    color: #fff;
}

.cta h2 {
    font-size: 32px;
    margin-bottom: 16px;
}

.cta p {
    font-size: 16px;
    opacity: 0.85;
    margin-bottom: 32px;
}

.cta .btn-primary {
    background: #fff;
    color: var(--color-primary);
    border-color: #fff;
}

.cta .btn-primary:hover {
    background: transparent;
    color: #fff;
}

/* --- Page Banner --- */
.page-banner {
    padding: 140px 0 60px;
    text-align: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #2d1b1b 100%);
    color: #fff;
}

.page-banner h1 {
    font-size: 38px;
    font-weight: 700;
    margin-bottom: 12px;
}

.page-banner p {
    font-size: 17px;
    opacity: 0.75;
}

/* --- About Page --- */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 30px;
    margin-bottom: 24px;
}

.about-text p {
    font-size: 15px;
    color: var(--color-text-light);
    margin-bottom: 16px;
    line-height: 1.9;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #2d1b1b 0%, #4a1a1a 50%, #1a1a2e 100%);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.7);
    font-size: 15px;
    gap: 12px;
    position: relative;
    overflow: hidden;
}
.image-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 40%, rgba(196,146,46,0.15) 0%, transparent 60%);
}
.image-placeholder .ph-icon {
    font-size: 48px;
    position: relative;
    z-index: 1;
}
.image-placeholder .ph-text {
    position: relative;
    z-index: 1;
    letter-spacing: 2px;
}

/* Culture */
.culture-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.culture-item {
    padding: 40px 30px;
    background: var(--color-bg);
    border-radius: 8px;
    border: 1px solid var(--color-border);
    text-align: center;
}

.culture-item h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--color-primary);
}

.culture-item p {
    font-size: 15px;
    color: var(--color-text-light);
}

/* Team */
.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.team-card {
    text-align: center;
    padding: 30px 20px;
}

.team-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: var(--color-bg-light);
    border: 2px dashed var(--color-border);
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--color-text-light);
}

.team-card h3 {
    font-size: 17px;
    margin-bottom: 6px;
}

.team-card p {
    font-size: 14px;
    color: var(--color-text-light);
}

/* --- Services Detail --- */
.service-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.service-detail-grid.reverse {
    direction: ltr;
}
.service-detail-grid.reverse > * {
    direction: ltr;
}

.service-label {
    font-family: var(--font-en);
    font-size: 48px;
    font-weight: 700;
    color: var(--color-accent);
    opacity: 0.25;
    display: block;
    margin-bottom: 4px;
    line-height: 1;
}

.service-detail-text h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

.service-detail-text > p {
    font-size: 15px;
    color: var(--color-text-light);
    margin-bottom: 20px;
    line-height: 1.9;
}

.service-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.service-list li {
    font-size: 14px;
    color: var(--color-text);
    padding: 8px 0;
    padding-left: 20px;
    position: relative;
}

.service-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 15px;
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 2px;
    transform: rotate(45deg);
}

/* --- Contact Page --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

.contact-info h2,
.contact-form-wrapper h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

.contact-info > p {
    font-size: 15px;
    color: var(--color-text-light);
    margin-bottom: 36px;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
    align-items: flex-start;
}

.contact-icon {
    font-size: 24px;
    flex-shrink: 0;
    margin-top: 2px;
}

.contact-item h4 {
    font-size: 16px;
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 15px;
    color: var(--color-text-light);
}

/* Form */
.contact-form-wrapper {
    background: var(--color-bg-light);
    padding: 40px;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--color-text);
}

.required { color: var(--color-primary); }

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 15px;
    font-family: var(--font-cn);
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color 0.3s ease;
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
}

.form-group textarea { resize: vertical; }

.form-success {
    margin-top: 20px;
    padding: 14px 20px;
    background: #e8f5e9;
    color: #2e7d32;
    border-radius: 4px;
    font-size: 15px;
    text-align: center;
}

/* --- Footer --- */
.footer {
    background: var(--color-bg-dark);
    color: #aaa;
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

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

.footer-col p {
    font-size: 14px;
    line-height: 1.8;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: #aaa;
    margin-bottom: 10px;
    transition: color 0.3s ease;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
    color: #666;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .features-grid,
    .services-grid,
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .culture-grid {
        grid-template-columns: 1fr;
    }

    .hero-title { font-size: 38px; }
}

@media (max-width: 768px) {
    .menu-toggle { display: flex; }

    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--color-border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.3s ease;
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-link {
        padding: 14px 0;
        border-bottom: 1px solid var(--color-border);
        border-radius: 0;
    }
    .nav-link:last-child { border-bottom: none; }

    .hero-title { font-size: 30px; }
    .hero-subtitle { font-size: 15px; letter-spacing: 3px; }
    .hero-desc { font-size: 15px; }

    .features-grid,
    .services-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }

    .about-grid,
    .service-detail-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .service-list {
        grid-template-columns: 1fr;
    }

    .section { padding: 50px 0; }
    .section-header { margin-bottom: 40px; }
    .section-header h2 { font-size: 26px; }

    .contact-form-wrapper { padding: 24px; }
}