/* ============================================
   润颂科技 Rainsong - 文艺温润风格网站
   ============================================ */

/* CSS 变量 */
:root {
    --rain-deep: #2c3e50;
    --rain-medium: #5d7b93;
    --rain-light: #8fa4b8;
    --rain-pale: #c9d6e3;
    --rain-white: #f0f4f8;
    --accent-warm: #d4a574;
    --accent-gold: #c9a959;
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --text-light: #8a9bae;
    --bg-cream: #fafbfc;
    --bg-white: #ffffff;
    --shadow-soft: 0 4px 20px rgba(44, 62, 80, 0.08);
    --shadow-hover: 0 8px 30px rgba(44, 62, 80, 0.12);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background: var(--bg-cream);
    line-height: 1.8;
    overflow-x: hidden;
}

/* 雨滴画布 */
#rainCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
    opacity: 0.4;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 20px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-soft);
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-img {
    width: 52px;
    height: 52px;
    transition: var(--transition);
}

.logo:hover .logo-img {
    transform: scale(1.08);
}

.logo-text {
    font-family: 'Noto Serif SC', serif;
    font-size: 18px;
    font-weight: 500;
    color: var(--rain-deep);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 400;
    position: relative;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--rain-medium);
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--rain-deep);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.mobile-menu {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu span {
    width: 24px;
    height: 2px;
    background: var(--rain-deep);
    transition: var(--transition);
}

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 120px 40px 80px;
    position: relative;
    background: linear-gradient(180deg, #e8eff6 0%, #f0f4f8 50%, var(--bg-cream) 100%);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 30% 20%, rgba(143, 164, 184, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, rgba(212, 165, 116, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.poem-quote {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.3s;
}

.poem-line {
    font-family: 'Noto Serif SC', serif;
    font-size: 18px;
    font-weight: 300;
    color: var(--rain-light);
    letter-spacing: 4px;
}

.poem-divider {
    color: var(--rain-pale);
    font-size: 24px;
}

.hero-title {
    margin-bottom: 30px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.5s;
}

.title-sub {
    display: block;
    font-family: 'Noto Serif SC', serif;
    font-size: 16px;
    font-weight: 400;
    color: var(--text-light);
    letter-spacing: 6px;
    margin-bottom: 20px;
}

.title-main {
    display: block;
    font-family: 'Noto Serif SC', serif;
    font-size: 56px;
    font-weight: 500;
    color: var(--rain-deep);
    line-height: 1.4;
    letter-spacing: 4px;
}

.hero-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 2;
    margin-bottom: 50px;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.7s;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 36px;
    background: linear-gradient(135deg, var(--rain-medium), var(--rain-deep));
    color: white;
    text-decoration: none;
    font-size: 15px;
    border-radius: 50px;
    transition: var(--transition);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.9s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(93, 123, 147, 0.3);
}

.cta-button svg {
    transition: var(--transition);
}

.cta-button:hover svg {
    transform: translateX(4px);
}

.scroll-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    animation-delay: 1.5s;
}

.scroll-hint span {
    font-size: 12px;
    color: var(--text-light);
    letter-spacing: 2px;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(180deg, var(--rain-light), transparent);
    animation: scrollPulse 2s ease infinite;
}

/* 通用区块样式 */
section {
    position: relative;
    z-index: 2;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--rain-medium);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 16px;
    padding: 8px 20px;
    background: rgba(143, 164, 184, 0.1);
    border-radius: 20px;
}

.section-title {
    font-family: 'Noto Serif SC', serif;
    font-size: 36px;
    font-weight: 500;
    color: var(--rain-deep);
    letter-spacing: 2px;
}

/* 关于我们 */
.about {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-white) 0%, #f5f8fb 100%);
}

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

.about-text {
    font-size: 16px;
    color: var(--text-secondary);
}

.lead-text {
    font-family: 'Noto Serif SC', serif;
    font-size: 22px;
    color: var(--rain-deep);
    margin-bottom: 24px;
    font-weight: 400;
}

.about-text p {
    margin-bottom: 20px;
    text-indent: 2em;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item {
    padding: 36px 24px;
    background: var(--bg-white);
    border-radius: 16px;
    transition: var(--transition);
    border: 1px solid var(--rain-pale);
    box-shadow: var(--shadow-soft);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--rain-light);
}

.stat-number {
    font-family: 'Noto Serif SC', serif;
    font-size: 42px;
    font-weight: 500;
    color: var(--rain-deep);
}

.stat-suffix {
    font-family: 'Noto Serif SC', serif;
    font-size: 24px;
    color: var(--rain-medium);
}

.stat-label {
    display: block;
    font-size: 14px;
    color: var(--text-light);
    margin-top: 8px;
    letter-spacing: 2px;
}

/* 服务区域 */
.services {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--bg-cream) 0%, var(--rain-white) 100%);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.service-card {
    padding: 40px;
    background: var(--bg-white);
    border-radius: 20px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: linear-gradient(180deg, var(--rain-medium), var(--rain-light));
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.service-card:hover::before {
    height: 100%;
}

.service-icon {
    width: 56px;
    height: 56px;
    margin-bottom: 24px;
    color: var(--rain-medium);
}

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

.service-card h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 22px;
    font-weight: 500;
    color: var(--rain-deep);
    margin-bottom: 16px;
}

.service-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.service-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--accent-warm);
    background: rgba(212, 165, 116, 0.1);
    padding: 6px 14px;
    border-radius: 15px;
    letter-spacing: 1px;
}

/* 案例展示 */
.cases {
    padding: 120px 0;
    background: var(--bg-cream);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.case-card {
    background: var(--bg-white);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--rain-pale);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.case-image {
    position: relative;
    height: 180px;
    background: linear-gradient(135deg, #e8eff6 0%, #d4dee8 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.case-icon {
    width: 72px;
    height: 72px;
    color: var(--rain-medium);
    transition: var(--transition);
}

.case-card:hover .case-icon {
    transform: scale(1.1);
    color: var(--rain-deep);
}

.case-overlay {
    position: absolute;
    top: 16px;
    right: 16px;
}

.case-tag {
    background: rgba(255, 255, 255, 0.9);
    color: var(--rain-deep);
    font-size: 12px;
    padding: 6px 14px;
    border-radius: 20px;
    font-weight: 500;
    letter-spacing: 1px;
}

.case-content {
    padding: 28px;
}

.case-content h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 20px;
    font-weight: 500;
    color: var(--rain-deep);
    margin-bottom: 14px;
}

.case-content p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 18px;
}

.case-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.case-tech span {
    font-size: 11px;
    color: var(--rain-medium);
    background: rgba(143, 164, 184, 0.1);
    padding: 5px 12px;
    border-radius: 15px;
    letter-spacing: 1px;
}

.case-result {
    display: flex;
    gap: 24px;
    padding-top: 18px;
    border-top: 1px solid var(--rain-pale);
}

.result-item {
    display: flex;
    flex-direction: column;
}

.result-number {
    font-family: 'Noto Serif SC', serif;
    font-size: 22px;
    font-weight: 500;
    color: var(--rain-deep);
}

.result-label {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 2px;
}

/* 理念区域 */
.philosophy {
    padding: 120px 0;
    background: linear-gradient(135deg, var(--rain-deep) 0%, #3d5468 100%);
    color: white;
}

.philosophy .section-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--rain-pale);
}

.philosophy .section-title {
    color: white;
}

.philosophy-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 80px;
}

.philosophy-item {
    text-align: center;
    padding: 40px 30px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    transition: var(--transition);
}

.philosophy-item:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
}

.philosophy-number {
    font-family: 'Noto Serif SC', serif;
    font-size: 48px;
    font-weight: 300;
    color: var(--accent-gold);
    margin-bottom: 20px;
}

.philosophy-item h3 {
    font-family: 'Noto Serif SC', serif;
    font-size: 20px;
    font-weight: 400;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.philosophy-item p {
    font-size: 14px;
    color: var(--rain-pale);
    line-height: 1.8;
}

.philosophy-quote {
    text-align: center;
    padding: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    max-width: 700px;
    margin: 0 auto;
}

.philosophy-quote blockquote {
    font-family: 'Noto Serif SC', serif;
    font-size: 18px;
    font-weight: 300;
    line-height: 2;
    color: var(--rain-pale);
    font-style: italic;
    margin-bottom: 20px;
}

.philosophy-quote cite {
    font-size: 14px;
    color: var(--text-light);
    font-style: normal;
}

/* 联系我们 */
.contact {
    padding: 120px 0;
    background: var(--bg-white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 80px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    min-width: 48px;
    background: var(--rain-white);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--rain-medium);
}

.contact-icon svg {
    width: 22px;
    height: 22px;
}

.contact-detail h4 {
    font-size: 16px;
    font-weight: 500;
    color: var(--rain-deep);
    margin-bottom: 8px;
}

.contact-detail p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 20px;
    border: 1px solid var(--rain-pale);
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-cream);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--rain-medium);
    background: white;
}

.form-group label {
    position: absolute;
    top: -10px;
    left: 16px;
    background: white;
    padding: 0 8px;
    font-size: 12px;
    color: var(--text-light);
    opacity: 0;
    transition: var(--transition);
}

.form-group input:focus + label,
.form-group textarea:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group textarea:not(:placeholder-shown) + label {
    opacity: 1;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.submit-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px 36px;
    background: linear-gradient(135deg, var(--rain-medium), var(--rain-deep));
    color: white;
    font-size: 15px;
    font-family: inherit;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    align-self: flex-start;
}

.submit-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(93, 123, 147, 0.3);
}

.submit-button svg {
    transition: var(--transition);
}

.submit-button:hover svg {
    transform: translate(4px, -4px);
}

/* 页脚 */
.footer {
    background: var(--rain-deep);
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo-img {
    filter: brightness(0) invert(1);
    opacity: 0.9;
}

.footer-brand .logo-text {
    color: white;
}

.footer-slogan {
    font-size: 14px;
    color: var(--rain-pale);
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
    letter-spacing: 2px;
}

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

.footer-column li {
    margin-bottom: 12px;
    font-size: 14px;
}

.footer-column a {
    color: var(--rain-pale);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--rain-light);
}

.footer-bottom .icp {
    margin-top: 8px;
    font-size: 12px;
    color: var(--rain-medium);
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scrollPulse {
    0%, 100% {
        opacity: 0.3;
        transform: scaleY(1);
    }
    50% {
        opacity: 1;
        transform: scaleY(1.2);
    }
}

/* 滚动动画 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .container {
        padding: 0 30px;
    }

    .title-main {
        font-size: 44px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }

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

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

    .philosophy-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu {
        display: flex;
    }

    .hero {
        padding: 100px 24px 60px;
    }

    .poem-quote {
        flex-direction: column;
        gap: 10px;
    }

    .poem-divider {
        display: none;
    }

    .poem-line {
        font-size: 16px;
    }

    .title-main {
        font-size: 36px;
    }

    .section-title {
        font-size: 28px;
    }

    .about, .services, .cases, .philosophy, .contact {
        padding: 80px 0;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .stat-item {
        padding: 24px;
    }

    .footer-links {
        flex-direction: column;
        gap: 30px;
    }
}

/* 移动端导航菜单 */
.nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    padding: 20px 40px;
    gap: 16px;
    box-shadow: var(--shadow-soft);
}

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