/* ==========================================
   回归音乐 - 中国水墨风格
   Return Music - Chinese Ink Style
   ========================================== */

:root {
    /* 九色配色体系 */
    --色一: #161311;
    --色二: #2B2421;
    --色三: #5B4C45;
    --色四: #8A776D;
    --色五: #F6F2EA;
    --色六: #E9E0D2;
    --色七: #B7442B;
    --色八: #C37A32;
    --色九: #3E5E5B;

    /* 语义映射 */
    --ink-black: var(--色一);
    --ink-dark: var(--色二);
    --ink-gray: var(--色三);
    --ink-light: var(--色四);
    --ink-lighter: var(--色四);

    --paper-white: var(--色五);
    --paper-gray: var(--色六);
    --paper-beige: var(--色六);

    --accent-red: var(--色七);
    --accent-gold: var(--色八);
    --accent-green: var(--色九);
    
    /* 中文字体 */
    --font-title: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
    --font-body: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 5rem;
    
    --transition: all 0.4s 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-body);
    color: var(--ink-black);
    background: var(--paper-white);
    line-height: 1.8;
    letter-spacing: 0.05em;
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.55s ease, transform 0.55s ease;
}

body.loaded {
    opacity: 1;
    transform: translateY(0);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================
   导航栏 - 水墨风格
   ========================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(246, 242, 234, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--paper-beige);
}

.nav.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.05);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.2rem var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-family: var(--font-title);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--ink-black);
    letter-spacing: 0.2em;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
}

.nav-link {
    color: var(--ink-gray);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
    letter-spacing: 0.1em;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-red);
    transition: var(--transition);
    transform: translateX(-50%);
}

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

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

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.3rem;
    cursor: pointer;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--ink-black);
    transition: var(--transition);
}

/* ==========================================
   首屏 - 水墨意境
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--spacing-xxl) + 60px) 0 var(--spacing-xxl);
    background: 
        linear-gradient(to bottom, rgba(250,248,245,0.95), rgba(250,248,245,0.7)),
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="4"/><feColorMatrix values="0 0 0 0 0, 0 0 0 0 0, 0 0 0 0 0, 0 0 0 0.02 0"/></filter></defs><rect width="1000" height="1000" filter="url(%23noise)" opacity="0.3"/></svg>');
    background-size: cover;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 10%;
    right: 5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(200,85,61,0.08) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 15%;
    left: 8%;
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(42,42,42,0.05) 0%, transparent 70%);
    border-radius: 50%;
    filter: blur(50px);
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-30px) translateX(20px); }
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-title);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    color: var(--ink-black);
    letter-spacing: 0.08em;
    line-height: 1.3;
    position: relative;
    text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.05);
}

.hero-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--accent-red);
    margin: var(--spacing-md) auto 0;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    margin-bottom: var(--spacing-xl);
    color: var(--ink-gray);
    letter-spacing: 0.15em;
    font-weight: 300;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

/* ==========================================
   按钮 - 水墨风格
   ========================================== */
.btn {
    display: inline-block;
    padding: 0.9rem 2rem;
    border-radius: 2px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    letter-spacing: 0.1em;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--ink-black);
    color: var(--paper-white);
    border: 1.5px solid var(--ink-black);
}

.btn-primary:hover {
    background: var(--ink-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(26,26,26,0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--ink-black);
    border: 1.5px solid var(--ink-black);
}

.btn-secondary:hover {
    background: var(--ink-black);
    color: var(--paper-white);
    transform: translateY(-2px);
}

/* ==========================================
   区块样式
   ========================================== */
.services,
.cases,
.about,
.contact {
    padding: var(--spacing-xxl) 0;
    position: relative;
}

.services {
    background: var(--paper-white);
}

.cases {
    background: var(--paper-gray);
}

.about {
    background: var(--paper-white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-title {
    font-family: var(--font-title);
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 600;
    color: var(--ink-black);
    letter-spacing: 0.15em;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--accent-red);
}

.services .section-title {
    font-family: var(--font-title);
    font-weight: 400;
    letter-spacing: 0.08em;
}

/* ==========================================
   服务卡片 - 水墨风格
   ========================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--spacing-xl);
}

.service-card {
    background: var(--paper-white);
    padding: var(--spacing-xl);
    border: 1px solid var(--paper-beige);
    transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1), box-shadow 0.5s ease, border-color 0.5s ease;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 0;
    background: var(--accent-red);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    border-color: var(--accent-red);
}

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

.service-card h3 {
    font-family: var(--font-title);
    font-size: 1.85rem;
    margin-bottom: var(--spacing-md);
    color: var(--ink-black);
    letter-spacing: 0.06em;
    font-weight: 400;
}

.service-list {
    list-style: none;
    display: grid;
    gap: 0.26rem;
}

.service-list li {
    padding: 0.3rem 0 0.3rem 1.55rem;
    position: relative;
    color: var(--ink-gray);
    font-size: 1.05rem;
    font-family: var(--font-body);
    letter-spacing: 0.03em;
    transition: var(--transition);
    line-height: 1.55;
}

.service-list li::before {
    content: "·";
    position: absolute;
    left: 0.42rem;
    top: 0.28rem;
    color: var(--accent-red);
    font-family: var(--font-title);
    font-size: 1.55rem;
    line-height: 1;
}

.service-list li:hover {
    color: var(--accent-green);
}

/* ==========================================
   案例卡片 - 水墨风格
   ========================================== */
.cases-note {
    margin-top: 1rem;
    color: var(--ink-light);
    letter-spacing: 0.06em;
}

.about-content {
    max-width: 860px;
    margin: 0 auto;
    padding: 1.25rem 1.4rem;
    border: 1px solid var(--paper-beige);
    background: rgba(255, 255, 255, 0.66);
    color: var(--ink-gray);
    line-height: 2;
    letter-spacing: 0.06em;
    text-align: center;
}

.cases-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.case-card {
    background: var(--paper-white);
    border: 1px solid var(--paper-beige);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
    display: grid;
    grid-template-columns: minmax(280px, 33%) 1fr;
    text-decoration: none;
    color: inherit;
}

.case-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(0,0,0,0.08);
}

.case-image {
    aspect-ratio: 16 / 9;
    height: auto;
    overflow: hidden;
    position: relative;
    border-right: 1px solid var(--paper-beige);
    background: var(--paper-gray);
}

.case-image::after {
    display: none;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.case-content {
    padding: 1rem 1.1rem;
}

.case-category {
    display: inline-block;
    padding: 0.3rem 1rem;
    background: var(--ink-black);
    color: var(--paper-white);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.1em;
}

.case-title {
    font-family: var(--font-title);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--ink-black);
    letter-spacing: 0.08em;
}

.case-client {
    font-size: 0.88rem;
    color: var(--ink-light);
    margin-bottom: 0.35rem;
    letter-spacing: 0.05em;
}

.case-desc {
    font-size: 0.9rem;
    color: var(--ink-gray);
    line-height: 1.7;
    letter-spacing: 0.05em;
}

/* ==========================================
   联系表单 - 水墨风格
   ========================================== */
.contact {
    background: var(--paper-white);
}

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xxl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.contact-item h4 {
    font-family: var(--font-title);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
    color: var(--ink-black);
    letter-spacing: 0.1em;
}

.contact-item p {
    color: var(--ink-gray);
    letter-spacing: 0.05em;
}

.contact-item a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid rgba(91, 76, 69, 0.35);
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--accent-red);
    border-bottom-color: rgba(183, 68, 43, 0.45);
}

.contact-wecom {
    background: var(--paper-gray);
    border: 1px solid var(--paper-beige);
    padding: var(--spacing-md);
}

.contact-wecom img {
    display: block;
    width: 100%;
    max-width: 360px;
    border: 1px solid var(--paper-beige);
    background: #fff;
    margin-top: var(--spacing-sm);
}

.contact-wecom-tip {
    margin-top: var(--spacing-sm);
    font-size: 0.92rem;
}

.contact-form-container {
    background: var(--paper-gray);
    padding: var(--spacing-xl);
    border: 1px solid var(--paper-beige);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-form input,
.contact-form textarea {
    padding: 0.9rem 1.2rem;
    border: 1px solid var(--paper-beige);
    background: var(--paper-white);
    font-family: inherit;
    font-size: 1rem;
    color: var(--ink-black);
    transition: var(--transition);
    letter-spacing: 0.05em;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-red);
    box-shadow: 0 0 0 3px rgba(200,85,61,0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 140px;
}

.contact-form button {
    align-self: flex-start;
}

/* ==========================================
   页脚 - 水墨风格
   ========================================== */
.footer {
    background: var(--ink-black);
    color: var(--paper-gray);
    padding: var(--spacing-xl) 0;
    text-align: center;
    letter-spacing: 0.1em;
}

.色卡面板 {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 70;
    width: 184px;
    border: 1px solid var(--paper-beige);
    background: rgba(246, 242, 234, 0.95);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    box-shadow: 0 12px 28px rgba(22, 19, 17, 0.14);
    padding: 0.6rem 0.62rem;
}

.色卡面板 h4 {
    margin: 0 0 0.45rem;
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    color: var(--ink-black);
    font-family: var(--font-title);
}

.色卡列表 {
    display: grid;
    gap: 0.28rem;
}

.色卡项 {
    display: grid;
    grid-template-columns: 16px 1fr;
    gap: 0.42rem;
    align-items: center;
    color: var(--ink-gray);
    font-size: 0.7rem;
    line-height: 1;
}

.色块 {
    width: 16px;
    height: 16px;
    border: 1px solid rgba(0, 0, 0, 0.12);
    border-radius: 3px;
}

.色卡项 code {
    font-family: ui-monospace, 'SFMono-Regular', 'Consolas', monospace;
    font-size: 0.68rem;
}

.色块.色一 { background: var(--色一); }
.色块.色二 { background: var(--色二); }
.色块.色三 { background: var(--色三); }
.色块.色四 { background: var(--色四); }
.色块.色五 { background: var(--色五); }
.色块.色六 { background: var(--色六); }
.色块.色七 { background: var(--色七); }
.色块.色八 { background: var(--色八); }
.色块.色九 { background: var(--色九); }

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--paper-white);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--paper-beige);
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition);
        pointer-events: none;
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-menu li {
        padding: var(--spacing-sm) 0;
        border-bottom: 1px solid var(--paper-beige);
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }

    .case-card {
        grid-template-columns: 1fr;
    }

    .case-image {
        border-right: none;
        border-bottom: 1px solid var(--paper-beige);
    }

    .色卡面板 {
        display: none;
    }

    .contact-wecom img {
        max-width: 100%;
    }
}