/* ===================================
   全局变量和重置
   =================================== */

:root {
    /* 颜色 */
    --color-bg-primary: #f8f6f3;
    --color-bg-white: #ffffff;
    --color-bg-dark: #1a1a1a;
    --color-bg-dark-light: #2a2a2a;

    --color-text-primary: #1a1a1a;
    --color-text-secondary: #444;
    --color-text-tertiary: #666;
    --color-text-light: #999;
    --color-text-inverse: #f8f6f3;

    --color-accent: #c94a4a;
    --color-accent-hover: #b03d3d;

    /* 字体 */
    --font-serif: 'Noto Serif SC', serif;
    --font-serif-en: 'Cormorant Garamond', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;
    --spacing-4xl: 120px;

    /* 容器宽度 */
    --container-max: 1200px;
    --container-narrow: 900px;
    --container-xs: 600px;

    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.4s ease;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-serif);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-fast);
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===================================
   通用组件
   =================================== */

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-3xl);
}

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--spacing-3xl);
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.section-subtitle {
    font-size: 18px;
    text-align: center;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-4xl);
}

.section-subtitle-en {
    font-family: var(--font-serif-en);
    font-size: 16px;
    text-align: center;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-4xl);
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 16px 32px;
    font-size: 16px;
    font-weight: 500;
    border-radius: 4px;
    transition: var(--transition-fast);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
}

.btn-primary:hover {
    background-color: #333;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    border: 2px solid var(--color-text-primary);
    color: var(--color-text-primary);
    background-color: transparent;
}

.btn-secondary:hover {
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
    transform: translateY(-2px);
}

/* 文字链接 */
.text-link {
    font-size: 14px;
    color: var(--color-text-primary);
    position: relative;
    display: inline-block;
}

.text-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-text-primary);
    transition: width var(--transition-normal);
}

.text-link:hover::after {
    width: 100%;
}

/* ===================================
   [1] 导航栏
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 72px;
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background-color: rgba(248, 246, 243, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-3xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-text-primary);
}

.logo-subtitle {
    font-family: var(--font-serif-en);
    font-size: 12px;
    color: var(--color-text-tertiary);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-menu a {
    font-size: 16px;
    color: var(--color-text-primary);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-text-primary);
    transition: width var(--transition-normal);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.language-switch {
    font-size: 14px;
    color: var(--color-text-tertiary);
}

.language-switch a {
    color: var(--color-text-tertiary);
}

.language-switch a.active {
    color: var(--color-text-primary);
    font-weight: 500;
}

.language-switch a:hover {
    color: var(--color-text-primary);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 24px;
    height: 24px;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: var(--transition-fast);
}

/* ===================================
   [2] Hero区
   =================================== */

.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to bottom, rgba(248, 246, 243, 0.3), rgba(248, 246, 243, 0.8)),
                url('../images/hero-bg.jpg') center/cover no-repeat;
    z-index: -1;
}

.hero-content {
    text-align: center;
    max-width: 900px;
    padding: 0 var(--spacing-md);
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.hero-subtitle-en {
    font-family: var(--font-serif-en);
    font-size: 24px;
    font-style: italic;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-description {
    font-size: 20px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.4s forwards;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.6s forwards;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    color: var(--color-text-tertiary);
    animation: float 2s ease-in-out infinite;
}

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

@keyframes float {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

/* ===================================
   [3] 问题陈述区
   =================================== */

.problem-statement {
    background-color: var(--color-bg-white);
    padding: var(--spacing-4xl) 0;
}

.three-columns {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.column {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.column.animate {
    opacity: 1;
    transform: translateY(0);
}

.column-title {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.column-text {
    font-size: 16px;
    color: var(--color-text-secondary);
    line-height: 1.9;
}

/* ===================================
   [4] WISE-A框架区
   =================================== */

.wise-framework {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-4xl) 0;
}

.framework-content {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.framework-image {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.framework-image.animate {
    opacity: 1;
    transform: translateY(0);
}

.framework-image img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: var(--shadow-md);
}

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

.step {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.step.animate {
    opacity: 1;
    transform: translateX(0);
}

.step-label {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--color-text-primary);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
}

.step-content h4 {
    font-size: 18px;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

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

.step-connector {
    width: 2px;
    height: 24px;
    background-color: var(--color-text-tertiary);
    margin-left: 23px;
    opacity: 0.3;
}

.framework-cta {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ===================================
   [5] 精选作品区
   =================================== */

.featured-works {
    background-color: var(--color-bg-white);
    padding: var(--spacing-4xl) 0;
}

.works-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.work-card {
    background-color: var(--color-bg-white);
    border-radius: 4px;
    overflow: hidden;
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
}

.work-card.animate {
    opacity: 1;
    transform: translateY(0);
}

.work-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.work-image {
    width: 100%;
    height: 240px;
    overflow: hidden;
}

.work-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-normal);
}

.work-card:hover .work-image img {
    transform: scale(1.05);
}

.work-content {
    padding: var(--spacing-md);
}

.work-category {
    display: inline-block;
    font-size: 12px;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.work-title {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.work-excerpt {
    font-size: 16px;
    color: var(--color-text-tertiary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.work-link {
    font-size: 14px;
    color: var(--color-text-primary);
    font-weight: 500;
}

.works-cta {
    text-align: center;
}

/* ===================================
   [6] 个人陈述区
   =================================== */

.personal-statement {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-4xl) 0;
}

.statement-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.statement-image {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.statement-image.animate {
    opacity: 1;
    transform: translateY(0);
}

.statement-image img {
    width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.statement-image:hover img {
    transform: scale(1.02);
}

.statement-text {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.statement-text.animate {
    opacity: 1;
    transform: translateY(0);
}

.statement-quote {
    font-size: 24px;
    font-style: italic;
    line-height: 2.0;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

.statement-author {
    margin-bottom: var(--spacing-md);
}

.author-name {
    font-size: 16px;
    color: var(--color-text-tertiary);
    margin-bottom: var(--spacing-xs);
}

.author-title {
    font-size: 14px;
    color: var(--color-accent);
}

/* ===================================
   [7] 行动召唤区
   =================================== */

.cta-section {
    background-color: var(--color-bg-dark);
    color: var(--color-text-inverse);
    padding: var(--spacing-3xl) 0;
    text-align: center;
}

.cta-title {
    font-size: 32px;
    font-weight: 500;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-sm);
}

.cta-subtitle {
    font-size: 16px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.newsletter-form {
    display: flex;
    gap: 0;
    max-width: 500px;
    margin: 0 auto var(--spacing-md);
}

.email-input {
    flex: 1;
    height: 56px;
    padding: 0 var(--spacing-md);
    background-color: var(--color-bg-dark-light);
    border: none;
    border-radius: 4px 0 0 4px;
    color: var(--color-text-inverse);
    font-size: 16px;
    font-family: var(--font-serif);
}

.email-input:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: -2px;
}

.email-input::placeholder {
    color: var(--color-text-light);
}

.submit-btn {
    height: 56px;
    padding: 0 var(--spacing-lg);
    background-color: var(--color-accent);
    color: var(--color-text-inverse);
    font-size: 16px;
    font-weight: 500;
    border-radius: 0 4px 4px 0;
    transition: var(--transition-fast);
}

.submit-btn:hover {
    background-color: var(--color-accent-hover);
}

.social-proof {
    font-size: 14px;
    color: var(--color-text-light);
}

.social-proof span {
    color: var(--color-accent);
    font-weight: 500;
}

.success-message {
    display: none;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    color: var(--color-accent);
}

.success-message.show {
    display: flex;
    animation: fadeInUp 0.4s ease;
}

.checkmark {
    font-size: 24px;
}

/* ===================================
   [8] 页脚
   =================================== */

.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    padding: var(--spacing-2xl) var(--spacing-3xl) var(--spacing-lg);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    font-size: 20px;
    font-weight: 500;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-xs);
}

.footer-tagline-en {
    font-family: var(--font-serif-en);
    font-size: 12px;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    font-size: 14px;
    color: var(--color-text-light);
}

.footer-heading {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-md);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    font-size: 14px;
    color: var(--color-text-light);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-text-inverse);
}

.footer-bottom {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright,
.built-with {
    font-size: 14px;
    color: var(--color-text-light);
}

/* ===================================
   响应式设计
   =================================== */

/* 平板 */
@media (max-width: 1199px) {
    .container,
    .nav-container {
        padding: 0 var(--spacing-xl);
    }

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

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

    .framework-content {
        grid-template-columns: 1fr;
    }

    .framework-image {
        max-width: 400px;
        margin: 0 auto;
    }
}

/* 移动端 */
@media (max-width: 767px) {
    .container,
    .container-narrow,
    .nav-container {
        padding: 0 var(--spacing-md);
    }

    /* 导航栏 */
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-md);
        transform: translateX(100%);
        transition: var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .hamburger {
        display: flex;
    }

    /* Hero */
    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle-en {
        font-size: 18px;
    }

    .hero-description {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    /* 通用 */
    .section-title {
        font-size: 32px;
    }

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

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

    .statement-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .statement-image {
        max-width: 280px;
        margin: 0 auto;
    }

    .statement-quote {
        font-size: 20px;
    }

    .newsletter-form {
        flex-direction: column;
    }

    .email-input,
    .submit-btn {
        border-radius: 4px;
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}