/* css/sustainability-page.css */

:root {
    --color-bg: #ffffff;
    --color-bg-alt: #f9f9f9;
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-accent: #2c5e2e;
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    --transition-smooth: all 0.5s cubic-bezier(0.25, 1, 0.5, 1); /* 更高级的缓动 */
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden; /* 防止横向滚动条 */
}

/* Hero Section */
.sustainability-hero {
    position: relative;
    height: 90vh; /* 更高一点 */
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    overflow: hidden;
    background-image: url('../images/cf1GsMoiLOF7oP2n.jpeg');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.active {
    color: var(--color-accent);
    font-weight: 600;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    position: relative;
    z-index: 2;
    transform: translateZ(0);
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 5rem;
    font-weight: 500;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    opacity: 0; /* JS 控制显示 */
    transform: translateY(50px);
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0; /* JS 控制显示 */
    transform: translateY(30px);
}

/* Intro Section */
.intro-section {
    padding: 120px 0;
}

.intro-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.intro-text h2 {
    font-family: var(--font-heading);
    font-size: 3rem;
    margin-bottom: 30px;
    color: var(--color-accent);
}

.intro-text p {
    font-size: 1.25rem;
    color: var(--color-text-light);
    line-height: 1.8;
}

/* Pillars Section */
.pillars-section {
    padding: 120px 0;
    background-color: var(--color-bg-alt);
}

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

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 3rem;
    margin-bottom: 15px;
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.pillar-card {
    background: #fff;
    padding: 50px 30px;
    border: 1px solid transparent;
    transition: var(--transition-smooth);
    opacity: 0; /* JS 控制 */
    transform: translateY(30px);
}

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

.pillar-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 30px;
    color: var(--color-accent);
}

.pillar-card h3 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    margin-bottom: 15px;
}

/* Targets Section */
.targets-section {
    padding: 120px 0;
    overflow: hidden; /* 视差需要 */
}

.targets-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.targets-content h2 {
    font-family: var(--font-heading);
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--color-accent);
}

.targets-list {
    list-style: none;
    padding: 0;
    margin-top: 50px;
}

.target-item {
    display: flex;
    align-items: baseline;
    margin-bottom: 35px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
    opacity: 0; /* JS 控制 */
    transform: translateX(-20px);
}

.target-number, .target-word {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-right: 20px;
    min-width: 100px;
    line-height: 1;
}

.unit {
    font-size: 1.5rem;
    vertical-align: super;
}

.target-desc {
    font-size: 1.1rem;
    color: var(--color-text-light);
    padding-top: 10px;
}

.targets-image {
    position: relative;
    height: 600px;
    overflow: hidden;
}

.targets-image img {
    width: 100%;
    height: 120%; /* 视差高度 */
    object-fit: cover;
}

/* Reports Section */
.reports-section {
    padding: 120px 0;
    background-color: var(--color-bg-alt);
}

.reports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
}

.report-card {
    display: flex;
    align-items: center;
    background: #fff;
    padding: 30px;
    text-decoration: none;
    color: var(--color-text);
    border: 1px solid #eee;
    transition: var(--transition-smooth);
    opacity: 0; /* JS 控制 */
    transform: translateY(20px);
}

.report-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

.report-icon {
    font-weight: 700;
    color: #d32f2f;
    margin-right: 20px;
    font-size: 0.9rem;
    border: 2px solid #d32f2f;
    padding: 5px 8px;
    border-radius: 4px;
}

/* CTA */
.sustainability-cta {
    padding: 120px 0;
    text-align: center;
}

.btn-primary {
    display: inline-block;
    padding: 18px 40px;
    background-color: var(--color-accent);
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
    margin-top: 20px;
}

.btn-primary:hover {
    background-color: #1e4220;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(44, 94, 46, 0.2);
}

/* Responsive */
@media (max-width: 992px) {
    .hero-title { font-size: 3.5rem; }
    .targets-layout { grid-template-columns: 1fr; }
    .targets-image { height: 400px; order: -1; }
}

@media (max-width: 768px) {
    .hero-title { font-size: 2.5rem; }
    .pillar-card { padding: 30px 20px; }
    .target-number { font-size: 2.5rem; }
}