/* 瑞丽市汀兰珠宝有限公司 - 网站样式表 */

/* --- 1. 设计系统与变量 --- */
:root {
    /* 颜色体系 - 淡色系/奢华绿金 */
    --bg-primary: #FAF9F5;       /* 象牙白/暖白 */
    --bg-secondary: #F3F1EA;     /* 浅米色 */
    --bg-card: #FFFFFF;          /* 纯白 */
    --bg-overlay: rgba(250, 249, 245, 0.95);
    
    --primary-color: #2C5E43;    /* 传世翡翠绿 */
    --primary-light: #F0F4F1;    /* 浅绿底色 */
    --primary-dark: #1C402D;     /* 深绿 */
    
    --accent-gold: #C5A880;      /* 哑光香槟金 */
    --accent-gold-hover: #B0936C;
    --accent-gold-light: #F6F2EB;
    
    --text-main: #2C2A29;        /* 暖炭黑 */
    --text-muted: #6E6A67;       /* 灰褐 */
    --text-light: #9E9995;       /* 浅灰 */
    
    --border-color: #E6E2D8;     /* 浅边框 */
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.03);
    --shadow-md: 0 8px 24px rgba(44, 94, 67, 0.06);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.08);
    
    /* 字体族 */
    --font-serif: "Playfair Display", "Noto Serif SC", "Source Han Serif SC", "Georgia", "STSong", "SimSun", serif;
    --font-sans: "Inter", "Montserrat", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    
    /* 动效过渡 */
    --transition-fast: all 0.25s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-normal: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-slow: all 0.7s cubic-bezier(0.25, 0.8, 0.25, 1);
    
    --max-width: 1280px;
    --header-height: 80px;
}

/* --- 2. 基础重置 --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.7;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

button, input, textarea {
    font-family: inherit;
    border: none;
    outline: none;
    background: none;
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--accent-gold);
    border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

/* --- 3. 布局与通用组件 --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 40px;
    width: 100%;
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: 0;
    font-size: 0.9rem;
    letter-spacing: 2px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
    text-transform: uppercase;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #FFFFFF;
    border: 1px solid var(--primary-color);
}

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

.btn-outline {
    border: 1px solid var(--accent-gold);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--accent-gold);
    color: #FFFFFF;
    transform: translateY(-2px);
}

/* 章节头部 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-subtitle {
    font-family: var(--font-serif);
    color: var(--accent-gold);
    font-size: 1.1rem;
    letter-spacing: 4px;
    text-transform: uppercase;
    display: block;
    margin-bottom: 12px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    color: var(--primary-color);
    font-weight: 400;
    position: relative;
    padding-bottom: 20px;
    letter-spacing: 2px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background-color: var(--accent-gold);
}

/* 分割装饰线 */
.deco-line {
    width: 100px;
    height: 1px;
    background-color: var(--border-color);
    margin: 40px auto;
    position: relative;
}
.deco-line::before {
    content: '♦';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent-gold);
    font-size: 10px;
    background-color: var(--bg-primary);
    padding: 0 10px;
}

/* --- 4. 头部导航 (Navigation) --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    z-index: 1000;
    transition: var(--transition-normal);
    background-color: rgba(250, 249, 245, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
}

.header.scrolled {
    height: 70px;
    background-color: #FFFFFF;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.logo-main {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 500;
    letter-spacing: 2px;
    color: var(--primary-color);
}

.logo-sub {
    font-size: 0.65rem;
    letter-spacing: 4px;
    color: var(--accent-gold);
    text-transform: uppercase;
    margin-top: 2px;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 0.9rem;
    letter-spacing: 2px;
    font-weight: 400;
    color: var(--text-main);
    position: relative;
    padding: 8px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-gold);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-color);
}

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

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 1001;
}

.menu-toggle span {
    width: 24px;
    height: 1.5px;
    background-color: var(--primary-color);
    transition: var(--transition-fast);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background-color: var(--bg-card);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
        box-shadow: var(--shadow-lg);
        transition: var(--transition-normal);
        z-index: 1000;
    }
    
    .nav-menu.open {
        right: 0;
    }
    
    .header.scrolled .nav-menu {
        background-color: var(--bg-card);
    }

    .menu-toggle.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .menu-toggle.open span:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.open span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}

/* --- 5. 首屏幻灯片 (Hero Section) --- */
.hero {
    height: 85vh;
    min-height: 550px;
    position: relative;
    overflow: hidden;
    margin-top: 0;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    display: flex;
    align-items: center;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(250, 249, 245, 0.9) 30%, rgba(250, 249, 245, 0.3) 100%);
}

@media (max-width: 768px) {
    .hero-overlay {
        background: rgba(250, 249, 245, 0.85);
    }
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 600px;
}

.hero-subtitle {
    font-family: var(--font-serif);
    color: var(--accent-gold);
    font-size: 1.2rem;
    letter-spacing: 6px;
    margin-bottom: 20px;
    display: block;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: 3.2rem;
    font-weight: 400;
    color: var(--primary-color);
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.hero-description {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    line-height: 1.8;
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.4rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
}

/* --- 6. 关于我们 (About Us) --- */
.about {
    padding: 100px 0;
    background-color: var(--bg-primary);
}

.about-wrapper {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 80px;
    align-items: center;
}

@media (max-width: 992px) {
    .about-wrapper {
        grid-template-columns: 1fr;
        gap: 50px;
    }
}

.about-content {
    padding-right: 20px;
}

.about-title-group {
    margin-bottom: 30px;
}

.about-tag {
    color: var(--accent-gold);
    font-size: 0.9rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 10px;
    display: block;
}

.about-main-title {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    color: var(--primary-color);
    font-weight: 400;
    margin-bottom: 15px;
}

.about-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-family: var(--font-serif);
}

.about-text {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 30px;
    text-align: justify;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

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

.feature-title {
    font-family: var(--font-serif);
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.feature-title::before {
    content: '♦';
    color: var(--accent-gold);
    font-size: 8px;
}

.feature-desc {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* 关于我们插图装饰 */
.about-image-container {
    position: relative;
    padding: 20px;
}

.about-image-frame {
    border: 1px solid var(--accent-gold);
    padding: 15px;
    position: relative;
}

.about-image-frame img {
    width: 100%;
    height: 480px;
    object-fit: cover;
    filter: grayscale(10%);
    transition: var(--transition-slow);
}

.about-image-frame:hover img {
    filter: grayscale(0%);
    transform: scale(1.02);
}

.about-deco-box {
    position: absolute;
    width: 100px;
    height: 100px;
    border: 1px solid var(--primary-color);
    z-index: -1;
}

.deco-top-left {
    top: 0;
    left: 0;
}

.deco-bottom-right {
    bottom: 0;
    right: 0;
}

/* --- 7. 臻品展示 (Products Section) --- */
.products {
    padding: 100px 0;
    background-color: var(--bg-secondary);
}

.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 50px;
}

.filter-btn {
    font-family: var(--font-serif);
    font-size: 1rem;
    letter-spacing: 2px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 10px 16px;
    position: relative;
    transition: var(--transition-fast);
}

.filter-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 1.5px;
    background-color: var(--primary-color);
    transition: var(--transition-fast);
}

.filter-btn:hover {
    color: var(--primary-color);
}

.filter-btn.active {
    color: var(--primary-color);
    font-weight: 500;
}

.filter-btn.active::after {
    width: 40px;
}

/* 产品网格 */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 40px;
}

.product-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: var(--transition-normal);
    position: relative;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-gold);
}

.product-img-box {
    position: relative;
    overflow: hidden;
    height: 300px;
    background-color: #FAF9F6;
}

.product-img-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.product-card:hover .product-img-box img {
    transform: scale(1.08);
}

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(44, 94, 67, 0.1);
    opacity: 0;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.btn-view-detail {
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--primary-color);
    padding: 10px 24px;
    font-size: 0.85rem;
    letter-spacing: 1px;
    border: 1px solid var(--accent-gold);
    box-shadow: var(--shadow-sm);
    transform: translateY(20px);
    transition: var(--transition-normal);
}

.product-card:hover .btn-view-detail {
    transform: translateY(0);
}

.product-info {
    padding: 24px;
    text-align: center;
}

.product-name {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    color: var(--text-main);
    margin-bottom: 8px;
    transition: var(--transition-fast);
}

.product-card:hover .product-name {
    color: var(--primary-color);
}

.product-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-tags {
    display: flex;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    font-size: 0.75rem;
    background-color: var(--primary-light);
    color: var(--primary-color);
    padding: 3px 10px;
    border-radius: 0;
    border: 1px solid rgba(44, 94, 67, 0.1);
}

/* --- 8. 尊尚定制 (Service / Features Grid) --- */
.custom-service {
    padding: 100px 0;
    background-color: var(--bg-primary);
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

@media (max-width: 992px) {
    .service-grid {
        grid-template-columns: 1fr;
    }
}

.service-card {
    text-align: center;
    padding: 50px 30px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    transition: var(--transition-normal);
    position: relative;
}

.service-card:hover {
    border-color: var(--accent-gold);
    box-shadow: var(--shadow-sm);
    transform: translateY(-5px);
}

.service-icon {
    font-size: 2.2rem;
    color: var(--accent-gold);
    margin-bottom: 24px;
    line-height: 1;
}

.service-title {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 16px;
    font-weight: 400;
}

.service-desc {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.8;
}

/* --- 9. 联系我们 (Contact Section) --- */
.contact {
    padding: 100px 0;
    background-color: var(--bg-secondary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 80px;
}

@media (max-width: 992px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 50px;
    }
}

/* 留言表单 */
.contact-form-container {
    background-color: var(--bg-card);
    padding: 50px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

@media (max-width: 576px) {
    .contact-form-container {
        padding: 30px 20px;
    }
}

.form-title {
    font-family: var(--font-serif);
    font-size: 1.6rem;
    color: var(--primary-color);
    margin-bottom: 30px;
    font-weight: 400;
    position: relative;
    padding-bottom: 12px;
}

.form-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 1px;
    background-color: var(--accent-gold);
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-size: 0.85rem;
    letter-spacing: 1px;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
    font-size: 0.95rem;
    color: var(--text-main);
    transition: var(--transition-fast);
}

.form-control:focus {
    border-bottom-color: var(--primary-color);
}

textarea.form-control {
    min-height: 120px;
    resize: none;
}

/* 联系方式详情 */
.contact-info-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.info-lead {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.info-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 40px;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

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

.contact-icon {
    width: 44px;
    height: 44px;
    border: 1px solid var(--accent-gold);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-gold);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.contact-text-box h4 {
    font-family: var(--font-serif);
    font-size: 1rem;
    color: var(--text-main);
    margin-bottom: 6px;
    font-weight: 400;
}

.contact-text-box p {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- 10. 页脚 (Footer) --- */
.footer {
    background-color: #1E2320; /* 极深墨绿底色，衬托尊贵 */
    color: #ECEAE6;
    padding: 80px 0 30px;
    font-size: 0.9rem;
    border-top: 2px solid var(--accent-gold);
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

@media (max-width: 768px) {
    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

.footer-brand .logo-main {
    color: #FFFFFF;
}

.footer-about {
    font-size: 0.85rem;
    color: #A3A09B;
    margin-top: 20px;
    line-height: 1.8;
}

.footer-title {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    color: var(--accent-gold);
    margin-bottom: 24px;
    letter-spacing: 2px;
    font-weight: 400;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: #A3A09B;
    font-size: 0.85rem;
}

.footer-links a:hover {
    color: var(--accent-gold);
    padding-left: 5px;
}

.footer-contact-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
    color: #A3A09B;
    font-size: 0.85rem;
}

.footer-contact-info span {
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    font-size: 0.8rem;
    color: #7D7A75;
}

.footer-icp {
    display: flex;
    gap: 20px;
}

.footer-icp a:hover {
    color: var(--accent-gold);
}

@media (max-width: 576px) {
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    .footer-icp {
        flex-direction: column;
        gap: 10px;
    }
}

/* --- 11. 臻品展示详情弹窗 (Lightbox Modal) --- */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-normal);
}

.modal.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(26, 30, 28, 0.65);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.modal-content-wrapper {
    position: relative;
    z-index: 10;
    background-color: var(--bg-primary);
    width: 90%;
    max-width: 900px;
    height: auto;
    max-height: 85vh;
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--accent-gold);
    overflow: hidden;
    transform: translateY(30px);
    transition: var(--transition-normal);
}

@media (max-width: 768px) {
    .modal-content-wrapper {
        grid-template-columns: 1fr;
        max-height: 90vh;
        overflow-y: auto;
    }
}

.modal.open .modal-content-wrapper {
    transform: translateY(0);
}

.modal-close-btn {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--text-main);
    z-index: 15;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.modal-close-btn:hover {
    background-color: var(--primary-color);
    color: #FFFFFF;
    transform: rotate(90deg);
}

.modal-img-box {
    background-color: #FAF9F6;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    min-height: 350px;
}

.modal-img-box img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.modal-info-box {
    padding: 50px 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

@media (max-width: 576px) {
    .modal-info-box {
        padding: 30px 20px;
    }
}

.modal-category {
    font-family: var(--font-serif);
    color: var(--accent-gold);
    font-size: 0.9rem;
    letter-spacing: 2px;
    margin-bottom: 10px;
}

.modal-name {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    font-weight: 400;
}

.modal-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: 30px;
}

.modal-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.modal-actions {
    display: flex;
    gap: 20px;
}

.modal-actions .btn {
    flex: 1;
}

/* --- 12. 滚动动效 (Animations) --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}