/* ===================================
   responsive.css - 响应式样式
   描述：YiCore 企业网站响应式布局
   =================================== */

/* -----------------------------------
   移动端优先响应式断点
   断点参考：
   - xs: < 576px (手机竖屏)
   - sm: ≥ 576px (手机横屏)
   - md: ≥ 768px (平板)
   - lg: ≥ 992px (小屏桌面)
   - xl: ≥ 1200px (标准桌面)
   - 2xl: ≥ 1400px (大屏桌面)
   ----------------------------------- */

/* ===================================
   Extra Large (≥1400px) - 大屏桌面
   =================================== */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }

    .hero__title {
        font-size: 4.5rem;
    }

    .stats-grid {
        gap: var(--spacing-2xl);
    }
}

/* ===================================
   Large (≥1200px) - 标准桌面
   =================================== */
@media (max-width: 1399.98px) {
    .hero__title {
        font-size: 3.5rem;
    }

    .section-header__title {
        font-size: 2.5rem;
    }
}

/* ===================================
   Medium-Large (≥992px) - 小屏桌面
   =================================== */
@media (max-width: 1199.98px) {
    :root {
        --font-size-5xl: 2.5rem;
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }

    .hero__title {
        font-size: 3rem;
    }

    .hero__description {
        font-size: 1.125rem;
    }

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

    .footer-main {
        grid-template-columns: 1fr 1fr 1fr;
    }

    .footer-brand {
        grid-column: 1 / -1;
        max-width: 100%;
        text-align: center;
        margin-bottom: var(--spacing-xl);
    }

    .footer-social {
        justify-content: center;
    }

    .partners-grid {
        grid-template-columns: repeat(4, 1fr);
    }

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

    .process-step::after {
        display: none;
    }
}

/* ===================================
   Medium (≥768px) - 平板
   =================================== */
@media (max-width: 991.98px) {
    :root {
        --navbar-height: 70px;
        --spacing-4xl: 4rem;
        --spacing-3xl: 3rem;
    }

    /* 导航栏移动端样式 */
    .main-header__nav {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        bottom: 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--spacing-xl);
        background: var(--gradient-dark);
        transform: translateX(100%);
        transition: transform var(--transition-base);
        z-index: calc(var(--z-fixed) - 1);
        overflow-y: auto;
    }

    .main-header__nav.is-active {
        transform: translateX(0);
    }

    .main-header__link {
        font-size: var(--font-size-xl);
    }

    .main-header__toggle {
        display: flex;
    }

    /* Hero */
    .hero {
        min-height: auto;
        padding: calc(var(--navbar-height) + var(--spacing-3xl)) 0 var(--spacing-3xl);
    }

    .hero__title {
        font-size: 2.5rem;
    }

    .hero__scroll {
        display: none;
    }

    /* About */
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .about-image__float {
        position: relative;
        bottom: auto;
        right: auto;
        margin-top: var(--spacing-lg);
    }

    /* Contact */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* Timeline */
    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        width: 100%;
        left: 0 !important;
        text-align: left !important;
        padding-left: 60px !important;
        padding-right: 0 !important;
    }

    .timeline-item__dot {
        left: 10px !important;
        right: auto !important;
    }

    /* Footer */
    .footer-main {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-2xl);
    }

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

/* ===================================
   Small (≥576px) - 手机横屏
   =================================== */
@media (max-width: 767.98px) {
    :root {
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --spacing-4xl: 3rem;
        --spacing-3xl: 2rem;
        --spacing-2xl: 1.5rem;
    }

    .container {
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }

    /* Hero */
    .hero__title {
        font-size: 2rem;
    }

    .hero__description {
        font-size: 1rem;
    }

    .hero__buttons {
        flex-direction: column;
        width: 100%;
    }

    .hero__buttons .btn {
        width: 100%;
    }

    .hero__badge {
        font-size: var(--font-size-xs);
    }

    /* Section Header */
    .section-header__title {
        font-size: 1.75rem;
    }

    .section-header__description {
        font-size: var(--font-size-base);
    }

    /* Stats */
    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }

    .stat-item {
        padding: var(--spacing-lg);
    }

    .stat-item__number {
        font-size: 2rem;
    }

    .stat-item__label {
        font-size: var(--font-size-sm);
    }

    /* Service Process */
    .service-process {
        grid-template-columns: 1fr;
    }

    /* Portfolio */
    .portfolio-filter {
        flex-wrap: wrap;
    }

    .filter-btn {
        font-size: var(--font-size-sm);
    }

    /* Partners */
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-md);
    }

    .partner-item img {
        max-width: 80px;
    }

    /* CTA */
    .cta__title {
        font-size: 1.75rem;
    }

    .cta__description {
        font-size: var(--font-size-base);
    }

    /* Footer */
    .footer-main {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-nav__list {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-sm);
    }

    .footer-nav__list li {
        margin-bottom: 0;
    }

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

    .footer-contact__item {
        justify-content: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    /* About Features */
    .about-features {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Extra Small (< 576px) - 手机竖屏
   =================================== */
@media (max-width: 575.98px) {
    :root {
        --font-size-5xl: 1.75rem;
        --font-size-4xl: 1.5rem;
        --spacing-2xl: 1rem;
    }

    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    /* Hero */
    .hero__content {
        padding: var(--spacing-xl) var(--spacing-sm);
    }

    .hero__title {
        font-size: 1.75rem;
    }

    /* Buttons */
    .btn {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-sm);
    }

    .btn-lg {
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: var(--font-size-base);
    }

    /* Cards */
    .service-card {
        padding: var(--spacing-lg);
    }

    .service-card__icon {
        width: 60px;
        height: 60px;
        font-size: 28px;
    }

    .service-card__title {
        font-size: var(--font-size-lg);
    }

    .card-body {
        padding: var(--spacing-md);
    }

    /* Stats */
    .stat-item__number {
        font-size: 1.75rem;
    }

    /* Partners */
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Form */
    .form-control {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .contact-form {
        padding: var(--spacing-lg);
    }

    .contact-info {
        padding: var(--spacing-lg);
    }

    /* Timeline */
    .timeline-item {
        padding-left: 50px !important;
    }

    .timeline::before {
        left: 15px;
    }

    .timeline-item__dot {
        left: 5px !important;
        width: 16px;
        height: 16px;
    }

    .timeline-item__content {
        padding: var(--spacing-md);
    }

    /* 返回顶部按钮 */
    .back-to-top {
        width: 44px;
        height: 44px;
        bottom: 20px;
        right: 20px;
        font-size: 18px;
    }
}

/* ===================================
   触控设备优化
   =================================== */
@media (hover: none) {
    .portfolio-card__overlay {
        opacity: 1;
    }

    .portfolio-card__content {
        transform: translateY(0);
        opacity: 1;
    }

    .service-card:hover {
        transform: none;
    }

    .btn:hover {
        transform: none;
    }
}

/* ===================================
   高分辨率屏幕
   =================================== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* 高分辨率图片使用 2x 版本 */
}

/* ===================================
   打印样式
   =================================== */
@media print {
    .main-header,
    .footer,
    .hero__scroll,
    .btn,
    .portfolio-filter,
    [data-aos] {
        display: none !important;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
        color: #000;
        background: #fff;
    }

    h1, h2, h3 {
        page-break-after: avoid;
    }

    img {
        max-width: 100% !important;
    }

    a[href]::after {
        content: " (" attr(href) ")";
        font-size: 10pt;
        color: #666;
    }
}

/* ===================================
   深色模式支持（可选）
   =================================== */
@media (prefers-color-scheme: dark) {
    /* 如果需要支持系统深色模式，可在此添加样式 */
}

/* ===================================
   减少动画偏好
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    [data-aos] {
        opacity: 1;
        transform: none;
    }
}

/* ===================================
   横屏手机特殊处理
   =================================== */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        min-height: auto;
        padding: calc(var(--navbar-height) + var(--spacing-lg)) 0 var(--spacing-lg);
    }

    .hero__title {
        font-size: 2rem;
    }

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