/* ===================================
   动画效果样式 - Animations Stylesheet
   =================================== */

/* ===================================
   基础动画类
   =================================== */

/* Fade In */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Fade In Left */
.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Fade In Right */
.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Scale In */
.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* ===================================
   数字滚动动画
   =================================== */

@keyframes countUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-number {
    animation: countUp 1s ease both;
}

/* ===================================
   按钮悬停动画
   =================================== */

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(44, 110, 168, 0.4);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(44, 110, 168, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(44, 110, 168, 0);
    }
}

.btn-primary:hover {
    animation: pulse 1.5s infinite;
}

/* ===================================
   卡片悬停效果
   =================================== */

.feature-card,
.curriculum-card,
.news-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover,
.curriculum-card:hover,
.news-card:hover {
    transform: translateY(-10px);
}

/* ===================================
   导航栏滚动效果
   =================================== */

.header {
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* ===================================
   语言切换按钮动画
   =================================== */

@keyframes rotateIcon {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.language-switch:hover i {
    animation: rotateIcon 0.5s ease;
}

/* ===================================
   返回顶部按钮动画
   =================================== */

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.back-to-top.visible {
    animation: slideInRight 0.3s ease;
}

/* ===================================
   表单输入框焦点动画
   =================================== */

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 110, 168, 0.1);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

/* ===================================
   图片懒加载效果
   =================================== */

img.lazy {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img.lazy.loaded {
    opacity: 1;
}

/* ===================================
   Loading Spinner
   =================================== */

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--medium-gray);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ===================================
   页面加载动画
   =================================== */

@keyframes pageLoader {
    0% {
        transform: scaleX(0);
        transform-origin: left;
    }
    50% {
        transform: scaleX(1);
        transform-origin: left;
    }
    50.1% {
        transform-origin: right;
    }
    100% {
        transform: scaleX(0);
        transform-origin: right;
    }
}

.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    z-index: 9999;
    animation: pageLoader 1s ease both;
}

/* ===================================
   移动端菜单动画
   =================================== */

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.main-nav.active {
    animation: slideInDown 0.3s ease;
}

/* ===================================
   工具提示动画
   =================================== */

@keyframes tooltipFade {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tooltip {
    animation: tooltipFade 0.2s ease;
}

/* ===================================
   Smooth Scroll
   =================================== */

html {
    scroll-behavior: smooth;
}

/* ===================================
   Selection Color
   =================================== */

::selection {
    background: var(--primary-color);
    color: var(--white);
}

::-moz-selection {
    background: var(--primary-color);
    color: var(--white);
}

/* ===================================
   Scrollbar Styling (Webkit browsers)
   =================================== */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}