/* ===== 基础重置与变量 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 深色模式 */
body.dark-mode {
    --bg-color: #020B1F;
    --text-color: #ffffff;
    --menu-right-bg: #020B1F;
    --menu-left-bg: #ffffff;
    --pill-bg: rgba(255,255,255,0.1);
    --pill-hover: rgba(255,255,255,0.2);
    --divider-color: rgba(255,255,255,0.2);
    --link-color: #ffffff;
    --lang-dropdown-bg: #111a2a;
    --button-hover-bg: rgba(255,255,255,0.25);
    transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease;
}
/* 浅色模式 */
body.light-mode {
    --bg-color: #ffffff;
    --text-color: #000000;
    --menu-right-bg: #ffffff;
    --menu-left-bg: #ffffff;
    --pill-bg: rgba(0,0,0,0.05);
    --pill-hover: rgba(0,0,0,0.1);
    --divider-color: rgba(0,0,0,0.1);
    --link-color: #000000;
    --lang-dropdown-bg: #f5f5f5;
    --button-hover-bg: rgba(0,0,0,0.15);
    transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
}

/* ===== 加载屏幕 ===== */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #000000;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.6s ease;
    pointer-events: auto;
}
#loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}
.loading-icon-container {
    transition: opacity 0.3s ease;
}
.loading-icon-container.hide {
    display: none;
}
.loading-icon {
    width: 200px;
    height: auto;
    display: block;
}
.progress-area {
    position: absolute;
    bottom: 30px;
    left: 30px;
    width: 260px;
    color: #ffffff;
}
.progress-text {
    font-size: 14px;
    margin-bottom: 6px;
    color: #cccccc;
}
.progress-bar-bg {
    width: 100%;
    height: 6px;
    background-color: #333333;
    border-radius: 3px;
    overflow: hidden;
}
.progress-bar-fill {
    height: 100%;
    width: 0%;
    background-color: #ffffff;
    border-radius: 3px;
    transition: width 0.2s ease;
}

/* 主内容区域淡入 */
#main-content {
    opacity: 0;
    transition: opacity 0.8s ease;
    min-height: 100vh;
}
#main-content.fade-in {
    opacity: 1;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    left: 20%;
    width: 60%;
    top: 5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    z-index: 300;
    pointer-events: none;
}
.navbar * {
    pointer-events: auto;
}
.logo-link {
    text-decoration: none;
    display: block;
}
.logo-container {
    transition: opacity 0.3s ease;
}
.logo-container.hide {
    opacity: 0;
    pointer-events: none;
}
.logo {
    height: 40px;
    width: auto;
}

/* 菜单按钮（汉堡图标） */
.menu-toggle {
    width: 40px;
    height: 40px;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
    border-radius: 50%;
}
.menu-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background-color: var(--text-color);
    border-radius: 2px;
    position: absolute;
    left: 8px;
    top: 50%;
    transform-origin: center;
    transition: transform 0.3s ease, opacity 0.3s ease;
}
.menu-toggle span:first-child {
    transform: translateY(calc(-50% - 6px));
}
.menu-toggle span:last-child {
    transform: translateY(calc(-50% + 6px));
}
.menu-toggle.open span:first-child {
    transform: translateY(-50%) rotate(45deg);
}
.menu-toggle.open span:last-child {
    transform: translateY(-50%) rotate(-45deg);
}
.menu-toggle.open {
    background-color: rgba(255,255,255,0.2);
}

/* ===== 菜单 ===== */
.menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 150;
    display: flex;
    visibility: hidden;
    transition: visibility 0s linear 0.3s;
}
.menu.open {
    visibility: visible;
    transition: visibility 0s linear 0s;
}
/* 淡出关闭 */
.menu.fade-out {
    transition: opacity 0.3s ease, visibility 0s linear 0.3s;
    opacity: 0;
    visibility: visible;
}
/* 左侧 */
.menu-left {
    width: 40%;
    height: 100%;
    background-color: var(--menu-left-bg);
    position: relative;
    transform: translateX(-100%);
    transition: transform 0.4s ease;
    overflow: hidden;
}
.menu.open .menu-left {
    transform: translateX(0);
}
.menu-left img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease;
}
.menu-left .menu-bg-image {
    opacity: 1;
    z-index: 1;
}
.menu-left .menu-hover-image {
    opacity: 0;
    z-index: 2;
}
.menu-left.show-hover .menu-hover-image {
    opacity: 1;
}
/* 右侧 */
.menu-right {
    width: 60%;
    height: 100%;
    background-color: var(--menu-right-bg);
    transform: translateX(100%);
    transition: transform 0.4s ease;
    padding: 160px 2rem 2rem 2rem;
    display: flex;
    flex-direction: column;
    color: var(--text-color);
    overflow-y: auto;
}
.menu.open .menu-right {
    transform: translateX(0);
}
.menu-right {
    font-size: 1.5rem;
}
/* 站点标识 */
.site-name {
    margin-bottom: 1.5em;
}
.site-title {
    font-size: 1.8em;
    font-weight: 600;
    letter-spacing: 1px;
    transition: color 0.5s ease;
}
.site-subtitle {
    font-size: 0.7em;
    font-weight: 300;
    margin-top: 0.3em;
    opacity: 0.8;
    transition: color 0.5s ease;
}
/* 功能按钮 */
.files {
    margin-bottom: 0.5em;
}
.file-buttons {
    display: flex;
    gap: 1em;
    flex-wrap: wrap;
}
.regions {
    margin: 0.5em 0;
}
.region-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5em;
    align-items: flex-start;
}
.pill-button {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    padding: 0.5em 1.2em;
    background-color: var(--pill-bg);
    border-radius: 50px;
    color: var(--link-color);
    text-decoration: none;
    transition: background-color 0.2s, transform 0.1s ease;
    font-size: 1em;
}
.pill-button:hover {
    background-color: var(--pill-hover);
}
.pill-button:active {
    transform: scale(0.96);
}
.pill-button i {
    font-size: 1em;
}
/* 主题与语言切换 */
.theme-toggle,
.lang-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.5em;
    padding: 0.5em 1.2em;
    background-color: var(--pill-bg);
    border-radius: 50px;
    color: var(--link-color);
    transition: background-color 0.2s;
    font-size: 1em;
    cursor: pointer;
    width: fit-content;
}
.theme-toggle:hover,
.lang-trigger:hover {
    background-color: var(--pill-hover);
}
.functions {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5em;
}
/* 语言菜单 */
.language-selector {
    position: relative;
}
.lang-trigger i {
    transition: transform 0.2s;
}
.lang-dropdown {
    position: absolute;
    bottom: 100%;
    left: 0;
    background-color: var(--lang-dropdown-bg);
    border: 1px solid var(--divider-color);
    border-radius: 6px;
    padding: 0.5em 0;
    min-width: 120px;
    opacity: 0;
    transform: scaleY(0);
    transform-origin: bottom;
    transition: transform 0.2s ease, opacity 0.2s ease;
    pointer-events: none;
    z-index: 10;
    font-size: 1rem;
}
.lang-dropdown.open {
    opacity: 1;
    transform: scaleY(1);
    pointer-events: auto;
}
.lang-item {
    display: block;
    padding: 0.5em 1rem;
    color: var(--link-color);
    text-decoration: none;
    transition: background-color 0.2s;
}
.lang-item:hover {
    background-color: var(--pill-hover);
}
/* 分割线 */
.menu-divider {
    border: none;
    border-top: 1px solid var(--divider-color);
    margin: 0.5em 0;
}
.site-info {
    font-size: 0.9em;
    margin: 0.5em 0;
}
.info-item {
    margin: 0.2em 0;
}
.text-link {
    color: var(--link-color);
    text-decoration: none;
}
.text-link:hover {
    text-decoration: underline;
}
.thin-font {
    font-weight: 300;
}

/* ========== #home ========== */
.home-bg,
.home-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}
.home-bg {
    background: url('/index/main/home/bg.png') no-repeat center center/cover;
}
.home-overlay {
    background: linear-gradient(90deg, rgba(1, 120, 58, 0.6), rgba(0, 155, 184, 0.6));
}
.home-section {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    overflow: hidden;
}
.home-container {
    width: 60%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    min-height: 100vh;
    position: relative;
    padding: 2rem 0;
}
.home-content {
    width: 100%;
    text-align: left;
}

/* 动画定义 */
@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}
@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-60px); }
    to   { opacity: 1; transform: translateX(0); }
}
@keyframes slideInDown {
    from { opacity: 0; transform: translateY(-40px); }
    to   { opacity: 1; transform: translateY(0); }
}
@keyframes slideInUp {
    from { opacity: 0; transform: translateX(-50%) translateY(40px); }
    to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
@keyframes bouncePulse {
    0% { transform: translateX(-50%) translateY(0); text-shadow: 0 0 0 rgba(255,255,255,0); }
    50% { transform: translateX(-50%) translateY(12px); text-shadow: 0 0 12px rgba(255,255,255,0.8); }
    100% { transform: translateX(-50%) translateY(0); text-shadow: 0 0 0 rgba(255,255,255,0); }
}

/* 初始隐藏所有动画元素 */
.home-welcome,
.home-title,
.home-subtitle,
.home-note,
.home-button,
.home-arrow {
    opacity: 0;
}

/* 顺序动画 */
.home-section.animate .home-welcome {
    animation: fadeIn 0.6s ease 0.3s forwards;
}
.home-section.animate .home-title {
    animation: slideInLeft 0.6s ease 0.9s forwards;
}
.home-section.animate .home-subtitle {
    animation: slideInDown 0.6s ease 1.5s forwards;
}
.home-section.animate .home-note {
    animation: slideInDown 0.6s ease 1.5s forwards;
}
.home-section.animate .home-button {
    animation: fadeIn 0.6s ease 2.1s forwards;
}
.home-section.animate .home-arrow {
    animation: slideInUp 0.6s ease 1.8s forwards, bouncePulse 1.5s infinite ease 2.4s;
}

/* 文字样式 */
.home-welcome {
    font-size: 1.8rem;
    font-weight: normal;
    margin-bottom: 0.5rem;
    letter-spacing: 2px;
    color: white;
}
.home-title {
    font-size: 4rem;
    font-weight: bold;
    margin: 0.5rem 0;
    background: linear-gradient(135deg, #fff, #a0f0ff);
    background-clip: text;
    -webkit-background-clip: text;
    color: transparent;
    letter-spacing: 2px;
}
.home-subtitle {
    font-size: 1.6rem;
    font-weight: normal;
    margin: 0.5rem 0 0.2rem 0;
    color: white;
    letter-spacing: 1px;
}
.home-note {
    font-size: 1rem;
    font-weight: 300;
    margin-top: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.5;
}
.home-button {
    margin-top: 2rem;
    display: inline-block;
    background-color: var(--pill-bg);
    border-radius: 50px;
    padding: 0.6rem 1.8rem;
    font-size: 1rem;
    cursor: pointer;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border: 1px solid transparent;
}
.home-button:hover {
    background-color: var(--button-hover-bg);
    transform: scale(1.03);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    border-color: rgba(255,255,255,0.3);
    letter-spacing: 0.5px;
}
.home-button:active {
    transform: scale(0.97);
    transition: transform 0.05s;
}
/* 箭头 */
.home-arrow {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: white;
    cursor: pointer;
    transition: transform 0.3s;
    z-index: 2;
}
.home-arrow:hover {
    transform: translateX(-50%) translateY(6px);
}

/* 全屏黑色渐变层（文件跳转换场） */
.black-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: black;
    opacity: 0;
    pointer-events: none;
    z-index: 10000;
    transition: opacity 0.6s cubic-bezier(0.2, 0.9, 0.4, 1.1);
}
.black-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* 响应式适配 */
@media (max-width: 768px) {
    .home-container {
        width: 85%;
    }
    .home-title {
        font-size: 2.8rem;
    }
    .home-welcome {
        font-size: 1.4rem;
    }
    .home-subtitle {
        font-size: 1.2rem;
    }
    .home-note {
        font-size: 0.9rem;
    }
    .home-arrow {
        font-size: 1.6rem;
        bottom: 20px;
    }
    @keyframes bouncePulse {
        0%, 100% { transform: translateX(-50%) translateY(0); text-shadow: none; }
        50% { transform: translateX(-50%) translateY(8px); text-shadow: 0 0 8px rgba(255,255,255,0.6); }
    }
}