/* ============ 顶栏（fixed，滚动加深，模板风格） ============ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    padding-top: 24px;
    padding-bottom: 24px;
    transition: all 300ms var(--ease);
}

.navbar.scrolled {
    padding-top: 14px;
    padding-bottom: 14px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-faint);
}

.navbar-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--margin-mobile);
    padding-right: var(--margin-mobile);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

@media (min-width: 768px) {
    .navbar-inner {
        padding-left: var(--margin-desktop);
        padding-right: var(--margin-desktop);
    }
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: 32px;
}

.brand {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

/* 品牌前的 Logo 图标：无边框/背景/内边距，与文字对齐（32px） */
.brand-mark {
    display: inline-flex;
    align-items: center;
    line-height: 0;
}

.brand-mark img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

/* 品牌后的版本徽标（DeepSeek Harness 式：渐变描边 + 内层深色玻璃胶囊，renderers.heroBadge 填充） */
.brand-version {
    display: inline-flex;
    align-items: center;
    padding: 1px;
    border-radius: 8px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.75) 0%, rgba(255, 255, 255, 0.08) 35%, rgba(255, 255, 255, 0.04) 65%, rgba(255, 255, 255, 0.5) 100%);
    box-shadow: 0 0 16px rgba(255, 255, 255, 0.08), 0 0 32px rgba(255, 255, 255, 0.04);
    margin-left: 2px;
}

.brand-version-inner {
    display: inline-block;
    padding: 4px 9px 3px;
    border-radius: 7px;
    background: rgba(0, 0, 0, 0.25);
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 500;
    line-height: 1;
    color: rgba(255, 255, 255, 0.95);
    white-space: nowrap;
}

.nav-links {
    display: none;
    align-items: center;
    gap: 32px;
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
    }
}

.nav-links a {
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--text);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 导航图标按钮（爱发电等外链图标） */
.nav-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-icon:hover {
    border-color: var(--border-strong);
    background: rgba(255, 255, 255, 0.1);
}

.nav-icon img {
    width: 18px;
    height: 18px;
}

/* 语言切换（deepseek 式分段按钮：中文/EN 同显，当前语言高亮） */
.lang-toggle {
    display: flex;
    align-items: center;
    height: 32px;
    padding: 3px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.03);
}

.lang-toggle-item {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 0 12px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s, background-color 0.2s, box-shadow 0.2s;
}

.lang-toggle-item:hover {
    color: var(--text);
}

.lang-toggle-item.is-active {
    background: var(--surface-container);
    color: var(--text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

/* 移动端菜单按钮（DeepSeek Harness 式汉堡，仅窄屏显示，见 responsive.css） */
.nav-menu-btn {
    display: none;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
    color: var(--text);
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-menu-btn:hover {
    border-color: var(--border-strong);
    background: rgba(255, 255, 255, 0.1);
}

/* 三横线图标：点击展开时动画变为 ×（上下线旋转、中线隐去） */
.menu-icon {
    position: relative;
    display: block;
    width: 20px;
    height: 20px;
}

.menu-bar {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 16px;
    height: 1.6px;
    border-radius: 2px;
    background: currentColor;
    transform: translate(-50%, -50%);
    transition: transform 300ms var(--ease), opacity 200ms var(--ease);
}

.menu-bar:nth-child(1) {
    transform: translate(-50%, calc(-50% - 5px));
}

.menu-bar:nth-child(3) {
    transform: translate(-50%, calc(-50% + 5px));
}

.nav-menu-btn.is-active .menu-bar:nth-child(1) {
    transform: translate(-50%, -50%) rotate(45deg);
}

.nav-menu-btn.is-active .menu-bar:nth-child(2) {
    opacity: 0;
}

.nav-menu-btn.is-active .menu-bar:nth-child(3) {
    transform: translate(-50%, -50%) rotate(-45deg);
}

/* 移动端菜单：全屏黑底（DeepSeek Harness 官网式）。位于 body 层（z-index 低于导航栏，
   使 logo 与 × 按钮浮在菜单之上），避免被 .navbar.scrolled 的 backdrop-filter 锚定。 */
.mobile-menu {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 45;
    padding: 0 var(--margin-mobile);
    background: #000000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    overflow-y: auto;
    transition: opacity 220ms var(--ease), visibility 0s 220ms;
}

.mobile-menu.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 220ms var(--ease);
}

.mobile-menu-inner {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    padding-top: 116px; /* 避开顶部导航栏（含未滚动时的留白） */
}

.mobile-menu-links {
    flex: 1;
}

/* 大字号菜单项 + 分隔线（参考 DeepSeek Harness 官网移动菜单） */
.mobile-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 26px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    font-size: 24px;
    font-weight: 500;
    letter-spacing: -0.01em;
    color: var(--text);
    opacity: 0;
    transform: translateY(16px);
    transition: color var(--transition-fast), opacity 140ms var(--ease), transform 140ms var(--ease);
}

.mobile-menu-item:hover,
.mobile-menu-item:active {
    color: var(--primary);
}

.mobile-menu.is-open .mobile-menu-item {
    opacity: 1;
    transform: translateY(0);
    transition: color var(--transition-fast), opacity 320ms var(--ease), transform 320ms var(--ease);
}

.mobile-menu.is-open .mobile-menu-item:nth-child(1) {
    transition-delay: 60ms;
}

.mobile-menu.is-open .mobile-menu-item:nth-child(2) {
    transition-delay: 110ms;
}

/* 底部语言切换（参考站：语言分段按钮固定在菜单底部） */
.mobile-menu-footer {
    padding: 24px 0 36px;
}

/* 注意：.lang-toggle 是块级 flex 容器，默认占满整行——需限定为内容宽度，
   否则外边框会被拉成长条（桌面导航栏中它是 flex 子项，不受影响）。 */
.mobile-menu .lang-toggle {
    width: fit-content;
    max-width: fit-content;
    height: 38px;
    padding: 4px;
}

.mobile-menu .lang-toggle-item {
    padding: 0 16px;
    font-size: 13px;
}

/* 全屏菜单（或确认弹窗）打开时隐藏回到顶部按钮 */
body.no-scroll .to-top {
    opacity: 0;
    pointer-events: none;
}

/* 阅读进度条（js/modules/effects.js 控制宽度） */
.scroll-progress {
    position: absolute;
    left: 0;
    bottom: -1px;
    height: 2px;
    width: 0;
    background: linear-gradient(90deg, var(--primary-container), var(--primary));
    pointer-events: none;
}

/* ============ 主内容 ============ */

.main {
    flex-grow: 1;
    position: relative;
    z-index: 10;
    padding-top: 160px;
    padding-bottom: 128px;
}

/* 区块：全宽发丝分隔 + 大留白 */
.section {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--margin-mobile);
    padding-right: var(--margin-mobile);
    padding-top: 64px;
    padding-bottom: 64px;
}

@media (min-width: 768px) {
    .section {
        padding-left: var(--margin-desktop);
        padding-right: var(--margin-desktop);
        padding-top: 128px;
        padding-bottom: 128px;
    }
}

.content-section {
    border-top: 1px solid var(--border-faint);
}

/* ============ 页脚 ============ */

.footer {
    border-top: 1px solid var(--border-faint);
    padding-top: 48px;
    padding-bottom: 48px;
}

.footer-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding-left: var(--margin-desktop);
    padding-right: var(--margin-desktop);
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}

@media (min-width: 768px) {
    .footer-inner {
        grid-template-columns: 1.4fr 1fr 1fr;
        gap: 48px;
    }
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 700;
    display: block;
}

.footer-brand p {
    margin-top: 12px;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 300;
    max-width: 360px;
    line-height: 1.7;
}

.footer-copy {
    margin-top: 16px !important;
    color: var(--text-faint) !important;
    font-family: var(--font-mono);
    font-size: 12px !important;
}

/* 页脚邮件订阅表单（紧凑：紧跟 footerDesc，单行输入框 + 按钮） */
.newsletter-form {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    max-width: 300px;
}

.newsletter-input {
    flex: 1;
    min-width: 0;
    box-sizing: border-box;
    width: 100%;
    height: 38px;
    padding: 0 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-subtle);
    background: var(--surface-low);
    color: var(--text);
    font-size: 14px;
    font-family: var(--font-body);
    transition: border-color var(--transition-fast);
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--primary-container);
}

.newsletter-input::placeholder {
    color: var(--text-faint);
}

.newsletter-btn {
    flex-shrink: 0;
    height: 38px;
    padding: 0 18px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.16);
    background: #fff;
    color: #111;
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    transition: opacity var(--transition-fast), background var(--transition-fast);
}

.newsletter-btn:hover:not(:disabled) {
    background: #ececec;
    opacity: 1;
}

.newsletter-btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.newsletter-msg {
    margin-top: 8px !important;
    font-size: 12px !important;
}

.newsletter-msg.is-ok {
    color: #4ade80 !important;
}

.newsletter-msg.is-err {
    color: #f87171 !important;
}

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

.footer-col h5 {
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 4px;
}

.footer-col a {
    color: var(--text-muted);
    font-size: 14px;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--text);
}