/* 支持哪些 AI：卡片品牌 logo（替代 emoji） */
#supported-ai .ai-model-card__logo {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
}

#supported-ai .ai-model-card__logo img {
    height: 40px;
    width: auto;
    max-width: min(100%, 140px);
    object-fit: contain;
    display: block;
}

#supported-ai .ai-model-card__logo--more svg {
    width: 36px;
    height: 36px;
    display: block;
    opacity: 0.88;
}

@media (max-width: 1200px) {
    #supported-ai .ai-models-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
    }
}

@media (max-width: 860px) {
    #supported-ai .ai-models-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr)) !important;
        gap: 8px !important;
        margin-top: 20px !important;
    }

    #supported-ai .ai-model-card {
        padding: 10px 6px !important;
        border-radius: 8px !important;
    }

    #supported-ai .ai-model-card__logo {
        min-height: 28px;
        margin-bottom: 6px;
    }

    #supported-ai .ai-model-card__logo img {
        height: 24px;
        max-width: min(100%, 64px);
    }

    #supported-ai .ai-model-card h3 {
        font-size: 12px !important;
        margin-bottom: 0 !important;
        line-height: 1.25;
    }

    #supported-ai .ai-model-card p {
        display: none;
    }
}

/* 安全信任区：浅色冷科技，与 Hero / 视频区同系（非深空底） */
.trust-cosmos {
    position: relative;
    overflow: hidden;
    color: var(--text-color);
    padding: clamp(56px, 8vw, 96px) 0 clamp(64px, 9vw, 104px);
    border-top: none;
}

.trust-cosmos__bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: transparent;
}

.trust-cosmos__inner {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 920px;
    margin: 0 auto;
    padding: 0 clamp(16px, 3vw, 28px);
}

.trust-cosmos__title {
    margin: 0;
    font-size: clamp(1.65rem, 3.6vw, 2.35rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    color: #0f172a;
    text-shadow: none;
}

.trust-cosmos__lead {
    margin: clamp(18px, 3vw, 26px) auto 0;
    max-width: 46rem;
    font-size: clamp(14px, 1.25vw, 16px);
    line-height: 1.75;
    color: #475569;
}

.trust-cosmos__grid {
    list-style: none;
    margin: clamp(36px, 6vw, 56px) auto 0;
    padding: 0;
    max-width: 1040px;
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(18px, 3.5vw, 36px);
}

.trust-pillar {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    text-align: center;
}

.trust-pillar__icon {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(148, 163, 184, 0.28);
    box-shadow: 0 4px 16px rgba(60, 64, 67, 0.06);
    color: #5f6368;
}

.trust-pillar__icon svg {
    width: 30px;
    height: 30px;
    display: block;
}

.trust-pillar__label {
    font-size: clamp(13px, 1.15vw, 15px);
    font-weight: 600;
    line-height: 1.45;
    color: #0f172a;
}

.trust-pillar__sub {
    display: block;
    margin-top: 4px;
    font-size: clamp(11px, 1vw, 13px);
    font-weight: 500;
    line-height: 1.45;
    color: #64748b;
}

.trust-pillar__line {
    display: block;
    font-size: clamp(13px, 1.15vw, 15px);
    font-weight: 600;
    line-height: 1.45;
    color: #0f172a;
}

.trust-pillar__line + .trust-pillar__line {
    margin-top: 2px;
}

.trust-pillar__link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid rgba(var(--primary-rgb), 0.35);
    padding-bottom: 1px;
    transition: color 0.2s ease, border-color 0.2s ease;
}

.trust-pillar__link:hover {
    color: var(--secondary-color);
    border-bottom-color: rgba(25, 103, 210, 0.45);
}

@media (max-width: 900px) {
    .trust-cosmos__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 992px) {
    .trust-cosmos {
        display: none;
    }

    .use-cases-section {
        display: none;
    }

    .features-section {
        display: none;
    }
}

@media (max-width: 520px) {
    .trust-cosmos__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px 10px;
        margin-top: 28px;
    }

    .trust-pillar {
        gap: 8px;
    }

    .trust-pillar__icon {
        width: 56px;
        height: 56px;
    }

    .trust-pillar__icon svg {
        width: 24px;
        height: 24px;
    }

    .trust-pillar__label,
    .trust-pillar__line {
        font-size: 12px;
        line-height: 1.35;
    }

    .trust-pillar__sub {
        margin-top: 2px;
        font-size: 10px;
        line-height: 1.35;
    }
}

.browser-content {
    padding: 20px;
    background: var(--page-bg);
}

/* 视频区：默认占位；桌面由封面图撑高；≤992px 见下方移动端规则 */
.browser-content.hero-landing-wrap {
    padding: 0;
    overflow: hidden;
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    min-height: 0;
    max-height: min(56vh, 560px);
    background: #f5f7fa;
    display: flex;
    align-items: center;
    justify-content: center;
    --hero-img-contrast: 1.03;
    --hero-img-saturate: 1.04;
    --hero-img-brightness: 1.01;
    isolation: isolate;
}

@media (min-width: 993px) {
    .browser-content.hero-landing-wrap {
        display: block;
        aspect-ratio: unset;
        max-height: none;
        height: auto;
        line-height: 0;
        background: #ffffff;
    }
}

.hero-landing-img,
.hero-landing-video {
    display: block;
    width: 100%;
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    object-position: center center;
    filter: contrast(var(--hero-img-contrast)) saturate(var(--hero-img-saturate)) brightness(var(--hero-img-brightness));
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}

.hero-landing-video {
    background: #ffffff;
    cursor: default;
}

/* 首屏先展示静态图，视频可播放后再叠化切换（避免首帧空白） */
.hero-landing-wrap .hero-landing-poster {
    transition: opacity 0.45s ease;
}

/* 封面 src 尚未注入时的占位，避免布局塌缩 */
.hero-landing-poster:not([src]) {
    min-height: clamp(160px, 42vw, 300px);
    background: linear-gradient(160deg, #e8ecf2 0%, #f4f6f9 100%);
}

.hero-landing-wrap .hero-landing-video {
    transition: opacity 0.45s ease;
}

/* 移动端：封面在文档流撑高度，视频绝对叠放，避免双 absolute 导致白屏 */
@media (max-width: 992px) {
    .browser-content.hero-landing-wrap {
        display: block;
        position: relative;
        width: 100%;
        max-height: none;
        aspect-ratio: unset;
        overflow: hidden;
        line-height: 0;
        background: #ffffff;
    }

    .hero-landing-wrap .hero-landing-poster {
        position: relative;
        z-index: 1;
        display: block;
        width: 100%;
        height: auto;
        max-height: min(70vh, 520px);
        object-fit: contain;
    }

    .hero-landing-wrap .hero-landing-video {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        object-fit: contain;
        opacity: 0;
        z-index: 2;
        max-height: none;
    }

    .hero-landing-wrap.hero-landing-wrap--video-ready .hero-landing-video {
        opacity: 1;
    }

    .hero-landing-wrap.hero-landing-wrap--video-ready .hero-landing-poster {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }
}

@media (min-width: 993px) {
    .hero-landing-wrap .hero-landing-poster {
        position: relative;
        z-index: 1;
        width: 100%;
        height: auto;
        max-height: none;
    }

    .hero-landing-wrap .hero-landing-video {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        object-fit: contain;
        opacity: 0;
        z-index: 2;
        max-height: none;
    }

    .hero-landing-wrap.hero-landing-wrap--video-ready .hero-landing-video {
        opacity: 1;
    }

    .hero-landing-wrap.hero-landing-wrap--video-ready .hero-landing-poster {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }
}

/* 未播放时：正中播放按钮（叠在封面/视频上，低于底部控制条） */
.hero-landing-center-play {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 3;
    width: clamp(72px, 14vw, 96px);
    height: clamp(72px, 14vw, 96px);
    border: none;
    border-radius: 50%;
    padding: 0;
    margin: 0;
    cursor: pointer;
    background: transparent;
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
    transition: opacity 0.25s ease, transform 0.2s ease, visibility 0.25s ease;
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
}

.hero-landing-center-play__bg {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: rgba(15, 23, 42, 0.48);
    box-shadow: 0 10px 36px rgba(15, 23, 42, 0.38);
    border: 2px solid rgba(255, 255, 255, 0.9);
    transition: background 0.2s ease, transform 0.2s ease;
}

.hero-landing-center-play:hover .hero-landing-center-play__bg,
.hero-landing-center-play:focus-visible .hero-landing-center-play__bg {
    background: rgba(15, 23, 42, 0.58);
    transform: scale(1.06);
}

.hero-landing-center-play:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 4px;
}

.hero-landing-center-play__icon {
    position: relative;
    z-index: 1;
    font-size: clamp(28px, 5vw, 40px);
    line-height: 1;
    margin-left: 0.14em;
    text-shadow: 0 2px 14px rgba(0, 0, 0, 0.4);
}

.hero-landing-wrap--playing .hero-landing-center-play {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.hero-landing-wrap:not(.hero-landing-wrap--playing) .hero-landing-poster,
.hero-landing-wrap:not(.hero-landing-wrap--playing) .hero-landing-video {
    cursor: pointer;
}

/* 用户点击播放后、媒体尚未可播时的加载态 */
.hero-landing-loading {
    position: absolute;
    inset: 0;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
    cursor: wait;
    background: rgba(248, 250, 252, 0.72);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.hero-landing-loading[hidden] {
    display: none !important;
}

.hero-landing-loading__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(var(--primary-rgb), 0.14);
    box-shadow: 0 12px 36px rgba(15, 23, 42, 0.12);
    color: #0f172a;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: -0.02em;
    font-family: inherit;
}

.hero-landing-loading__spinner {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 3px solid rgba(var(--primary-rgb), 0.2);
    border-top-color: var(--primary-color);
    animation: hero-landing-loading-spin 0.75s linear infinite;
}

@keyframes hero-landing-loading-spin {
    to {
        transform: rotate(360deg);
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero-landing-loading__spinner {
        animation: none;
        border-top-color: rgba(var(--primary-rgb), 0.35);
        opacity: 0.85;
    }
}

/* 首屏视频：底部播放控制条（叠在封面/视频之上） */
.hero-landing-chrome {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 5;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 12px 12px 12px;
    pointer-events: none;
    background: linear-gradient(180deg, transparent 0%, rgba(15, 23, 42, 0.18) 42%, rgba(15, 23, 42, 0.78) 100%);
}

.hero-landing-chrome__bar {
    pointer-events: auto;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.hero-landing-chrome__play {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    border-radius: 11px;
    border: 1px solid rgba(255, 255, 255, 0.45);
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    font-size: 15px;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.12);
    transition: background-color 0.15s ease, transform 0.15s ease;
    font-family: inherit;
}

.hero-landing-chrome__play:hover {
    background: #ffffff;
    transform: translateY(-1px);
}

.hero-landing-chrome__play:focus-visible {
    outline: 2px solid rgba(var(--primary-rgb), 0.45);
    outline-offset: 2px;
}

.hero-landing-chrome__play-icon {
    display: block;
    transform: translateX(1px);
    font-size: 15px;
    line-height: 1;
}

.hero-landing-wrap--playing .hero-landing-chrome__play-icon {
    transform: translateX(0);
    font-size: 14px;
}

.hero-landing-chrome__progress {
    flex: 1 1 auto;
    min-width: 0;
    padding: 6px 0;
    cursor: pointer;
}

.hero-landing-chrome__track {
    height: 7px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.38);
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.12);
}

.hero-landing-chrome__fill {
    height: 100%;
    width: 0%;
    border-radius: inherit;
    background: linear-gradient(90deg, #93c5fd 0%, var(--primary-color) 100%);
    box-shadow: 0 0 10px rgba(var(--primary-rgb), 0.25);
    transition: width 0.08s linear;
}

.hero-landing-chrome__time {
    flex-shrink: 0;
    font-size: 11px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.02em;
    color: rgba(255, 255, 255, 0.92);
    text-shadow: 0 1px 2px rgba(15, 23, 42, 0.45);
    min-width: 7.5em;
    text-align: right;
}

.hero-landing-chrome__volume-wrap {
    position: relative;
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.hero-landing-chrome__volume {
    width: 38px;
    height: 38px;
    border-radius: 11px;
    border: 1px solid rgba(255, 255, 255, 0.45);
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0;
    box-shadow: 0 2px 10px rgba(15, 23, 42, 0.12);
    transition: background-color 0.15s ease, transform 0.15s ease;
    font-family: inherit;
    -webkit-tap-highlight-color: transparent;
}

.hero-landing-chrome__volume:hover {
    background: #ffffff;
    transform: translateY(-1px);
}

.hero-landing-chrome__volume:focus-visible {
    outline: 2px solid rgba(var(--primary-rgb), 0.45);
    outline-offset: 2px;
}

.hero-landing-chrome__volume-svg {
    display: block;
}

.hero-landing-chrome__volume-tip {
    position: absolute;
    right: 0;
    bottom: calc(100% + 8px);
    max-width: min(240px, 70vw);
    padding: 8px 10px;
    border-radius: 10px;
    font-size: 12px;
    font-weight: 600;
    line-height: 1.35;
    color: rgba(255, 255, 255, 0.96);
    background: rgba(15, 23, 42, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.14);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
    white-space: normal;
    pointer-events: none;
    opacity: 0;
    transform: translateY(4px);
    transition: opacity 0.18s ease, transform 0.18s ease;
    z-index: 6;
}

.hero-landing-chrome__volume-tip.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 992px) {
    .hero-landing-chrome {
        padding: 12px 10px 10px;
        gap: 8px;
    }

    .hero-landing-chrome__time {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .hero-landing-chrome__fill,
    .hero-landing-chrome__play,
    .hero-landing-chrome__volume,
    .hero-landing-chrome__volume-tip,
    .hero-landing-center-play,
    .hero-landing-center-play__bg {
        transition: none;
    }

    .hero-landing-wrap .hero-landing-poster,
    .hero-landing-wrap .hero-landing-video {
        transition: none;
    }
}

@media (prefers-contrast: more) {
    .browser-content.hero-landing-wrap {
        --hero-img-contrast: 1.16;
        --hero-img-saturate: 1.08;
        --hero-img-brightness: 1.035;
    }
}

.chat-interface {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.chat-tabs {
    display: flex;
    background: var(--page-bg);
    border-bottom: 1px solid #e2e8f0;
}

.tab {
    padding: 12px 20px;
    font-size: 13px;
    color: #64748b;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--surface-cool);
}

.chat-input-area {
    padding: 16px;
    display: flex;
    gap: 12px;
    align-items: center;
}

.input-box {
    flex: 1;
    background: var(--surface-cool);
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    color: #334155;
    display: flex;
    align-items: center;
}

.cursor {
    animation: blink 1s infinite;
    color: var(--primary-color);
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.send-btn {
    background: var(--primary-color);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
}

.chat-responses {
    padding: 0 16px 16px;
}

.response-item {
    display: flex;
    gap: 12px;
    margin-bottom: 12px;
    align-items: flex-start;
}

.response-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.response-content {
    background: var(--surface-cool);
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 13px;
    color: #475569;
    flex: 1;
}

@media (min-width: 993px) and (max-width: 1200px) {
    .hero-content {
        grid-template-columns: minmax(0, 36%) minmax(0, 44%);
        justify-content: center;
        column-gap: clamp(28px, 4vw, 52px);
        padding-left: clamp(12px, 1.5vw, 24px);
        padding-right: clamp(40px, 6vw, 96px);
    }
}

/* 移动端：口号→商店/下载；演示视频在 Hero 下方独立区块（flex 单栏；重置桌面网格定位避免串版） */


/* 联系区域：深蓝 CTA 底上的按钮白底深色字；底部安装为主行动，加大层次 */
.contact-section .btn-primary {
    background-color: #ffffff;
    color: #0f172a;
    border: 1px solid rgba(255, 255, 255, 0.96);
}

.contact-section .btn-primary:hover {
    background-color: #f8fafc;
    color: #020617;
    transform: translateY(-2px);
}

.contact-section .download-dropdown .btn-primary {
    background-color: #ffffff;
    color: #0f172a;
    font-weight: 700;
    font-size: clamp(16px, 2.5vw, 18px);
    padding: 16px 40px;
    border-radius: 14px;
    border: 1px solid rgba(15, 23, 42, 0.08);
    box-shadow:
        0 14px 44px rgba(15, 23, 42, 0.42),
        0 2px 10px rgba(15, 23, 42, 0.18),
        0 0 0 1px rgba(255, 255, 255, 0.55);
}

.contact-section .download-dropdown .btn-primary:hover {
    background-color: #ffffff;
    color: #020617;
    transform: translateY(-3px);
    box-shadow:
        0 18px 52px rgba(15, 23, 42, 0.48),
        0 4px 14px rgba(15, 23, 42, 0.22),
        0 0 0 1px rgba(255, 255, 255, 0.7);
}

.contact-section .btn-primary:focus-visible,
.contact-section .download-dropdown .btn-primary:focus-visible {
    outline: 3px solid rgba(255, 255, 255, 0.98);
    outline-offset: 3px;
}

/* 语言切换按钮（页脚等浅色区仍用默认描边样式） */
.lang-toggle {
    padding: 8px 16px;
    border: 2px solid var(--primary-color);
    background-color: transparent;
    color: var(--primary-color);
    border-radius: 5px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

.lang-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 免费标签 */
.free-badge {
    display: inline-block;
    background-color: var(--success);
    color: var(--white);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 14px;
    margin-bottom: 20px;
}

/* 核心价值区域 */
.core-value-section {
    padding: 100px 0;
    background: transparent;
}

.core-value-content {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}

.core-value-text {
    flex: 1;
    min-width: 300px;
}

.core-value-text h2 {
    font-size: 36px;
    margin-bottom: 30px;
    color: var(--text-color);
    line-height: 1.3;
}

.core-value-text p {
    font-size: 18px;
    color: var(--light-text);
    margin-bottom: 20px;
    line-height: 1.8;
}

.core-value-highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 30px;
    border-radius: 10px;
    margin-top: 30px;
}

.core-value-highlight h3 {
    font-size: 20px;
    margin-bottom: 15px;
}

.core-value-highlight ul {
    list-style: none;
}

.core-value-highlight li {
    margin-bottom: 10px;
    padding-left: 25px;
    position: relative;
}

.core-value-highlight li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

.core-value-image {
    flex: 1;
    min-width: 300px;
}

.core-value-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 36px;
    margin-bottom: 20px;
    color: var(--text-color);
}

.section-title p {
    font-size: 18px;
    color: var(--light-text);
    max-width: 700px;
    margin: 0 auto;
}

/* 功能特点 */
.features-section {
    padding: 100px 0;
    background: transparent;
}

.feature-item {
    display: flex;
    align-items: center;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.feature-item:nth-child(even) {
    flex-direction: row-reverse;
}

.feature-image {
    flex: 1;
    min-width: 300px;
    margin: 20px;
}

.feature-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-content {
    flex: 1;
    min-width: 300px;
    margin: 20px;
}

.feature-content h3 {
    font-size: 28px;
    margin-bottom: 20px;
    color: var(--text-color);
}

.feature-content p {
    font-size: 16px;
    color: var(--light-text);
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    margin-bottom: 10px;
    padding-left: 30px;
    position: relative;
    color: var(--light-text);
}

.feature-list li:before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

/* 使用场景 */
.use-cases-section {
    padding: 100px 0;
    background: transparent;
}

.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.use-case-card {
    background-color: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.use-case-icon {
    width: 80px;
    height: 80px;
    background-color: var(--accent-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
    color: var(--white);
}

.use-case-card h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: var(--text-color);
}

.use-case-card p {
    color: var(--light-text);
}

/* 用户评价 */
.testimonials-section {
    padding: 100px 0;
    background: transparent;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background-color: var(--background-color);
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.testimonial-content {
    margin-bottom: 30px;
    font-style: italic;
    color: var(--light-text);
}

.testimonial-author {
    display: flex;
    align-items: center;
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 15px;
    background-color: var(--light-gray);
}

.author-info h4 {
    color: var(--text-color);
    margin-bottom: 5px;
}

.author-info p {
    color: var(--light-text);
    font-size: 14px;
}

/* 常见问题 */
.faq-section {
    padding: 100px 0;
    background: transparent;
}

/* SEO 长内容区块：与主流程共用 body 铺底，不另起底色 */
.seo-section {
    padding: 80px 0;
    background: transparent;
}

/* 联系区为深蓝 CTA：自页底色柔和切入 */
.contact-section {
    padding: 100px 0;
    background: linear-gradient(
        180deg,
        var(--page-bg) 0%,
        var(--primary-color) 32%,
        var(--secondary-color) 100%
    );
    color: var(--white);
    text-align: center;
}

/* FAQ 在联系区之后：自 CTA 色柔和回到页底色 */
#faq.seo-section {
    background: linear-gradient(
        180deg,
        rgba(29, 78, 216, 0.1) 0%,
        var(--page-bg) 14%,
        var(--page-bg) 100%
    );
}

.faq-item {
    margin-bottom: 20px;
    border: 1px solid var(--light-gray);
    border-radius: 10px;
    overflow: hidden;
}

.faq-question {
    background-color: var(--white);
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-answer.active {
    max-height: 200px;
    padding: 20px;
}

.faq-toggle {
    transition: transform 0.3s ease;
}

.faq-toggle.active {
    transform: rotate(180deg);
}

#faq .faq-item h3 {
    cursor: pointer;
    margin-bottom: 0 !important;
}

#faq .faq-item p {
    display: none;
    margin-top: 10px;
}

#faq .faq-item.is-open p {
    display: block;
}

.contact-section h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.contact-section p {
    font-size: 18px;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
}

/* 联系区 CTA：白底主按钮，与深蓝渐变背景强对比，避免与底色融在一起 */
.contact-section .bottom-download .btn-primary {
    background: #ffffff;
    color: #1e3a8a;
    border: 2px solid rgba(255, 255, 255, 0.95);
    font-weight: 700;
    font-size: 16px;
    padding: 14px 32px;
    border-radius: 999px;
    box-shadow:
        0 12px 36px rgba(15, 23, 42, 0.32),
        0 0 0 1px rgba(255, 255, 255, 0.5) inset;
}

.contact-section .bottom-download .btn-primary:hover {
    background: #f8fafc;
    color: var(--secondary-color);
    border-color: #ffffff;
    transform: translateY(-2px);
    box-shadow:
        0 16px 44px rgba(15, 23, 42, 0.38),
        0 0 0 1px rgba(255, 255, 255, 0.65) inset;
}

.contact-section .bottom-download .btn-primary:focus-visible {
    outline: 3px solid rgba(255, 255, 255, 0.92);
    outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
    .contact-section .bottom-download .btn-primary:hover {
        transform: none;
    }
}

/* 页脚：自正文底色柔和过渡到浅蓝，避免与 FAQ 硬切 */
footer {
    background: linear-gradient(
        180deg,
        var(--page-bg) 0%,
        var(--footer-bg-top) 26%,
        var(--footer-bg-bottom) 100%
    );
    color: #0f172a;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-column h3 {
    margin-bottom: 20px;
    font-size: 18px;
    color: #0f172a;
}

.footer-column p,
.footer-column li {
    margin-bottom: 10px;
    opacity: 0.92;
    color: #334155;
}

.footer-column ul {
    list-style: none;
}

.footer-column a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.footer-column a:hover {
    color: var(--secondary-color);
    opacity: 1;
}

.footer-bottom {
    border-top: none;
    padding-top: 30px;
    text-align: center;
    color: #64748b;
    opacity: 1;
}

/* 响应式设计：小屏弱化顶栏、抬高首屏 hero 占比 */

/* 下载按钮下拉菜单 */