/* ============================================
   百抖AI官网 · 关于我们页独有样式 about.css
   覆盖：内页头图（蓝青） / 视频模块 / 公司简介+照片 /
         数据亮点带 / 三大业务卡片 / 五步闭环 / 总结框 / 响应式
   ============================================ */

/* ====== Page Hero（蓝青主题） ====== */
.page-hero {
    background:
        radial-gradient(760px 420px at 82% 30%, rgba(56, 189, 248, .38), transparent 60%),
        repeating-radial-gradient(circle at 84% 38%, rgba(125, 211, 252, .12) 0 1px, transparent 1px 46px),
        radial-gradient(560px 380px at 12% 80%, rgba(30, 64, 175, .5), transparent 65%),
        linear-gradient(125deg, #0b1730 0%, #1e3a8a 55%, #3b82f6 100%);
}

/* ====== 公司简介 + 照片（左右结构） ====== */
.intro-grid {
    display: grid;
    grid-template-columns: .92fr 1.08fr;
    gap: 56px;
    align-items: stretch; /* 照片列与文字列等高，视觉更均衡 */
}

/* --- 左侧照片 --- */
.intro-photo {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 0 30px 36px 0; /* 给右下角悬浮徽章留空间 */
}

.photo-frame {
    position: relative;
    flex: 1;
    min-height: 420px; /* 文字较短时保底高度 */
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid rgba(37, 99, 235, .14);
    box-shadow: 0 24px 60px rgba(30, 58, 138, .18);
    background: #0b1730;
}

.photo-frame::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(165deg, rgba(11, 23, 48, 0) 58%, rgba(11, 23, 48, .38) 100%);
    pointer-events: none;
}

.photo-frame img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}

.intro-photo:hover .photo-frame img {
    transform: scale(1.045);
}

/* 左上角地点标签 */
.photo-tag {
    position: absolute;
    top: 18px;
    left: 18px;
    padding: 7px 16px;
    border-radius: 999px;
    background: rgba(11, 23, 48, .55);
    -webkit-backdrop-filter: blur(6px);
    backdrop-filter: blur(6px);
    color: #fff;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .5px;
    z-index: 2;
}

/* 右下角悬浮徽章 */
.photo-badge {
    position: absolute;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 24px;
    border-radius: 16px;
    background: #fff;
    border: 1px solid #e8eefb;
    box-shadow: 0 16px 40px rgba(30, 58, 138, .16);
    z-index: 2;
}

.photo-badge strong {
    font-size: 42px;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(120deg, #1e40af, #2563eb);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.photo-badge strong span {
    font-size: 16px;
    margin-left: 2px;
}

.photo-badge em {
    font-style: normal;
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.55;
}

/* --- 右侧文字 --- */
.intro-text {
    text-align: left;
}

.intro-text .sec-label {
    margin-bottom: 16px;
}

.intro-text h3 {
    font-size: clamp(22px, 2.4vw, 30px);
    font-weight: 800;
    color: var(--gray-900);
    line-height: 1.35;
    margin-bottom: 18px;
}

.intro-text p {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.95;
    margin-bottom: 14px;
}

.intro-text p strong {
    color: var(--blue);
    font-weight: 700;
}

/* 导语段 */
.intro-text p.intro-lead {
    font-size: 17px;
    color: var(--gray-700);
    font-weight: 600;
    line-height: 1.85;
    padding-left: 14px;
    border-left: 3px solid var(--blue);
    margin-bottom: 18px;
}

/* ====== 视频模块（保留，随时可启用） ====== */
.video-wrap {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 24px 64px rgba(30, 58, 138, .22);
    background: linear-gradient(135deg, #0b1730 0%, #1e3a8a 60%, #3b82f6 100%);
    aspect-ratio: 16 / 9;
}

.video-wrap video {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #0b1730;
}

.video-cover {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    cursor: pointer;
    background: radial-gradient(420px 220px at 72% 28%, rgba(125, 211, 252, .28), transparent 60%), radial-gradient(300px 200px at 20% 80%, rgba(59, 130, 246, .35), transparent 65%), linear-gradient(135deg, rgba(11, 23, 48, .55), rgba(30, 58, 138, .35));
    transition: background .3s;
}

.video-cover:hover {
    background: radial-gradient(420px 220px at 72% 28%, rgba(125, 211, 252, .38), transparent 60%), radial-gradient(300px 200px at 20% 80%, rgba(59, 130, 246, .45), transparent 65%), linear-gradient(135deg, rgba(11, 23, 48, .48), rgba(30, 58, 138, .28));
}

.video-cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
    background-size: 48px 48px;
    pointer-events: none;
}

.video-cover:hover .play-btn {
    transform: scale(1.08);
    box-shadow: 0 0 0 14px rgba(255, 255, 255, .12);
}

.play-btn {
    position: relative;
    z-index: 1;
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .95);
    display: grid;
    place-items: center;
    box-shadow: 0 0 0 0 rgba(255, 255, 255, .45);
    transition: transform .25s, box-shadow .25s;
}

.play-btn::before {
    content: "";
    width: 0;
    height: 0;
    margin-left: 6px;
    border-style: solid;
    border-width: 15px 0 15px 26px;
    border-color: transparent transparent transparent var(--blue);
}

.video-cover .play-tip {
    position: relative;
    z-index: 1;
    color: rgba(255, 255, 255, .92);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 2px;
}

/* ====== 数据亮点带 ====== */
.about-stats-band {
    padding: 54px 0;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    position: relative;
}

.stat-item + .stat-item::before {
    content: "";
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 52px;
    background: linear-gradient(180deg, transparent, #c7d7f5, transparent);
}

.stat-num {
    font-size: clamp(34px, 3.4vw, 48px);
    font-weight: 800;
    line-height: 1.15;
    background: linear-gradient(120deg, #1e40af, #2563eb);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-num i {
    font-style: normal;
    font-size: .45em;
    margin-left: 3px;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-500);
    margin-top: 6px;
}

/* ====== 三大业务体系卡片 ====== */
.biz-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
    align-items: stretch;
}

.biz-card {
    position: relative;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    padding: 34px 28px 30px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: all .3s;
    box-shadow: 0 1px 4px rgba(0, 0, 0, .04);
}

.biz-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--blue), #38bdf8);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .35s;
}

.biz-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 18px 44px rgba(37, 99, 235, .12);
    border-color: #c7d2fe;
}

.biz-card:hover::before {
    transform: scaleX(1);
}

.biz-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    font-size: 26px;
    background: linear-gradient(135deg, #eff6ff, #e0f2fe);
    border: 1px solid #dbeafe;
    margin-bottom: 18px;
}

.biz-title {
    font-size: 20px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 6px;
}

.biz-en {
    display: inline-block;
    align-self: flex-start;
    font-size: 12px;
    color: var(--blue);
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 14px;
    padding: 3px 12px;
    border-radius: 999px;
    background: var(--blue-light);
    border: 1px solid #dbeafe;
}

.biz-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.9;
    text-align: justify;
}

/* ====== 五步闭环 ====== */
.step-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 18px;
}

.step-card {
    position: relative;
    background: #fff;
    border: 1px solid var(--gray-200);
    border-radius: 14px;
    padding: 30px 22px 24px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all .3s;
    box-shadow: 0 1px 4px rgba(0, 0, 0, .04);
}

.step-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--blue), #38bdf8);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .35s;
}

.step-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 14px 36px rgba(37, 99, 235, .1);
    border-color: #c7d2fe;
}

.step-card:hover::before {
    transform: scaleX(1);
}

.step-num {
    position: absolute;
    top: 10px;
    right: 16px;
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(90deg, #1e40af, #2563eb);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: .14;
    line-height: 1;
    pointer-events: none;
}

.step-title {
    font-size: 20px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 6px;
    position: relative;
    z-index: 1;
}

.step-en {
    display: inline-block;
    font-size: 12px;
    color: var(--blue);
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 14px;
    padding: 3px 12px;
    border-radius: 999px;
    background: var(--blue-light);
    border: 1px solid #dbeafe;
    position: relative;
    z-index: 1;
}

.step-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.85;
    position: relative;
    z-index: 1;
}

/* ====== 总结 ====== */
.summary-box {
    background: linear-gradient(135deg, #f0f6ff 0%, #f0faff 100%);
    border: 1px solid rgba(37, 99, 235, .14);
    border-radius: 14px;
    padding: 30px 36px;
    display: flex;
    gap: 24px;
    align-items: flex-start;
    box-shadow: 0 4px 20px rgba(37, 99, 235, .05);
    transition: all .3s;
}

.summary-box:hover {
    box-shadow: 0 10px 30px rgba(37, 99, 235, .1);
    border-color: rgba(37, 99, 235, .28);
}

.summary-box .sm-icon {
    font-size: 2rem;
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #eff6ff, #e0f2fe);
}

.summary-box .sm-text {
    font-size: 15px;
    color: var(--gray-700);
    line-height: 3.9;
    text-align: justify;
}

.summary-box .sm-text strong {
    color: #1e40af;
    font-weight: 700;
}

/* ====== 关于页响应式 ====== */
@media(max-width:1024px) {
    .intro-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .intro-photo {
        max-width: 680px;
        margin: 0 auto;
        padding: 0 24px 32px 0;
    }

    .intro-text {
        max-width: 680px;
        margin: 0 auto;
    }

    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 34px 16px;
    }

    .stat-item + .stat-item::before {
        display: none;
    }

    .biz-grid {
        grid-template-columns: 1fr;
    }

    .step-row {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media(max-width:720px) {
    .about-stats-band {
        padding: 44px 0;
    }

    .intro-photo {
        padding: 0 14px 20px 0;
    }

    .photo-frame {
        flex: none;
        min-height: 240px;
        aspect-ratio: 16 / 9;
    }

    .photo-tag {
        top: 12px;
        left: 12px;
        font-size: 12px;
        padding: 5px 12px;
    }

    .photo-badge {
        right: 0;
        bottom: 0;
        padding: 13px 16px;
        gap: 10px;
        border-radius: 12px;
    }

    .photo-badge strong {
        font-size: 30px;
    }

    .photo-badge em {
        font-size: 12px;
    }

    .intro-text h3 {
        font-size: 22px;
    }

    .biz-card {
        padding: 26px 22px 24px;
    }

    .step-row {
        grid-template-columns: 1fr;
    }

    .summary-box {
        flex-direction: column;
        padding: 24px 22px;
    }
}