/* ============================================================
   #index1 - index5-like proof card section
   ============================================================ */

#index1 {
    --i1-mobile-pad: var(--mobile-page-pad-x, 16px);
    --i1-ink: #201b18;
    --i1-text: #544a44;
    --i1-muted: #7f736d;
    --i1-card: #fff;
    --i1-soft: #fff7f2;
    --i1-line: rgba(var(--clr-primary-rgb), .14);
    --i1-shadow: 0 14px 34px rgba(80, 39, 20, .09);
    margin: 0 auto;
    overflow: hidden;
    background: #fffaf7;
    color: var(--i1-ink);
    text-align: left;
}

#index1 *,
#index1 *::before,
#index1 *::after {
    box-sizing: border-box;
}

#index1 :where(h2, h3, p, figure, ul) {
    margin: 0;
}

#index1 .i1-inner {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding-left: var(--container-pad);
    padding-right: var(--container-pad);
}

#index1 .i1-head {
    padding: 0 var(--i1-mobile-pad);
}

#index1 .i1-head h2 {
    color: var(--i1-ink);
    font-family: 'Noto Serif SC', 'Source Han Serif', 'PingFang SC', serif;
    font-size: 31px;
    font-weight: 900;
    line-height: 1.18;
    letter-spacing: 0;
}

#index1 .i1-head p {
    max-width: 720px;
    margin-top: 12px;
    color: var(--i1-text);
    font-size: var(--font-size-14);
    font-weight: 600;
    line-height: 1.75;
}

#index1 .i1-impact {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    margin-top: 18px;
    padding: 0 var(--i1-mobile-pad);
    overflow: visible;
}

#index1 .i1-impact > div {
    min-width: 0;
    padding: 13px 12px;
    border: 1px solid var(--i1-line);
    border-radius: 12px;
    background: var(--i1-card);
    box-shadow: 0 8px 20px rgba(80, 39, 20, .055);
}

#index1 .i1-impact strong {
    display: block;
    color: var(--clr-primary);
    font-family: 'DIN Alternate', Arial, sans-serif;
    font-size: 33px;
    font-weight: 900;
    line-height: .95;
}

#index1 .i1-impact span {
    display: block;
    margin-top: 5px;
    color: var(--i1-muted);
    font-size: var(--font-size-14);
    font-weight: 800;
    line-height: 1.25;
}

/* ── i1-principal · 对齐 course.php 章老师卡片 (.case-section .teacher-card) 风格 ──
   移动端：圆形头像 72×72 浮动左侧，文字环绕 → 紧凑省空间
   桌面端：flex 居中，圆形头像 110×110，旁边大段叙述 */
#index1 .i1-principals {
    display: grid;
    gap: 16px;
    margin-top: 12px;
}

#index1 .i1-principal {
    display: block;                 /* mobile：让 img 浮动后文字环绕 */
    text-align: left;
    padding: 22px 18px;
    border: 1px solid #ebebeb;
    background-color: #ffffff82;
    border-radius: 18px;
    box-shadow:
        0 12px 30px -12px rgba(80, 45, 20, .16),
        0 2px 6px -2px rgba(20, 14, 10, .05);
}

#index1 .i1-principal::after {
    content: '';
    display: block;
    clear: both;
}

#index1 .i1-portrait {
    float: left;
    width: 72px;
    height: 72px;
    margin: 4px 14px 8px 0;
    border-radius: 50%;
    object-fit: cover;
    object-position: center top;
    box-shadow: 0 3px 12px rgba(0, 0, 0, .12);
    background: #eee;
}

#index1 .i1-bio {
    min-width: 0;
}

#index1 .i1-h {
    margin: 0 0 6px;
    color: #1a1a1a;
    font-size: var(--font-size-18);
    font-weight: 700;
    line-height: 1.35;
}

#index1 .i1-tag {
    display: inline-block;
    margin-bottom: 14px;
    padding: 3px 10px;
    background: var(--clr-primary);
    color: #fff;
    border-radius: 100px;
    font-size: var(--font-size-14);
    font-weight: 700;
    line-height: 1.4;
}

#index1 .i1-p {
    clear: none;
    margin: 0;
    color: #555;
    font-size: var(--font-size-14);
    font-weight: 400;
    line-height: 1.7;
}

@media (min-width: 640px) {
    #index1 {
        padding: 48px 24px 54px;
    }

    #index1 .i1-head,
    #index1 .i1-principals,
    #index1 .i1-impact {
        padding-inline: 0;
    }

    #index1 .i1-head h2 {
        max-width: 760px;
        font-size: 44px;
    }

    #index1 .i1-head p {
        font-size: var(--font-size-16);
    }

    #index1 .i1-impact {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }

    #index1 .i1-principals {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 24px;
        margin-top: 18px;
    }

    #index1 .i1-principal {
        display: flex;
        align-items: center;
        gap: 28px;
        padding: 32px;
    }

    #index1 .i1-principal::after {
        display: none;
    }

    #index1 .i1-portrait {
        float: none;
        flex-shrink: 0;
        width: 110px;
        height: 110px;
        margin: 0;
        align-self: flex-start;
        box-shadow: 0 4px 20px rgba(0, 0, 0, .13);
    }

    #index1 .i1-h {
        margin: 0 0 10px;
        font-size: var(--font-size-22);
        line-height: 1.36;
    }

    #index1 .i1-tag {
        margin-bottom: 16px;
        padding: 4px 14px;
        font-size: var(--font-size-14);
    }

    #index1 .i1-p {
        font-size: var(--font-size-16);
        line-height: 1.85;
    }
}

/* ============================================================
   #index1-proof - 从 index1 抽离的选择理由图文板块
   ============================================================ */

#index1-proof.i1p-section {
    --i1p-ink: #211d1a;
    --i1p-muted: #665d58;
    --i1p-line: rgba(70, 51, 40, .13);
    display: block;
    padding-right: 16px;
    padding-left: 16px;
    padding-bottom: 34px;
    color: var(--i1p-ink);
    background: #fff;
    text-align: left;
}

#index1-proof.i1p-section *,
#index1-proof.i1p-section *::before,
#index1-proof.i1p-section *::after {
    box-sizing: border-box;
}

#index1-proof :where(h2, p, figure) {
    margin: 0;
}

#index1-proof img {
    display: block;
    max-width: 100%;
}

#index1-proof .i1p-shell {
    max-width: 1120px;
    margin: 0 auto;
}

#index1-proof h2 {
    color: var(--i1p-ink);
    font-size: 28px;
    line-height: 1.16;
    font-weight: 900;
    letter-spacing: 0;
    text-align: left;
}

#index1-proof .i1p-head > p:last-child {
    max-width: 42em;
    color: var(--i1p-muted);
    font-size: var(--font-size-16);
    line-height: 1.62;
}

#index1-proof .i1p-mobile-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

#index1-proof .i1p-feature,
#index1-proof .i1p-point {
    overflow: hidden;
    border: 1px solid var(--i1p-line);
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 8px 22px rgba(82, 41, 20, .08);
}

#index1-proof .i1p-feature {
    position: relative;
    box-shadow: 0 14px 32px rgba(82, 41, 20, .14);
}

#index1-proof .i1p-feature-viewport {
    overflow: hidden;
}

#index1-proof .i1p-feature-track {
    display: flex;
}

#index1-proof .i1p-feature-slide {
    flex: 0 0 100%;
    min-width: 0;
}

#index1-proof .i1p-feature img {
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    transition: opacity .22s ease, transform .22s ease;
}

#index1-proof .i1p-feature.is-changing img {
    opacity: .84;
    transform: scale(1.015);
}

#index1-proof .i1p-feature figcaption {
    position: absolute;
    left: 10px;
    right: 10px;
    bottom: 10px;
    display: grid;
    gap: 6px;
    padding: 12px;
    color: #fff;
    background: rgba(35, 31, 29, .76);
    border-radius: 10px;
    backdrop-filter: blur(8px);
}

#index1-proof .i1p-feature span {
    width: fit-content;
    padding: 4px 8px;
    color: #ffe0d2;
    background: rgba(255, 255, 255, .13);
    border-radius: 999px;
    font-size: var(--font-size-14);
    font-weight: 900;
    line-height: 1.2;
}

#index1-proof .i1p-feature strong {
    color: #fff;
    font-size: var(--font-size-18);
    line-height: 1.32;
}

#index1-proof .i1p-points {
    display: grid;
    gap: 8px;
}

#index1-proof .i1p-mobile-cue {
    width: fit-content;
    padding: 5px 9px;
    color: var(--clr-primary);
    background: rgba(var(--clr-primary-rgb), .08);
    border-radius: 999px;
    font-size: var(--font-size-14);
    font-weight: 800;
    line-height: 1.25;
}

#index1-proof .i1p-point {
    position: relative;
    display: grid;
    gap: 5px;
    margin: 0;
    padding: 12px 13px;
    color: var(--i1p-muted);
    font: inherit;
    text-align: left;
    appearance: none;
    cursor: pointer;
    transition: border-color .22s ease, box-shadow .22s ease, transform .22s ease;
}

#index1-proof .i1p-point::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(var(--clr-primary-rgb), .11), rgba(255, 107, 53, .09));
    opacity: 0;
    transform: translateX(-10px);
    transition: opacity .22s ease, transform .22s ease;
    pointer-events: none;
}

#index1-proof .i1p-point b,
#index1-proof .i1p-point span {
    position: relative;
    z-index: 1;
}

#index1-proof .i1p-point:focus-visible {
    outline: 2px solid rgba(var(--clr-primary-rgb), .45);
    outline-offset: 2px;
}

#index1-proof .i1p-point.is-active {
    border-color: rgba(var(--clr-primary-rgb), .38);
    box-shadow: 0 8px 22px rgba(var(--clr-primary-rgb), .12);
    transform: translateY(-1px);
}

#index1-proof .i1p-point.is-active::before {
    opacity: 1;
    transform: translateX(0);
}

#index1-proof .i1p-point.is-active b {
    color: var(--clr-primary);
}

#index1-proof .i1p-point b {
    color: var(--i1p-ink);
    font-size: var(--font-size-16);
    line-height: 1.3;
}

#index1-proof .i1p-point span {
    color: var(--i1p-muted);
    font-size: var(--font-size-14);
    line-height: 1.45;
}

@media (min-width: 720px) {
    #index1-proof.i1p-section {
        padding: 56px 24px;
    }

    #index1-proof h2 {
        font-size: 34px;
        line-height: 1.2;
    }

    #index1-proof .i1p-head > p:last-child {
        font-size: var(--font-size-16);
        line-height: 1.68;
    }

}