/* =============================================================
   About Us Page — page-about.php
   ============================================================= */

/* ── Section wrapper ───────────────────────────────────────── */
.aceweld-about {
    padding: 3rem 0 5rem;
}

/* ── Tab Navigation ────────────────────────────────────────── */
.aceweld-about__tabs {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0;
    border-bottom: 2px solid var(--aceweld-border);
    margin-bottom: 3rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

@media (max-width: 959px) {
    .aceweld-about__tabs {
        flex-wrap: nowrap;
        justify-content: flex-start;
    }
}
.aceweld-about__tabs::-webkit-scrollbar { display: none; }

.aceweld-about__tab {
    flex-shrink: 0;
    padding: .9rem 2rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    font: inherit;
    font-family: var(--aceweld-heading-font);
    font-size: .9375rem;
    font-weight: 600;
    color: var(--aceweld-muted);
    cursor: pointer;
    transition: color .2s, border-color .2s;
    white-space: nowrap;
}
.aceweld-about__tab:hover { color: #1e3058; }
.aceweld-about__tab.is-active {
    color: #1e3058;
    border-bottom-color: #1e3058;
}

/* ── Panels ─────────────────────────────────────────────────── */
.aceweld-about__panel { display: none; animation: aceweld-fadein .25s ease; }
.aceweld-about__panel.is-active { display: block; }

@keyframes aceweld-fadein {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Shared: heading / label ─────────────────────────────── */
.aceweld-about__label {
    display: inline-block;
    font-size: .75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: #e85c0d;
    margin-bottom: .75rem;
}

.aceweld-about__heading {
    font-family: var(--aceweld-heading-font);
    font-size: 1.75rem;
    font-weight: 700;
    color: #1e3058;
    margin: 0 0 1.25rem;
    line-height: 1.3;
}
.aceweld-about__heading--center {
    text-align: center;
    margin-bottom: 2.5rem;
}

/* ── Placeholder image blocks ────────────────────────────── */
.aceweld-about__placeholder {
    width: 100%;
    background:
        repeating-linear-gradient(
            45deg,
            rgba(30,48,88,.045),
            rgba(30,48,88,.045) 4px,
            transparent 4px,
            transparent 12px
        ),
        #e8ecf4;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.aceweld-about__placeholder::after {
    content: '';
    display: block;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: rgba(30,48,88,.1);
}

/* ── Panel 1: 公司介绍 ──────────────────────────────────── */
.aceweld-about__intro {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4.5rem;
    align-items: center;
}
.aceweld-about__intro-media .aceweld-about__placeholder {
    aspect-ratio: 4 / 3;
}

.aceweld-about__intro-body p {
    color: var(--aceweld-muted);
    margin: 0 0 .9rem;
    line-height: 1.8;
}

.aceweld-about__points {
    list-style: none;
    margin: 1.5rem 0 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: .7rem;
}
.aceweld-about__points li {
    display: flex;
    align-items: center;
    gap: .65rem;
    font-size: .9375rem;
    color: var(--aceweld-text);
    font-weight: 500;
}
.aceweld-about__points li svg {
    color: #1e3058;
    flex-shrink: 0;
}

@media (max-width: 900px) {
    .aceweld-about__intro {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* ── Panel 2: 公司环境 ──────────────────────────────────── */
.aceweld-about__env-head {
    text-align: center;
    margin-bottom: 2.5rem;
}
.aceweld-about__env-desc {
    color: var(--aceweld-muted);
    font-size: 1rem;
    margin: 0 auto;
    max-width: 600px;
    line-height: 1.75;
}

.aceweld-about__env-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}
.aceweld-about__env-card {
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--aceweld-border);
    background: #fff;
    transition: box-shadow .25s, transform .25s;
}
.aceweld-about__env-card:hover {
    box-shadow: 0 8px 28px rgba(30,48,88,.1);
    transform: translateY(-3px);
}

.aceweld-about__env-img.aceweld-about__placeholder {
    aspect-ratio: 16 / 9;
    border-radius: 0;
}
.aceweld-about__env-img.aceweld-about__placeholder::after { display: none; }

.aceweld-about__env-caption {
    padding: 1.1rem 1.25rem 1.35rem;
}
.aceweld-about__env-caption h3 {
    font-family: var(--aceweld-heading-font);
    font-size: 1rem;
    font-weight: 700;
    color: #1e3058;
    margin: 0 0 .4rem;
}
.aceweld-about__env-caption p {
    font-size: .875rem;
    color: var(--aceweld-muted);
    margin: 0;
    line-height: 1.65;
}

@media (max-width: 960px) {
    .aceweld-about__env-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 580px) {
    .aceweld-about__env-grid { grid-template-columns: 1fr; }
}

/* ── Panel 3: 公司成就 ──────────────────────────────────── */
.aceweld-about__stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 4rem;
}
.aceweld-about__stat-card {
    text-align: center;
    padding: 2rem 1.25rem;
    border-radius: 12px;
    background: #f8fafc;
    border: 1px solid var(--aceweld-border);
    transition: box-shadow .25s, transform .25s;
}
.aceweld-about__stat-card:hover {
    box-shadow: 0 6px 24px rgba(30,48,88,.1);
    transform: translateY(-2px);
}
.aceweld-about__stat-icon {
    margin-bottom: .75rem;
    color: #1e3058;
    display: flex;
    justify-content: center;
}
.aceweld-about__stat-number {
    font-family: var(--aceweld-heading-font);
    font-size: 2.25rem;
    font-weight: 800;
    color: #1e3058;
    line-height: 1.1;
    margin-bottom: .4rem;
}
.aceweld-about__stat-label {
    font-size: .875rem;
    color: var(--aceweld-muted);
    font-weight: 500;
}

@media (max-width: 960px) {
    .aceweld-about__stats { grid-template-columns: repeat(2, 1fr); }
}

/* ── Timeline ────────────────────────────────────────────── */
.aceweld-about__milestones { position: relative; }

.aceweld-about__timeline {
    position: relative;
    padding: 1rem 0 .5rem;
    max-width: 860px;
    margin: 0 auto;
}
.aceweld-about__timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0; bottom: 0;
    width: 2px;
    background: var(--aceweld-border);
    transform: translateX(-50%);
}

.aceweld-about__milestone {
    display: grid;
    grid-template-columns: 1fr 40px 1fr;
    gap: 1.25rem;
    align-items: center;
    margin-bottom: 2.25rem;
}

/* Left side: year right-aligned, content left-aligned */
.aceweld-about__milestone--left .aceweld-about__milestone-year    { text-align: right; }
.aceweld-about__milestone--left .aceweld-about__milestone-content { text-align: left; }

/* Right side: reorder columns */
.aceweld-about__milestone--right .aceweld-about__milestone-year    { order: 3; text-align: left; }
.aceweld-about__milestone--right .aceweld-about__milestone-dot     { order: 2; }
.aceweld-about__milestone--right .aceweld-about__milestone-content { order: 1; text-align: right; }

.aceweld-about__milestone-year {
    font-family: var(--aceweld-heading-font);
    font-size: 1.375rem;
    font-weight: 800;
    color: #1e3058;
}
.aceweld-about__milestone-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #1e3058;
    border: 3px solid #fff;
    box-shadow: 0 0 0 2px #1e3058;
    justify-self: center;
    flex-shrink: 0;
}
.aceweld-about__milestone-content {
    background: #fff;
    border: 1px solid var(--aceweld-border);
    border-radius: 10px;
    padding: 1.1rem 1.25rem;
}
.aceweld-about__milestone-content h3 {
    font-family: var(--aceweld-heading-font);
    font-size: 1rem;
    font-weight: 700;
    color: #1e3058;
    margin: 0 0 .4rem;
}
.aceweld-about__milestone-content p {
    font-size: .875rem;
    color: var(--aceweld-muted);
    margin: 0;
    line-height: 1.65;
}

/* Mobile: collapse to single-column */
@media (max-width: 700px) {
    .aceweld-about__timeline::before { left: 8px; }

    .aceweld-about__milestone {
        grid-template-columns: 24px 1fr;
        grid-template-rows: auto auto;
        gap: .75rem .9rem;
    }
    .aceweld-about__milestone--left .aceweld-about__milestone-year,
    .aceweld-about__milestone--right .aceweld-about__milestone-year {
        grid-column: 2; grid-row: 1;
        order: 0; text-align: left;
        font-size: 1.125rem;
    }
    .aceweld-about__milestone--left .aceweld-about__milestone-dot,
    .aceweld-about__milestone--right .aceweld-about__milestone-dot {
        grid-column: 1; grid-row: 2;
        order: 0; justify-self: center;
    }
    .aceweld-about__milestone--left .aceweld-about__milestone-content,
    .aceweld-about__milestone--right .aceweld-about__milestone-content {
        grid-column: 2; grid-row: 2;
        order: 0; text-align: left;
    }
}

@media (max-width: 480px) {
    .aceweld-about__tab { padding: .75rem 1.25rem; font-size: .875rem; }
    .aceweld-about__heading { font-size: 1.4rem; }
    .aceweld-about__stat-number { font-size: 1.75rem; }
}