/* ==========================================================================
   collaborate.css — COLLABORATE WITH IDMANOS
   视觉原则：极简、留白、安静，不引入色块与装饰
   ========================================================================== */

.collab {
    max-width: 1200px;
    margin: 0 auto;
    padding: 9rem 6% 7rem;
    box-sizing: border-box;
}

/* 开场 */
.collab-hero {
    max-width: 760px;
}

.collab-hero h1 {
    margin: 0;
    font-size: clamp(1.6rem, 3.2vw, 2.6rem);
    font-weight: 500;
    line-height: 1.25;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: #1a1a1a;
}

.collab-intro {
    margin: 1.6rem 0 0;
    font-size: 1rem;
    font-weight: 300;
    line-height: 1.8;
    color: #4a4a4a;
}

/* 三组合作对象 */
.collab-groups {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2.5rem;
    margin-top: 6rem;
    padding-top: 2.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.collab-group-title {
    margin: 0;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: #1a1a1a;
}

.collab-group-desc {
    margin: 1rem 0 0;
    font-size: 0.88rem;
    font-weight: 300;
    line-height: 1.7;
    color: #8a8a8a;
}

/* GET IN TOUCH */
.collab-contact {
    margin-top: 7rem;
}

.collab-contact-title {
    margin: 0 0 2rem;
    font-size: 0.72rem;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: #9a9a9a;
}

.collab-contact-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    border-top: 1px solid rgba(0, 0, 0, 0.08);
}

.collab-contact-item {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1.5rem;
    padding: 1.1rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    text-decoration: none;
    color: inherit;
}

.collab-contact-list .collab-contact-item:nth-child(odd) {
    padding-right: 2.5rem;
}

.collab-contact-list .collab-contact-item:nth-child(even) {
    padding-left: 2.5rem;
    border-left: 1px solid rgba(0, 0, 0, 0.06);
}

.collab-contact-label {
    flex: 0 0 auto;
    font-size: 0.66rem;
    font-weight: 400;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: #9a9a9a;
}

.collab-contact-value {
    font-size: 0.88rem;
    color: #1a1a1a;
    text-align: right;
    transition: opacity 0.3s ease;
}

a.collab-contact-item:hover .collab-contact-value {
    opacity: 0.6;
}

/* 系统深色模式：与全站暗色语言保持一致（否则深色下文字不可见） */
@media (prefers-color-scheme: dark) {
    .collab-hero h1 {
        color: #e5e5e5;
    }

    .collab-intro {
        color: #a1a1a6;
    }

    .collab-groups {
        border-top-color: rgba(255, 255, 255, 0.10);
    }

    .collab-group-title {
        color: #e5e5e5;
    }

    .collab-group-desc {
        color: #8a8a8a;
    }

    .collab-contact-title {
        color: #6d6d6d;
    }

    .collab-contact-list {
        border-top-color: rgba(255, 255, 255, 0.10);
    }

    .collab-contact-item {
        border-bottom-color: rgba(255, 255, 255, 0.08);
    }

    .collab-contact-list .collab-contact-item:nth-child(even) {
        border-left-color: rgba(255, 255, 255, 0.08);
    }

    .collab-contact-label {
        color: #6d6d6d;
    }

    .collab-contact-value {
        color: #e5e5e5;
    }
}

@media (max-width: 1024px) {
    .collab-groups {
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .collab {
        padding: 7rem 5% 5rem;
    }

    .collab-intro {
        font-size: 0.94rem;
    }

    .collab-groups {
        grid-template-columns: 1fr;
        gap: 2.2rem;
        margin-top: 4rem;
        padding-top: 2rem;
    }

    .collab-contact {
        margin-top: 4.5rem;
    }

    .collab-contact-list {
        grid-template-columns: 1fr;
    }

    .collab-contact-list .collab-contact-item:nth-child(odd) {
        padding-right: 0;
    }

    .collab-contact-list .collab-contact-item:nth-child(even) {
        padding-left: 0;
        border-left: none;
    }
}