/* ========================================
   Layout — Global Layout & Container
   ======================================== */

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

/* ===== Container ===== */
.section__container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ===== Section Base ===== */
section {
    padding: var(--space-section) 0;
    position: relative;
    overflow: hidden;
}

/* ===== Section Header ===== */
.section__label {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.section__title {
    font-size: clamp(var(--font-size-2xl), 5vw, var(--font-size-4xl));
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
    text-wrap: balance;
}

/* 联系区标题在窄列里容易被拆出孤字，单独收一档 */
.contact__info .section__title {
    font-size: clamp(var(--font-size-2xl), 3.4vw, 2.9rem);
    text-wrap: nowrap;
}

@media (max-width: 900px) {
    .contact__info .section__title {
        text-wrap: wrap;
    }
}

/* ===== Gradient Text ===== */
.gradient-text {
    background: linear-gradient(
        135deg,
        var(--color-gradient-start) 0%,
        var(--color-gradient-end) 100%
    );
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ===== Grid Utilities ===== */
.about__grid,
.contact__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

/* ===== Selection ===== */
::selection {
    background: var(--color-primary);
    color: #fff;
}

/* ===== Scrollbar (Webkit) ===== */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-tertiary);
}