.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font-serif-cn);
    font-size: 0.95rem;
    letter-spacing: 0.1em;
    border-radius: var(--r-sm);
    transition: all var(--t-base);
    cursor: pointer;
    border: 1px solid transparent;
}
.btn-primary {
    background: var(--c-tea);
    color: var(--c-cream);
}
.btn-primary:hover {
    background: var(--c-vermilion);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.btn-ghost {
    color: var(--c-tea);
    border-color: var(--c-tea);
    background: transparent;
}
.btn-ghost:hover {
    background: var(--c-tea);
    color: var(--c-cream);
}
.btn-lg { padding: 16px 40px; font-size: 1rem; }

.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 20px 0;
    transition: all var(--t-base);
    background: transparent;
}
.site-header.scrolled {
    background: rgba(42,27,18,0.95);
    backdrop-filter: blur(10px);
    padding: 12px 0;
    box-shadow: var(--shadow-md);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--c-cream);
    font-family: var(--font-serif-cn);
}
.brand-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px; height: 44px;
    background: transparent;
    flex-shrink: 0;
}
.brand-mark img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}
.brand-name {
    font-size: 1.3rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    line-height: 1.1;
    color: var(--c-cream);
}
.brand-sub {
    display: block;
    font-family: var(--font-serif-en);
    font-size: 0.65rem;
    letter-spacing: 0.35em;
    color: var(--c-sand);
    margin-top: 4px;
    font-weight: 400;
}
.primary-nav {
    display: flex;
    gap: 36px;
}
.nav-link {
    font-family: var(--font-serif-cn);
    color: var(--c-cream);
    font-size: 0.95rem;
    letter-spacing: 0.15em;
    position: relative;
    padding: 4px 0;
    opacity: 0.85;
    transition: opacity var(--t-fast);
}
.nav-link:hover, .nav-link.active { opacity: 1; }
.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -4px; left: 0; right: 0;
    height: 1px;
    background: var(--c-sand);
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
}
.nav-toggle span {
    width: 24px; height: 1.5px;
    background: var(--c-cream);
    transition: all var(--t-fast);
}
@media (max-width: 900px) {
    .primary-nav {
        position: fixed;
        top: 0; right: -100%;
        width: 70%; max-width: 320px;
        height: 100vh;
        background: var(--c-tea-deep);
        flex-direction: column;
        gap: 0;
        padding: 80px 32px 32px;
        transition: right var(--t-base);
    }
    .primary-nav.open { right: 0; }
    .primary-nav .nav-link {
        padding: 16px 0;
        border-bottom: 1px solid rgba(245,239,230,0.1);
    }
    .nav-toggle { display: flex; }
}

.img-placeholder {
    width: 100%;
    aspect-ratio: 4 / 3;
    background: linear-gradient(135deg, #E8DFCF 0%, #D4C5AC 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-ink-3);
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    border-radius: var(--r-sm);
    position: relative;
    overflow: hidden;
}
.img-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(45deg, rgba(62,42,31,0.04) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(62,42,31,0.04) 25%, transparent 25%);
    background-size: 20px 20px;
}
.img-placeholder.tall { aspect-ratio: 3 / 4; }

.site-footer {
    background: var(--c-tea-deep);
    color: rgba(245,239,230,0.8);
    padding: 64px 0 24px;
    margin-top: 96px;
}
.footer-inner {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: 48px;
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 14px;
    color: var(--c-cream);
}
.footer-brand small { color: rgba(245,239,230,0.6); font-size: 0.85rem; }
.footer-cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.footer-cols h4 {
    color: var(--c-cream);
    font-size: 0.95rem;
    margin-bottom: 16px;
    letter-spacing: 0.2em;
}
.footer-cols a, .footer-cols p {
    display: block;
    color: rgba(245,239,230,0.7);
    font-size: 0.9rem;
    line-height: 2;
    margin-bottom: 4px;
}
.footer-cols a:hover { color: var(--c-sand); }
.footer-bottom {
    grid-column: 1 / -1;
    border-top: 1px solid rgba(245,239,230,0.15);
    padding-top: 24px;
    margin-top: 24px;
    text-align: center;
    color: rgba(245,239,230,0.5);
}
@media (max-width: 768px) {
    .footer-inner { grid-template-columns: 1fr; }
    .footer-cols { grid-template-columns: 1fr 1fr; }
}



/* ========== Apple 风格顶部导航（与首页一致）========== */
.b-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: 44px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--a-line, #D2D2D7);
}

.b-nav-inner {
    max-width: 1024px;
    margin: 0 auto;
    height: 100%;
    padding: 0 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    letter-spacing: -0.01em;
    gap: 24px;
}

.b-logo {
    display: flex;
    align-items: center;
    height: 44px;
}

.b-logo-img {
    height: 32px;
    width: auto;
    display: block;
}

.b-nav-list {
    display: flex;
    gap: 36px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.b-nav-list a {
    color: var(--a-text, #1D1D1F);
    opacity: 0.85;
    transition: opacity 0.2s;
    font-size: 13px;
    text-decoration: none;
}

.b-nav-list a:hover,
.b-nav-list a.active {
    opacity: 1;
    color: var(--a-text, #1D1D1F);
}

.b-nav-icon {
    width: 16px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--a-text, #1D1D1F);
    opacity: 0.85;
    text-decoration: none;
}

@media (max-width: 833px) {
    .b-nav-list { display: none; }
}