/* ==========================================================================
   百年之约 · layout.css —— 页头 / 导航 / 抽屉 / 页脚
   ========================================================================== */

/* ---------- 页头 ---------- */
.masthead {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--ink);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(8px);
}
.masthead__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    height: 72px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}
.brand__seal { transform: rotate(-3deg); }
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__name {
    font-family: var(--font-serif);
    font-size: 19px;
    font-weight: 700;
    letter-spacing: 0.14em;
}
.brand__sub {
    font-family: var(--font-num);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--gold);
    text-transform: uppercase;
}

.nav { display: flex; gap: 4px; }
.nav__link {
    padding: 8px 16px;
    font-size: 14px;
    letter-spacing: 0.1em;
    color: var(--paper-dim);
    border-bottom: 2px solid transparent;
    transition: color 0.2s ease, border-color 0.2s ease;
}
.nav__link:hover { color: var(--paper); }
.nav__link.is-current {
    color: var(--paper);
    border-bottom-color: var(--seal);
}

.masthead__tools { display: flex; align-items: center; gap: 10px; }
.masthead__login { display: inline-flex; }
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px; height: 36px;
    color: var(--paper-dim);
    border: 1px solid transparent;
    border-radius: var(--radius);
    transition: color 0.2s ease, border-color 0.2s ease;
}
.icon-btn:hover { color: var(--gold); border-color: var(--line); }
.masthead__compact { display: none; gap: 4px; }

/* ---------- 抽屉 ---------- */
.drawer {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: min(320px, 84vw);
    background: var(--ink-2);
    border-left: 1px solid var(--line-strong);
    padding: 96px 28px 28px;
    z-index: 80;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    box-shadow: var(--shadow);
}
.drawer.is-open { transform: none; }
.drawer__nav { display: flex; flex-direction: column; gap: 4px; margin-bottom: 40px; }
.drawer__nav a {
    padding: 12px 8px;
    font-family: var(--font-serif);
    font-size: 20px;
    letter-spacing: 0.12em;
    color: var(--paper);
    border-bottom: 1px solid var(--line);
}
.drawer__nav a:hover { color: var(--gold); }
.drawer__foot { display: flex; gap: 10px; }
.drawer__foot .btn { flex: 1; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line-strong); margin-top: 0; }
.footer__donate {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 26px 0;
    border-bottom: 1px solid var(--line);
}
.footer__donate-main { display: flex; align-items: center; gap: 16px; }
.footer__donate strong {
    font-family: var(--font-serif);
    font-size: 18px;
    letter-spacing: 0.1em;
    display: block;
}
.footer__donate p { color: var(--paper-dim); font-size: 13px; }

.footer__main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding: 44px 0 36px;
}
.footer__brand-mark { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer__brand p { font-size: 13px; color: var(--paper-dim); max-width: 380px; margin-bottom: 16px; }
.footer__meta-list { display: flex; flex-wrap: wrap; gap: 10px 22px; font-size: 12px; color: var(--paper-dim); }
.footer__meta-list b { color: var(--gold); font-weight: 600; margin-right: 4px; }

.footer__col h3 {
    font-family: var(--font-serif);
    font-size: 15px;
    letter-spacing: 0.18em;
    margin-bottom: 16px;
    color: var(--gold);
}
.footer__col ul { display: flex; flex-direction: column; gap: 10px; }
.footer__col a { font-size: 13px; color: var(--paper-dim); transition: color 0.2s ease; }
.footer__col a:hover { color: var(--paper); }

.footer__base {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 0;
    border-top: 1px solid var(--line);
    font-size: 12px;
    color: var(--paper-dim);
}
.footer__base-links { display: flex; gap: 18px; }
.footer__base-links a:hover { color: var(--paper); }

@media (max-width: 1024px) {
    .nav, .masthead__tools .masthead__login, .masthead__tools .icon-btn:first-child { display: none; }
    .masthead__compact { display: flex; }
    .footer__main { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 760px) {
    .masthead__bar { height: 64px; }
    .brand__name { font-size: 17px; }
    .footer__donate { flex-direction: column; align-items: flex-start; gap: 14px; }
    .footer__main { grid-template-columns: 1fr; }
    .footer__base { flex-direction: column; align-items: flex-start; }
}