/* ===========================================
   帮助中心 — Scandinavian Clean / Nordic Minimal
   =========================================== */

main {
    padding-top: 60px;
    background: var(--bg-primary);
    min-height: 100vh;
}

/* ===========================================
   Hero Band
   =========================================== */

.help-hero {
    background: var(--accent-soft);
    padding: 72px 0 64px;
    text-align: center;
}

.help-hero-inner {
    max-width: 640px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.help-hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(28px, 4vw, 42px);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.25;
    margin-bottom: 12px;
}

.help-hero-sub {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 32px;
}

.help-search {
    display: flex;
    align-items: center;
    gap: 14px;
    max-width: 520px;
    margin: 0 auto;
    padding: 14px 22px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 48px;
    box-shadow: var(--shadow-md);
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.help-search:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow-md);
}

.help-search i {
    font-size: 16px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.help-search input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 15px;
    font-family: var(--font-body);
    color: var(--text-primary);
    background: transparent;
    line-height: 1.5;
}

.help-search input::placeholder {
    color: var(--text-light);
}

/* ===========================================
   Container
   =========================================== */

.help-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ===========================================
   Tab Bar
   =========================================== */

.help-browse {
    padding: 48px 0 0;
}

.help-tabs {
    display: flex;
    align-items: center;
    gap: 6px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.help-tabs::-webkit-scrollbar {
    display: none;
}

.help-tab {
    flex-shrink: 0;
    padding: 8px 18px;
    font-size: 14px;
    font-weight: 500;
    font-family: var(--font-body);
    color: var(--text-muted);
    background: none;
    border: 1px solid transparent;
    border-radius: 48px;
    cursor: pointer;
    transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
    white-space: nowrap;
}

.help-tab:hover {
    color: var(--text-primary);
    background: var(--bg-subtle);
}

.help-tab.active {
    color: var(--accent);
    background: var(--accent-soft);
    border-color: var(--accent-border);
}

/* ===========================================
   Card Grid
   =========================================== */

.help-card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 32px 0 0;
}

.help-card {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
    cursor: pointer;
}

.help-card:hover {
    border-color: var(--accent-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.help-card--hidden {
    display: none !important;
}

.help-card-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-soft);
    border-radius: var(--radius-md);
    color: var(--accent);
    font-size: 16px;
    flex-shrink: 0;
    margin-bottom: 4px;
}

.help-card h3 {
    font-family: var(--font-heading);
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.help-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.65;
}

/* ===========================================
   Detail Sections
   =========================================== */

.help-details {
    padding: 64px 0 0;
}

.help-detail-group {
    margin-bottom: 48px;
}

.help-detail-group:last-child {
    margin-bottom: 0;
}

.help-group-title {
    font-family: var(--font-heading);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
    padding-bottom: 12px;
    border-bottom: 2px solid var(--accent);
    margin-bottom: 0;
    display: inline-block;
}

.help-block {
    padding: 28px 0;
    border-bottom: 1px solid var(--border);
}

.help-detail-group .help-block:last-child {
    border-bottom: none;
}

.help-block h3 {
    font-family: var(--font-heading);
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
    line-height: 1.4;
}

.help-block p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-body);
}

/* ===========================================
   CTA Band
   =========================================== */

.help-cta-band {
    padding: 72px 0 80px;
    margin-top: 64px;
    background: var(--bg-subtle);
    border-top: 1px solid var(--border);
}

.help-cta-inner {
    text-align: center;
}

.help-cta-inner h2 {
    font-family: var(--font-heading);
    font-size: clamp(22px, 3vw, 30px);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.help-cta-inner p {
    font-size: 15px;
    color: var(--text-muted);
    margin-bottom: 28px;
}

/* ===========================================
   Responsive
   =========================================== */

@media (max-width: 768px) {
    .help-hero {
        padding: 56px 0 48px;
    }

    .help-hero h1 {
        font-size: 26px;
    }

    .help-hero-sub {
        font-size: 14px;
        margin-bottom: 24px;
    }

    .help-search {
        padding: 12px 18px;
    }

    .help-search input {
        font-size: 14px;
    }

    .help-browse {
        padding: 32px 0 0;
    }

    .help-tabs {
        gap: 4px;
        padding-bottom: 16px;
    }

    .help-tab {
        padding: 7px 14px;
        font-size: 13px;
    }

    .help-card-grid {
        grid-template-columns: 1fr;
        gap: 12px;
        padding-top: 24px;
    }

    .help-card {
        padding: 20px;
    }

    .help-details {
        padding: 48px 0 0;
    }

    .help-detail-group {
        margin-bottom: 36px;
    }

    .help-block {
        padding: 22px 0;
    }

    .help-block h3 {
        font-size: 16px;
    }

    .help-block p {
        font-size: 14px;
    }

    .help-cta-band {
        padding: 56px 0 64px;
        margin-top: 48px;
    }

    .help-cta-inner h2 {
        font-size: 22px;
    }
}

@media (max-width: 480px) {
    .help-hero {
        padding: 44px 0 36px;
    }

    .help-hero h1 {
        font-size: 22px;
    }

    .help-search {
        padding: 11px 16px;
        gap: 10px;
    }

    .help-search input {
        font-size: 13px;
    }

    .help-tab {
        padding: 6px 12px;
        font-size: 12px;
    }

    .help-card {
        padding: 16px;
    }

    .help-card-icon {
        width: 36px;
        height: 36px;
        font-size: 14px;
    }

    .help-card h3 {
        font-size: 14px;
    }

    .help-card p {
        font-size: 12px;
    }

    .help-block h3 {
        font-size: 15px;
    }

    .help-block p {
        font-size: 13px;
    }

    .help-cta-band {
        padding: 44px 0 52px;
        margin-top: 36px;
    }
}