:root {
    --paper: #f9fafb;
    --surface: #ffffff;
    --ink: #111827;
    --muted: #6b7280;
    --line: #e5e7eb;
    --accent: #2563eb;
    --accent-soft: #eff6ff;
    --shadow-sm: 0 1px 2px rgba(17, 24, 39, 0.03), 0 8px 24px rgba(17, 24, 39, 0.04);
    --shadow-lg: 0 20px 50px rgba(17, 24, 39, 0.1);
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

html { background: var(--paper); }

body.forum-shell {
    background: var(--paper) !important;
    color: var(--ink);
    letter-spacing: -0.012em;
}

.forum-shell .site-header {
    background: rgba(255, 255, 255, 0.88) !important;
    border-color: var(--line) !important;
    box-shadow: 0 1px rgba(255, 255, 255, 0.7);
}

.site-nav {
    max-width: 1180px !important;
    height: 74px !important;
}

.brand-lockup { gap: 12px !important; }

.brand-mark {
    width: 38px !important;
    height: 38px !important;
    border-radius: 13px !important;
    background: var(--accent) !important;
    box-shadow: none !important;
}

.brand-copy { display: flex; flex-direction: column; line-height: 1; }
.brand-copy strong { font-size: 15px; font-weight: 850; letter-spacing: 0.06em; }
.brand-copy small { margin-top: 5px; color: var(--muted); font-size: 8px; font-weight: 750; letter-spacing: 0.2em; }

.site-header button,
.site-header a { letter-spacing: -0.01em; }

.site-header button.bg-primary-600 {
    border: 1px solid var(--accent) !important;
    border-radius: 13px !important;
    background: var(--accent) !important;
    box-shadow: none !important;
}

.site-header button.bg-primary-600:hover {
    transform: translateY(-2px);
    background: #1d4ed8 !important;
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.2) !important;
}

.site-main {
    max-width: 1180px !important;
    padding-top: 28px !important;
    padding-bottom: 72px !important;
}

.catalog-tabs,
.catalog-filters {
    padding: 0;
    border: 0;
    background: transparent;
}

.catalog-tabs { margin-bottom: 14px !important; border-radius: 0; }
.catalog-filters { margin-bottom: 22px !important; border-radius: 0; }

.catalog-loader {
    position: fixed;
    z-index: 20;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    animation: catalog-loader-enter 0.32s var(--ease-out) both;
}

.catalog-loader-symbol {
    position: relative;
    width: 58px;
    height: 58px;
}

.catalog-loader-symbol::before,
.catalog-loader-symbol::after {
    position: absolute;
    inset: 0;
    content: "";
    border-radius: 999px;
}

.catalog-loader-symbol::before {
    border: 2px solid rgba(37, 99, 235, 0.12);
}

.catalog-loader-symbol::after {
    background: conic-gradient(from 30deg, transparent 0 56%, rgba(37, 99, 235, 0.3) 74%, var(--accent) 100%);
    -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 0);
    mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 0);
    animation: catalog-loader-spin 0.82s linear infinite;
    will-change: transform;
}

.catalog-loader p {
    margin-top: 18px;
    color: var(--muted);
    font-size: 15px;
    font-weight: 650;
    letter-spacing: 0.01em;
    animation: catalog-loader-text 1.5s ease-in-out infinite;
}

.catalog-tabs > div {
    gap: 20px !important;
    padding: 0 2px;
    border-bottom: 1px solid var(--line);
}

.catalog-tabs button,
.catalog-filters button,
.catalog-filters span { letter-spacing: 0; }

.catalog-tabs button {
    position: relative;
    padding: 9px 2px 10px !important;
    border: 0 !important;
    border-radius: 0 !important;
    background: transparent !important;
    box-shadow: none !important;
}

.catalog-tabs button:not(.bg-blue-600) { color: var(--muted) !important; }
.catalog-tabs button.bg-blue-600 { color: var(--accent) !important; }
.catalog-tabs button:hover { color: var(--accent) !important; }

.catalog-tabs button.bg-blue-600::after {
    position: absolute;
    right: 0;
    bottom: -1px;
    left: 0;
    height: 2px;
    content: "";
    border-radius: 2px 2px 0 0;
}

.catalog-tabs button.bg-blue-600::after {
    background: var(--accent);
}

.sort-control { order: 1; }
.tag-filter-list { order: 2; }
.tag-filter-toggle { order: 3; }

.tag-filter-layout.tags-expanded {
    display: block !important;
}

.tags-expanded .sort-control {
    float: left;
    margin: 0 0.5rem 0.5rem 0;
}

.tags-expanded .tag-filter-toggle {
    float: right;
    margin: 0.375rem 0 0.5rem 0.5rem;
}

.tags-expanded .tag-filter-list > div {
    display: block !important;
    max-height: none !important;
    overflow: visible !important;
}

.tags-expanded .tag-filter-list button {
    display: inline-flex;
    margin: 0 0.5rem 0.5rem 0;
    vertical-align: top;
}

.tag-filter-layout.tags-expanded::after {
    display: block;
    clear: both;
    content: "";
}

.forum-card-list {
    display: grid !important;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px !important;
}

.content-card {
    min-width: 0;
    border: 1px solid var(--line) !important;
    border-radius: 21px !important;
    background: var(--surface) !important;
    box-shadow: var(--shadow-sm) !important;
    transition: transform 0.5s var(--ease-out), border-color 0.25s ease, box-shadow 0.5s var(--ease-out) !important;
    animation: card-enter 0.62s var(--ease-out) both;
}

.content-card:nth-child(2) { animation-delay: 40ms; }
.content-card:nth-child(3) { animation-delay: 80ms; }
.content-card:nth-child(4) { animation-delay: 120ms; }
.content-card:nth-child(5) { animation-delay: 160ms; }
.content-card:nth-child(6) { animation-delay: 200ms; }

.content-card:hover {
    z-index: 2;
    border-color: #b9b4aa !important;
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg) !important;
}

.content-card > .relative.flex-shrink-0 { overflow: hidden; }
.content-card img { transition: opacity 0.3s ease, transform 0.8s var(--ease-out) !important; }
.content-card:hover img { transform: scale(1.035); }
.content-card h3 { color: var(--ink) !important; font-weight: 820 !important; letter-spacing: -0.025em; }
.content-card:hover h3 { color: var(--accent) !important; }

.content-card .bg-blue-50,
.content-card .bg-primary-50 { background: var(--accent-soft) !important; }
.content-card .text-blue-600,
.content-card .text-primary-600 { color: var(--accent) !important; }
.content-card .border-blue-100 { border-color: #dbeafe !important; }

@media (min-width: 640px) {
    .card-tags {
        max-height: 2.25rem;
        overflow: hidden;
        align-content: flex-start;
    }
}

.forum-shell input,
.forum-shell select,
.forum-shell textarea {
    border-color: var(--line) !important;
    background-color: var(--surface) !important;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease !important;
}

.forum-shell input:focus,
.forum-shell select:focus,
.forum-shell textarea:focus {
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1) !important;
}

.forum-shell .fixed.inset-0 { animation: veil-in 0.25s ease both; }
.forum-shell .fixed.inset-0 > .bg-white {
    border: 1px solid rgba(255, 255, 255, 0.55);
    background: var(--surface) !important;
    box-shadow: 0 28px 80px rgba(0, 0, 0, 0.2) !important;
}

@keyframes card-enter {
    from { opacity: 0; transform: translateY(18px) scale(0.985); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes veil-in { from { opacity: 0; } to { opacity: 1; } }

@keyframes catalog-loader-enter {
    from { opacity: 0; transform: translateY(7px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes catalog-loader-spin { to { transform: rotate(360deg); } }

@keyframes catalog-loader-text {
    0%, 100% { opacity: 0.62; }
    50% { opacity: 1; }
}

@media (max-width: 900px) {
    .forum-card-list { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .site-nav { height: 64px !important; }
    .brand-copy { display: none; }
    .site-main { padding-top: 18px !important; }
    .catalog-tabs, .catalog-filters { margin-left: -4px; margin-right: -4px; padding: 0 4px; }
    .content-card { min-height: 12rem !important; border-radius: 17px !important; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}