/* ==========================================================================
   docs.css — Feature Architecture page styles
   Extends main.css; uses the same design tokens from :root
   ========================================================================== */

/* ==========================================================================
   Page Hero
   ========================================================================== */
.docs-hero {
    padding-top: var(--nav-h);
    border-bottom: 1px solid var(--line);
    position: relative;
}

/* Inner clip wrapper — keeps bg animations clipped without trapping sticky anchor nav */
.docs-hero-clip {
    position: relative;
    overflow: hidden;
}

.docs-hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 70% 40%, rgba(179,155,117,0.04) 0%, transparent 70%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 79px,
            var(--line) 79px,
            var(--line) 80px
        );
    pointer-events: none;
    z-index: 0;
}

.docs-hero-inner {
    display: grid;
    grid-template-columns: 55% 45%;
    min-height: calc(90vh - var(--nav-h));
    align-items: center;
    position: relative;
    z-index: 1;
    gap: 4vw;
    padding-top: 6vw;
    padding-bottom: 6vw;
}

.docs-hero-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.docs-hero-title {
    font-size: clamp(3rem, 5vw, 6rem);
    margin-bottom: 2rem;
}

.docs-hero-actions {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* Architecture diagram */
.docs-hero-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.arch-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    width: 100%;
    max-width: 420px;
}

.arch-node-top {
    background: var(--bg-panel);
    border: 1px solid var(--line-strong);
    padding: 1.2rem 2.5rem;
    text-align: center;
    position: relative;
}

.arch-node-label {
    display: block;
    font-family: var(--font-display);
    font-size: 0.8rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-200);
    margin-bottom: 4px;
}

.arch-node-sub {
    display: block;
    font-size: 0.7rem;
    color: var(--text-400);
    letter-spacing: 1px;
}

.arch-arrow-down {
    width: 1px;
    height: 32px;
    background: linear-gradient(to bottom, var(--gold), var(--gold-dim));
    position: relative;
}

.arch-arrow-down::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 7px solid var(--gold-dim);
}

.arch-core {
    background: var(--bg-panel);
    border: 1px solid var(--gold);
    padding: 1.5rem 3rem;
    text-align: center;
    position: relative;
    width: 100%;
    box-shadow: 0 0 30px rgba(179,155,117,0.1), inset 0 0 30px rgba(179,155,117,0.03);
}

.arch-core-label {
    font-family: var(--font-display);
    font-size: 1.1rem;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 6px;
}

.arch-core-sub {
    font-size: 0.72rem;
    color: var(--text-400);
    letter-spacing: 1px;
}

.arch-core-pulse {
    position: absolute;
    inset: -1px;
    border: 1px solid var(--gold);
    animation: arch-pulse 2.5s ease-in-out infinite;
    pointer-events: none;
}

@keyframes arch-pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50%       { opacity: 0; transform: scale(1.03); }
}

.arch-branches {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    width: 100%;
    padding-top: 1.5rem;
    position: relative;
}

.arch-branches::before {
    content: '';
    position: absolute;
    top: 0;
    left: calc(100% / 6);
    right: calc(100% / 6);
    height: 1px;
    background: var(--line-strong);
}

.arch-branch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.arch-branch-line {
    width: 1px;
    height: 28px;
    background: var(--line-strong);
}

.arch-dest {
    border: 1px solid var(--line-strong);
    background: var(--bg-panel);
    padding: 0.85rem 0.75rem;
    text-align: center;
    width: 100%;
}

.arch-dest span {
    display: block;
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.arch-dest small {
    display: block;
    font-size: 0.58rem;
    color: var(--text-400);
    letter-spacing: 0.5px;
    line-height: 1.4;
}

.arch-dest-proxy { border-color: rgba(179,155,117,0.4); }
.arch-dest-proxy span { color: var(--gold); }
.arch-dest-direct span { color: var(--text-300); }
.arch-dest-reject span { color: #666; }

/* Anchor navigation bar */
.docs-anchor-nav {
    border-top: 1px solid var(--line);
    background: var(--bg-surface);
    position: sticky;
    top: var(--nav-h);
    z-index: 50;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.docs-anchor-list {
    display: flex;
    gap: 0;
    padding: 0;
    white-space: nowrap;
}

.docs-anchor-list li {
    flex-shrink: 0;
}

.docs-anchor-list a {
    display: block;
    padding: 1.1rem 1.5rem;
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-400);
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}

.docs-anchor-list a:hover {
    color: var(--gold);
    border-bottom-color: var(--gold);
}

/* ==========================================================================
   Common section styles
   ========================================================================== */
.docs-section {
    padding: 8vw 0;
    border-bottom: 1px solid var(--line);
}

.docs-section-title {
    font-size: clamp(2.5rem, 4vw, 5rem);
    margin-bottom: 2rem;
}

.docs-section-desc {
    max-width: 680px;
    margin-bottom: 5rem;
}

/* Two-column layout for content sections */
.docs-two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5vw;
    align-items: start;
}

.docs-body-text {
    color: var(--text-300);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.docs-body-text strong { color: var(--text-200); }

.docs-sub-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    letter-spacing: 1px;
    color: var(--text-100);
    margin-bottom: 1rem;
    font-weight: 400;
}

.inline-code {
    font-family: 'Courier New', 'Menlo', monospace;
    font-size: 0.85em;
    color: var(--gold);
    background: var(--gold-dim);
    padding: 1px 6px;
    border-radius: 2px;
}

/* ==========================================================================
   Core Features — hex grid
   ========================================================================== */
.docs-features-section { background: var(--bg-surface); }

.features-hex-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
}

.fhex-card {
    background: var(--bg-surface);
    padding: 3rem 2.5rem;
    transition: background 0.3s ease;
    position: relative;
    overflow: hidden;
}

.fhex-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: transparent;
    transition: background 0.3s ease;
}

.fhex-card:hover { background: var(--bg-panel); }

.fhex-card:hover::before {
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.fhex-icon {
    width: 44px;
    height: 44px;
    margin-bottom: 1.75rem;
    color: var(--gold);
}

.fhex-icon svg {
    width: 100%;
    height: 100%;
}

.fhex-title {
    font-size: 1.1rem;
    color: var(--text-100);
    font-weight: 500;
    margin-bottom: 0.85rem;
    line-height: 1.4;
}

.fhex-desc {
    font-size: 0.9rem;
    color: var(--text-400);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.fhex-link {
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gold);
    transition: opacity 0.2s;
}

.fhex-link:hover { opacity: 0.7; }

/* ==========================================================================
   Rule Engine Section
   ========================================================================== */
.rule-types-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    margin-top: 2.5rem;
    border: 1px solid var(--line);
}

.rule-type-item {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--line);
    border-right: 1px solid var(--line);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.rule-type-item:nth-child(even) { border-right: none; }
.rule-type-item:nth-last-child(-n+2) { border-bottom: none; }

.rt-badge {
    display: inline-block;
    font-family: 'Courier New', 'Menlo', monospace;
    font-size: 0.62rem;
    letter-spacing: 0.5px;
    padding: 3px 8px;
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 2px;
}

.rt-badge-domain { background: rgba(100,180,255,0.1); color: #64b4ff; }
.rt-badge-ip     { background: rgba(255,180,100,0.1); color: #ffb464; }
.rt-badge-process{ background: rgba(180,100,255,0.1); color: #b464ff; }
.rt-badge-rule-set{ background: rgba(100,255,180,0.1); color: #64ffb4; }
.rt-badge-match  { background: var(--gold-dim); color: var(--gold); }

.rt-info strong {
    display: block;
    font-size: 0.82rem;
    color: var(--text-200);
    margin-bottom: 3px;
    font-weight: 500;
}

.rt-info span {
    font-size: 0.78rem;
    color: var(--text-400);
    line-height: 1.4;
}

/* ==========================================================================
   Code window component
   ========================================================================== */
.code-window {
    background: var(--bg-panel);
    border: 1px solid var(--line-strong);
    overflow: hidden;
}

.code-win-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0.85rem 1.5rem;
    border-bottom: 1px solid var(--line-strong);
    background: var(--bg-surface);
}

.code-win-header span:not(.code-win-title) {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: block;
    background: var(--line-strong);
}

.code-win-header span:nth-child(1) { background: rgba(255,95,87,0.5); }
.code-win-header span:nth-child(2) { background: rgba(255,189,46,0.5); }
.code-win-header span:nth-child(3) { background: rgba(40,200,64,0.5); }

.code-win-title {
    margin-left: auto;
    font-family: var(--font-display);
    font-size: 0.65rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-400);
    background: none !important;
    width: auto !important;
    height: auto !important;
    border-radius: 0 !important;
    padding: 0 !important;
}

.code-win-body {
    padding: 1.75rem;
    font-family: 'Courier New', 'Menlo', 'Monaco', monospace;
    font-size: 0.8rem;
    line-height: 2;
    color: var(--text-300);
    overflow-x: auto;
    white-space: pre;
}

/* YAML syntax token colors */
.cy-key    { color: #64b4ff; }
.cy-string { color: #a8cc8c; }
.cy-number { color: #ffb464; }
.cy-bool   { color: #ff9580; }
.cy-comment{ color: var(--text-400); font-style: italic; }

/* Tip box */
.docs-tip-box {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    background: var(--bg-panel);
    border: 1px solid var(--line-strong);
    border-left: 3px solid var(--gold);
    padding: 1.25rem 1.5rem;
    margin-top: 1.5rem;
}

.docs-tip-box-warning { border-left-color: #ffb464; }
.docs-tip-box-warning .tip-icon { color: #ffb464; }

.tip-icon {
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.docs-tip-box p {
    font-size: 0.85rem;
    color: var(--text-400);
    line-height: 1.7;
    margin: 0;
}

.docs-tip-box strong { color: var(--text-200); }

/* ==========================================================================
   Protocol Table Section
   ========================================================================== */
.docs-protocols-section { background: var(--bg-base); }

.protocol-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    margin-bottom: 3rem;
}

.protocol-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    white-space: nowrap;
}

.protocol-table thead tr {
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line-strong);
}

.protocol-table th {
    padding: 1rem 1.25rem;
    text-align: left;
    font-family: var(--font-display);
    font-size: 0.68rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-400);
    font-weight: 400;
}

.protocol-table tbody tr {
    border-bottom: 1px solid var(--line);
    transition: background 0.2s ease;
}

.protocol-table tbody tr:hover { background: var(--bg-panel); }
.protocol-table tbody tr:last-child { border-bottom: none; }

.protocol-table td {
    padding: 0.9rem 1.25rem;
    color: var(--text-300);
    vertical-align: middle;
}

.proto-name { font-weight: 500; }

.proto-badge {
    display: inline-block;
    font-family: 'Courier New', monospace;
    font-size: 0.78rem;
    padding: 3px 10px;
    background: var(--bg-panel);
    border: 1px solid var(--line-strong);
    color: var(--text-200);
}

.proto-badge-vmess  { border-color: rgba(100,180,255,0.3); color: #64b4ff; background: rgba(100,180,255,0.06); }
.proto-badge-vless  { border-color: rgba(180,100,255,0.3); color: #b464ff; background: rgba(180,100,255,0.06); }
.proto-badge-trojan { border-color: rgba(100,255,180,0.3); color: #64ffb4; background: rgba(100,255,180,0.06); }
.proto-badge-hysteria { border-color: rgba(255,180,100,0.3); color: #ffb464; background: rgba(255,180,100,0.06); }
.proto-badge-tuic   { border-color: rgba(255,100,180,0.3); color: #ff64b4; background: rgba(255,100,180,0.06); }

.proto-cloak-label { font-size: 0.8rem; }
.proto-cloak { padding: 2px 8px; font-size: 0.72rem; }
.proto-basic    { color: var(--text-400); }
.proto-good     { color: #64b4ff; }
.proto-excellent { color: #64ffb4; }

.proto-support { font-size: 0.72rem; letter-spacing: 0.5px; }
.proto-all  { color: var(--text-300); }
.proto-meta { color: var(--gold); font-weight: 500; }

/* Protocol recommendation box */
.proto-recommend-box {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    background: var(--bg-panel);
    border: 1px solid var(--line-strong);
    border-top: 2px solid var(--gold);
    padding: 2rem;
}

.prb-icon {
    width: 40px;
    height: 40px;
    color: var(--gold);
    flex-shrink: 0;
    margin-top: 2px;
}

.prb-icon svg { width: 100%; height: 100%; }

.prb-title {
    font-size: 1rem;
    color: var(--text-100);
    font-weight: 500;
    margin-bottom: 0.6rem;
}

.prb-desc {
    font-size: 0.88rem;
    color: var(--text-400);
    line-height: 1.7;
}

.prb-desc strong { color: var(--gold); }

/* ==========================================================================
   YAML Config Section
   ========================================================================== */
.docs-yaml-section { background: var(--bg-surface); }

.yaml-ref-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 3vw;
    align-items: start;
}

.yaml-structure-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--line);
    position: sticky;
    top: calc(var(--nav-h) + 50px);
}

.yaml-struct-item {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 1rem;
    align-items: start;
    padding: 1.25rem 1.25rem;
    border-bottom: 1px solid var(--line);
    cursor: pointer;
    transition: background 0.2s ease;
    color: inherit;
}

.yaml-struct-item:last-child { border-bottom: none; }

.yaml-struct-item:hover,
.yaml-struct-item.active {
    background: var(--bg-panel);
}

.ysi-num {
    font-family: var(--font-display);
    font-size: 0.65rem;
    color: var(--gold);
    letter-spacing: 2px;
    margin-top: 2px;
}

.ysi-title {
    display: block;
    font-size: 0.85rem;
    color: var(--text-200);
    margin-bottom: 4px;
    font-weight: 500;
}

.ysi-desc {
    display: block;
    font-size: 0.75rem;
    color: var(--text-400);
    line-height: 1.5;
}

.yaml-code-area {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    min-width: 0;
}

.yaml-code-block { scroll-margin-top: calc(var(--nav-h) + 60px); }

/* ==========================================================================
   Proxy Groups Section
   ========================================================================== */
.groups-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 4rem;
}

.group-card {
    background: var(--bg-surface);
    border: 1px solid var(--line);
    padding: 2.5rem;
    transition: border-color 0.3s ease;
}

.group-card:hover { border-color: var(--line-strong); }

.group-card-highlight {
    border-color: rgba(179,155,117,0.3);
    background: rgba(179,155,117,0.03);
}

.gc-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.gc-type-badge {
    font-family: 'Courier New', monospace;
    font-size: 0.72rem;
    padding: 4px 10px;
    letter-spacing: 0.5px;
}

.gc-select   { background: rgba(100,180,255,0.12); color: #64b4ff; }
.gc-urltest  { background: var(--gold-dim); color: var(--gold); }
.gc-fallback { background: rgba(100,255,180,0.12); color: #64ffb4; }
.gc-lb       { background: rgba(255,100,180,0.12); color: #ff64b4; }

.gc-label {
    font-family: var(--font-display);
    font-size: 0.68rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-400);
}

.gc-title {
    font-size: 1.1rem;
    color: var(--text-100);
    font-weight: 500;
    margin-bottom: 1rem;
}

.gc-desc {
    font-size: 0.88rem;
    color: var(--text-400);
    line-height: 1.75;
    margin-bottom: 1.5rem;
}

.gc-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.gc-features li {
    font-size: 0.82rem;
    color: var(--text-400);
    padding-left: 1rem;
    position: relative;
}

.gc-features li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--gold);
    font-size: 0.7rem;
}

/* ==========================================================================
   DNS & Fake-IP Section
   ========================================================================== */
.docs-dns-section { background: var(--bg-base); }

.dns-compare {
    margin-top: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.dns-compare-item {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    padding: 1.25rem 1.5rem;
}

.dns-bad  { border-left: 3px solid #ff6464; }
.dns-good { border-left: 3px solid #64ffb4; }

.dns-compare-label {
    font-family: var(--font-display);
    font-size: 0.68rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-400);
    margin-bottom: 1rem;
}

.dns-flow {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.dns-step {
    font-size: 0.78rem;
    color: var(--text-300);
    text-align: center;
    padding: 6px 12px;
    background: var(--bg-surface);
    border: 1px solid var(--line-strong);
    line-height: 1.4;
}

.dns-step small {
    display: block;
    font-size: 0.65rem;
    color: var(--text-400);
}

.dns-step-bad  { border-color: rgba(255,100,100,0.3); color: #ff9999; }
.dns-step-good { border-color: rgba(100,255,180,0.25); color: #64ffb4; }

.dns-arrow {
    color: var(--text-400);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* DNS modes list */
.dns-modes-list {
    display: flex;
    flex-direction: column;
    gap: 0;
    border: 1px solid var(--line);
    margin-bottom: 1.5rem;
}

.dns-mode-item {
    padding: 1.5rem;
    border-bottom: 1px solid var(--line);
    transition: background 0.2s ease;
}

.dns-mode-item:last-child { border-bottom: none; }

.dns-mode-active {
    background: var(--bg-panel);
    border-left: 3px solid var(--gold);
}

.dns-mode-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.dns-mode-name {
    font-family: 'Courier New', monospace;
    font-size: 0.88rem;
    color: var(--text-200);
}

.dns-mode-badge {
    font-family: var(--font-display);
    font-size: 0.62rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    padding: 3px 10px;
    background: var(--gold-dim);
    color: var(--gold);
}

.dns-mode-badge-alt {
    background: rgba(255,255,255,0.04);
    color: var(--text-400);
}

.dns-mode-desc {
    font-size: 0.82rem;
    color: var(--text-400);
    line-height: 1.6;
}

/* ==========================================================================
   RESTful API Section
   ========================================================================== */
.docs-api-section { background: var(--bg-surface); }

.api-endpoints-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.api-endpoint-group {
    background: var(--bg-panel);
    border: 1px solid var(--line);
    overflow: hidden;
}

.aeg-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--line-strong);
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-300);
}

.aeg-method {
    font-family: 'Courier New', monospace;
    font-size: 0.65rem;
    padding: 2px 8px;
    letter-spacing: 1px;
}

.aeg-get { background: rgba(100,180,255,0.12); color: #64b4ff; }
.aeg-put { background: rgba(255,180,100,0.12); color: #ffb464; }

.api-ep-list {
    padding: 0.5rem 0;
}

.api-ep {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 1rem;
    align-items: baseline;
    padding: 0.75rem 1.5rem;
    border-bottom: 1px solid var(--line);
}

.api-ep:last-child { border-bottom: none; }

.ep-path {
    font-family: 'Courier New', 'Menlo', monospace;
    font-size: 0.75rem;
    color: var(--gold);
    white-space: nowrap;
}

.ep-desc {
    font-size: 0.78rem;
    color: var(--text-400);
    line-height: 1.5;
}

/* Panels showcase */
.api-panels-showcase {
    border: 1px solid var(--line);
    overflow: hidden;
}

.aps-title {
    padding: 1rem 2rem;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line);
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--text-400);
}

.aps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
}

.aps-panel {
    padding: 2rem;
    border-right: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.aps-panel:last-child { border-right: none; }

.aps-name {
    font-family: var(--font-display);
    font-size: 1.25rem;
    letter-spacing: 2px;
    color: var(--text-100);
    text-transform: uppercase;
}

.aps-desc {
    font-size: 0.82rem;
    color: var(--text-400);
    line-height: 1.6;
    flex: 1;
}

.aps-link {
    font-family: var(--font-display);
    font-size: 0.68rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gold);
    transition: opacity 0.2s;
}

.aps-link:hover { opacity: 0.7; }

/* ==========================================================================
   Performance Section
   ========================================================================== */
.docs-perf-section { background: var(--bg-base); }

.perf-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    border: 1px solid var(--line);
    margin-bottom: 4rem;
}

.perf-stat {
    padding: 3.5rem 2rem;
    text-align: center;
    border-right: 1px solid var(--line);
}

.perf-stat:last-child { border-right: none; }

.ps-number {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 300;
    color: var(--text-100);
    line-height: 1;
    margin-bottom: 1rem;
}

.ps-number span {
    font-size: 1.5rem;
    color: var(--text-400);
    margin-left: 2px;
}

.ps-gold { color: var(--gold); }

.ps-label {
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gold);
    margin-bottom: 0.75rem;
}

.ps-sub {
    font-size: 0.78rem;
    color: var(--text-400);
    line-height: 1.5;
}

.perf-features-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border: 1px solid var(--line);
}

.pfl-item {
    padding: 2.5rem;
    border-bottom: 1px solid var(--line);
    border-right: 1px solid var(--line);
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: 1.75rem;
    align-items: start;
}

.pfl-item:nth-child(even) { border-right: none; }
.pfl-item:nth-last-child(-n+2) { border-bottom: none; }

.pfl-icon {
    width: 44px;
    height: 44px;
    color: var(--gold);
    flex-shrink: 0;
}

.pfl-icon svg { width: 100%; height: 100%; }

.pfl-title {
    font-size: 1rem;
    color: var(--text-100);
    font-weight: 500;
    margin-bottom: 0.6rem;
}

.pfl-desc {
    font-size: 0.85rem;
    color: var(--text-400);
    line-height: 1.7;
}

/* ==========================================================================
   Quick Start Section
   ========================================================================== */
.docs-quickstart-section { background: var(--bg-surface); }

.qs-steps {
    margin-top: 5rem;
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.qs-steps::before {
    content: '';
    position: absolute;
    left: 2.25rem;
    top: 6.5rem;
    bottom: 6.5rem;
    width: 1px;
    background: linear-gradient(to bottom, var(--gold-dim), var(--gold) 30%, var(--gold) 70%, var(--gold-dim));
}

.qs-step {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: 3rem;
    padding: 2.5rem 0;
    border-bottom: 1px solid var(--line);
    position: relative;
    align-items: start;
}

.qs-step:last-child { border-bottom: none; }

.qs-step-num {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 300;
    color: transparent;
    -webkit-text-stroke: 1px rgba(179,155,117,0.3);
    line-height: 1;
    text-align: center;
    position: relative;
    z-index: 1;
}

.qs-step::before {
    content: '';
    position: absolute;
    left: calc(80px / 2 - 6px);
    top: 6.5rem;
    width: 12px;
    height: 12px;
    background: var(--gold);
    border-radius: 50%;
    z-index: 2;
}

.qs-step-title {
    font-size: 1.2rem;
    color: var(--text-100);
    font-weight: 500;
    margin-bottom: 0.85rem;
    margin-top: 6.5rem;
}

.qs-step-desc {
    font-size: 0.9rem;
    color: var(--text-400);
    line-height: 1.8;
    margin-bottom: 0.75rem;
}

.qs-step-link {
    font-family: var(--font-display);
    font-size: 0.72rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--gold);
}

.qs-cta {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 5rem;
    flex-wrap: wrap;
}

/* ==========================================================================
   FAQ Section
   ========================================================================== */
.docs-faq-section { background: var(--bg-base); }

.docs-faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border: 1px solid var(--line);
    margin-top: 2rem;
}

.docs-faq-item {
    padding: 2.5rem;
    border-bottom: 1px solid var(--line);
    border-right: 1px solid var(--line);
}

.docs-faq-item:nth-child(even) { border-right: none; }
.docs-faq-item:nth-last-child(-n+2) { border-bottom: none; }

.docs-faq-item .faq-q {
    font-size: 1rem;
    color: var(--text-100);
    font-weight: 500;
    margin-bottom: 1rem;
    line-height: 1.5;
}

.docs-faq-item .faq-a {
    font-size: 0.88rem;
    color: var(--text-400);
    line-height: 1.8;
}

.docs-faq-item .faq-a strong { color: var(--text-200); }

.docs-inline-link {
    color: var(--gold);
    text-decoration: underline;
    text-underline-offset: 2px;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1200px) {
    .docs-hero-inner { grid-template-columns: 1fr; min-height: auto; }
    .docs-hero-diagram { display: none; }
    .yaml-ref-grid { grid-template-columns: 1fr; }
    .yaml-structure-list { position: static; display: grid; grid-template-columns: repeat(3, 1fr); }
    .perf-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .perf-stat:nth-child(2) { border-right: none; }
    .perf-stat { border-bottom: 1px solid var(--line); }
    .perf-stat:nth-last-child(-n+2) { border-bottom: none; }
}

@media (max-width: 1024px) {
    .features-hex-grid { grid-template-columns: repeat(2, 1fr); }
    .docs-two-col { grid-template-columns: 1fr; }
    .groups-grid { grid-template-columns: 1fr; }
    .api-endpoints-grid { grid-template-columns: 1fr; }
    .aps-grid { grid-template-columns: 1fr; }
    .aps-panel { border-right: none; border-bottom: 1px solid var(--line); }
    .aps-panel:last-child { border-bottom: none; }
    .docs-faq-grid { grid-template-columns: 1fr; }
    .docs-faq-item { border-right: none; }
    .docs-faq-item:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
    .docs-faq-item:last-child { border-bottom: none; }
    .rule-types-grid { grid-template-columns: 1fr; }
    .rule-type-item { border-right: none; }
    .rule-type-item:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
    .rule-type-item:last-child { border-bottom: none; }
    .perf-features-list { grid-template-columns: 1fr; }
    .pfl-item { border-right: none; border-bottom: 1px solid var(--line); }
    .pfl-item:last-child { border-bottom: none; }
}

@media (max-width: 768px) {
    /* Hero */
    .docs-hero-inner { grid-template-columns: 1fr; padding-top: 8vw; padding-bottom: 8vw; }
    .docs-hero-title { font-size: clamp(2.2rem, 8vw, 3rem); }
    .docs-hero-actions { gap: 1rem; }
    .docs-hero-actions .btn { width: 100%; text-align: center; }

    /* Anchor nav — ensure min tap-target height */
    .docs-anchor-nav { top: 0; }
    .docs-anchor-list a { padding: 0.9rem 1.1rem; min-height: 44px; font-size: 0.65rem; }

    /* Section spacing */
    .docs-section { padding: 12vw 0; }
    .docs-section-title { font-size: clamp(2rem, 7vw, 2.8rem); margin-bottom: 1.25rem; }
    .docs-section-desc { margin-bottom: 3rem; }

    /* Core feature cards */
    .features-hex-grid { grid-template-columns: 1fr; }
    .fhex-card { padding: 2rem 1.5rem; }

    /* Rule engine */
    .rule-type-item { padding: 1rem 1.25rem; }

    /* Code windows */
    .code-win-body { padding: 1.25rem 1rem; font-size: 0.75rem; }
    .code-win-header { padding: 0.75rem 1rem; }
    .docs-tip-box { padding: 1rem 1.25rem; }

    /* YAML section */
    .yaml-structure-list { grid-template-columns: 1fr; }
    .yaml-struct-item { padding: 1rem; }
    .yaml-ref-grid { overflow: hidden; }
    .yaml-code-area { min-width: 0; overflow: hidden; }
    .code-window { max-width: 100%; overflow: hidden; }
    .code-win-body { overflow-x: auto; -webkit-overflow-scrolling: touch; }

    /* Proxy groups */
    .groups-grid { grid-template-columns: 1fr; }
    .group-card { padding: 1.75rem; }

    /* Performance */
    .perf-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .perf-stat { padding: 2.5rem 1.25rem; }
    .ps-number { font-size: 2.8rem; }
    .pfl-item { padding: 1.75rem; }

    /* API section */
    .api-ep { grid-template-columns: 1fr; gap: 0.4rem; }
    .ep-path { white-space: normal; }

    /* Quickstart steps */
    .qs-steps { margin-top: 3rem; }
    .qs-steps::before { display: none; }
    .qs-step { grid-template-columns: 1fr; gap: 0.5rem; padding: 2rem 0; }
    .qs-step::before { display: none; }
    .qs-step-num { font-size: 2rem; text-align: left; -webkit-text-stroke-color: rgba(179,155,117,0.5); }
    .qs-cta { margin-top: 3rem; gap: 1rem; }
    .qs-cta .btn { width: 100%; text-align: center; }

    /* Protocol section */
    .proto-recommend-box { flex-direction: column; gap: 1rem; padding: 1.5rem; }
    .proto-recommend-box .prb-icon { width: 32px; height: 32px; }

    /* FAQ */
    .docs-faq-grid { grid-template-columns: 1fr; }
    .docs-faq-item { padding: 1.75rem; border-right: none; }
    .docs-faq-item:nth-last-child(-n+2) { border-bottom: 1px solid var(--line); }
    .docs-faq-item:last-child { border-bottom: none; }

    /* Perf stats single-col at 768 */
    .perf-stats-grid { grid-template-columns: 1fr; }
    .perf-stat { border-right: none; border-bottom: 1px solid var(--line); }
    .perf-stat:last-child { border-bottom: none; }
}

/* ==========================================================================
   Extra small screens (≤ 480px)
   ========================================================================== */
@media (max-width: 480px) {
    /* Hero */
    .docs-hero-title { font-size: clamp(2rem, 9vw, 2.4rem); }
    .docs-hero-inner { gap: 2rem; }
    .docs-hero-actions .btn { padding: 0.85rem 1.5rem; font-size: 0.8rem; }

    /* Anchor nav */
    .docs-anchor-list a { padding: 0.8rem 0.85rem; font-size: 0.6rem; letter-spacing: 1.5px; }

    /* Section titles */
    .docs-section-title { font-size: clamp(1.75rem, 8vw, 2.2rem); }
    .docs-section { padding: 14vw 0; }

    /* Feature cards */
    .fhex-card { padding: 1.5rem 1.25rem; }
    .fhex-icon { width: 36px; height: 36px; margin-bottom: 1.25rem; }
    .fhex-title { font-size: 1rem; }
    .fhex-desc { font-size: 0.85rem; }

    /* Code windows */
    .code-win-body { padding: 1rem 0.85rem; font-size: 0.72rem; line-height: 1.8; }
    .code-win-header { padding: 0.65rem 0.85rem; }
    .code-win-title { font-size: 0.58rem; letter-spacing: 1px; }

    /* Rule type items */
    .rule-type-item { padding: 0.85rem 1rem; gap: 0.75rem; flex-wrap: wrap; }
    .rt-badge { font-size: 0.58rem; }
    .rt-info strong { font-size: 0.78rem; }
    .rt-info span { font-size: 0.72rem; }

    /* YAML sidebar items */
    .yaml-struct-item { padding: 0.85rem; gap: 0.75rem; }
    .yaml-code-area { min-width: 0; overflow: hidden; }
    .code-win-body { font-size: 0.7rem; }
    .ysi-num { font-size: 0.6rem; }
    .ysi-title { font-size: 0.78rem; }
    .ysi-desc { font-size: 0.68rem; }

    /* Proxy group cards */
    .group-card { padding: 1.5rem 1.25rem; }
    .gc-title { font-size: 1rem; }
    .gc-desc { font-size: 0.85rem; }

    /* DNS compare flow — stack vertically */
    .dns-flow { flex-direction: column; align-items: flex-start; }
    .dns-arrow { transform: rotate(90deg); align-self: center; }
    .dns-step { width: 100%; text-align: left; }

    /* Performance numbers */
    .perf-stat { padding: 2rem 1rem; }
    .ps-number { font-size: 2.4rem; }
    .pfl-item { padding: 1.5rem 1.25rem; gap: 1.25rem; }
    .pfl-item .pfl-icon { width: 36px; height: 36px; }

    /* API endpoints */
    .aeg-title { font-size: 0.65rem; padding: 0.85rem 1rem; }
    .api-ep { padding: 0.65rem 1rem; }
    .ep-path { font-size: 0.68rem; }
    .ep-desc { font-size: 0.72rem; }

    /* Panels showcase */
    .aps-title { font-size: 0.65rem; padding: 0.85rem 1.25rem; }
    .aps-panel { padding: 1.5rem 1.25rem; }
    .aps-name { font-size: 1rem; }

    /* Quick start */
    .qs-step { padding: 1.5rem 0; }
    .qs-step-num { font-size: 1.75rem; }
    .qs-step-title { font-size: 1.05rem; }
    .qs-step-desc { font-size: 0.85rem; }

    /* FAQ */
    .docs-faq-item { padding: 1.5rem 1.25rem; }
    .docs-faq-item .faq-q { font-size: 0.95rem; }
    .docs-faq-item .faq-a { font-size: 0.82rem; }

    /* Tip boxes */
    .docs-tip-box { padding: 0.85rem 1rem; gap: 0.75rem; }
    .docs-tip-box p { font-size: 0.8rem; }

    /* Protocol recommend box */
    .proto-recommend-box { padding: 1.25rem; }
    .prb-title { font-size: 0.95rem; }
    .prb-desc { font-size: 0.82rem; }

    /* Inline code */
    .inline-code { font-size: 0.8em; padding: 1px 5px; }
}