/* AI Mỗi Ngày — components web, phong cách đài quan sát. Chỉ dùng biến trong tokens.css. */
/* Copied from docs/web/design-source/components.css (C-078); only the canvas scaffolding (state board, .is-hover/.is-focus/.is-press) is left out. */

/* ---------- Nền tảng ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--void); color: var(--ice); font-family: var(--font); font-size: var(--fs-body); line-height: var(--lh-body); }
.page { background: var(--void); color: var(--ice); font-family: var(--font); font-weight: 400; font-size: var(--fs-body); line-height: var(--lh-body); font-feature-settings: "ss01" on, "ss02" on; overflow-x: clip; min-width: 0; }
.page h1, .page h2, .page h3, .page p, .page ul, .page ol, .page figure { margin: 0; }
.page h1, .page h2, .page h3 { font-weight: 400; }
.page a { color: var(--ice); text-decoration: underline; text-decoration-color: var(--line-strong); text-decoration-thickness: 1px; text-underline-offset: 4px; transition: text-decoration-color .2s ease; }
.page a:hover { text-decoration-color: var(--ice); }
.page :focus-visible { outline: 1px solid var(--line-full); outline-offset: 3px; }
.page strong { color: var(--ice); font-weight: 600; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--sp-6); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.skip-link { position: absolute; left: var(--sp-4); top: -60px; z-index: 50; padding: 8px 12px; border-radius: var(--r-btn); background: var(--carbon); border: 1px solid var(--line-full); text-decoration: none !important; font: 400 var(--fs-label)/1 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; }
.skip-link:focus { top: 12px; }

/* ---------- Icon ---------- */
.icon { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.icon-16 { width: 16px; height: 16px; }
.icon-14 { width: 14px; height: 14px; }

/* ---------- Chữ ---------- */
.label { display: inline-flex; align-items: center; gap: var(--sp-2); font: 400 var(--fs-label)/1.2 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-2); }
.label-index { color: var(--ice); }
.hl { color: var(--cobalt); }
.code-inline { font-family: var(--font-mono); font-size: 0.86em; background: var(--slate); color: var(--ice); padding: 1px 6px; border-radius: 4px; overflow-wrap: anywhere; }
.kbd { font-family: var(--font-mono); font-size: 0.82em; padding: 1px 6px; border: 1px solid var(--line-strong); border-radius: 4px; color: var(--ice); white-space: nowrap; }
.meta { font: 400 var(--fs-label)/1.5 var(--font-mono); letter-spacing: var(--track-ui); color: var(--text-3); }

/* Khung "ống ngắm": viền sáng + 4 chấm coban ở góc */
.frame { position: relative; border: 1px solid var(--line-strong); border-radius: var(--r-btn);
  background:
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) left -5px top -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) right -5px top -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) left -5px bottom -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) right -5px bottom -5px / 10px 10px no-repeat;
}

/* ---------- Nút — tất cả dạng viền, không tô đặc ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-3); min-height: 48px; padding: 0 var(--sp-5); border-radius: var(--r-btn); border: 1px solid var(--line-strong); background: transparent; color: var(--ice) !important; font: 400 14px/1.2 var(--font); letter-spacing: var(--track-ui); text-transform: uppercase; text-decoration: none !important; white-space: nowrap; cursor: pointer; transition: background-color .2s ease, border-color .2s ease, color .2s ease; }
.btn-sm { min-height: 40px; padding: 0 var(--sp-4); font-size: 12px; }
.btn-primary { border-color: var(--orange); color: var(--orange) !important; }
.btn-primary:hover { background: var(--orange-wash); }
.btn-primary:active { background: var(--orange); color: var(--void) !important; }
.btn-secondary:hover { border-color: var(--ice); background: rgba(216, 234, 255, 0.06); }
.btn-secondary:active { background: rgba(216, 234, 255, 0.12); }
.btn-ghost { min-height: 32px; padding: 0 var(--sp-3); border-color: transparent; color: var(--text-2) !important; font: 400 11px/1 var(--font-mono); letter-spacing: var(--track-label); }
.btn-ghost:hover { color: var(--ice) !important; border-color: var(--line); }
.btn-ghost:active { background: rgba(216, 234, 255, 0.08); }
.btn-pending { border-style: dashed; border-color: var(--line); color: var(--text-3) !important; cursor: not-allowed; }

/* ---------- Nhãn ---------- */
.pill { display: inline-flex; align-items: center; gap: var(--sp-2); height: 26px; padding: 0 10px; border-radius: var(--r-tag); border: 1px solid var(--line-strong); font: 400 11px/1 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; white-space: nowrap; color: var(--ice); }
.pill::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--cobalt); flex: none; }
.pill-offline::before { background: var(--fog); }
.pill-connected::before { background: var(--cobalt); }

/* ---------- Thẻ ---------- */
.card { background: var(--carbon); border: 1px solid var(--line); border-radius: var(--r-card); padding: var(--sp-6); }
.card-warning { padding: var(--sp-4) var(--sp-5); color: var(--text-2); border: 1px solid var(--line-strong); border-radius: var(--r-btn);
  background:
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) left -5px top -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) right -5px top -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) left -5px bottom -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) right -5px bottom -5px / 10px 10px no-repeat,
    var(--carbon);
}
.card-warning-title { display: flex; align-items: center; gap: var(--sp-2); font: 400 var(--fs-label)/1.3 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--ice); }
.card-warning-title + p { margin-top: 6px; }

/* ---------- Khối lệnh ---------- */
.codeblock { display: flex; align-items: center; gap: var(--sp-2); min-width: 0; background: var(--carbon); border: 1px solid var(--line); border-radius: var(--r-btn); padding: 4px 4px 4px var(--sp-4); }
.codeblock code { flex: 1 1 auto; min-width: 0; overflow-x: auto; white-space: pre; padding: 9px 0; font: var(--fs-code)/1.45 var(--font-mono); color: var(--ice); scrollbar-width: thin; }
.codeblock code::before { content: "$ "; color: var(--fog); }
.copy-btn { flex: none; }
.copy-btn.is-done { color: var(--ice) !important; border-color: var(--line-strong); }

/* ---------- Bước ---------- */
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.step { position: relative; display: grid; grid-template-columns: 40px minmax(0, 1fr); column-gap: var(--sp-5); padding-bottom: var(--sp-7); scroll-margin-top: 110px; }
.step::before { content: ""; position: absolute; left: 19px; top: 40px; bottom: 8px; width: 1px; background: var(--line); }
.step:last-child { padding-bottom: 0; }
.step:last-child::before { display: none; }
.step-num { width: 40px; height: 32px; border: 1px solid var(--line-strong); border-radius: var(--r-btn); display: grid; place-items: center; font: 400 12px/1 var(--font-mono); letter-spacing: var(--track-ui); color: var(--ice); }
.step-title { font-size: var(--fs-heading-sm); line-height: 1.24; letter-spacing: var(--track-heading); padding-top: 2px; }
.step-body { grid-column: 2; margin-top: var(--sp-2); color: var(--text-2); }
.step-body > * + * { margin-top: var(--sp-3); }

/* ---------- Thanh trên ---------- */
.topbar { position: sticky; top: 0; z-index: 30; background: var(--void); border-bottom: 1px solid var(--line); }
.topbar-inner { max-width: var(--wrap); height: var(--topbar-h); margin: 0 auto; padding: 0 var(--sp-6); display: flex; align-items: center; gap: var(--sp-5); }
.brand { display: flex; align-items: center; gap: var(--sp-3); min-width: 0; }
.wordmark { color: var(--ice) !important; text-decoration: none !important; font-size: 18px; letter-spacing: var(--track-heading); white-space: nowrap; }
.topnav { margin-left: auto; display: flex; align-items: center; gap: var(--sp-6); }
.topnav-link { display: inline-flex; align-items: center; gap: var(--sp-2); min-height: 44px; color: var(--ice) !important; text-decoration: none !important; font: 400 var(--fs-label)/1 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; white-space: nowrap; }
.topnav-link .icon { display: none; }
.topnav-link:hover { color: var(--text-2) !important; }
.topnav-link[aria-current="page"] { color: var(--orange) !important; }
.topnav-link[aria-current="page"]::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--orange); }
.topbar-cta { margin-left: var(--sp-2); }
.label-short { display: none; }

/* ---------- Section kiểu tạp chí ---------- */
.section { padding: var(--sp-9) 0; border-top: 1px solid var(--line); }
.section-head { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: var(--sp-5); align-items: baseline; margin-bottom: var(--sp-8); }
.section-head h2, .doc h2 { font-size: var(--fs-heading); line-height: 1.06; letter-spacing: var(--track-heading); text-wrap: balance; }
.section-lead { grid-column: 2; margin-top: var(--sp-4) !important; max-width: 600px; color: var(--text-2); font-size: var(--fs-lead); line-height: 1.5; }

/* ---------- Hero + đám hạt ---------- */
.hero { position: relative; overflow: hidden; padding: var(--sp-8) 0 var(--sp-9); background: var(--carbon); border-bottom: 1px solid var(--line); }
.particles { position: absolute; inset: 0; pointer-events: none; }
.particle { position: absolute; border-radius: 50%; background: var(--cobalt); }
.hero-inner { position: relative; }
.hero h1 { margin-top: var(--sp-6); max-width: 13ch; font-size: var(--fs-display); line-height: 1; letter-spacing: var(--track-display); }
.hero-grid { margin-top: var(--sp-8); display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: var(--sp-8); align-items: end; }
.hero-lead { max-width: 560px; color: var(--text-2); font-size: var(--fs-lead); line-height: 1.5; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--sp-3); margin-top: var(--sp-6); }
.download-meta { margin-top: var(--sp-4) !important; font: 400 var(--fs-label)/1.6 var(--font-mono); letter-spacing: var(--track-ui); color: var(--text-3); }
.download-meta code { font: inherit; color: var(--text-2); }
.hero-visual { width: 100%; max-width: 380px; justify-self: end; padding: var(--sp-3); }

/* ---------- Bước ngang (trang 1) ---------- */
.steps-row { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--line); }
.steps-row .step { grid-template-columns: minmax(0, 1fr); row-gap: var(--sp-4); padding: var(--sp-6) var(--sp-6) 0 0; }
.steps-row .step + .step { padding-left: var(--sp-6); border-left: 1px solid var(--line); }
.steps-row .step::before { display: none; }
.steps-row .step-body { grid-column: 1; margin-top: 0; }

/* ---------- Tính năng ---------- */
.grid-3 { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--sp-6); }
.feature { display: flex; flex-direction: column; gap: var(--sp-4); min-height: 280px; transition: border-color .2s ease; }
.feature:hover { border-color: var(--line-strong); }
.feature-top { display: flex; align-items: center; justify-content: space-between; color: var(--text-2); }
.feature h3, .trust-item h3 { font-size: var(--fs-heading-sm); line-height: 1.24; letter-spacing: var(--track-heading); }
.feature p, .trust-item p { color: var(--text-2); font-size: var(--fs-small); }
.feature h3 { margin-top: auto !important; }
.ai-list { display: flex; flex-wrap: wrap; gap: var(--sp-2) var(--sp-4); font: 400 11px/1.4 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-2); }
.ai-tag { display: inline-flex; align-items: center; gap: 6px; }
.ai-dot { width: 8px; height: 8px; border-radius: 50%; flex: none; display: inline-block; }
.ai-dot-claude { background: var(--ai-claude); }
.ai-dot-gpt { background: var(--ai-gpt); }
.ai-dot-gemini { background: var(--ai-gemini); }

/* Thẻ hỏi xoá thu nhỏ — chụp từ app nên giữ hệ tối của app */
.confirm-mini { background: var(--app-warning-tint); border: 1px solid var(--app-warning); border-radius: 10px; padding: var(--sp-3); font: 13px/1.45 "Segoe UI", system-ui, sans-serif; color: var(--app-warning-text); display: flex; flex-direction: column; gap: 10px; }
.confirm-mini-actions { display: flex; gap: var(--sp-2); }
.mini-btn { display: inline-flex; align-items: center; height: 26px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--app-border-strong); color: var(--app-text); font-weight: 600; font-size: 12px; }
.mini-btn-danger { border-color: transparent; background: var(--app-error-tint); color: var(--app-error); }

/* ---------- Tài khoản AI ---------- */
.trust { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.trust-item { display: flex; flex-direction: column; gap: var(--sp-4); padding: var(--sp-6) var(--sp-6) 0 0; }
.trust-item + .trust-item { padding-left: var(--sp-6); border-left: 1px solid var(--line); }
.trust-item .card-warning { margin-top: var(--sp-2); font-size: 14px; }

/* ---------- Máy cần có + Zalo ---------- */
.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-6); }
.req-list { list-style: none; margin: var(--sp-5) 0 0; padding: 0; border-top: 1px solid var(--line); }
.req-item { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: var(--sp-4); padding: var(--sp-4) 0; border-bottom: 1px solid var(--line); font-size: var(--fs-small); }
.req-item .label { color: var(--text-3); }
.req-note { margin-top: var(--sp-4) !important; color: var(--text-3); font: 400 var(--fs-label)/1.6 var(--font-mono); letter-spacing: var(--track-ui); }
.community { display: flex; flex-direction: column; align-items: flex-start; gap: var(--sp-5); }
.community-icon { width: 48px; height: 48px; border: 1px solid var(--line-strong); border-radius: var(--r-btn); display: grid; place-items: center; color: var(--ice); flex: none; }
.community-text { min-width: 0; }
.community-text h2, .community-text h3 { font-size: 32px; line-height: 1.15; letter-spacing: var(--track-heading); }
.community-text p { margin-top: var(--sp-3) !important; color: var(--text-2); }
.community-row { flex-direction: row; align-items: center; flex-wrap: wrap; }
.community-row .community-text { flex: 1 1 360px; }
.split .card h2 { font-size: 32px; line-height: 1.15; letter-spacing: var(--track-heading); }

/* ---------- Accordion ---------- */
.faq { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-btn { width: 100%; min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: var(--sp-5); padding: var(--sp-5) 0; background: transparent; border: 0; color: var(--ice); font: 400 var(--fs-heading-sm)/1.24 var(--font); letter-spacing: var(--track-heading); text-align: left; cursor: pointer; transition: color .2s ease; }
.faq-btn:hover { color: var(--text-2); }
.faq-btn .icon { width: 24px; height: 24px; color: var(--ice); transition: transform .2s ease; }
.faq-btn[aria-expanded="true"] .icon { transform: rotate(180deg); }
.faq-a { padding: 0 0 var(--sp-6); color: var(--text-2); max-width: 64ch; font-size: 17px; }
.faq-a > * + * { margin-top: var(--sp-2); }
.faq-sm .faq-btn { font-size: 18px; min-height: 60px; padding: var(--sp-4) 0; }
.faq-sm .faq-a { font-size: var(--fs-body); }

/* ---------- CTA cuối ---------- */
.cta { text-align: center; }
.cta h2 { margin-top: var(--sp-5) !important; font-size: var(--fs-display); line-height: 1; letter-spacing: var(--track-display); text-wrap: balance; }
.cta .hero-actions { justify-content: center; margin-top: var(--sp-7); }
.cta-links { margin-top: var(--sp-5) !important; display: flex; justify-content: center; flex-wrap: wrap; gap: var(--sp-2) var(--sp-6); font: 400 var(--fs-label)/1.4 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; }

/* ---------- Chân trang ---------- */
.footer { background: var(--void); border-top: 1px solid var(--line); padding: var(--sp-7) 0 var(--sp-8); color: var(--text-2); }
.footer-row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-4) var(--sp-6); font: 400 var(--fs-label)/1.4 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; }
.footer-brand { color: var(--ice); }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--sp-3) var(--sp-6); }
.footer-links a[href^="mailto"] { text-transform: none; letter-spacing: var(--track-ui); }
.footer-legal { margin-top: var(--sp-6) !important; max-width: 90ch; color: var(--text-3); font-size: 13px; line-height: 1.6; }

/* ---------- Ảnh minh hoạ khung chat (hệ tối của app thật) ---------- */
.dock-shot { width: 100%; max-width: 356px; height: 600px; margin: 0 auto; display: flex; flex-direction: column; overflow: hidden; background: var(--app-bg); border: 1px solid var(--app-border); border-radius: 14px; color: var(--app-text); font-family: "Segoe UI", system-ui, sans-serif; font-size: 13px; line-height: 1.45; letter-spacing: 0; text-align: left; text-transform: none; }
.dock-shot-sm { height: auto; max-width: 340px; }
.dock-head { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; padding: 10px; border-bottom: 1px solid var(--app-divider); }
.dock-ai { display: inline-flex; align-items: center; gap: 6px; height: 28px; padding: 0 6px; border-radius: 8px; font-weight: 600; }
.dock-ai .icon { color: var(--app-text-3); }
.dock-pill { display: inline-flex; align-items: center; gap: 6px; height: 24px; padding: 0 9px; border-radius: 999px; font-size: 12px; font-weight: 600; white-space: nowrap; color: var(--app-success); background: var(--app-success-tint); }
.dock-pill::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: currentColor; }
.dock-spacer { flex: 1; }
.dock-icon { width: 28px; height: 28px; display: grid; place-items: center; border-radius: 8px; color: var(--app-text-2); }
.dock-icon .icon, .dock-send .icon, .dock-step .icon { stroke-width: 2; }
.dock-body { flex: 1; display: flex; flex-direction: column; gap: 14px; padding: 16px 14px; overflow: hidden; }
.bubble-user { align-self: flex-end; max-width: 86%; background: var(--app-bubble); border-radius: 16px 16px 4px 16px; padding: 10px 14px; }
.dock-steps { list-style: none; margin: 0; padding: 6px; display: flex; flex-direction: column; gap: 2px; background: var(--app-bg-deep); border: 1px solid var(--app-divider); border-radius: 12px; }
.dock-step { display: flex; align-items: center; gap: 8px; padding: 7px 8px; border-radius: 8px; color: var(--app-text-2); }
.dock-step .is-check { color: var(--app-success); }
.dock-step .is-code { margin-left: auto; color: var(--app-text-3); }
.dock-reply { color: var(--app-text); }
.dock-summary { display: flex; align-items: center; justify-content: space-between; gap: 8px; color: var(--app-text-3); font-size: 12px; }
.dock-chip { display: inline-flex; align-items: center; height: 28px; padding: 0 12px; border-radius: 999px; border: 1px solid var(--app-border-strong); color: var(--app-text); font-weight: 600; font-size: 12px; }
.dock-input { margin: 0 12px 12px; padding: 10px 10px 10px 14px; display: flex; flex-direction: column; gap: 8px; background: var(--app-bg-deep); border: 1px solid var(--app-input-border); border-radius: 18px; }
.dock-input-text { min-height: 36px; color: var(--app-text-3); }
.dock-input-row { display: flex; align-items: center; justify-content: space-between; }
.dock-send { width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center; background: var(--app-accent); color: var(--app-on-accent); }
.shot-caption { margin-top: var(--sp-3) !important; text-align: center; }

/* ---------- Trang tài liệu (Hướng dẫn cài) ---------- */
.desk { max-width: var(--wrap); margin: 0 auto; padding: var(--sp-7) var(--sp-6) var(--sp-8); display: flex; flex-direction: column; gap: var(--sp-6); }
.doc-layout { max-width: var(--wrap); margin: 0 auto; padding: var(--sp-8) var(--sp-6) var(--sp-7); display: grid; grid-template-columns: 240px minmax(0, var(--doc)); justify-content: space-between; column-gap: var(--sp-8); align-items: start; }
.window { min-width: 0; scroll-margin-top: calc(var(--topbar-h) + 16px); }
.window-bar { display: flex; align-items: center; gap: var(--sp-2); padding-bottom: var(--sp-3); margin-bottom: var(--sp-5); border-bottom: 1px solid var(--line); font: 400 var(--fs-label)/1.2 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-2); }
.window-bar .icon { display: none; }
.window-dots { display: none; }
.window-body > * + * { margin-top: var(--sp-4); }
.window-cream { background: var(--carbon); border: 1px solid var(--line); border-radius: var(--r-card); padding: var(--sp-6); }
.window-cream .window-bar { border-bottom: 0; margin-bottom: var(--sp-3); padding-bottom: 0; }
.hero-grid > * + *, .community > * + *, .summary > * + * { margin-top: 0; }
.toc { position: sticky; top: calc(var(--topbar-h) + 32px); }
.toc-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.toc-link { display: flex; align-items: center; gap: var(--sp-2); padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--text-2) !important; text-decoration: none !important; font: 400 var(--fs-label)/1.3 var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; }
.toc-link:hover { color: var(--ice) !important; }
.toc-link.is-current { color: var(--orange) !important; }
.toc-link.is-current::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--orange); flex: none; }
.doc { min-width: 0; }
.doc h1 { font-size: clamp(40px, 5vw, 72px); line-height: 1; letter-spacing: var(--track-display); }
.doc h2 { font-size: clamp(30px, 3.4vw, 44px); }
.doc-intro { margin-top: var(--sp-5) !important; color: var(--text-2); font-size: var(--fs-lead); line-height: 1.5; }
.summary { margin-top: var(--sp-7); display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-4) var(--sp-5); }
.summary-facts { flex: 1 1 320px; list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: var(--sp-3) var(--sp-5); font: 400 var(--fs-label)/1.4 var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ice); }
.summary-facts li { display: inline-flex; align-items: center; gap: var(--sp-2); }
.summary-facts .icon { color: var(--text-2); }
.summary .download-meta { flex-basis: 100%; margin-top: 0 !important; }
.doc-section { margin-top: var(--sp-9); padding-top: var(--sp-6); border-top: 1px solid var(--line); scroll-margin-top: 90px; }
.doc-section > h2 { margin-bottom: var(--sp-5); }
.doc-section > p { color: var(--text-2); }
.doc-section > p + p { margin-top: var(--sp-3); }
.doc-section > .steps { margin-top: var(--sp-6); }
.bullets { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; color: var(--text-2); border-top: 1px solid var(--line); }
.bullets li { position: relative; padding: var(--sp-3) 0 var(--sp-3) 24px; border-bottom: 1px solid var(--line); }
.bullets li::before { content: ""; position: absolute; left: 4px; top: calc(var(--sp-3) + 0.72em); width: 5px; height: 5px; border-radius: 50%; background: var(--cobalt); }

/* Hình minh hoạ trong bước — khung ống ngắm */
.illus { margin-top: var(--sp-5); padding: var(--sp-5); border: 1px solid var(--line-strong); border-radius: var(--r-btn); overflow: hidden;
  background:
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) left -5px top -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) right -5px top -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) left -5px bottom -5px / 10px 10px no-repeat,
    radial-gradient(circle, var(--cobalt) 2.5px, transparent 3px) right -5px bottom -5px / 10px 10px no-repeat,
    var(--carbon);
}
.illus-label { display: block; margin-bottom: var(--sp-4); font: 400 11px/1.3 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-3); }
.tree { list-style: none; margin: 0; padding: 0; font: 14px/1.4 var(--font-mono); color: var(--text-2); }
.tree li { display: flex; align-items: center; gap: var(--sp-2); padding: 8px 10px; border: 1px solid transparent; border-radius: 6px; min-width: 0; }
.tree .tree-child { margin-left: 26px; }
.tree .is-target { border-color: var(--line-full); color: var(--ice); }
.tree-hint { margin-left: auto; font: 400 11px/1.3 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--ice); white-space: nowrap; }

.ss-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-4); margin-top: var(--sp-4); }
.ss-step { font: 400 11px/1.3 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-3); margin-bottom: var(--sp-2); }
.ss { min-height: 220px; display: flex; flex-direction: column; gap: 10px; padding: 18px; background: var(--illus-win-blue); color: #EDEDED; border-radius: 2px; font: 13px/1.45 "Segoe UI", system-ui, sans-serif; letter-spacing: 0; text-transform: none; }
.ss-title { font-size: 19px; font-weight: 600; line-height: 1.25; }
.ss-text { color: var(--illus-win-text-2); }
.ss-link { align-self: flex-start; text-decoration: underline; }
.ss-buttons { margin-top: auto; display: flex; justify-content: flex-end; gap: var(--sp-2); }
.ss-btn { padding: 6px 14px; border: 1px solid var(--illus-win-text-2); font-weight: 600; font-size: 12px; }
.ss-mark { outline: 2px solid var(--orange); outline-offset: 4px; border-radius: 2px; }

.max-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; padding: 6px; background: var(--app-surface); border: 1px solid var(--app-border); border-radius: 4px; }
.max-tool { width: 30px; height: 30px; border-radius: 3px; background: var(--app-surface-hover); }
.max-tool-target { display: inline-flex; align-items: center; height: 30px; padding: 0 10px; border-radius: 3px; background: var(--app-surface-press); outline: 2px solid var(--orange); outline-offset: 2px; color: var(--app-text); font: 600 13px/1 "Segoe UI", system-ui, sans-serif; }
.menu-path { margin-top: var(--sp-4) !important; font: 400 var(--fs-label)/1.5 var(--font-mono); letter-spacing: var(--track-ui); color: var(--text-3); }

.activate { max-width: 330px; margin: 0 auto; padding: 20px; display: flex; flex-direction: column; gap: 14px; background: var(--app-bg); border: 1px solid var(--app-border); border-radius: 14px; color: var(--app-text); font: 13px/1.45 "Segoe UI", system-ui, sans-serif; }
.activate-title { font-size: 16px; font-weight: 600; }
.mock-field { display: flex; flex-direction: column; gap: 6px; color: var(--app-text-2); font-size: 12px; font-weight: 600; }
.mock-input { height: 38px; display: flex; align-items: center; padding: 0 12px; background: var(--app-bg-deep); border: 1px solid var(--app-input-border); border-radius: 10px; color: var(--app-text); font-weight: 400; font-size: 13px; }
.mock-check { display: flex; align-items: flex-start; gap: 8px; color: var(--app-text-2); }
.mock-box { width: 16px; height: 16px; margin-top: 2px; flex: none; border-radius: 4px; background: var(--app-accent); color: var(--app-on-accent); display: grid; place-items: center; }
.mock-box .icon { stroke-width: 2.5; }
.mock-link { color: var(--app-accent-press); text-decoration: underline; }
.mock-btn { height: 36px; border-radius: 999px; display: grid; place-items: center; background: var(--app-accent); color: var(--app-on-accent); font-weight: 600; }

.cmd-list { display: flex; flex-direction: column; gap: var(--sp-4); }
.cmd-card { display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: var(--sp-4) var(--sp-5); padding: var(--sp-5); }
.cmd-ai { display: flex; align-items: center; gap: var(--sp-2); font-size: var(--fs-heading-sm); line-height: 1.2; letter-spacing: var(--track-heading); align-self: start; padding-top: 4px; }
.cmd-rows { display: flex; flex-direction: column; gap: var(--sp-4); min-width: 0; }
.cmd-label { font: 400 11px/1.3 var(--font-mono); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--text-3); margin-bottom: var(--sp-2); }
.cmd-note { margin-top: var(--sp-2); font-size: 14px; color: var(--text-2); }

/* ---------- Co giãn ---------- */
@media (max-width: 1099px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: var(--sp-7); }
  .hero-visual { justify-self: center; }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: var(--sp-4); margin-bottom: var(--sp-7); }
  .section-lead { grid-column: 1; }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--sp-5); }
  .trust { grid-template-columns: minmax(0, 1fr); }
  .trust-item, .trust-item + .trust-item { padding: var(--sp-6) 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .split { grid-template-columns: minmax(0, 1fr); }
  .doc-layout { grid-template-columns: minmax(0, 1fr); max-width: calc(var(--doc) + 64px); padding-top: 0; }
  .toc { top: var(--topbar-h); z-index: 20; margin: 0 calc(var(--sp-6) * -1); padding: 0 var(--sp-6); background: var(--void); border-bottom: 1px solid var(--line); }
  .toc .window-bar { display: none; }
  .toc-list { flex-direction: row; gap: var(--sp-5); overflow-x: auto; scrollbar-width: none; }
  .toc-link { border-bottom: 0; padding: 14px 0; white-space: nowrap; }
  .doc { padding-top: var(--sp-7); }
}
@media (max-width: 699px) {
  .wrap, .topbar-inner { padding: 0 var(--sp-4); }
  .topnav { gap: var(--sp-4); }
  .topnav-link { display: none; }
  .topbar-cta { margin-left: 0; }
  .label-long { display: none; }
  .label-short { display: inline; }
  .hero { padding: var(--sp-7) 0 var(--sp-8); }
  .hero-actions .btn { flex: 1 1 auto; }
  .section { padding: var(--sp-8) 0; }
  .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .feature { min-height: 0; }
  .steps-row { grid-template-columns: minmax(0, 1fr); }
  .steps-row .step, .steps-row .step + .step { padding: var(--sp-5) 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .card { padding: var(--sp-5); }
  .req-item { grid-template-columns: minmax(0, 1fr); gap: var(--sp-1); }
  .community .btn { width: 100%; }
  .desk { padding: var(--sp-5) var(--sp-4) var(--sp-7); }
  .doc-layout { padding: 0 var(--sp-4) var(--sp-7); }
  .toc { margin: 0 calc(var(--sp-4) * -1); padding: 0 var(--sp-4); }
  .summary .btn { width: 100%; }
  .step { grid-template-columns: 40px minmax(0, 1fr); column-gap: var(--sp-4); }
  .ss-pair { grid-template-columns: minmax(0, 1fr); }
  .cmd-card { grid-template-columns: minmax(0, 1fr); }
  .illus { padding: var(--sp-4); }
  .tree .tree-child { margin-left: 14px; }
  .tree-hint { display: none; }
  .faq-btn { font-size: 20px; }
}
@media (max-width: 419px) {
  .topbar-pill { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-property: color, background-color, border-color !important; }
  .faq-btn .icon { transition: none !important; }
}