/* ═══════════════════════════════════════════════════════
   HDSD Typst — style.css
   Light theme — Sáng, sạch, chuyên nghiệp
   ═══════════════════════════════════════════════════════ */

/* ── Reset & Variables ──────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --accent:        #1a73e8;
  --accent-dark:   #1557b0;
  --accent-light:  #e8f0fe;
  --accent-mid:    #4285f4;
  --accent-dim:    rgba(26,115,232,0.1);
  --accent-glow:   rgba(26,115,232,0.25);

  --bg:            #f8f9fa;
  --bg2:           #ffffff;
  --bg3:           #f1f3f4;
  --bg4:           #e8eaed;

  --border:        rgba(0,0,0,0.08);
  --border2:       rgba(0,0,0,0.14);

  --text:          #202124;
  --text2:         #3c4043;
  --text3:         #80868b;

  --green:         #137333;
  --green-bg:      #e6f4ea;
  --emerald:       #0d652d;
  --red:           #c5221f;
  --red-bg:        #fce8e6;
  --orange:        #e37400;
  --orange-bg:     #fef7e0;
  --purple:        #7627bb;
  --purple-bg:     #f3e8fd;
  --teal:          #007b83;
  --teal-bg:       #e6f4f1;
  --blue-bg:       #e8f0fe;

  --topbar-h:      60px;
  --sidebar-w:     265px;
  --font-mono:     'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
  --font-sans:     'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius:        8px;
  --radius-lg:     14px;
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow:        0 2px 12px rgba(0,0,0,0.10);
  --shadow-lg:     0 4px 24px rgba(0,0,0,0.14);
}

html { scroll-behavior: smooth; font-size: 15px; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  min-height: 100vh;
}

/* ── Scrollbar ─────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg3); }
::-webkit-scrollbar-thumb { background: var(--bg4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #bdc1c6; }

/* ── Topbar ─────────────────────────────────────── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--topbar-h);
  background: #ffffff;
  border-bottom: 1px solid var(--border2);
  box-shadow: var(--shadow-sm);
}
.topbar-inner {
  display: flex; align-items: center; gap: 16px;
  height: 100%; padding: 0 20px;
  max-width: 1600px; margin: 0 auto;
}
.menu-btn {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 8px;
  border-radius: var(--radius);
}
.menu-btn span { display: block; width: 22px; height: 2px; background: var(--text3); border-radius: 2px; transition: .25s; }
.menu-btn:hover span { background: var(--accent); }

.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.logo-icon {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), #7627bb);
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 800; color: white;
  box-shadow: 0 2px 8px rgba(26,115,232,0.3);
}
.logo-title { font-size: 15px; font-weight: 700; color: var(--text); line-height: 1.2; }
.logo-sub { font-size: 11px; color: var(--text3); }

.topbar-search {
  flex: 1; max-width: 480px; position: relative;
}
.topbar-search input {
  width: 100%;
  background: var(--bg3);
  border: 1.5px solid transparent;
  border-radius: 24px;
  padding: 8px 16px 8px 38px;
  font-size: 13.5px; color: var(--text);
  font-family: var(--font-sans);
  transition: border-color .2s, background .2s, box-shadow .2s;
  outline: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2380868b' viewBox='0 0 24 24'%3E%3Cpath d='M15.5 14h-.79l-.28-.27A6.471 6.471 0 0 0 16 9.5 6.5 6.5 0 1 0 9.5 16c1.61 0 3.09-.59 4.23-1.57l.27.28v.79l5 4.99L20.49 19l-4.99-5zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 12px center;
}
.topbar-search input:focus {
  border-color: var(--accent);
  background-color: white;
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.topbar-search input::placeholder { color: var(--text3); }

.search-results {
  position: absolute; top: calc(100% + 6px); left: 0; right: 0;
  background: white; border: 1.5px solid var(--border2);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  max-height: 360px; overflow-y: auto; z-index: 200;
  display: none;
}
.search-results.show { display: block; }
.search-result-item {
  padding: 10px 16px; cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background .12s;
}
.search-result-item:hover { background: var(--bg3); }
.search-result-item:last-child { border-bottom: none; }
.sri-title { font-size: 13.5px; font-weight: 500; color: var(--text); }
.sri-keyword {
  display: inline-block; background: var(--accent-light);
  color: var(--accent); font-size: 11px; padding: 2px 8px;
  border-radius: 12px; margin-top: 3px; font-family: var(--font-mono);
}

.topbar-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

.btn-download {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--accent);
  color: white; text-decoration: none;
  padding: 8px 18px; border-radius: 24px;
  font-size: 13px; font-weight: 600;
  transition: background .18s, box-shadow .18s, transform .15s;
  box-shadow: 0 2px 6px rgba(26,115,232,0.3);
  white-space: nowrap;
}
.btn-download:hover {
  background: var(--accent-dark);
  box-shadow: 0 4px 12px rgba(26,115,232,0.4);
  transform: translateY(-1px);
}

/* ── Sidebar ─────────────────────────────────────── */
.sidebar {
  position: fixed; top: var(--topbar-h); left: 0;
  width: var(--sidebar-w); height: calc(100vh - var(--topbar-h));
  background: #ffffff;
  border-right: 1px solid var(--border2);
  overflow-y: auto; overflow-x: hidden;
  z-index: 90; padding: 12px 0 32px;
  transition: transform .3s cubic-bezier(.4,0,.2,1);
}
.sidebar-section { margin-bottom: 2px; }
.sidebar-label {
  font-size: 10.5px; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; color: var(--text3);
  padding: 14px 18px 5px; user-select: none;
}
.nav-link {
  display: block; padding: 7px 16px 7px 20px;
  font-size: 13px; color: var(--text2);
  text-decoration: none;
  transition: background .12s, color .12s;
  position: relative; border-radius: 0 24px 24px 0;
  margin-right: 8px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.nav-link:hover { background: var(--bg3); color: var(--text); }
.nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}
.nav-link.active::before {
  content: ''; position: absolute; left: 0; top: 4px; bottom: 4px;
  width: 3px; background: var(--accent); border-radius: 0 2px 2px 0;
}

/* ── Overlay ─────────────────────────────────────── */
.overlay {
  display: none; position: fixed; inset: 0; z-index: 85;
  background: rgba(60,64,67,0.4);
}
.overlay.show { display: block; }

/* ── Main content ─────────────────────────────────── */
.main-content {
  margin-left: var(--sidebar-w);
  margin-top: var(--topbar-h);
  padding: 36px 48px 80px;
  max-width: calc(960px + var(--sidebar-w));
}

/* ── Doc Section ─────────────────────────────────── */
.doc-section { animation: fadeIn .2s ease; }
.doc-section.hidden { display: none; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Typography ──────────────────────────────────── */
h1 {
  font-size: 1.9rem; font-weight: 800; color: var(--text);
  margin: 0 0 22px; letter-spacing: -.025em;
  line-height: 1.2;
}
h1 .gradient {
  background: linear-gradient(135deg, var(--accent), #7627bb);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
h2 {
  font-size: 1.1rem; font-weight: 700; color: var(--text);
  margin: 32px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--bg4);
}
h2:first-of-type { margin-top: 0; }
p { color: var(--text2); margin-bottom: 14px; }
strong { color: var(--text); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Hero ────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, #e8f0fe 0%, #f3e8fd 50%, #e6f4f1 100%);
  border: 1.5px solid rgba(26,115,232,0.12);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  margin-bottom: 32px;
  position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -60px; right: -60px;
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(118,39,187,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; bottom: -40px; left: 200px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(26,115,232,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: white;
  color: var(--accent);
  font-size: 12px; font-weight: 700; letter-spacing: .05em;
  padding: 5px 14px; border-radius: 20px;
  border: 1.5px solid rgba(26,115,232,0.2);
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}
.hero-title {
  font-size: 2.5rem; line-height: 1.15; margin-bottom: 14px;
  font-weight: 800; letter-spacing: -.03em; color: var(--text);
}
.hero-title .accent {
  background: linear-gradient(135deg, var(--accent) 30%, #7627bb);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-desc { font-size: 1.05rem; color: var(--text2); max-width: 600px; margin-bottom: 24px; }
.hero-pills { display: flex; flex-wrap: wrap; gap: 8px; }
.pill {
  background: white; border: 1.5px solid var(--border2);
  padding: 5px 14px; border-radius: 20px;
  font-size: 13px; color: var(--text2);
  box-shadow: var(--shadow-sm);
  font-weight: 500;
}

/* ── Card grid ───────────────────────────────────── */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-bottom: 28px; }

.feature-card {
  background: white; border: 1.5px solid var(--border2);
  border-radius: var(--radius-lg); padding: 24px;
  cursor: pointer; transition: border-color .18s, transform .18s, box-shadow .18s;
  box-shadow: var(--shadow-sm);
}
.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(26,115,232,0.12);
}
.feature-icon { font-size: 2.2rem; margin-bottom: 12px; }
.feature-title { font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.feature-desc { font-size: 13px; color: var(--text2); margin-bottom: 14px; line-height: 1.55; }
.feature-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.feature-tags span {
  background: var(--bg3); color: var(--text3);
  font-size: 11px; font-family: var(--font-mono);
  padding: 2px 8px; border-radius: 4px; border: 1px solid var(--border2);
}

/* ── Mini cards ──────────────────────────────────── */
.mini-card {
  background: white; border: 1.5px solid var(--border2);
  border-radius: var(--radius); padding: 16px;
  text-align: center; cursor: pointer;
  transition: border-color .18s, transform .18s, box-shadow .15s;
  box-shadow: var(--shadow-sm);
}
.mini-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 4px 12px rgba(26,115,232,0.1); }
.mini-card-icon { font-size: 1.8rem; margin-bottom: 6px; }
.mini-card code { display: block; color: var(--accent); font-size: 14px; margin-bottom: 6px; background: var(--accent-light); padding: 3px 8px; border-radius: 5px; }
.mini-card div { font-size: 12px; color: var(--text3); }

/* ── Info box ────────────────────────────────────── */
.info-box {
  background: var(--blue-bg); border: 1.5px solid rgba(26,115,232,0.2);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius); padding: 16px 20px; margin-top: 20px;
}
.info-box-title { font-weight: 700; margin-bottom: 8px; color: var(--accent); }
.info-box p { margin: 0; font-size: 13.5px; color: var(--text2); }
.info-box code {
  background: rgba(26,115,232,0.12); padding: 1px 6px;
  border-radius: 4px; font-family: var(--font-mono); font-size: 12.5px;
  color: var(--accent-dark);
}

/* ── Callouts ────────────────────────────────────── */
.callout {
  border-radius: var(--radius); padding: 13px 18px;
  margin: 16px 0; font-size: 13.5px; line-height: 1.6;
  border: 1.5px solid;
}
.callout strong { display: block; margin-bottom: 4px; }
.callout-warning {
  background: var(--orange-bg);
  border-color: rgba(227,116,0,0.25);
  color: #7a4100;
}
.callout-warning strong { color: var(--orange); }
.callout-tip {
  background: var(--green-bg);
  border-color: rgba(19,115,51,0.2);
  color: #1e4620;
}
.callout-tip strong { color: var(--green); }
.callout ul { margin-top: 8px; padding-left: 20px; }
.callout li { margin-bottom: 4px; }
.callout a { color: var(--accent); font-weight: 500; }
.callout code {
  background: rgba(0,0,0,0.06); padding: 1px 6px;
  border-radius: 3px; font-family: var(--font-mono); font-size: 12px;
}

/* ── Code blocks ─────────────────────────────────── */
.code-block-wrap {
  margin: 12px 0 20px;
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1.5px solid var(--border2);
  background: #1e1e2e;
  box-shadow: var(--shadow);
}
.code-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 16px;
  background: #13131f;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.code-lang {
  font-size: 11.5px; font-weight: 600; letter-spacing: .05em;
  text-transform: uppercase; color: rgba(255,255,255,0.3);
  font-family: var(--font-mono);
}
.copy-btn {
  background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.5); font-size: 12px; padding: 3px 12px;
  border-radius: 5px; cursor: pointer; font-family: var(--font-sans);
  transition: background .15s, color .15s, border-color .15s;
}
.copy-btn:hover { background: rgba(26,115,232,0.3); color: #a0c4ff; border-color: rgba(26,115,232,0.4); }
.copy-btn.copied { background: rgba(19,115,51,0.4); color: #81c995; border-color: rgba(19,115,51,0.5); }

pre {
  padding: 20px 22px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  color: #cdd6f4;   /* Catppuccin Mocha text */
}

/* Inline code */
code {
  font-family: var(--font-mono);
  font-size: 0.87em;
  background: var(--accent-light);
  color: var(--accent-dark);
  padding: 2px 7px; border-radius: 4px;
  border: 1px solid rgba(26,115,232,0.15);
}
pre code {
  background: none; padding: 0; color: inherit;
  font-size: inherit; border-radius: 0; border: none;
}

/* ── Tables ──────────────────────────────────────── */
.doc-table {
  width: 100%; border-collapse: separate; border-spacing: 0;
  margin: 12px 0 20px; font-size: 13.5px;
  border: 1.5px solid var(--border2); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-sm);
}
.doc-table thead { background: var(--bg3); }
.doc-table th {
  padding: 10px 16px; text-align: left;
  color: var(--text2); font-weight: 700; font-size: 12px;
  border-bottom: 2px solid var(--border2); white-space: nowrap;
  letter-spacing: .03em;
}
.doc-table td {
  padding: 9px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text2); font-size: 13px;
}
.doc-table tr:last-child td { border-bottom: none; }
.doc-table tr:hover td { background: var(--bg3); }
.doc-table code { font-size: 12px; }

/* ── Param table ─────────────────────────────────── */
.param-table { margin: 12px 0 20px; border: 1.5px solid var(--border2); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.param-row {
  display: flex; align-items: flex-start; gap: 10px; flex-wrap: wrap;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: white;
}
.param-row:nth-child(even) { background: var(--bg3); }
.param-row:last-child { border-bottom: none; }
.param-name {
  font-family: var(--font-mono); font-size: 13px; color: var(--accent-dark);
  font-weight: 700; min-width: 120px; flex-shrink: 0;
  background: var(--accent-light); padding: 1px 7px; border-radius: 4px;
}
.param-badge {
  font-size: 10px; padding: 2px 8px; border-radius: 10px; font-weight: 700;
  flex-shrink: 0; margin-top: 3px;
}
.param-badge.required { background: var(--red-bg); color: var(--red); border: 1px solid rgba(197,34,31,0.2); }
.param-badge.optional { background: var(--green-bg); color: var(--green); border: 1px solid rgba(19,115,51,0.2); }
.param-type { color: var(--text3); font-size: 12px; font-family: var(--font-mono); flex-shrink: 0; margin-top: 3px; }
.param-desc { color: var(--text2); font-size: 13px; flex: 1; min-width: 200px; }

/* ── Req grid ────────────────────────────────────── */
.req-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin: 12px 0 22px; }
.req-item {
  display: flex; align-items: flex-start; gap: 10px;
  background: white; border: 1.5px solid var(--border2);
  border-radius: var(--radius); padding: 14px;
  box-shadow: var(--shadow-sm);
}
.req-icon { font-size: 1.3rem; flex-shrink: 0; margin-top: 1px; }
.req-note { font-size: 12px; color: var(--text3); margin-top: 3px; }

/* ── Tabs ────────────────────────────────────────── */
.tabs { display: flex; gap: 4px; margin-bottom: 18px; flex-wrap: wrap; background: var(--bg3); padding: 4px; border-radius: 10px; width: fit-content; }
.tab {
  background: transparent; border: none;
  color: var(--text3); padding: 7px 18px; border-radius: 7px;
  font-size: 13px; cursor: pointer; font-family: var(--font-sans);
  transition: background .15s, color .15s;
  font-weight: 500;
}
.tab:hover { background: white; color: var(--text); }
.tab.active {
  background: white;
  color: var(--accent);
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Flow steps ──────────────────────────────────── */
.flow-steps {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  margin: 14px 0 22px;
}
.flow-step {
  display: flex; align-items: center; gap: 10px;
  background: white; border: 1.5px solid var(--border2);
  border-radius: var(--radius); padding: 11px 16px; font-size: 13px;
  box-shadow: var(--shadow-sm);
}
.flow-num {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: white;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; flex-shrink: 0;
}
.flow-arrow { color: var(--text3); font-size: 18px; }

/* ── Box showcase ────────────────────────────────── */
.box-showcase { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 10px; margin: 12px 0 22px; }
.box-demo {
  border-radius: var(--radius); padding: 14px 16px;
  border: 1.5px solid; transition: transform .18s, box-shadow .18s;
  background: white;
}
.box-demo:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.box-demo-label { font-size: 13px; font-weight: 700; margin-bottom: 6px; }
.box-demo-code { font-family: var(--font-mono); font-size: 11.5px; color: var(--text3); }

.ppgiai-demo  { border-color: rgba(19,115,51,0.3);  }
.ppgiai-demo .box-demo-label  { color: var(--green); }
.luuy-demo    { border-color: rgba(227,116,0,0.3);  }
.luuy-demo .box-demo-label    { color: var(--orange); }
.meo-demo     { border-color: rgba(118,39,187,0.3); }
.meo-demo .box-demo-label     { color: var(--purple); }
.nhanxet-demo { border-color: rgba(0,123,131,0.3);  }
.nhanxet-demo .box-demo-label { color: var(--teal); }
.lythuyet-demo { border-color: rgba(26,115,232,0.3); }
.lythuyet-demo .box-demo-label { color: var(--accent); }
.note-demo    { border-color: rgba(60,64,67,0.2);   }
.note-demo .box-demo-label    { color: var(--text2); }
.dn-demo      { border-color: rgba(26,115,232,0.3); }
.dn-demo .box-demo-label      { color: var(--accent-dark); }
.dl-demo      { border-color: rgba(197,34,31,0.3);  }
.dl-demo .box-demo-label      { color: var(--red); }
.tc-demo      { border-color: rgba(19,115,51,0.3);  }
.tc-demo .box-demo-label      { color: var(--green); }
.bode-demo    { border-color: rgba(227,116,0,0.3);  }
.bode-demo .box-demo-label    { color: var(--orange); }

/* ── Box list ────────────────────────────────────── */
.box-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 8px; margin: 12px 0 20px; }
.box-item {
  display: flex; align-items: flex-start; gap: 10px;
  background: white; border: 1.5px solid var(--border2);
  border-radius: var(--radius); padding: 10px 14px;
  font-size: 13px; box-shadow: var(--shadow-sm);
}
.box-item code { color: var(--accent-dark); flex-shrink: 0; }
.box-item div { color: var(--text3); font-size: 12px; margin-top: 2px; }

/* ── Hierarchy tree ──────────────────────────────── */
.hierarchy-tree { margin: 12px 0 20px; }
.tree-item {
  padding: 7px 14px; border-left: 3px solid var(--border2);
  margin-bottom: 2px; font-size: 13.5px;
  background: white; border-radius: 0 var(--radius) var(--radius) 0;
  margin-bottom: 3px;
}
.tree-item.level-0 { border-left-color: var(--accent); background: var(--accent-light); }
.tree-item.level-1 { margin-left: 20px; border-left-color: var(--green); background: var(--green-bg); }
.tree-item.level-2 { margin-left: 40px; border-left-color: var(--orange); background: var(--orange-bg); }
.tree-item.level-3 { margin-left: 60px; border-left-color: var(--purple); background: var(--purple-bg); }
.tree-item.level-4 { margin-left: 80px; border-left-color: var(--text3); }
.tree-alias { font-size: 11px; color: var(--text3); margin-left: 8px; }

/* ── Downloads ───────────────────────────────────── */
.download-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin-bottom: 28px; }
.download-card {
  background: white; border: 1.5px solid var(--border2);
  border-radius: var(--radius-lg); padding: 22px;
  display: flex; flex-direction: column; gap: 10px;
  transition: border-color .18s, transform .18s, box-shadow .18s;
  box-shadow: var(--shadow-sm);
}
.download-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(26,115,232,0.1); }
.dl-icon { font-size: 2.2rem; }
.dl-title { font-size: 1rem; font-weight: 700; color: var(--text); }
.dl-desc { font-size: 13px; color: var(--text2); flex: 1; line-height: 1.5; }
.dl-meta { font-size: 11.5px; color: var(--text3); }
.dl-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--accent); color: white; text-decoration: none;
  padding: 9px 16px; border-radius: 24px;
  font-size: 13px; font-weight: 600; margin-top: 4px;
  transition: background .18s, box-shadow .18s;
  box-shadow: 0 2px 6px rgba(26,115,232,0.25);
}
.dl-btn:hover { background: var(--accent-dark); box-shadow: 0 4px 12px rgba(26,115,232,0.35); text-decoration: none; }

/* ── Back to top ─────────────────────────────────── */
.back-to-top {
  position: fixed; bottom: 28px; right: 28px; z-index: 80;
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--accent); color: white;
  border: none; cursor: pointer; font-size: 18px;
  box-shadow: 0 4px 12px rgba(26,115,232,0.35);
  transition: opacity .2s, transform .2s;
  opacity: 0; pointer-events: none;
}
.back-to-top.show { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 6px 18px rgba(26,115,232,0.45); }

/* ── Responsive ──────────────────────────────────── */
@media (max-width: 900px) {
  .menu-btn { display: flex; }
  .topbar-search { max-width: 200px; }

  .sidebar {
    transform: translateX(-100%);
    z-index: 95;
    box-shadow: none;
  }
  .sidebar.open { transform: translateX(0); box-shadow: var(--shadow-lg); }

  .main-content { margin-left: 0; padding: 24px 20px 60px; }
  .btn-download { font-size: 12px; padding: 7px 14px; }
  .hero { padding: 28px 20px; }
  .hero-title { font-size: 1.8rem; }
  h1 { font-size: 1.5rem; }
}

@media (max-width: 600px) {
  .topbar-search { display: none; }
  .flow-steps { flex-direction: column; align-items: flex-start; }
  .flow-arrow { transform: rotate(90deg); }
  .card-grid { grid-template-columns: 1fr; }
  .download-grid { grid-template-columns: 1fr; }
}