/* ═══════════════════════════════════════════
   DESIGN SYSTEM
═══════════════════════════════════════════ */
:root {
  --bg:         #fafafa;
  --bg1:        #ffffff;
  --bg2:        #f2f3f6;
  --bg3:        #ececf1;
  --surface:    #ffffff;
  --surface2:   #f5f6f8;
  --glass:      rgba(20,21,26,0.025);
  --glass2:     rgba(20,21,26,0.05);

  --cyan:       #6d5ef5;
  --cyan2:      #4f3fd9;
  --green:      #16a34a;
  --green2:     #0d9488;
  --yellow:     #d97706;
  --red:        #dc2626;
  --purple:     #8b5cf6;
  --orange:     #ea580c;

  --text:       #14151a;
  --text2:      #52596b;
  --text3:      #7c8591;
  --border:     rgba(20,21,26,0.08);
  --border2:    rgba(20,21,26,0.13);
  --border3:    rgba(109,94,245,0.35);

  --grad-main:  linear-gradient(135deg, #6d5ef5 0%, #16a34a 100%);
  --grad-warm:  linear-gradient(135deg, #d97706 0%, #ea580c 100%);
  --grad-cool:  linear-gradient(135deg, #8b5cf6 0%, #6d5ef5 100%);
  --grad-danger:linear-gradient(135deg, #dc2626 0%, #ea580c 100%);

  --shadow-card: 0 1px 2px rgba(20,21,26,0.04), 0 8px 24px rgba(20,21,26,0.05);

  --sidebar-w: 280px;
  --font-display: 'Geist', sans-serif;
  --font-body: 'Geist', sans-serif;
  --font-mono: 'Geist Mono', monospace;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  overflow-x: hidden;
}
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface2); border-radius: 2px; }
a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── READING PROGRESS BAR ── */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: var(--grad-main);
  width: 0%;
  z-index: 9999;
  transition: width 0.1s linear;
}

/* ═══════════════════════════════════════════
   SIDEBAR
═══════════════════════════════════════════ */
.sidebar {
  position: fixed;
  top: 0; left: 0;
  width: var(--sidebar-w);
  height: 100vh;
  background: var(--bg1);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  z-index: 200;
  display: flex;
  flex-direction: column;
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
}

.sidebar-brand {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.brand-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(109,94,245,0.1);
  border: 1px solid rgba(109,94,245,0.2);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 3px 10px;
  border-radius: 100px;
  margin-bottom: 10px;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.brand-meta {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.mini-badge {
  font-family: var(--font-mono);
  font-size: 9px;
  padding: 2px 8px;
  border-radius: 100px;
  border: 1px solid;
}

.mb-green { color: var(--green); border-color: rgba(22,163,74,0.3); background: rgba(22,163,74,0.06); }
.mb-yellow { color: var(--yellow); border-color: rgba(245,158,11,0.3); background: rgba(245,158,11,0.06); }
.mb-cyan { color: var(--cyan); border-color: rgba(109,94,245,0.3); background: rgba(109,94,245,0.06); }

/* ── NAV ── */
.nav-section { padding: 16px 0 4px; }
.nav-label {
  padding: 0 20px 6px;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text3);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 20px;
  font-size: 12.5px;
  color: var(--text2);
  cursor: pointer;
  border-left: 2px solid transparent;
  transition: all 0.15s;
  text-decoration: none;
  font-weight: 500;
}

.nav-item:hover { color: var(--text); background: var(--glass2); text-decoration: none; }
.nav-item.active { color: var(--cyan); border-left-color: var(--cyan); background: rgba(109,94,245,0.06); }

.nav-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text3);
  flex-shrink: 0;
  transition: background 0.15s;
}
.nav-item.active .nav-dot { background: var(--cyan); box-shadow: 0 0 6px var(--cyan); }
.nav-item:hover .nav-dot { background: var(--text2); }

/* ── Hero pipeline (signature element): the AI Studio → GitHub →
   Vercel → Android journey, echoed in the sidebar's active-stage dot */
.hero-pipeline {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 38px;
  flex-wrap: wrap;
}

.pipeline-stage {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.pipeline-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--stage-color, var(--cyan));
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--stage-color, var(--cyan)) 16%, transparent);
}

.pipeline-line {
  width: 26px;
  height: 1px;
  background-image: repeating-linear-gradient(to right, var(--border2) 0 4px, transparent 4px 9px);
}

@media (max-width: 720px) {
  .hero-pipeline { gap: 7px; }
  .pipeline-line { width: 14px; }
}

/* ═══════════════════════════════════════════
   MAIN
═══════════════════════════════════════════ */
.main { margin-left: var(--sidebar-w); }

/* ═══════════════════════════════════════════
   HERO
═══════════════════════════════════════════ */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 70px;
  position: relative;
  overflow: hidden;
  background: var(--bg);
  id: "intro";
}

/* Animated mesh gradient background */
.hero-mesh {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.mesh-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  animation: orbFloat 8s ease-in-out infinite;
}

.orb1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(109,94,245,0.12) 0%, transparent 70%);
  top: -200px; right: -100px;
  animation-delay: 0s;
}

.orb2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(22,163,74,0.08) 0%, transparent 70%);
  bottom: -150px; left: 10%;
  animation-delay: -3s;
}

.orb3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(139,92,246,0.07) 0%, transparent 70%);
  top: 40%; left: 40%;
  animation-delay: -5s;
}

/* Grid pattern */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(109,94,245,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(109,94,245,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
}

.hero-content { position: relative; z-index: 2; max-width: 800px; }

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 28px;
  flex-wrap: wrap;
  animation: fadeUp 0.7s 0.1s both;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  border: 1px solid;
  font-family: var(--font-mono);
}

.pill-cyan { color: var(--cyan); border-color: rgba(109,94,245,0.3); background: rgba(109,94,245,0.08); }
.pill-green { color: var(--green); border-color: rgba(22,163,74,0.3); background: rgba(22,163,74,0.08); }
.pill-yellow { color: var(--yellow); border-color: rgba(245,158,11,0.3); background: rgba(245,158,11,0.08); }
.pill-purple { color: var(--purple); border-color: rgba(139,92,246,0.3); background: rgba(139,92,246,0.08); }

.pill .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 2s infinite;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 7vw, 7rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 0.95;
  color: var(--text);
  margin-bottom: 24px;
  animation: fadeUp 0.7s 0.2s both;
}

.hero-title .gradient-text {
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title .arrow {
  display: inline-block;
  color: var(--text3);
  animation: arrowPulse 2s infinite;
  -webkit-text-fill-color: var(--text3);
}

.hero-desc {
  font-size: 16px;
  color: var(--text2);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 40px;
  animation: fadeUp 0.7s 0.3s both;
}

/* Meta stats */
.hero-stats {
  display: flex;
  gap: 0;
  border: 1px solid var(--border2);
  border-radius: 14px;
  overflow: hidden;
  width: fit-content;
  animation: fadeUp 0.7s 0.4s both;
  background: var(--glass);
  backdrop-filter: blur(20px);
}

.stat {
  padding: 18px 28px;
  border-right: 1px solid var(--border);
  text-align: center;
}
.stat:last-child { border-right: none; }
.stat-val {
  display: block;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 4px;
}
.stat-key {
  display: block;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text3);
  font-weight: 600;
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 36px;
  left: 70px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text3);
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  animation: fadeUp 0.7s 0.8s both;
}

.scroll-line {
  width: 40px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--text3));
}

/* ═══════════════════════════════════════════
   BENTO INTRO GRID
═══════════════════════════════════════════ */
.bento-section {
  padding: 60px 70px;
  background: var(--bg1);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-template-rows: auto;
  gap: 16px;
}

.bento-card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 16px;
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}

.bento-card:hover {
  border-color: var(--border3);
  transform: translateY(-2px);
}

.bento-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(109,94,245,0.03) 0%, transparent 60%);
  pointer-events: none;
}

.bc-what { grid-column: span 7; }
.bc-stack { grid-column: span 5; }
.bc-time { grid-column: span 4; }
.bc-prereq { grid-column: span 8; }

.bento-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text3);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.bento-label::before {
  content: '';
  display: inline-block;
  width: 3px;
  height: 12px;
  background: var(--grad-main);
  border-radius: 2px;
}

.bento-card h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.2;
}

.build-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.build-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text2);
}

.build-list li::before {
  content: '';
  width: 16px; height: 16px;
  border-radius: 50%;
  background: rgba(22,163,74,0.15);
  border: 1px solid rgba(22,163,74,0.4);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 9px;
  color: var(--green);
}

.stack-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stack-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg2);
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 12.5px;
}

.stack-row .s-label { color: var(--text3); font-weight: 600; text-transform: uppercase; font-size: 10px; letter-spacing: 0.1em; }
.stack-row .s-val { font-family: var(--font-mono); color: var(--cyan); font-size: 12px; }

.time-display {
  text-align: center;
  padding: 10px 0;
}

.time-number {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 800;
  background: var(--grad-warm);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.time-unit { font-size: 12px; color: var(--text3); letter-spacing: 0.1em; text-transform: uppercase; margin-top: 4px; }
.time-diff { margin-top: 12px; font-size: 12px; color: var(--text2); }

.prereq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.prereq-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg2);
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 12.5px;
  color: var(--text2);
}

.prereq-icon { font-size: 1rem; flex-shrink: 0; }

/* ═══════════════════════════════════════════
   SECTION LAYOUT
═══════════════════════════════════════════ */
.doc-section {
  padding: 70px 70px;
  border-bottom: 1px solid var(--border);
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.doc-section.revealed {
  opacity: 1;
  transform: translateY(0);
}

.section-eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.section-part {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.section-divider {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, var(--border2), transparent);
}

.section-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text3);
}

h2.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
  color: var(--text);
  line-height: 1.05;
  letter-spacing: 0.01em;
  margin-bottom: 8px;
}

h2.section-title .hl { color: var(--cyan); }

.section-sub {
  font-size: 15px;
  color: var(--text2);
  max-width: 620px;
  margin-bottom: 40px;
  line-height: 1.65;
}

/* ═══════════════════════════════════════════
   ACCOUNT SETUP - 3-column card strip
═══════════════════════════════════════════ */
.account-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

.acc-card {
  border-radius: 16px;
  padding: 28px 24px;
  border: 1px solid var(--border2);
  position: relative;
  overflow: hidden;
  transition: transform 0.2s;
}

.acc-card:hover { transform: translateY(-4px); }

.acc-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
}

.acc-gmail { background: linear-gradient(135deg, rgba(234,67,53,0.08), rgba(251,188,5,0.06)); }
.acc-gmail::after { background: linear-gradient(to right, #ea4335, #fbbc05); }
.acc-github { background: linear-gradient(135deg, rgba(110,64,201,0.08), rgba(35,134,54,0.06)); }
.acc-github::after { background: linear-gradient(to right, #6e40c9, #238636); }
.acc-vercel { background: linear-gradient(135deg, rgba(20,21,26,0.045), rgba(20,21,26,0.02)); }
.acc-vercel::after { background: linear-gradient(to right, #14151a 0%, #8a92a0 100%); }

.acc-icon { font-size: 2.2rem; margin-bottom: 14px; display: block; }
.acc-step { font-family: var(--font-mono); font-size: 10px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 6px; }
.acc-name { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.acc-desc { font-size: 12.5px; color: var(--text2); line-height: 1.55; }

/* ═══════════════════════════════════════════
   STEPS
═══════════════════════════════════════════ */
.steps-container {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.step-item {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 0 20px;
}

.step-spine {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.step-num {
  width: 42px; height: 42px;
  border-radius: 12px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--cyan);
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.step-num.critical {
  background: rgba(220,38,38,0.1);
  border-color: rgba(220,38,38,0.3);
  color: var(--red);
}

.step-num.important {
  background: rgba(245,158,11,0.1);
  border-color: rgba(245,158,11,0.3);
  color: var(--yellow);
}

.step-connector {
  width: 2px;
  flex: 1;
  min-height: 20px;
  background: linear-gradient(to bottom, var(--border2), transparent);
  margin-top: 4px;
}

.step-body {
  padding: 4px 0 36px;
  min-width: 0;
}

.step-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.step-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0.02em;
}

.step-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.tag-crit { background: rgba(220,38,38,0.12); color: var(--red); border: 1px solid rgba(220,38,38,0.25); }
.tag-imp { background: rgba(245,158,11,0.12); color: var(--yellow); border: 1px solid rgba(245,158,11,0.25); }
.tag-ok { background: rgba(22,163,74,0.1); color: var(--green); border: 1px solid rgba(22,163,74,0.25); }

.step-content { color: var(--text2); font-size: 14px; line-height: 1.72; }
.step-content p { margin-bottom: 12px; }
.step-content strong { color: var(--text); font-weight: 600; }
.step-content em { color: var(--text3); font-style: italic; }
.step-content ul, .step-content ol { padding-left: 18px; margin-bottom: 12px; }
.step-content li { margin-bottom: 6px; }

/* ═══════════════════════════════════════════
   ALERTS
═══════════════════════════════════════════ */
.alert {
  border-radius: 10px;
  padding: 14px 18px;
  margin: 16px 0;
  font-size: 13.5px;
  line-height: 1.65;
  display: flex;
  gap: 12px;
  border: 1px solid;
}

.alert-icon { font-size: 1.1rem; flex-shrink: 0; margin-top: 1px; }
.alert-body { flex: 1; }
.alert-body strong { font-weight: 700; display: block; margin-bottom: 2px; }

.a-crit { background: rgba(220,38,38,0.07); border-color: rgba(220,38,38,0.25); color: #9f1d1d; }
.a-crit strong { color: var(--red); }
.a-warn { background: rgba(245,158,11,0.08); border-color: rgba(245,158,11,0.3); color: #8a5a05; }
.a-warn strong { color: var(--yellow); }
.a-info { background: rgba(109,94,245,0.07); border-color: rgba(109,94,245,0.25); color: #4a3fc4; }
.a-info strong { color: var(--cyan); }
.a-ok { background: rgba(22,163,74,0.07); border-color: rgba(22,163,74,0.22); color: #166534; }
.a-ok strong { color: var(--green); }

/* ═══════════════════════════════════════════
   CODE BLOCKS
═══════════════════════════════════════════ */
.code-block {
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border2);
  margin: 16px 0;
  background: #050810;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 10px; height: 10px;
  border-radius: 50%;
}

.cd1 { background: #ff5f57; }
.cd2 { background: #febc2e; }
.cd3 { background: #28c840; }

.code-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.copy-btn {
  background: var(--glass2);
  border: 1px solid var(--border2);
  color: var(--text3);
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.copy-btn:hover { color: var(--cyan); border-color: rgba(109,94,245,0.3); }

.code-block pre {
  padding: 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.75;
  color: #c9d1e0;
}

.code-block code { font-family: inherit; }

p code, li code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: rgba(109,94,245,0.07);
  border: 1px solid rgba(109,94,245,0.15);
  color: var(--cyan);
  padding: 1px 6px;
  border-radius: 4px;
}

/* syntax */
.kw { color: #ff79c6; }
.str { color: #f1fa8c; }
.com { color: #44475a; font-style: italic; }
.fn { color: #50fa7b; }
.val { color: #bd93f9; }
.tag-c { color: #ff5555; }
.attr { color: #ffb86c; }

/* ═══════════════════════════════════════════
   CRITICAL FILES - SPLIT PANEL
═══════════════════════════════════════════ */
.split-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 32px 0;
  min-width: 0;
}

.split-panel > .panel-card { min-width: 0; }

.panel-card {
  border-radius: 14px;
  border: 1px solid var(--border2);
  overflow: hidden;
  background: var(--surface);
}

.panel-card.critical-panel {
  border-color: rgba(245,158,11,0.3);
  background: linear-gradient(135deg, rgba(245,158,11,0.04), var(--surface));
}

.panel-header {
  padding: 16px 20px;
  background: var(--bg3);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-header .ph-num {
  width: 24px; height: 24px;
  border-radius: 6px;
  background: rgba(245,158,11,0.15);
  border: 1px solid rgba(245,158,11,0.3);
  color: var(--yellow);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.panel-header .ph-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.panel-header .ph-file {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--yellow);
  background: rgba(245,158,11,0.1);
  padding: 2px 8px;
  border-radius: 4px;
  margin-left: auto;
}

.panel-body { padding: 20px; font-size: 13.5px; color: var(--text2); line-height: 1.65; }
.panel-body p { margin-bottom: 10px; }
.panel-body strong { color: var(--text); }

/* ═══════════════════════════════════════════
   ENV VARS - VISUAL TABLE
═══════════════════════════════════════════ */
.env-visual {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 20px 0;
}

.env-row {
  display: flex;
  align-items: center;
  gap: 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border2);
  background: var(--surface);
  transition: border-color 0.2s;
}

.env-row:hover { border-color: rgba(109,94,245,0.25); }

.env-key {
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--cyan);
  background: rgba(109,94,245,0.06);
  border-right: 1px solid var(--border2);
  min-width: 240px;
  overflow-wrap: anywhere;
}

.env-arrow {
  padding: 0 16px;
  color: var(--text3);
  font-size: 18px;
  flex-shrink: 0;
}

.env-val {
  flex: 1;
  min-width: 0;
  padding: 14px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text3);
  overflow-wrap: anywhere;
}

.env-all {
  padding: 14px 16px;
  border-left: 1px solid var(--border);
  display: flex;
  gap: 4px;
}

.env-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 4px var(--green);
}

/* ═══════════════════════════════════════════
   ANDROID INSTALL - VISUAL STEPS
═══════════════════════════════════════════ */
.phone-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 28px 0;
}

.phone-step {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 14px;
  padding: 24px 20px;
  text-align: center;
  transition: transform 0.2s, border-color 0.2s;
  position: relative;
}

.phone-step:hover { transform: translateY(-4px); border-color: rgba(22,163,74,0.3); }

.ps-num {
  position: absolute;
  top: 12px; right: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--text3);
}

.ps-icon { font-size: 2rem; margin-bottom: 12px; display: block; }
.ps-title { font-family: var(--font-display); font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
.ps-desc { font-size: 12.5px; color: var(--text2); line-height: 1.55; }

/* ═══════════════════════════════════════════
   UPDATE WORKFLOW SOP
═══════════════════════════════════════════ */
.sop-chain {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 24px 0;
  position: relative;
}

.sop-chain::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--green));
  opacity: 0.2;
  z-index: 0;
}

.sop-item {
  display: flex;
  gap: 20px;
  position: relative;
  z-index: 1;
  padding-bottom: 24px;
}

.sop-left {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sop-circle {
  width: 48px; height: 48px;
  border-radius: 50%;
  border: 2px solid;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 800;
  background: var(--bg);
  flex-shrink: 0;
}

.sop-1 .sop-circle { border-color: var(--cyan); color: var(--cyan); }
.sop-2 .sop-circle { border-color: var(--yellow); color: var(--yellow); }
.sop-3 .sop-circle { border-color: var(--green); color: var(--green); }
.sop-4 .sop-circle { border-color: var(--purple); color: var(--purple); }
.sop-5 .sop-circle { border-color: var(--orange); color: var(--orange); }

.sop-right { flex: 1; min-width: 0; padding-top: 8px; }
.sop-right h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.sop-right p { font-size: 13.5px; color: var(--text2); line-height: 1.65; margin-bottom: 8px; }

/* ═══════════════════════════════════════════
   TROUBLESHOOTING - FLOWCHART + ACCORDION
═══════════════════════════════════════════ */

/* Flowchart */
.flowchart {
  background: var(--bg1);
  border: 1px solid var(--border2);
  border-radius: 16px;
  padding: 32px;
  margin: 28px 0;
  overflow-x: auto;
}

.flowchart-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  min-width: 480px;
}

.fc-node {
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 13.5px;
  font-weight: 600;
  text-align: center;
  min-width: 200px;
  position: relative;
}

.fc-start { background: rgba(109,94,245,0.12); border: 2px solid var(--cyan); color: var(--cyan); font-family: var(--font-display); font-size: 1rem; }
.fc-check { background: rgba(245,158,11,0.08); border: 1px solid rgba(245,158,11,0.3); color: var(--yellow); border-radius: 50%; width: 180px; height: 60px; display: flex; align-items: center; justify-content: center; font-size: 13px; }
.fc-action { background: var(--surface); border: 1px solid var(--border2); color: var(--text2); font-size: 12.5px; font-weight: 500; }
.fc-ok { background: rgba(22,163,74,0.1); border: 1px solid rgba(22,163,74,0.3); color: var(--green); }

.fc-row {
  display: flex;
  align-items: flex-start;
  gap: 0;
  width: 100%;
  justify-content: center;
}

.fc-branch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  flex: 1;
}

.fc-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 10px;
}

.fc-line {
  width: 2px;
  height: 28px;
  background: var(--border2);
}

.fc-label {
  font-size: 10px;
  font-family: var(--font-mono);
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
}

.fc-yes { color: var(--green); background: rgba(22,163,74,0.1); }
.fc-no { color: var(--red); background: rgba(220,38,38,0.1); }

.fc-h-line {
  height: 2px;
  width: 60px;
  background: var(--border2);
}

/* Flowchart YES/NO branch split */
.fc-branches { display: flex; width: 100%; justify-content: center; margin: 0; }
.fc-branch-col { display: flex; flex-direction: column; align-items: center; width: 50%; min-width: 0; }

.fc-branch-yes .fc-branch-connector { height: 2px; width: 50%; background: var(--border2); margin-left: auto; }
.fc-branch-no .fc-branch-connector { height: 2px; width: 50%; background: var(--border2); margin-right: auto; }

.fc-branch-label-row { display: flex; width: 100%; }
.fc-branch-label-yes { justify-content: flex-end; padding-right: 4px; }
.fc-branch-label-no { padding-left: 4px; }

.fc-branch-yes .fc-branch-drop { height: 20px; width: 2px; background: var(--border2); margin-left: auto; margin-right: 25%; }
.fc-branch-no .fc-branch-drop { height: 20px; width: 2px; background: var(--border2); margin-right: auto; margin-left: 25%; }

.fc-branch-yes .fc-branch-node { margin-left: auto; margin-right: 0; width: 90%; }
.fc-branch-no .fc-branch-node { margin-right: auto; width: 90%; }

.fc-branch-check { margin-right: auto; margin-left: 0; width: 180px; height: 60px; }

/* Issue accordion */
.issues-list { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }

.issue-card {
  border-radius: 12px;
  border: 1px solid var(--border2);
  overflow: hidden;
  background: var(--surface);
  transition: border-color 0.2s;
}

.issue-card:hover { border-color: var(--border3); }

.issue-trigger {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  text-align: left;
  background: var(--bg3);
}

.iss-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--red);
  background: rgba(220,38,38,0.1);
  border: 1px solid rgba(220,38,38,0.25);
  padding: 3px 10px;
  border-radius: 4px;
  flex-shrink: 0;
}

.iss-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  flex: 1;
  min-width: 0;
}

.iss-chevron {
  color: var(--text3);
  font-size: 14px;
  transition: transform 0.2s;
  flex-shrink: 0;
}

.issue-trigger.open .iss-chevron { transform: rotate(180deg); }

.issue-body {
  display: none;
  padding: 20px;
}

.issue-body.open { display: block; }

.ib-section { margin-bottom: 14px; }
.ib-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text3);
  margin-bottom: 8px;
}

.ib-list { list-style: none; padding: 0; }
.ib-list li {
  padding: 7px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13.5px;
  color: var(--text2);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.ib-list li:last-child { border-bottom: none; }
.ib-list li::before { content: '→'; color: var(--cyan); flex-shrink: 0; margin-top: 1px; }

/* ═══════════════════════════════════════════
   BEST PRACTICES - BENTO
═══════════════════════════════════════════ */
.tips-bento {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin: 24px 0;
}

.tip-card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 14px;
  padding: 22px 20px;
  transition: transform 0.2s, border-color 0.2s;
  position: relative;
  overflow: hidden;
}

.tip-card:hover { transform: translateY(-3px); border-color: rgba(109,94,245,0.2); }

.tip-card::before {
  content: '';
  position: absolute;
  bottom: 0; right: 0;
  width: 80px; height: 80px;
  background: radial-gradient(circle, rgba(109,94,245,0.05), transparent 70%);
  pointer-events: none;
}

.tc-icon { font-size: 1.4rem; margin-bottom: 10px; }
.tc-title { font-family: var(--font-display); font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.tc-desc { font-size: 13px; color: var(--text2); line-height: 1.6; }

/* Free tier table */
.tier-table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border2);
}

.tier-table th {
  background: var(--surface2);
  padding: 12px 18px;
  text-align: left;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text3);
  font-weight: 700;
}

.tier-table td {
  padding: 13px 18px;
  border-bottom: 1px solid var(--border);
  font-size: 13.5px;
  color: var(--text2);
  vertical-align: top;
}

.tier-table tr:last-child td { border-bottom: none; }
.tier-table td:first-child { font-weight: 700; color: var(--text); }

/* ═══════════════════════════════════════════
   GLOSSARY
═══════════════════════════════════════════ */
.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.gls-item {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 10px;
  padding: 14px 16px;
  transition: border-color 0.15s;
}

.gls-item:hover { border-color: rgba(109,94,245,0.25); }
.gls-term { font-family: var(--font-mono); font-size: 12.5px; font-weight: 700; color: var(--cyan); margin-bottom: 5px; }
.gls-def { font-size: 12.5px; color: var(--text2); line-height: 1.55; }

/* ═══════════════════════════════════════════
   FILE TREE
═══════════════════════════════════════════ */
.file-tree {
  background: #04070f;
  border: 1px solid var(--border2);
  border-radius: 12px;
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 2.1;
  overflow-x: auto;
  margin: 20px 0;
}

.ft-dir { color: #60a5fa; }
.ft-file { color: var(--text2); }
.ft-comment { color: #2a3350; }
.ft-critical { color: var(--yellow); font-weight: 700; }
.ft-tree { color: var(--text3); }

/* ═══════════════════════════════════════════
   SUCCESS FINALE
═══════════════════════════════════════════ */
.finale {
  padding: 80px 70px;
  background: var(--bg1);
  border-top: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.finale::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(22,163,74,0.04) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(109,94,245,0.04) 0%, transparent 60%);
  pointer-events: none;
}

.finale-inner {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.finale-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: rgba(22,163,74,0.08);
  border: 1px solid rgba(22,163,74,0.25);
  border-radius: 100px;
  color: var(--green);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 28px;
  letter-spacing: 0.03em;
}

.finale h2 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 800;
  background: var(--grad-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 20px;
}

.finale-sub {
  font-size: 15px;
  color: var(--text2);
  max-width: 480px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.checklist-done {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
  text-align: left;
  margin-bottom: 48px;
}

.cd-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(22,163,74,0.05);
  border: 1px solid rgba(22,163,74,0.15);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text2);
}

.cd-check {
  width: 18px; height: 18px;
  border-radius: 50%;
  background: rgba(22,163,74,0.15);
  border: 1px solid rgba(22,163,74,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  color: var(--green);
  flex-shrink: 0;
}

/* Next steps grid */
.next-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.next-card {
  background: var(--surface);
  border: 1px solid var(--border2);
  border-radius: 12px;
  padding: 20px;
  text-align: left;
  transition: border-color 0.2s, transform 0.2s;
}

.next-card:hover { border-color: rgba(109,94,245,0.25); transform: translateY(-3px); }
.nc-phase { font-family: var(--font-mono); font-size: 10px; color: var(--text3); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 6px; }
.nc-title { font-family: var(--font-display); font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.nc-desc { font-size: 12px; color: var(--text2); line-height: 1.5; }

/* ═══════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════ */
footer {
  margin-left: var(--sidebar-w);
  background: var(--bg1);
  border-top: 1px solid var(--border);
  padding: 28px 70px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
  color: var(--text3);
  font-family: var(--font-mono);
}

footer .f-right { display: flex; gap: 20px; }
footer span { color: var(--text2); }

/* ═══════════════════════════════════════════
   MOBILE
═══════════════════════════════════════════ */
.mobile-bar {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  background: var(--bg1);
  border-bottom: 1px solid var(--border);
  z-index: 300;
  align-items: center;
  padding: 0 16px;
  gap: 14px;
}

.menu-toggle {
  background: var(--glass2);
  border: 1px solid var(--border2);
  color: var(--text2);
  padding: 7px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
}

.mobile-logo {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}

@media (max-width: 960px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .mobile-bar { display: flex; }
  .main { margin-left: 0; padding-top: 52px; }
  footer { margin-left: 0; padding: 24px; }
  .hero { padding: 48px 24px; min-height: auto; }
  .doc-section { padding: 48px 24px; }
  .bento-section { padding: 40px 24px; }
  .bento-grid { grid-template-columns: 1fr; }
  .bc-what, .bc-stack, .bc-time, .bc-prereq { grid-column: span 1; }
  .account-strip { grid-template-columns: 1fr; }
  .split-panel { grid-template-columns: 1fr; }
  .hero-stats { flex-direction: column; width: 100%; }
  .stat { border-right: none; border-bottom: 1px solid var(--border); }
  .stat:last-child { border-bottom: none; }
  .finale { padding: 48px 24px; }
}

/* ═══════════════════════════════════════════
   SMALL MOBILE FIXES (overflow prevention)
═══════════════════════════════════════════ */
@media (max-width: 600px) {
  .doc-section { padding: 40px 16px; }
  .step-item { grid-template-columns: 44px 1fr; gap: 0 12px; }
  .code-block pre { padding: 14px; font-size: 12px; }

  /* Env variable rows: stack instead of a fixed-width horizontal row */
  .env-row { flex-direction: column; align-items: stretch; }
  .env-key { min-width: 0; border-right: none; border-bottom: 1px solid var(--border2); }
  .env-arrow { display: none; }
  .env-val { padding: 10px 18px; }
  .env-all { border-left: none; border-top: 1px solid var(--border); justify-content: flex-end; }

  /* Flowchart: drop the fixed min-width and stack the YES/NO branches */
  .flowchart { padding: 20px 14px; }
  .flowchart-inner { min-width: 0; width: 100%; }
  .fc-node { width: 100%; max-width: 280px; font-size: 12.5px; padding: 10px 16px; }
  .fc-branches { flex-direction: column; align-items: center; gap: 18px; }
  .fc-branch-col { width: 100%; }
  .fc-branch-yes .fc-branch-connector,
  .fc-branch-no .fc-branch-connector,
  .fc-branch-yes .fc-branch-drop,
  .fc-branch-no .fc-branch-drop { margin-left: auto; margin-right: auto; }
  .fc-branch-label-row { justify-content: center; padding: 0; }
  .fc-branch-yes .fc-branch-node,
  .fc-branch-no .fc-branch-node,
  .fc-branch-check { width: 100%; max-width: 280px; margin-left: auto; margin-right: auto; }
  .fc-check { width: auto; height: auto; min-height: 56px; border-radius: 16px; padding: 12px 20px; }
}

/* ═══════════════════════════════════════════
   ANIMATIONS
═══════════════════════════════════════════ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

@keyframes arrowPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 0.8; }
}


/* ═══════════════════════════════════════════
   MULTI-PAGE SITE CHROME (v3.0 additions)
═══════════════════════════════════════════ */

/* Sidebar section link style for multi-page nav */
.nav-item.current { color: var(--cyan); border-left-color: var(--cyan); background: rgba(109,94,245,0.06); }
.nav-item.current .nav-dot { background: var(--cyan); box-shadow: 0 0 6px var(--cyan); }

.nav-section-link {
  display: block;
  padding: 8px 20px 8px 34px;
  font-size: 11.5px;
  color: var(--text3);
  text-decoration: none;
  border-left: 2px solid transparent;
}
.nav-section-link:hover { color: var(--text2); text-decoration: none; background: var(--glass2); }
.nav-section-link.active { color: var(--cyan); font-weight: 600; }

/* ── Page header (replaces in-page section-eyebrow context on subpages) ── */
.page-hero {
  padding: 56px 64px 24px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(109,94,245,0.04), transparent);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text3);
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--text3); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb .sep { opacity: 0.5; }

/* ── Prev / Next page navigation footer ── */
.page-pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 40px 64px 20px;
  flex-wrap: wrap;
}
.pager-link {
  flex: 1;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 22px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  transition: all 0.2s;
  text-decoration: none;
}
.pager-link:hover { border-color: var(--border3); box-shadow: var(--shadow-card); text-decoration: none; transform: translateY(-2px); }
.pager-link.next { text-align: right; align-items: flex-end; margin-left: auto; }
.pager-eyebrow { font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text3); }
.pager-title { font-family: var(--font-display); font-weight: 700; font-size: 15px; color: var(--text); }

/* ── Homepage hub grid (links to each page) ── */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding: 0 64px 64px;
}
.hub-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  text-decoration: none;
  color: inherit;
  transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
  position: relative;
  overflow: hidden;
}
.hub-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--grad-main);
  opacity: 0;
  transition: opacity 0.25s;
  z-index: 0;
}
.hub-card:hover { transform: translateY(-4px); border-color: var(--border3); box-shadow: 0 12px 32px rgba(109,94,245,0.14); text-decoration: none; }
.hub-card > * { position: relative; z-index: 1; }
.hub-part {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--cyan);
  font-weight: 700;
}
.hub-icon { font-size: 26px; }
.hub-title { font-family: var(--font-display); font-weight: 700; font-size: 17px; color: var(--text); }
.hub-desc { font-size: 13px; color: var(--text2); line-height: 1.55; }
.hub-meta { margin-top: auto; padding-top: 10px; font-family: var(--font-mono); font-size: 10.5px; color: var(--text3); display: flex; justify-content: space-between; align-items: center; border-top: 1px dashed var(--border); }

@media (max-width: 1100px) { .hub-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 700px) {
  .hub-grid { grid-template-columns: 1fr; padding: 0 20px 48px; }
  .page-hero { padding: 40px 20px 20px; }
  .page-pager { padding: 32px 20px 12px; flex-direction: column; }
  .pager-link.next { margin-left: 0; align-items: flex-start; text-align: left; }
}

/* ── Search box in sidebar ── */
.sidebar-search {
  margin: 14px 20px 4px;
  position: relative;
}
.sidebar-search input {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 12px 8px 30px;
  font-size: 12px;
  font-family: var(--font-body);
  color: var(--text);
  outline: none;
}
.sidebar-search input:focus { border-color: var(--border3); }
.sidebar-search .s-icon { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); font-size: 12px; color: var(--text3); pointer-events: none; }

/* ── Back to top button ── */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--text);
  color: var(--bg1);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(20,21,26,0.2);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
  z-index: 300;
  border: none;
}
.back-to-top.show { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); }

/* ── Updated banner note ── */
.freshness-note {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text3);
  margin-top: 6px;
}

/* dark-mode toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 14px 20px 0;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface2);
  cursor: pointer;
  font-size: 11.5px;
  color: var(--text2);
  font-family: var(--font-mono);
  user-select: none;
}
.theme-toggle:hover { border-color: var(--border3); }

html.dark {
  --bg: #0b0c10;
  --bg1: #121317;
  --bg2: #16171d;
  --bg3: #1b1c23;
  --surface: #121317;
  --surface2: #16171d;
  --glass: rgba(255,255,255,0.03);
  --glass2: rgba(255,255,255,0.05);
  --text: #f2f3f6;
  --text2: #aab0c0;
  --text3: #767d8c;
  --border: rgba(255,255,255,0.08);
  --border2: rgba(255,255,255,0.13);
}