/* ============================================================
   BlindMaster Landing Page — Styles
   Theme: time-based accent (orange / blue / purple)
   matching the Flutter app's time-of-day color system
   ============================================================ */

/* ---------- CSS Custom Properties (set by JS at runtime) --- */
:root {
  --accent: #3B82F6;          /* default: day blue */
  --accent-rgb: 59, 130, 246;
  --accent-dark: #1D4ED8;
  --accent-glow: rgba(59, 130, 246, 0.25);

  --bg: #0A0B0F;
  --bg-surface: #12141A;
  --bg-card: #181B24;
  --bg-card-border: rgba(255,255,255,0.07);

  --text: #F1F5F9;
  --text-muted: #8892A4;
  --text-faint: #4B5563;

  --slat-color: #6B4C2A;
  --slat-shadow: rgba(0,0,0,0.4);

  --transition: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 16px;
  --radius-sm: 10px;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Poppins', sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; border: none; }

/* ---------- Utility ---------------------------------------- */
.section-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
}

.section-header { margin-bottom: 56px; }

/* ---------- Buttons ---------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 24px var(--accent-glow);
}
.btn-primary:hover {
  filter: brightness(1.12);
  box-shadow: 0 0 36px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1.5px solid var(--bg-card-border);
}
.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.04);
}

/* ---------- Scroll reveal ---------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  transition-delay: var(--delay, 0ms);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
}
.nav.scrolled {
  background: rgba(10, 11, 15, 0.85);
  backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06);
}
.nav-inner {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
}
.nav-logo-icon {
  width: 26px;
  height: 22px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  justify-content: center;
}
.nav-logo-icon.small { width: 20px; height: 18px; gap: 3px; }
.slat {
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  transition: background var(--transition);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-cta {
  background: var(--accent) !important;
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 100px;
  font-size: 0.85rem !important;
  transition: filter 0.2s, box-shadow 0.2s !important;
}
.nav-cta:hover { filter: brightness(1.1); }
.nav-launch {
  background: transparent;
  color: var(--text) !important;
  border: 1.5px solid var(--bg-card-border);
  padding: 7px 18px;
  border-radius: 100px;
  font-size: 0.85rem !important;
  transition: border-color 0.2s, background 0.2s !important;
}
.nav-launch:hover {
  border-color: rgba(255,255,255,0.2) !important;
  background: rgba(255,255,255,0.05) !important;
}
.mobile-nav-launch {
  color: var(--accent) !important;
  font-weight: 600 !important;
}
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: 0.3s;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: rgba(10,11,15,0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--bg-card-border);
  z-index: 99;
  padding: 16px 0;
  transform: translateY(-16px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s;
}
.mobile-nav.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
  display: block;
}
.mobile-nav ul { list-style: none; }
.mobile-nav-link {
  display: block;
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
}
.mobile-nav-link:hover { color: var(--text); }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 24px 80px;
  max-width: 1160px;
  margin: 0 auto;
  gap: 48px;
  position: relative;
}
.hero-bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
}
.hero-content {
  flex: 1;
  min-width: 0;
  z-index: 1;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.12);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 28px;
}
.badge-dot {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.hero-accent {
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, #fff));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 500px;
  margin-bottom: 36px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  align-items: center;
  gap: 24px;
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}
.stat-label {
  font-size: 0.72rem;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 4px;
  display: block;
}
.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--bg-card-border);
}

/* ---- Hero visual: window + blind ---- */
.hero-visual {
  flex: 0 0 420px;
  z-index: 1;
}
.window-frame {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 32px 80px rgba(0,0,0,0.5), 0 0 0 1px rgba(255,255,255,0.04) inset;
}
.window-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--bg-card-border);
}
.window-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
}
.window-dot.red   { background: #FF5F57; }
.window-dot.yellow { background: #FEBC2E; }
.window-dot.green  { background: #28C840; }
.window-title {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-left: 8px;
  font-weight: 500;
}
.blind-container {
  height: 220px;
  background: linear-gradient(180deg, #87CEEB 0%, #B0D4F1 100%);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 4px 0;
}
.blind-slat {
  height: 18px;
  background: var(--slat-color);
  border-radius: 2px;
  margin: 0 12px;
  box-shadow: 0 2px 4px var(--slat-shadow);
  transform-origin: center;
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
  transform: rotateX(calc(var(--i, 0) * 0deg));
}
.app-ui-overlay {
  padding: 16px 20px;
}
.app-slider-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.app-slider-track {
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 100px;
  position: relative;
  margin-bottom: 8px;
}
.app-slider-thumb {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(var(--accent-rgb), 0.3);
  transition: left 0.5s cubic-bezier(0.34, 1.56, 0.64, 1), background var(--transition);
  cursor: pointer;
}
.app-slider-vals {
  display: flex;
  justify-content: space-between;
  font-size: 0.65rem;
  color: var(--text-faint);
}

/* ============================================================
   FEATURES
   ============================================================ */
.features {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-surface) 100%);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.25s, box-shadow 0.25s, transform 0.25s;
}
.feature-card:hover {
  border-color: rgba(var(--accent-rgb), 0.35);
  box-shadow: 0 8px 32px rgba(0,0,0,0.3), 0 0 0 1px rgba(var(--accent-rgb), 0.1) inset;
  transform: translateY(-3px);
}
.feature-icon {
  width: 48px; height: 48px;
  background: rgba(var(--accent-rgb), 0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--accent);
  transition: background var(--transition), color var(--transition);
}
.feature-icon svg { width: 22px; height: 22px; }
.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ============================================================
   HOW IT WORKS
   ============================================================ */
.how-it-works {
  padding: 120px 0;
  background: var(--bg-surface);
}

/* Arch flow */
.arch-flow {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 24px;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 8px;
}
.arch-node {
  flex: 1;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius);
  padding: 24px 20px;
  text-align: center;
  transition: border-color 0.25s;
}
.arch-node-center {
  border-color: rgba(var(--accent-rgb), 0.35);
  box-shadow: 0 0 40px rgba(var(--accent-rgb), 0.08);
}
.arch-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  color: var(--accent);
}
.app-icon    { background: rgba(var(--accent-rgb), 0.12); }
.server-icon { background: rgba(var(--accent-rgb), 0.18); }
.device-icon { background: rgba(var(--accent-rgb), 0.12); }
.arch-icon svg { width: 24px; height: 24px; }
.arch-node h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 8px; }
.arch-node p   { font-size: 0.78rem; color: var(--text-muted); line-height: 1.6; }
.arch-tag {
  margin-top: 12px;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  padding: 3px 10px;
  border-radius: 100px;
  display: inline-block;
  font-family: 'Courier New', monospace;
}
.arch-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 0 8px;
  flex-shrink: 0;
}
.arch-arrow-line {
  width: 40px;
  height: 1px;
  background: linear-gradient(90deg, var(--bg-card-border), rgba(var(--accent-rgb), 0.4));
}
.arch-arrow-label {
  font-size: 0.6rem;
  color: var(--text-faint);
  white-space: nowrap;
  letter-spacing: 0.04em;
  writing-mode: horizontal-tb;
}
.arch-ble-note {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-bottom: 56px;
  padding: 10px 16px;
  background: rgba(255,255,255,0.03);
  border-radius: var(--radius-sm);
  border: 1px solid var(--bg-card-border);
  color: var(--text-muted);
}

/* Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.step {
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius);
}
.step-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: rgba(var(--accent-rgb), 0.2);
  line-height: 1;
  margin-bottom: 12px;
  font-variant-numeric: tabular-nums;
}
.step h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 10px; }
.step p   { font-size: 0.85rem; color: var(--text-muted); line-height: 1.65; }

/* ============================================================
   TECH / OPEN HARDWARE
   ============================================================ */
.tech {
  padding: 120px 0;
  background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg) 100%);
}
.tech-content {
  display: flex;
  align-items: center;
  gap: 64px;
  flex-wrap: wrap;
}
.tech-text { flex: 1; min-width: 280px; }
.tech-text .section-title { margin-bottom: 20px; }
.tech-text p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
  margin-bottom: 28px;
}
.tech-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.tech-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.tech-check {
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* Chip visual */
.tech-visual {
  flex: 0 0 280px;
  display: flex;
  justify-content: center;
}
.chip-card {
  position: relative;
  width: 240px;
}
.chip-glow {
  position: absolute;
  inset: -40px;
  background: radial-gradient(ellipse at 50% 50%, rgba(var(--accent-rgb), 0.18) 0%, transparent 70%);
  pointer-events: none;
  transition: background var(--transition);
}
.chip-body {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: 20px;
  padding: 24px 20px;
  text-align: center;
  position: relative;
}
.chip-label {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.chip-sub {
  font-size: 0.7rem;
  color: var(--text-faint);
  letter-spacing: 0.06em;
  margin-bottom: 20px;
}
.chip-pins {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 20px;
}
.chip-pin-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.chip-pin {
  width: 24px;
  height: 7px;
  background: rgba(var(--accent-rgb), 0.35);
  border-radius: 2px;
  transition: background var(--transition);
}
.chip-core {
  flex: 1;
  aspect-ratio: 1;
  background: rgba(var(--accent-rgb), 0.08);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 100px;
  max-height: 100px;
}
.chip-core-inner {
  width: 60%;
  height: 60%;
  background: rgba(var(--accent-rgb), 0.15);
  border-radius: 6px;
  border: 1px solid rgba(var(--accent-rgb), 0.3);
}
.chip-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}
.chip-tags span {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  padding: 3px 8px;
  border-radius: 100px;
  font-family: 'Courier New', monospace;
}

/* ============================================================
   COMING SOON
   ============================================================ */
.coming-soon {
  padding: 120px 0;
  background: var(--bg);
}
.coming-soon-card {
  background: var(--bg-card);
  border: 1px solid rgba(var(--accent-rgb), 0.2);
  border-radius: 24px;
  padding: 64px 56px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 80px rgba(var(--accent-rgb), 0.06);
}
.coming-soon-card::before {
  content: '';
  position: absolute;
  top: -80px; left: 50%;
  transform: translateX(-50%);
  width: 400px; height: 200px;
  background: radial-gradient(ellipse, rgba(var(--accent-rgb), 0.15) 0%, transparent 70%);
  pointer-events: none;
}
.cs-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.12);
  border: 1px solid rgba(var(--accent-rgb), 0.25);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 28px;
}
.cs-badge-dot {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 1.5s infinite;
}
.coming-soon-card h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}
.coming-soon-card > p {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.coming-soon-card strong { color: var(--text); }
.cs-highlights {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.cs-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}
.cs-item svg { color: var(--accent); flex-shrink: 0; }
.cs-form {
  display: flex;
  gap: 10px;
  max-width: 420px;
  margin: 0 auto 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.cs-input {
  flex: 1;
  min-width: 200px;
  background: rgba(255,255,255,0.05);
  border: 1.5px solid var(--bg-card-border);
  border-radius: 100px;
  padding: 13px 20px;
  font-family: inherit;
  font-size: 0.9rem;
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.cs-input::placeholder { color: var(--text-faint); }
.cs-input:focus { border-color: var(--accent); }
.cs-btn { flex-shrink: 0; }
.cs-disclaimer {
  font-size: 0.72rem;
  color: var(--text-faint);
  margin-top: 4px;
}
.cs-success {
  color: #4ADE80;
  font-size: 0.9rem;
  font-weight: 500;
  margin-top: 12px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--bg-card-border);
  padding: 48px 24px;
}
.footer-inner {
  max-width: 1160px;
  margin: 0 auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
}
.footer-tagline {
  font-size: 0.82rem;
  color: var(--text-faint);
}
.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a {
  font-size: 0.82rem;
  color: var(--text-faint);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--text-muted); }
.footer-copy {
  font-size: 0.72rem;
  color: var(--text-faint);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .hero {
    flex-direction: column;
    padding-top: 100px;
    text-align: center;
  }
  .hero-subtitle { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .hero-visual { width: 100%; flex: none; }
  .window-frame { max-width: 380px; margin: 0 auto; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .tech-content { flex-direction: column; }
  .tech-visual { flex: none; width: 100%; }
  .arch-flow { gap: 4px; }
  .arch-arrow-line { width: 24px; }
}

@media (max-width: 600px) {
  .coming-soon-card { padding: 40px 24px; }
  .arch-flow { flex-direction: column; }
  .arch-arrow { flex-direction: row; gap: 8px; }
  .arch-arrow-line { width: 20px; height: 1px; }
}