:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --ink: #17202a;
  --muted: #627182;
  --panel: #ffffff;
  --soft: #edf2f7;
  --line: #d9e1ea;
  --teal: #0f8f7f;
  --blue: #2f80ed;
  --orange: #f28b2e;
  --green: #4f8f52;
  --red: #b42318;
  --shadow: 0 18px 48px rgba(20, 36, 52, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
}

h1,
h2,
h3,
p {
  margin: 0;
  letter-spacing: 0;
}

.site-header {
  background:
    linear-gradient(118deg, rgba(15, 143, 127, 0.15), transparent 42%),
    linear-gradient(180deg, #ffffff 0%, #edf3f8 100%);
  border-bottom: 1px solid var(--line);
}

.nav,
.hero,
main {
  width: min(1220px, calc(100vw - 32px));
  margin: 0 auto;
}

.nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  padding: 12px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 900;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, var(--teal) 0 50%, transparent 50%),
    linear-gradient(135deg, transparent 0 46%, var(--orange) 46% 58%, transparent 58%),
    #203348;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.nav-links a:hover {
  color: var(--ink);
}

.hero {
  min-height: 590px;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(380px, 0.92fr);
  align-items: center;
  gap: 44px;
  padding: 58px 0 70px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
}

h1 {
  max-width: 820px;
  font-size: clamp(42px, 5vw, 66px);
  line-height: 1.05;
  font-weight: 950;
}

h2 {
  font-size: clamp(28px, 3vw, 38px);
  line-height: 1.14;
  font-weight: 920;
}

h3 {
  font-size: 19px;
  line-height: 1.25;
  font-weight: 900;
}

.lead {
  margin-top: 18px;
  max-width: 760px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.8;
}

.hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.primary,
.secondary,
button {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 16px;
  font-weight: 850;
  cursor: pointer;
}

.primary {
  background: var(--teal);
  border-color: var(--teal);
  color: #ffffff;
}

.secondary,
button {
  background: #ffffff;
  color: var(--ink);
}

.primary:hover,
.secondary:hover,
button:hover {
  transform: translateY(-1px);
}

.hero-console,
.start-grid article,
.pipeline article,
.comparison-grid article,
.metric,
.ai-board article,
.teacher-panel,
.preview-card,
.chart-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.hero-console {
  overflow: hidden;
}

.console-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 20px;
  border-bottom: 1px solid var(--line);
  background: #fbfcfe;
}

.console-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-size: 13px;
  font-weight: 900;
}

.status.online {
  color: #087664;
  background: #e9fbf5;
  border-color: #9bddcf;
}

.status.waiting {
  color: #9a5a00;
  background: #fff5de;
  border-color: #efc77b;
}

.signal-dot {
  width: 12px;
  height: 12px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 8px rgba(15, 143, 127, 0.12);
}

.signal-list {
  padding: 0 20px;
}

.signal-line,
.state-list div,
.teacher-panel div,
.compact-stats div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.signal-line:last-child,
.state-list div:last-child,
.teacher-panel div:last-child,
.compact-stats div:last-child {
  border-bottom: 0;
}

.signal-line span,
.state-list span,
.metric span,
.teacher-panel span,
.compact-stats span {
  color: var(--muted);
  font-weight: 760;
}

.signal-line strong,
.state-list strong,
.teacher-panel strong,
.compact-stats strong {
  text-align: right;
}

.apparatus {
  position: relative;
  min-height: 250px;
  margin: 0 20px 20px;
  border: 1px solid #cfd8e3;
  border-radius: 8px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.58) 1px, transparent 1px) 0 0 / 28px 28px,
    linear-gradient(0deg, rgba(255, 255, 255, 0.58) 1px, transparent 1px) 0 0 / 28px 28px,
    radial-gradient(circle at 58% 28%, rgba(255, 255, 255, 0.82), transparent 34%),
    #dfe8f2;
}

.phone-shell {
  position: absolute;
  left: 22px;
  top: 30px;
  width: 84px;
  height: 154px;
  border-radius: 20px;
  background: #203348;
  box-shadow: 0 18px 30px rgba(32, 51, 72, 0.22);
}

.phone-shell span {
  position: absolute;
  inset: 14px 9px;
  border-radius: 14px;
  background: linear-gradient(180deg, #96d5ca, #2f80ed);
}

.phone-shell strong {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 28px;
  text-align: center;
  color: #ffffff;
  font-size: 20px;
}

.cylinder {
  position: absolute;
  left: 48%;
  top: 30px;
  width: 78px;
  height: 184px;
  transform: translateX(-50%);
  border: 2px solid rgba(94, 174, 232, 0.42);
  border-top-color: rgba(255, 255, 255, 0.76);
  border-bottom-color: rgba(38, 68, 94, 0.38);
  border-radius: 42px / 18px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.28), transparent 12% 82%, rgba(255, 255, 255, 0.24)),
    linear-gradient(180deg, rgba(133, 204, 255, 0.035), rgba(80, 175, 205, 0.09));
  box-shadow:
    inset 10px 0 14px rgba(255, 255, 255, 0.18),
    inset -10px 0 18px rgba(21, 62, 88, 0.10),
    0 14px 24px rgba(24, 50, 72, 0.16);
}

.cylinder::before,
.cylinder::after {
  content: "";
  position: absolute;
  left: -3px;
  right: -3px;
  height: 26px;
  border: 2px solid rgba(255, 255, 255, 0.78);
  border-radius: 50%;
}

.cylinder::before {
  top: -12px;
  background: rgba(255, 255, 255, 0.32);
}

.cylinder::after {
  bottom: -12px;
  background: rgba(12, 27, 39, 0.08);
}

.lab-rig {
  position: absolute;
  left: 36%;
  top: 18px;
  width: 130px;
  height: 214px;
}

.rail,
.top-plate,
.bottom-plate,
.cradle {
  position: absolute;
  display: block;
}

.rail {
  top: 0;
  bottom: 18px;
  width: 18px;
  border-radius: 7px;
  background: linear-gradient(90deg, #8ea9ba, #c7dde9 42%, #678498);
  box-shadow: inset -4px 0 10px rgba(24, 45, 59, 0.28);
}

.rail-left { left: 0; }
.rail-right { right: 0; }

.top-plate {
  left: -6px;
  right: -6px;
  top: -4px;
  height: 18px;
  border-radius: 7px;
  background: linear-gradient(180deg, #20242b, #0f1217);
}

.bottom-plate {
  left: 4px;
  right: 4px;
  bottom: 0;
  height: 30px;
  border-radius: 6px 6px 0 0;
  background: linear-gradient(180deg, #24272e, #0d1015);
}

.cradle {
  left: 37px;
  bottom: 24px;
  width: 56px;
  height: 28px;
  border-radius: 0 0 42px 42px;
  background: linear-gradient(180deg, #20242a, #06080b);
  box-shadow: inset 0 8px 12px rgba(255, 255, 255, 0.08);
}

.cradle::before,
.cradle::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
}

.cradle::before {
  top: 18px;
  width: 64px;
  height: 34px;
  border-radius: 0 0 50% 50%;
  background:
    radial-gradient(ellipse at 50% 8%, rgba(255, 255, 255, 0.76), transparent 34%),
    rgba(158, 217, 245, 0.25);
  border-bottom: 2px solid rgba(236, 252, 255, 0.72);
}

.cradle::after {
  top: -4px;
  width: 78px;
  height: 22px;
  border-radius: 4px 4px 16px 16px;
  background: linear-gradient(180deg, #20242a, #040507);
  box-shadow: 0 8px 12px rgba(4, 5, 7, 0.34);
}

.water,
.oil,
.glass-shine,
.bath-arc {
  position: absolute;
  display: block;
  pointer-events: none;
}

.water {
  left: 7px;
  right: 7px;
  top: 30px;
  bottom: 16px;
  border-radius: 36px / 16px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.14), transparent 22% 82%, rgba(255, 255, 255, 0.15)),
    rgba(89, 180, 226, 0.06);
  box-shadow:
    inset 9px 0 16px rgba(255, 255, 255, 0.12),
    inset -8px 0 14px rgba(34, 112, 158, 0.10);
}

.oil {
  left: 26px;
  right: 26px;
  top: 42px;
  bottom: 22px;
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: 18px / 9px;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.24), transparent 42%),
    rgba(238, 224, 139, 0.20);
}

.oil::before,
.water::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 10px;
  height: 11px;
  border-radius: 50%;
  border-top: 2px solid rgba(255, 255, 255, 0.80);
}

.oil::after,
.water::after {
  content: "";
  position: absolute;
  left: 2px;
  right: 2px;
  bottom: 8px;
  height: 13px;
  border-radius: 0 0 50% 50%;
  border-bottom: 2px solid rgba(255, 255, 255, 0.62);
}

.bath-arc {
  left: 50%;
  border-radius: 0 0 50% 50%;
  transform: translateX(-50%);
}

.arc-outer {
  bottom: -10px;
  width: 78px;
  height: 28px;
  border-bottom: 3px solid rgba(235, 252, 255, 0.90);
  border-left: 2px solid rgba(235, 252, 255, 0.44);
  border-right: 2px solid rgba(235, 252, 255, 0.44);
  filter: drop-shadow(0 0 6px rgba(136, 221, 255, 0.30));
}

.arc-water {
  bottom: -5px;
  width: 66px;
  height: 22px;
  border-bottom: 2px solid rgba(116, 210, 255, 0.48);
}

.arc-oil {
  bottom: 2px;
  width: 39px;
  height: 16px;
  border-bottom: 2px solid rgba(255, 239, 151, 0.72);
}

.shine-a {
  left: 16px;
  top: 8px;
  width: 5px;
  height: 166px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.40);
  filter: blur(0.4px);
}

.shine-b {
  right: 15px;
  top: 20px;
  width: 3px;
  height: 144px;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.26);
}

.ball {
  position: absolute;
  left: 50%;
  top: 48%;
  width: 26px;
  height: 26px;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ffffff, #f28b2e 35%, #a94312 100%);
  box-shadow: 0 8px 18px rgba(169, 67, 18, 0.28);
}

.tick {
  position: absolute;
  right: 10px;
  width: 34px;
  height: 2px;
  background: rgba(255, 255, 255, 0.72);
}

.tick-a { top: 34px; }
.tick-b { top: 88px; }
.tick-c { top: 142px; }

.pid-unit {
  position: absolute;
  right: 8px;
  bottom: 12px;
  width: 184px;
  height: 166px;
  border-radius: 8px 8px 6px 6px;
  background:
    linear-gradient(90deg, #171b20 0 13px, transparent 13px calc(100% - 13px), #171b20 calc(100% - 13px)),
    linear-gradient(180deg, #d0cdbb, #aaa895);
  box-shadow: 0 22px 32px rgba(31, 43, 55, 0.20);
}

.pid-title,
.pid-brand,
.pid-screen,
.pid-led,
.pid-level,
.pid-button,
.pid-power,
.pid-label {
  position: absolute;
  display: block;
}

.pid-title {
  left: 20px;
  top: 16px;
  color: #253241;
  font-size: 14px;
  font-weight: 900;
}

.pid-brand {
  right: 16px;
  top: 16px;
  color: #9b2533;
  font-size: 12px;
  font-weight: 900;
}

.pid-screen {
  left: 48px;
  top: 44px;
  width: 112px;
  height: 62px;
  padding: 7px 8px;
  border-radius: 3px;
  background: #9dbdff;
  color: #18304d;
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
  line-height: 1.45;
  box-shadow: 0 0 18px rgba(91, 128, 255, 0.58);
}

.pid-led {
  right: 28px;
  top: 40px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #d9ffe1, #4bdf60 46%, #177f2b 100%);
  box-shadow: 0 0 10px rgba(76, 223, 96, 0.70);
}

.pid-level {
  left: 18px;
  top: 50px;
  width: 12px;
  height: 88px;
  border: 2px solid rgba(255, 255, 255, 0.72);
  border-radius: 10px;
  background: linear-gradient(180deg, transparent 34%, rgba(109, 196, 224, 0.62) 34%);
}

.pid-button {
  bottom: 26px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: linear-gradient(145deg, #3b91d0, #195b98);
  box-shadow: inset 0 2px 4px rgba(255, 255, 255, 0.34);
  cursor: pointer;
  transition: transform 120ms ease, filter 120ms ease;
}

.pid-button:focus-visible,
.pid-power:focus-visible {
  outline: 2px solid rgba(35, 158, 231, 0.70);
  outline-offset: 2px;
}

.pid-button.is-pressed,
.pid-power.is-pressed {
  transform: translateY(2px);
  filter: brightness(1.18);
}

.pid-button.b-start {
  left: 58px;
  width: 25px;
  height: 25px;
}

.pid-button.b-up { left: 104px; bottom: 53px; }
.pid-button.b-down { left: 104px; bottom: 14px; }
.pid-button.b-left { left: 84px; }
.pid-button.b-right { left: 124px; }

.pid-power {
  right: 24px;
  bottom: 26px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: linear-gradient(145deg, #ee5a58, #a51d22);
  cursor: pointer;
  transition: transform 120ms ease, filter 120ms ease;
}

.pid-label {
  color: #253241;
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 8px;
  font-weight: 800;
  line-height: 1;
}

.l-run { left: 58px; bottom: 12px; }
.l-pwr { right: 18px; bottom: 12px; }
.l-up { left: 110px; bottom: 76px; }
.l-down { left: 110px; bottom: 3px; }
.l-left { left: 75px; bottom: 35px; }
.l-right { left: 151px; bottom: 35px; }

.water-line {
  position: absolute;
  left: 50%;
  right: 166px;
  height: 18px;
  border-top: 5px solid rgba(229, 224, 202, 0.86);
  border-right: 5px solid rgba(229, 224, 202, 0.86);
  border-radius: 42px 18px 0 0;
  filter: drop-shadow(0 3px 4px rgba(70, 90, 110, 0.18));
}

.line-hot {
  top: 72px;
}

.line-return {
  top: 132px;
  transform: scaleY(-1);
}

main {
  padding: 42px 0 70px;
  display: grid;
  gap: 48px;
}

.section {
  scroll-margin-top: 18px;
}

.section-head {
  margin-bottom: 20px;
}

.section-head p,
.section-copy {
  max-width: 800px;
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.75;
}

.section-head.inline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 22px;
}

.start-grid,
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.pipeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.start-grid article,
.pipeline article,
.comparison-grid article,
.ai-board article {
  min-width: 0;
  padding: 20px;
  box-shadow: none;
}

.start-grid p,
.pipeline p,
.comparison-grid p,
.ai-board p {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.65;
}

code {
  display: block;
  margin-top: 16px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #eef3f8;
  color: #233142;
  font-size: 13px;
  overflow-wrap: anywhere;
}

.tag,
.pipeline span,
.legend {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 900;
}

.tag.windows,
.line-card.experiment span { color: var(--blue); }
.tag.ios { color: var(--teal); }
.tag.comsol,
.line-card.cfd span { color: #c56512; }
.tag.cloud,
.line-card.theory span { color: var(--green); }

.compact-stats {
  flex: 0 0 340px;
  display: grid;
  grid-template-columns: 1fr;
  padding: 2px 16px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.patrol-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 16px;
  align-items: start;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  min-width: 900px;
  border-collapse: collapse;
}

th,
td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

th {
  color: #3b4a5a;
  background: #f1f5f9;
  font-size: 13px;
}

td {
  color: #243244;
  font-size: 14px;
}

tbody tr:last-child td {
  border-bottom: 0;
}

.table-status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 900;
}

.table-status.ok {
  color: #087664;
  background: #e9fbf5;
}

.table-status.warn {
  color: #9a5a00;
  background: #fff5de;
}

.teacher-panel {
  padding: 4px 18px;
  box-shadow: none;
}

.pipeline article {
  position: relative;
  min-height: 190px;
}

.pipeline span {
  color: var(--blue);
}

.pipeline article:nth-child(2) span {
  color: var(--teal);
}

.pipeline article:nth-child(3) span {
  color: var(--orange);
}

.pipeline article:nth-child(4) span {
  color: var(--green);
}

.pipeline article:nth-child(5) span {
  color: #805ad5;
}

.line-card {
  position: relative;
  min-height: 172px;
  overflow: hidden;
}

.line-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--line);
}

.line-card.experiment::before { background: var(--blue); }
.line-card.theory::before { background: #7f8ca1; }
.line-card.cfd::before { background: var(--orange); }

.split {
  display: grid;
  grid-template-columns: minmax(320px, 0.85fr) minmax(0, 1.15fr);
  gap: 20px;
  align-items: start;
}

.ai-board {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 18px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  min-width: 0;
  padding: 16px;
  box-shadow: none;
}

.metric strong {
  display: block;
  margin-top: 8px;
  font-size: 21px;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.metric.wide {
  grid-column: span 3;
}

.live-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.32fr) minmax(340px, 0.68fr);
  gap: 16px;
}

.preview-card,
.chart-card {
  padding: 18px;
  box-shadow: none;
}

.preview-tools {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
  color: var(--muted);
  font-weight: 750;
}

.preview-tools div {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.preview-stage {
  position: relative;
  min-height: 560px;
  overflow: hidden;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #07111c;
}

.preview-stage.webrtc-only {
  display: block;
  padding: 0;
}

#webrtcPreview {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: #07111c;
}

#liveFrame,
#overlay {
  position: absolute;
  left: 50%;
  top: 50%;
  display: none;
  transform-origin: center;
}

#overlay {
  pointer-events: none;
}

.empty {
  color: rgba(255, 255, 255, 0.68);
  font-weight: 850;
}

.preview-stage.webrtc-only .empty {
  display: none;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #203348;
  color: #ffffff;
  font-size: 13px;
  font-weight: 850;
}

canvas {
  width: 100%;
  height: 300px;
  display: block;
  border-radius: 8px;
  background: #0a1724;
}

.state-list {
  margin-top: 14px;
}

@media (max-width: 1120px) {
  .hero,
  .section-head.inline,
  .patrol-layout,
  .split,
  .live-layout {
    grid-template-columns: 1fr;
  }

  .compact-stats {
    flex-basis: auto;
    width: 100%;
  }

  .start-grid,
  .comparison-grid,
  .pipeline,
  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .metric.wide {
    grid-column: span 2;
  }
}

@media (max-width: 720px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    justify-content: flex-start;
  }

  .hero {
    padding: 36px 0 48px;
  }

  .start-grid,
  .comparison-grid,
  .pipeline,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .metric.wide {
    grid-column: span 1;
  }

  .preview-tools {
    flex-direction: column;
  }

  .preview-tools div {
    justify-content: flex-start;
  }

  .preview-stage {
    min-height: 420px;
  }
}