:root {
  --ink: #102018;
  --ink-soft: #2a3d34;
  --muted: #5c7268;
  --line: rgba(16, 32, 24, 0.12);
  --paper: #f3f7f4;
  --paper-2: #e7f0ea;
  --mint: #1f9d6c;
  --mint-deep: #147a52;
  --mint-soft: #d8f3e6;
  --sun: #e8f56d;
  --shadow: 0 18px 50px rgba(16, 32, 24, 0.08);
  --radius: 18px;
  --font-display: "Syne", sans-serif;
  --font-body: "Figtree", sans-serif;
  --max: 1180px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  background: var(--paper);
  min-height: 100vh;
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 55% at 12% -10%, rgba(31, 157, 108, 0.18), transparent 55%),
    radial-gradient(ellipse 60% 45% at 92% 8%, rgba(232, 245, 109, 0.28), transparent 50%),
    linear-gradient(180deg, #eef6f1 0%, var(--paper) 38%, #eaf3ee 100%);
}

.page-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(16, 32, 24, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 32, 24, 0.035) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, #000 0%, transparent 70%);
}

a {
  color: var(--mint-deep);
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--mint-soft);
  padding: 0.1em 0.4em;
  border-radius: 6px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 28px;
  backdrop-filter: blur(12px);
  background: rgba(243, 247, 244, 0.82);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
}

.brand img {
  border-radius: 7px;
}

.brand em {
  font-style: normal;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mint-deep);
  background: var(--sun);
  padding: 3px 8px;
  border-radius: 6px;
}

.nav {
  display: flex;
  gap: 18px;
  margin-left: auto;
}

.nav a,
.top-link {
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
}

.top-link {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  max-width: var(--max);
  margin: 0 auto;
  padding: 36px 28px 20px;
  min-height: auto;
}

.hero-brand {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 0.95;
  animation: rise 0.7s ease both;
}

.hero h1 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  animation: rise 0.7s ease 0.08s both;
}

.hero-lead {
  margin: 0 0 22px;
  max-width: 46ch;
  color: var(--muted);
  font-size: 1.12rem;
  animation: rise 0.7s ease 0.16s both;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  animation: rise 0.7s ease 0.24s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 12px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn.primary {
  background: var(--ink);
  color: #f4faf6;
}

.btn.primary:hover {
  background: #1a3228;
}

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn-text {
  border: 0;
  background: none;
  color: var(--muted);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.hero-visual {
  min-height: 300px;
  display: grid;
  place-items: center;
  animation: fade-in 0.9s ease 0.2s both;
}

.hero-plane {
  position: relative;
  width: min(100%, 460px);
  aspect-ratio: 1.05;
}

.plane-grid {
  position: absolute;
  inset: 4% 2%;
  border-radius: 28px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.75), rgba(216, 243, 230, 0.55)),
    repeating-linear-gradient(
      -18deg,
      transparent,
      transparent 14px,
      rgba(31, 157, 108, 0.07) 14px,
      rgba(31, 157, 108, 0.07) 15px
    );
  border: 1px solid rgba(16, 32, 24, 0.08);
  box-shadow: var(--shadow);
  animation: float-y 6s ease-in-out infinite;
}

.plane-orb {
  position: absolute;
  width: 120px;
  height: 120px;
  right: 6%;
  bottom: 10%;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--sun), var(--mint) 70%);
  opacity: 0.9;
  animation: float-y 5s ease-in-out 0.6s infinite;
}

.plane-card {
  position: absolute;
  display: grid;
  gap: 4px;
  min-width: 120px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(16, 32, 24, 0.08);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(16, 32, 24, 0.06);
  animation: float-y 5.5s ease-in-out infinite;
}

.plane-card span {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--mint);
  letter-spacing: 0.04em;
}

.plane-card strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.plane-card.c1 {
  top: 18%;
  left: 10%;
  animation-delay: 0.2s;
}

.plane-card.c2 {
  top: 42%;
  right: 8%;
  animation-delay: 0.8s;
}

.plane-card.c3 {
  bottom: 18%;
  left: 22%;
  animation-delay: 1.2s;
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 52px 28px 20px;
}

.section-head {
  max-width: 44rem;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mint-deep);
}

.section-head h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  color: var(--muted);
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 22px;
  padding: 26px 28px 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  animation: rise 0.55s ease both;
  animation-delay: calc(var(--i) * 0.05s);
}

.step-num {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--ink);
  color: #f4faf6;
  font-family: var(--font-display);
  font-weight: 800;
}

.step-body h3 {
  margin: 4px 0 12px;
  font-family: var(--font-display);
  font-size: 1.25rem;
}

.mini {
  margin: 0;
  padding-left: 1.15rem;
  display: grid;
  gap: 6px;
  color: var(--ink-soft);
}

.note,
.tip {
  margin: 12px 0 0;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.95rem;
}

.note {
  background: rgba(232, 245, 109, 0.35);
  color: var(--ink-soft);
}

.tip {
  background: var(--mint-soft);
  color: var(--ink-soft);
}

.checklist-section {
  padding-bottom: 48px;
}

.progress-bar {
  margin-bottom: 28px;
}

.progress-track {
  height: 10px;
  border-radius: 999px;
  background: rgba(16, 32, 24, 0.08);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--mint), #3bc48a);
  border-radius: inherit;
  transition: width 0.35s ease;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
}

.checklist-groups {
  display: grid;
  gap: 18px;
}

.check-group {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  overflow: hidden;
}

.check-group > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
}

.check-group > summary::-webkit-details-marker {
  display: none;
}

.check-group > summary::after {
  content: "";
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--ink-soft);
  border-bottom: 2px solid var(--ink-soft);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  flex: 0 0 auto;
}

.check-group[open] > summary::after {
  transform: rotate(225deg);
}

.group-count {
  margin-left: auto;
  margin-right: 12px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--mint-deep);
  background: var(--mint-soft);
  padding: 4px 10px;
  border-radius: 999px;
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 0 12px 14px;
  display: grid;
  gap: 6px;
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 10px;
  border-radius: 12px;
  cursor: pointer;
  transition: background 0.15s ease;
}

.check-item:hover {
  background: rgba(216, 243, 230, 0.45);
}

.check-item input {
  appearance: none;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  flex: 0 0 auto;
  border: 2px solid rgba(16, 32, 24, 0.28);
  border-radius: 7px;
  background: #fff;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.check-item input:checked {
  background: var(--mint);
  border-color: var(--mint);
}

.check-item input:checked::after {
  content: "";
  width: 6px;
  height: 10px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translate(-1px, -1px);
}

.check-item span {
  color: var(--ink-soft);
}

.check-item.is-done span {
  color: var(--muted);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.help-grid article {
  padding: 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.55);
}

.help-grid h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.1rem;
}

.help-grid p {
  margin: 0;
  color: var(--muted);
}

.footer {
  max-width: var(--max);
  margin: 40px auto 0;
  padding: 24px 28px 40px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-weight: 600;
}

.footer a {
  text-decoration: none;
  color: var(--ink-soft);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes float-y {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@media (max-width: 860px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 24px;
    gap: 20px;
  }

  .hero-visual {
    min-height: 240px;
    order: -1;
  }

  .hero-plane {
    width: min(100%, 340px);
  }

  .nav {
    display: none;
  }

  .help-grid {
    grid-template-columns: 1fr;
  }

  .step {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .topbar {
    padding: 12px 16px;
  }

  .hero,
  .section,
  .footer {
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}