:root {
  --ink: #12141a;
  --ink-soft: #2e333d;
  --mute: #5c6470;
  --line: rgba(18, 20, 26, 0.12);
  --white: #fafbfc;
  --surface: #eef1f4;
  --accent: #1a5c4a;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  font-family: "Figtree", sans-serif;
  color: var(--ink);
  background: #e6eaee;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 55% at 85% 35%, rgba(26, 92, 74, 0.1), transparent 55%),
    radial-gradient(ellipse 55% 45% at 8% 70%, rgba(100, 120, 150, 0.1), transparent 50%),
    linear-gradient(160deg, #f2f4f6 0%, #e4e9ee 50%, #d5dde5 100%);
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.28;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px;
  mix-blend-mode: multiply;
  pointer-events: none;
}

/* —— Header —— */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(1.25rem, 4vw, 3.5rem);
  background: rgba(238, 241, 244, 0.72);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  animation: fade-down 0.7s var(--ease) both;
  transition: border-color 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
}

.brand-mark img {
  display: block;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}

.auth-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* —— Buttons —— */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "Figtree", sans-serif;
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  border: 1px solid transparent;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease), transform 0.2s var(--ease);
  cursor: pointer;
  white-space: nowrap;
}

.btn-ghost {
  color: var(--ink);
  background: rgba(250, 251, 252, 0.45);
  border-color: var(--line);
}

.btn-ghost:hover {
  background: rgba(250, 251, 252, 0.8);
  border-color: rgba(18, 20, 26, 0.28);
}

.btn-solid {
  color: var(--white);
  background: var(--ink);
  border-color: var(--ink);
}

.btn-solid:hover {
  background: #000;
  transform: translateY(-1px);
}

.btn-lg {
  padding: 0.8rem 1.4rem;
  font-size: 0.9375rem;
}

/* —— Hero —— */
.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: calc(100dvh - 4.5rem);
  padding: 0 clamp(1.25rem, 4vw, 3.5rem) clamp(3rem, 8vh, 5rem);
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 28rem;
  animation: fade-up 0.9s var(--ease) 0.15s both;
}

.headline {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 0.85rem;
}

.lede {
  font-size: 1.0625rem;
  line-height: 1.55;
  color: var(--mute);
  max-width: 34ch;
  margin-bottom: 1.85rem;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.scroll-hint {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 22px;
  height: 36px;
  border: 1.5px solid rgba(18, 20, 26, 0.28);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 7px;
  z-index: 1;
  animation: fade-up 1s var(--ease) 0.8s both;
}

.scroll-hint span {
  width: 3px;
  height: 7px;
  border-radius: 2px;
  background: var(--ink);
  animation: scroll-dot 1.6s var(--ease) infinite;
}

/* —— Features —— */
.features {
  position: relative;
  background: var(--surface);
  border-top: 1px solid var(--line);
  padding: clamp(4rem, 10vh, 7rem) clamp(1.25rem, 4vw, 3.5rem);
}

.features-inner {
  max-width: 860px;
  margin: 0 auto;
}

.features-header {
  margin-bottom: clamp(2.5rem, 6vh, 4rem);
  max-width: 28rem;
}

.features-header h2 {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  font-size: clamp(2rem, 4.5vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

.features-header p {
  font-size: 1.0625rem;
  line-height: 1.5;
  color: var(--mute);
}

.feature-list {
  list-style: none;
}

.feature-list li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  padding: 1.65rem 0;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}

.feature-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.feature-list li.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.feature-index {
  font-family: "Syne", sans-serif;
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  padding-top: 0.2rem;
}

.feature-list h3 {
  font-family: "Syne", sans-serif;
  font-weight: 650;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.4rem;
}

.feature-list p {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--mute);
  max-width: 48ch;
}

/* —— Footer —— */
.site-footer {
  display: flex;
  justify-content: space-between;
  padding: 1.5rem clamp(1.25rem, 4vw, 3.5rem);
  border-top: 1px solid var(--line);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--mute);
  text-transform: uppercase;
  background: var(--surface);
}

.site-footer span:first-child {
  font-family: "Syne", sans-serif;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.08em;
}

@keyframes scroll-dot {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  70% {
    opacity: 0;
    transform: translateY(10px);
  }
  100% {
    opacity: 0;
    transform: translateY(0);
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-down {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 640px) {
  .feature-list li {
    grid-template-columns: 2.5rem 1fr;
    gap: 0.75rem;
  }

  .hero-copy {
    max-width: 100%;
  }
}

@media (max-width: 420px) {
  .auth-nav .btn {
    padding: 0.45rem 0.7rem;
    font-size: 0.8125rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .feature-list li {
    opacity: 1;
    transform: none;
  }
}