/* SustainTwin — static landing */

:root {
  --bg: #0a0b20;
  --bg-elevated: rgba(18, 20, 48, 0.72);
  --text: #f2f1f8;
  --text-muted: #a8a4c4;
  --lavender: #c6bfee;
  --magenta: #a25b97;
  --purple: #8961aa;
  --border: rgba(198, 191, 238, 0.14);
  --radius: 16px;
  --radius-sm: 10px;
  --max: 1080px;
  --font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--lavender);
  text-decoration: none;
  transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
  color: #ddd8f7;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--lavender);
  outline-offset: 3px;
}

.container {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

.section {
  padding: 4.5rem 0;
  position: relative;
  z-index: 1;
}

.section-intro {
  max-width: 36rem;
  margin-bottom: 2.25rem;
}

.section-intro h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

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

/* Background atmosphere */
.bg-blobs {
  position: fixed;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}

.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.45;
  will-change: transform;
}

.blob-a {
  width: min(55vw, 480px);
  height: min(55vw, 480px);
  top: -8%;
  right: -8%;
  background: radial-gradient(circle, rgba(162, 91, 151, 0.55), transparent 70%);
  animation: drift-a 22s ease-in-out infinite alternate;
}

.blob-b {
  width: min(50vw, 420px);
  height: min(50vw, 420px);
  top: 38%;
  left: -12%;
  background: radial-gradient(circle, rgba(137, 97, 170, 0.5), transparent 70%);
  animation: drift-b 26s ease-in-out infinite alternate;
}

.blob-c {
  width: min(40vw, 360px);
  height: min(40vw, 360px);
  bottom: 5%;
  right: 10%;
  background: radial-gradient(circle, rgba(198, 191, 238, 0.28), transparent 70%);
  animation: drift-c 20s ease-in-out infinite alternate;
}

@keyframes drift-a {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(-4%, 6%) scale(1.08); }
}

@keyframes drift-b {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(6%, -5%) scale(1.06); }
}

@keyframes drift-c {
  from { transform: translate(0, 0); }
  to { transform: translate(-5%, -4%); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .blob { animation: none; }
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(10, 11, 32, 0.72);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
}

.brand:hover {
  color: var(--text);
  opacity: 0.9;
}

.brand-name {
  font-weight: 650;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-link {
  color: var(--lavender);
  font-size: 0.875rem;
  font-weight: 600;
}

.header-link:hover {
  color: #ddd8f7;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--magenta), var(--purple));
  color: #fff;
  font-size: 0.875rem;
  font-weight: 600;
}

.header-cta:hover {
  color: #fff;
  opacity: 0.92;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1.4rem;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--magenta), var(--purple));
  color: #fff;
  box-shadow: 0 10px 28px rgba(162, 91, 151, 0.35);
}

.btn-primary:hover {
  color: #fff;
  opacity: 0.95;
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--lavender);
  border: 1px solid rgba(198, 191, 238, 0.35);
}

.btn-secondary:hover {
  color: #fff;
  border-color: var(--lavender);
  background: rgba(198, 191, 238, 0.08);
}

.btn-block {
  width: 100%;
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.btn:disabled {
  opacity: 0.65;
  cursor: wait;
  transform: none;
}

/* Hero */
.hero {
  padding-top: 4.5rem;
  padding-bottom: 5rem;
}

.hero-inner {
  max-width: 42rem;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--lavender);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.hero h1 {
  margin: 0 0 1.1rem;
  font-size: clamp(2rem, 5.5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.12;
  color: var(--text);
}

.hero-sub {
  margin: 0 0 1.75rem;
  max-width: 36rem;
  color: var(--text-muted);
  font-size: clamp(1.05rem, 2.2vw, 1.2rem);
  line-height: 1.55;
}

/* Problem cards */
.card-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 768px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.35rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.card h3 {
  margin: 0 0 0.65rem;
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.015em;
  color: var(--lavender);
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* How it works */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
}

.step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  backdrop-filter: blur(10px);
}

.step-num {
  flex-shrink: 0;
  width: 2.1rem;
  height: 2.1rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--magenta), var(--purple));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 700;
}

.step h3 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.4;
  color: var(--text);
}

.step p {
  margin: 0.4rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Who it's for */
.audience-list {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.audience-list li {
  padding: 0.65rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(198, 191, 238, 0.06);
  color: var(--lavender);
  font-size: 0.95rem;
  font-weight: 500;
}

.audience-line {
  margin: 0;
  max-width: 34rem;
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Early access form */
.early-access {
  padding-bottom: 5.5rem;
}

.form-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: 1.75rem 1.35rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  max-width: 40rem;
  margin-inline: auto;
}

@media (min-width: 640px) {
  .form-panel {
    padding: 2.25rem;
  }
}

.form-copy h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.form-copy p {
  margin: 0 0 1.75rem;
  color: var(--text-muted);
}

.waitlist-form {
  display: grid;
  gap: 1rem;
}

.field-row {
  display: grid;
  gap: 1rem;
}

@media (min-width: 640px) {
  .field-row {
    grid-template-columns: 1fr 1fr;
  }
}

.field {
  display: grid;
  gap: 0.4rem;
}

.field label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--lavender);
}

.optional {
  color: var(--text-muted);
  font-weight: 400;
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(10, 11, 32, 0.65);
  color: var(--text);
  font: inherit;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.field input::placeholder,
.field textarea::placeholder {
  color: rgba(168, 164, 196, 0.7);
}

.field input:hover,
.field textarea:hover {
  border-color: rgba(198, 191, 238, 0.28);
}

.field input:focus,
.field textarea:focus {
  border-color: var(--purple);
  background: rgba(10, 11, 32, 0.85);
}

.field textarea {
  resize: vertical;
  min-height: 6rem;
}

.form-error {
  margin: 0;
  color: #f0a0b8;
  font-size: 0.9rem;
}

.form-error[hidden],
.thank-you[hidden],
.waitlist-form[hidden],
.try-form[hidden],
.form-copy[hidden] {
  display: none !important;
}

.thank-you {
  padding: 1.5rem 0 0.5rem;
  text-align: center;
}

.thank-you-msg {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--lavender);
  letter-spacing: -0.015em;
}

.thank-you-sub {
  margin: 1rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* Try Now experiment */
.try-page .try-section {
  padding-top: 3rem;
  padding-bottom: 4.5rem;
}

.try-panel {
  max-width: 42rem;
}

.try-headline {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.try-form {
  display: grid;
  gap: 1rem;
}

.field-hint {
  margin: -0.15rem 0 0.15rem;
  color: var(--text-muted);
  font-size: 0.8rem;
}

.field-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--lavender);
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.file-picker {
  position: relative;
}

.file-pick-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px dashed rgba(198, 191, 238, 0.4);
  background: rgba(10, 11, 32, 0.65);
  color: var(--lavender);
  font: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}

.file-pick-btn:hover {
  border-color: var(--lavender);
  background: rgba(198, 191, 238, 0.08);
  color: #fff;
}

.field input[type="file"] {
  padding: 0.65rem 0.75rem;
  cursor: pointer;
  color: var(--text-muted);
}

.file-list {
  list-style: none;
  margin: 0.35rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
}

.file-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: rgba(10, 11, 32, 0.45);
  font-size: 0.85rem;
}

.file-list-meta {
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-remove {
  flex-shrink: 0;
  border: 0;
  background: transparent;
  color: var(--lavender);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.file-remove:hover {
  color: #fff;
}

/* Footer */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 2rem 0 2.5rem;
}

.footer-inner {
  display: grid;
  gap: 0.75rem;
}

.footer-tagline,
.footer-contact {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-contact a {
  font-weight: 500;
}

@media (min-width: 768px) {
  .hero {
    padding-top: 6rem;
    padding-bottom: 6.5rem;
  }

  .section {
    padding: 5.5rem 0;
  }
}