/* TipidGas landing — paired with index.html. Two-column hero at >=900px, stacks
   on mobile. Palette mirrors the Flutter app (green #16A34A, forest #14321F,
   cream #F0FDF4) so the transition to /app/ feels seamless. */

* { box-sizing: border-box; }

:root {
  --green: #16A34A;
  --green-dark: #15803D;
  --green-deep: #14532D;
  --forest: #14321F;
  --forest-2: #0F2A1C;
  --cream: #F0FDF4;
  --mint: #DCFCE7;
  --ink: #0B1F14;
  --muted: #4B5F54;
  --line: #D8EDE1;
  --white: #FFFFFF;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(15, 42, 28, 0.06);
  --shadow-md: 0 10px 30px -12px rgba(15, 42, 28, 0.25);
  --shadow-lg: 0 30px 80px -20px rgba(15, 42, 28, 0.35);
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* ───────────────────────── Nav ───────────────────────── */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px clamp(20px, 5vw, 48px);
  max-width: 1280px;
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 20px;
  letter-spacing: -0.4px;
  color: var(--forest);
}
.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  display: block;
  box-shadow: var(--shadow-sm);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}
.nav-links a:hover { color: var(--forest); }
.nav-cta {
  background: var(--forest);
  color: var(--cream) !important;
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
}
.nav-cta:hover { background: var(--green-deep); }
@media (max-width: 620px) {
  .nav-links a:not(.nav-cta) { display: none; }
}

/* ───────────────────────── Hero ───────────────────────── */
.hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: 24px clamp(20px, 5vw, 48px) 64px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
  }
}
@media (min-width: 1100px) {
  .hero-grid { gap: 88px; }
}

/* ─────────────── LEFT: live app preview (iframe) ─────────────── */
.preview {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  order: 2;
}
@media (min-width: 900px) {
  .preview { order: 1; }
}

.phone {
  width: min(340px, 100%);
  background: var(--forest);
  border-radius: 44px;
  padding: 14px;
  box-shadow: var(--shadow-lg);
  position: relative;
  aspect-ratio: 9 / 18;
}
.phone-notch {
  position: absolute;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  width: 96px;
  height: 22px;
  background: var(--forest-2);
  border-radius: 999px;
  z-index: 3;
}
.phone-screen {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 32px;
  overflow: hidden;
  background: var(--cream);
}

/* Loading placeholder shown until the iframe's `load` event fires. Once the
   iframe finishes its first round trip we add .ready which fades out the
   loader — Flutter's own splash keeps running inside. */
.phone-loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--cream);
  color: var(--forest);
  z-index: 2;
  transition: opacity 0.5s ease;
}
.phone-iframe.ready + .phone-loading,
.phone-iframe.ready ~ .phone-loading {
  opacity: 0;
  pointer-events: none;
}
/* Load order in HTML puts iframe after loader — adjacent sibling selector
   above won't hit. Handle with :has() on modern browsers, else JS toggles. */
.phone-screen:has(.phone-iframe.ready) .phone-loading {
  opacity: 0;
  pointer-events: none;
}
.phone-spinner {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 3px solid var(--mint);
  border-top-color: var(--green);
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.phone-loading-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.2px;
}

/* Push Flutter's viewport below the notch area (~38px) and render it at a
   larger virtual width so the app lays out with more breathing room, then
   scale down via CSS to fit — net effect: content appears zoomed out and
   the notch sits in empty space above. */
.phone-iframe {
  position: absolute;
  left: 0;
  top: 38px;
  width: 125%;
  height: calc((100% - 38px) * 1.25);
  border: 0;
  background: transparent;
  opacity: 0;
  transition: opacity 0.6s ease;
  transform: scale(0.8);
  transform-origin: top left;
}
.phone-iframe.ready { opacity: 1; }

/* ─────────────── Store badges (coming-soon) ─────────────── */
.store-row {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.store-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--muted);
  position: relative;
  padding: 0 22px;
}
.store-label::before,
.store-label::after {
  content: '';
  position: absolute;
  top: 50%;
  width: 16px;
  height: 1.5px;
  background: var(--line);
}
.store-label::before { right: 100%; }
.store-label::after { left: 100%; }

.store-badges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}
.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: 12px;
  background: var(--forest);
  color: var(--cream);
  border: none;
  font: inherit;
  cursor: not-allowed;
  opacity: 0.92;
  transition: opacity 0.15s, transform 0.1s;
  min-width: 170px;
}
.store-badge:hover { opacity: 1; }
.store-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}
.store-txt {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.15;
  text-align: left;
}
.store-hint {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  opacity: 0.85;
}
.store-name {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.2px;
}

/* ─────────────── RIGHT: signup ─────────────── */
.signup { order: 1; }
@media (min-width: 900px) { .signup { order: 2; } }

.eyebrow {
  display: inline-block;
  background: var(--mint);
  color: var(--green-deep);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 18px;
}
.headline {
  font-size: clamp(32px, 5vw, 52px);
  line-height: 1.05;
  font-weight: 900;
  letter-spacing: -1.2px;
  color: var(--forest);
  margin: 0 0 16px;
}
.headline-hi {
  background: linear-gradient(90deg, var(--green) 0%, var(--green-dark) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.sub {
  font-size: 17px;
  color: var(--muted);
  margin: 0 0 28px;
  max-width: 520px;
}

.form {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.ref-banner {
  background: var(--mint);
  color: var(--green-deep);
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
}
.ref-banner b { font-weight: 700; letter-spacing: 0.5px; }

.field { display: flex; flex-direction: column; }
.field-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--forest);
  margin-bottom: 6px;
}
.required { color: #DC2626; }
.optional { color: var(--muted); font-weight: 500; }
.field input {
  font: inherit;
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: var(--white);
  color: var(--ink);
  transition: border-color 0.15s, box-shadow 0.15s;
  -webkit-appearance: none;
}
.field input:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.15);
}
.field input::placeholder { color: #9CAEA3; }

.cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: var(--green);
  color: var(--white);
  border: none;
  border-radius: 12px;
  padding: 16px 24px;
  font: inherit;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  box-shadow: 0 10px 24px -8px rgba(22, 163, 74, 0.55);
  transition: background 0.15s, transform 0.1s;
}
.cta:hover { background: var(--green-dark); }
.cta:active { transform: translateY(1px); }
.cta[disabled] { opacity: 0.6; cursor: wait; }
.cta-arrow { transition: transform 0.15s; }
.cta:hover .cta-arrow { transform: translateX(3px); }

.fine {
  font-size: 12px;
  color: var(--muted);
  margin: 0;
  text-align: center;
}
.error {
  color: #DC2626;
  font-size: 13px;
  font-weight: 500;
  background: #FEF2F2;
  padding: 10px 12px;
  border-radius: 10px;
  margin: 0;
}

/* ─────────────── Success modal ─────────────── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal[hidden] { display: none; }
.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 42, 28, 0.55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  animation: modal-fade 0.18s ease-out;
}
.modal-card {
  position: relative;
  z-index: 1;
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 40px 28px 28px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
  text-align: center;
  width: 100%;
  max-width: 480px;
  max-height: 92vh;
  overflow-y: auto;
  animation: modal-rise 0.24s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.modal-close {
  position: absolute;
  top: 10px;
  right: 12px;
  width: 32px;
  height: 32px;
  border: none;
  background: var(--cream);
  color: var(--forest);
  border-radius: 50%;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s;
}
.modal-close:hover { background: var(--mint); }
@keyframes modal-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes modal-rise {
  from { opacity: 0; transform: translateY(12px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.success-icon { font-size: 48px; margin-bottom: 8px; }
.success-title {
  font-size: 28px;
  font-weight: 800;
  color: var(--forest);
  margin: 0 0 8px;
  letter-spacing: -0.5px;
}
.success-sub {
  color: var(--muted);
  margin: 0 0 24px;
  font-size: 15px;
}
.success-sub b { color: var(--green-deep); font-weight: 700; }

.share-box {
  background: var(--cream);
  border-radius: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  text-align: left;
}
.share-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 8px;
}
.share-input-row {
  display: flex;
  gap: 8px;
}
.share-input-row input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 13px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  color: var(--forest);
}
.copy-btn {
  font: inherit;
  font-weight: 700;
  font-size: 13px;
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  background: var(--forest);
  color: var(--cream);
  cursor: pointer;
  transition: background 0.15s;
}
.copy-btn:hover { background: var(--green-deep); }
.copy-btn.copied { background: var(--green); }

.share-stats {
  display: flex;
  gap: 8px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}
.share-stats b { color: var(--forest); font-weight: 700; }

.share-actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  flex-wrap: wrap;
}
.share-pill {
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--white);
  border: 1px solid var(--line);
  color: var(--forest);
  cursor: pointer;
}
.share-pill:hover {
  background: var(--mint);
  border-color: var(--green);
}

body.modal-open { overflow: hidden; }

/* ─────────────── How it works ─────────────── */
.how, .faq, .rewards, .invite {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px clamp(20px, 5vw, 48px);
}
.section-title {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 800;
  color: var(--forest);
  letter-spacing: -0.5px;
  margin: 0 0 28px;
  text-align: center;
}
.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 720px) {
  .steps { grid-template-columns: repeat(3, 1fr); gap: 20px; }
}
.step {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--mint);
  color: var(--green-deep);
  font-weight: 800;
  font-size: 16px;
  margin-bottom: 12px;
}
.step-title {
  font-weight: 800;
  font-size: 17px;
  color: var(--forest);
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}
.step-body {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.5;
}

/* ─────────────── Rewards section ─────────────── */
.rewards-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 32px;
}
.rewards-head .eyebrow { margin-bottom: 12px; }
.section-sub {
  font-size: 15px;
  color: var(--muted);
  margin: 12px 0 0;
  line-height: 1.6;
}

.reward-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
@media (min-width: 560px) {
  .reward-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .reward-grid { grid-template-columns: repeat(4, 1fr); gap: 18px; }
}
.reward-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 22px 20px 18px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s, box-shadow 0.2s;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.reward-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.reward-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 4px;
}
.icon-load { background: #DBEAFE; }
.icon-shop { background: #FFE4E4; }
.icon-food { background: #FEF3C7; }
.icon-gas  { background: var(--mint); }
.reward-title {
  font-weight: 800;
  font-size: 16px;
  color: var(--forest);
  letter-spacing: -0.3px;
}
.reward-body {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}
.reward-tag {
  display: inline-block;
  margin-top: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--cream);
  color: var(--green-deep);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  align-self: flex-start;
  border: 1px solid var(--line);
}

/* ─────────────── Invite / Referral section ─────────────── */
.invite { background: linear-gradient(180deg, transparent 0%, var(--mint) 100%); }
.invite-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}
@media (min-width: 900px) {
  .invite-grid { grid-template-columns: 1.3fr 1fr; gap: 56px; }
}
.section-title-left {
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 800;
  color: var(--forest);
  letter-spacing: -0.8px;
  margin: 0 0 10px;
  line-height: 1.1;
}
.invite-steps {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.invite-steps li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
}
.invite-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--green);
  color: var(--white);
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}
.invite-steps li > div > b {
  font-weight: 800;
  color: var(--forest);
  font-size: 15px;
  letter-spacing: -0.2px;
}
.invite-sub {
  font-size: 13px;
  color: var(--muted);
  margin-top: 3px;
  line-height: 1.5;
}
.invite-sub b { color: var(--forest); font-weight: 700; }
.inline-tag {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--mint);
  color: var(--green-deep) !important;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1px;
}

/* Highlight step — emphasizes the points-for-active-referrals payoff. */
.invite-step-highlight {
  background: linear-gradient(135deg, var(--forest) 0%, var(--forest-2) 100%) !important;
  border-color: var(--forest) !important;
  color: var(--cream);
}
.invite-step-highlight > div > b { color: var(--white) !important; }
.invite-step-highlight .invite-sub { color: rgba(240, 253, 244, 0.82); }
.invite-step-highlight .invite-sub b { color: var(--white); }
.invite-step-highlight .inline-tag {
  background: rgba(240, 253, 244, 0.18);
  color: var(--white) !important;
}
.invite-num.gold {
  background: #FBBF24;
  color: #78350F;
  font-size: 16px;
}

.invite-math {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 20px;
}
.math-head {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.math-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 10px 0;
  font-size: 15px;
  color: var(--forest);
}
.math-row.total { font-weight: 800; font-size: 17px; }
.math-val { font-weight: 700; font-variant-numeric: tabular-nums; }
.math-val.green { color: var(--green-dark); font-size: 22px; }
.math-val.green.small { font-size: 14px; letter-spacing: -0.2px; }
.math-section-label {
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--green-dark);
  margin: 4px 0 4px;
}
.math-section-label.with-top {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.math-divider {
  height: 1px;
  background: var(--line);
  margin: 6px 0;
}
.math-note {
  font-size: 12px;
  color: var(--muted);
  margin-top: 14px;
  line-height: 1.5;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

/* ─────────────── FAQ ─────────────── */
.faq details {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0;
  margin-bottom: 10px;
  overflow: hidden;
}
.faq summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 700;
  color: var(--forest);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  font-weight: 400;
  font-size: 20px;
  color: var(--green);
  transition: transform 0.2s;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

/* ─────────────── Footer ─────────────── */
.foot {
  border-top: 1px solid var(--line);
  padding: 24px clamp(20px, 5vw, 48px);
  color: var(--muted);
  font-size: 13px;
}
.foot-row {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}
.foot-row a:hover { color: var(--forest); }