/* ============================================================
   iSignature — pre-launch landing page
   Ink (dark) bands bookend the page; Paper (light) bands carry
   the explanatory content. Ballpoint blue is the "pen" accent.
   ============================================================ */

:root {
  --ink: #14213d;
  --ink-deep: #0d1728;
  --paper: #ede9e1;
  --paper-bright: #f8f6f1;
  --ballpoint: #3350ff;
  --ballpoint-glow: #8fa2ff;
  --verified: #1fa971;
  --danger: #e5484d;
  --graphite: #5b6472;

  --on-navy-70: rgba(248, 246, 241, 0.72);
  --on-navy-45: rgba(248, 246, 241, 0.45);
  --hairline-navy: rgba(248, 246, 241, 0.14);
  --hairline-paper: rgba(20, 33, 61, 0.12);

  --font-display: "Libre Caslon Display", "Iowan Old Style", serif;
  --font-serif: "Libre Caslon Text", "Iowan Old Style", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace;

  --max-w: 1160px;
  --pad: clamp(24px, 5vw, 64px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

a {
  color: inherit;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
}

.band-navy .eyebrow,
.nav .eyebrow {
  color: var(--ballpoint-glow);
}

.band-paper .eyebrow {
  color: var(--ballpoint);
}

/* ---------------- Nav ---------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--ink);
  border-bottom: 1px solid var(--hairline-navy);
}

.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--paper-bright);
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand svg {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  color: var(--on-navy-70);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--paper-bright);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--ballpoint);
  color: var(--paper-bright) !important;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease;
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background: #4a63ff;
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  color: var(--paper-bright);
  cursor: pointer;
  padding: 8px;
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

/* ---------------- Bands ---------------- */

.band-navy {
  background: var(--ink);
  color: var(--on-navy-70);
}

.band-navy.deep {
  background: var(--ink-deep);
}

.band-paper {
  background: var(--paper);
}

.band-paper.bright {
  background: var(--paper-bright);
}

section {
  padding: clamp(64px, 10vw, 120px) 0;
}

.hairline-top {
  border-top: 1px solid var(--hairline-paper);
}

h1,
h2,
h3 {
  font-family: var(--font-serif);
  font-weight: 400;
  margin: 0;
  letter-spacing: -0.01em;
}

h1 em,
h2 em {
  font-style: italic;
  color: var(--ballpoint-glow);
}

.band-paper h2 em,
.band-paper h1 em {
  color: var(--ballpoint);
}

/* ---------------- Hero ---------------- */

.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(32px, 6vw, 80px);
  align-items: center;
  padding-top: clamp(56px, 9vw, 96px);
  padding-bottom: clamp(56px, 9vw, 96px);
}

.hero-copy .eyebrow {
  margin-bottom: 22px;
  display: block;
}

.hero-copy h1 {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.08;
  color: var(--paper-bright);
}

.hero-copy p.lede {
  margin: 24px 0 0;
  max-width: 46ch;
  font-size: 1.08rem;
  color: var(--on-navy-70);
}

.waitlist-form {
  display: flex;
  gap: 10px;
  margin-top: 32px;
  max-width: 460px;
}

.cta-btn {
  margin-top: 32px;
}

.waitlist-form input[type="email"],
.waitlist-form input[type="text"] {
  flex: 1;
  min-width: 0;
  width: 100%;
  box-sizing: border-box;
  background: var(--ink-deep);
  border: 1px solid var(--hairline-navy);
  color: var(--paper-bright);
  padding: 13px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: var(--font-body);
}

.waitlist-form input[type="email"]::placeholder,
.waitlist-form input[type="text"]::placeholder {
  color: var(--on-navy-45);
}

.waitlist-form input[type="email"]:focus-visible,
.waitlist-form input[type="text"]:focus-visible {
  outline: 2px solid var(--ballpoint-glow);
  outline-offset: 1px;
}

.waitlist-form input.invalid {
  border-color: var(--danger);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
}

.field-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--on-navy-45);
}

.field-error {
  font-size: 0.78rem;
  color: var(--danger);
  display: none;
}

.field-error.visible {
  display: block;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  white-space: nowrap;
  background: var(--ballpoint);
  color: var(--paper-bright);
  border: 0;
  padding: 13px 20px;
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn:hover,
.btn:focus-visible {
  background: #4a63ff;
  transform: translateY(-1px);
}

.btn:focus-visible {
  outline: 2px solid var(--paper-bright);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.form-micro {
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--on-navy-45);
}

.form-success {
  margin-top: 14px;
  font-size: 0.88rem;
  display: none;
}

.modal .form-success {
  color: var(--verified);
}

.form-success.visible {
  display: block;
}

.modal.submitted .waitlist-form,
.modal.submitted .form-micro {
  display: none;
}

.modal.submitted .form-success {
  margin-top: 24px;
  padding: 40px 0;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 700;
  text-align: center;
}

.form-error {
  margin-top: 14px;
  font-size: 0.88rem;
  display: none;
}

.modal .form-error {
  color: var(--danger);
}

.form-error.visible {
  display: block;
}

/* ---------------- Signature pad ---------------- */

.pad {
  background: var(--paper-bright);
  border-radius: 18px;
  padding: clamp(24px, 4vw, 40px);
  box-shadow: 0 30px 70px -20px rgba(0, 0, 0, 0.55);
  position: relative;
}

.pad-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--graphite);
  display: flex;
  justify-content: space-between;
}

.pad-canvas {
  margin: 18px 0 6px;
  width: 100%;
  height: auto;
  display: block;
}

.pad-canvas path {
  fill: none;
  stroke: var(--ballpoint);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.pad-canvas .flourish {
  stroke-width: 4;
}

.pad-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px dashed var(--hairline-paper);
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.pad-status .verified-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--verified);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.pad-status .verified-tag.show {
  opacity: 1;
  transform: translateY(0);
}

.pad-status .verified-tag svg {
  width: 13px;
  height: 13px;
}

/* ---------------- Section headers ---------------- */

.section-head {
  max-width: 640px;
  margin-bottom: clamp(40px, 6vw, 64px);
}

.section-head .eyebrow {
  display: block;
  margin-bottom: 14px;
}

.section-head h2 {
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
  line-height: 1.15;
}

.band-navy .section-head h2 {
  color: var(--paper-bright);
}

.section-head p {
  margin: 18px 0 0;
  color: var(--graphite);
  font-size: 1.02rem;
}

.band-navy .section-head p {
  color: var(--on-navy-70);
}

/* ---------------- How it works ---------------- */

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

.step-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ballpoint);
  letter-spacing: 0.08em;
}

.step h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.15rem;
  margin: 12px 0 8px;
}

.step p {
  margin: 0;
  color: var(--graphite);
  font-size: 0.96rem;
}

/* ---------------- Platforms ---------------- */

.platforms {
  margin-top: clamp(56px, 8vw, 88px);
  padding-top: clamp(56px, 8vw, 88px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.platform-card {
  background: var(--paper-bright);
  border: 1px solid var(--hairline-paper);
  border-radius: 14px;
  padding: 26px;
}

.platform-card .plat-name {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 1.02rem;
  margin-bottom: 14px;
}

.plat-tag {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--graphite);
  border: 1px solid var(--hairline-paper);
  padding: 3px 8px;
  border-radius: 999px;
}

.code-chip {
  background: var(--ink);
  color: var(--paper-bright);
  border-radius: 8px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  overflow-x: auto;
  white-space: pre;
  margin: 0 0 14px;
}

.code-chip .tok {
  color: var(--ballpoint-glow);
}

.platform-card p {
  margin: 0;
  color: var(--graphite);
  font-size: 0.92rem;
}

/* ---------------- Security ---------------- */

.security-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 72px);
  align-items: start;
}

.check-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.check-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.check-list svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--verified);
}

.check-list strong {
  color: var(--paper-bright);
  font-weight: 600;
  display: block;
  margin-bottom: 2px;
  font-size: 0.98rem;
}

.check-list span {
  color: var(--on-navy-70);
  font-size: 0.92rem;
}

.record-card {
  background: var(--ink-deep);
  border: 1px solid var(--hairline-navy);
  border-radius: 14px;
  padding: 24px 26px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.record-card .record-title {
  color: var(--on-navy-45);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.record-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px dashed var(--hairline-navy);
  color: var(--on-navy-70);
}

.record-row:last-child {
  border-bottom: 0;
}

.record-row span:first-child {
  color: var(--on-navy-45);
}

.record-row.status span:last-child {
  color: var(--verified);
}

/* ---------------- Pricing ---------------- */

.tier-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}

.tier-chip {
  border: 1px solid var(--hairline-paper);
  border-radius: 12px;
  padding: 22px;
  background: var(--paper-bright);
}

.tier-chip .tier-name {
  font-weight: 600;
  font-size: 1.02rem;
}

.tier-chip .tier-note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-top: 8px;
  display: block;
}

/* ---------------- Final CTA ---------------- */

.final-cta {
  text-align: center;
}

.final-cta .wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.final-cta h2 {
  color: var(--paper-bright);
  font-size: clamp(2.1rem, 4.5vw, 3rem);
  max-width: 14ch;
}

.final-cta p {
  margin: 20px 0 0;
  color: var(--on-navy-70);
  max-width: 46ch;
}

.final-cta .cta-btn {
  margin-top: 34px;
}

/* ---------------- Footer ---------------- */

footer.band-navy {
  padding: 40px 0;
}

.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--paper-bright);
  font-weight: 600;
}

.footer-brand svg {
  width: 20px;
  height: 20px;
}

.footer-tagline {
  color: var(--on-navy-45);
  font-size: 0.85rem;
  margin-left: 12px;
  font-style: italic;
  font-family: var(--font-serif);
}

.footer-meta {
  color: var(--on-navy-45);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

/* ---------------- Reveal on scroll ---------------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------------- Responsive ---------------- */

@media (max-width: 880px) {
  .nav-links {
    position: fixed;
    inset: 72px 0 auto 0;
    background: var(--ink);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px var(--pad) 20px;
    border-bottom: 1px solid var(--hairline-navy);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease;
  }

  .nav-links.open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links a,
  .nav-links .nav-cta {
    width: 100%;
    padding: 14px 0;
  }

  .nav-links .nav-cta {
    justify-content: center;
    margin-top: 8px;
    padding: 13px 18px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .hero .wrap {
    grid-template-columns: 1fr;
  }

  .steps,
  .platforms,
  .security-grid,
  .tier-row {
    grid-template-columns: 1fr;
  }

  .platforms {
    border-top: 1px solid var(--hairline-paper);
  }

  .modal .waitlist-form {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .waitlist-form {
    flex-direction: column;
  }

  .footer-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------------- Modal ---------------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--pad);
  background: rgba(13, 23, 40, 0.6);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
  .modal-overlay {
    transition: none;
  }
}

body.modal-open {
  overflow: hidden;
}

.modal {
  position: relative;
  width: 100%;
  max-width: 620px;
  background: var(--ink);
  color: var(--on-navy-70);
  border-radius: 14px;
  padding: 40px;
  box-shadow: 0 24px 64px rgba(13, 23, 40, 0.45);
}

.modal h2 {
  color: var(--paper-bright);
  font-size: clamp(1.6rem, 3.5vw, 2rem);
  margin: 0 0 12px;
}

.modal p {
  margin: 0;
  color: var(--on-navy-70);
}

.modal .waitlist-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 20px;
  margin-top: 24px;
  max-width: none;
}

.modal .waitlist-form .btn {
  grid-column: 1 / -1;
}

.modal .form-micro {
  margin-top: 18px;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: 0;
  color: var(--on-navy-70);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 8px;
}

.modal-close:hover,
.modal-close:focus-visible {
  color: var(--paper-bright);
}

.modal-close:focus-visible {
  outline: 2px solid var(--ballpoint-glow);
  outline-offset: 2px;
  border-radius: 6px;
}