/* ============================================================
   Mode.Inc — Email signature generator
   Dark institutional canvas per the Mode.Inc design system:
   black #000000 · white text · #00FF9D mint accent.
   ============================================================ */

@font-face {
  font-family: 'Manrope';
  src: url('fonts/Manrope-VariableFont_wght.ttf') format('truetype-variations');
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'JetBrains Mono';
  src: url('fonts/JetBrainsMono-VariableFont_wght.ttf') format('truetype-variations');
  font-weight: 100 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --mode-ink: #000000;
  --mode-green: #00FF9D;
  --mode-paper-warm: #FAFAF7;
  --mode-signal-red: #FF3B47;
  --font-body: 'Manrope', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --ease-mode: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur-fast: 140ms;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--mode-ink);
  color: #FFFFFF;
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: var(--mode-green); }
a:hover { text-decoration: underline; text-underline-offset: 4px; }

:where(a, button, input):focus-visible {
  outline: 2px solid var(--mode-green);
  outline-offset: 2px;
  border-radius: 2px;
}

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ─────────────────────────────────────────────── */

.page-header {
  padding: clamp(28px, 5vw, 56px) clamp(20px, 4vw, 48px) 0;
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
}

.page-header h1 {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}

.page-header p {
  font-size: 17px;
  line-height: 1.5;
  color: #B9BDC4;
  max-width: 56ch;
  margin: 0;
}

/* ── Layout ─────────────────────────────────────────────── */

.layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(420px, 100%), 1fr));
  gap: clamp(24px, 3vw, 48px);
  padding: clamp(28px, 4vw, 44px) clamp(20px, 4vw, 48px) 64px;
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  align-items: start;
}

/* ── Form card ──────────────────────────────────────────── */

.form-card {
  background: #0A0A0A;
  border: 1px solid #232323;
  border-radius: 16px;
  padding: clamp(20px, 3vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: opacity var(--dur-fast);
}

.field label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #8A8F98;
}

.field input {
  width: 100%;
  background: #000000;
  border: 1px solid #2E2E2E;
  border-radius: 8px;
  padding: 11px 12px;
  color: #FFFFFF;
  font-family: var(--font-body);
  font-size: 15px;
  outline: none;
  transition: border-color var(--dur-fast);
}

.field input::placeholder { color: #565B64; }
.field input:focus { border-color: var(--mode-green); }

.field-error {
  font-size: 12px;
  color: var(--mode-signal-red);
}

/* ── Copy actions ───────────────────────────────────────── */

.copy-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid #232323;
  padding-top: 20px;
}

.copy-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  transition: opacity var(--dur-fast);
}

.copy-row.invalid { opacity: 0.55; }

/* Design-system Button: pill, mandatory trailing arrow */
.btn {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: 999px;
  height: 44px;
  padding: 0 26px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  text-decoration: none;
  transition: transform var(--dur-fast) var(--ease-mode),
              background-color var(--dur-fast) var(--ease-mode),
              border-color var(--dur-fast),
              color var(--dur-fast);
}

.btn-arrow {
  font-family: var(--font-mono);
  font-size: 14px;
}

.btn-primary-dark {
  background: #FFFFFF;
  color: #000000;
}
.btn-primary-dark:hover {
  background: var(--mode-paper-warm);
  transform: scale(1.02);
}
.btn-primary-dark:active {
  transform: scale(0.985);
}

.btn-secondary {
  background: transparent;
  color: #FFFFFF;
  border-color: #3A3A42;
}
.btn-secondary:hover { border-color: #FFFFFF; }

.install-jump {
  border-top: 1px solid #232323;
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mode-green);
  text-decoration: none;
}

/* ── Install guide ──────────────────────────────────────── */

.install {
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  padding: 8px clamp(20px, 4vw, 48px) 96px;
  display: flex;
  flex-direction: column;
  gap: 40px;
  scroll-margin-top: 24px;
}

.install-head {
  border-top: 1px solid #232323;
  padding-top: clamp(40px, 6vw, 64px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--mode-green);
}

.install-head h2 {
  font-weight: 500;
  font-size: clamp(26px, 3.2vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

.install-head p {
  font-size: 16px;
  line-height: 1.55;
  color: #B9BDC4;
  max-width: 60ch;
  margin: 0;
}

.install-head p strong { color: #FFFFFF; font-weight: 600; }

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.step {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(20px, 3vw, 48px);
  align-items: start;
  padding: 32px 0;
  border-top: 1px solid #1A1A1F;
}

.step:first-child { border-top: none; padding-top: 0; }

.step-text {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mode-green);
}

.step h3 {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0;
}

.step p {
  font-size: 15px;
  line-height: 1.6;
  color: #C7CAD1;
  max-width: 52ch;
  margin: 0;
}

.step p strong { color: #FFFFFF; font-weight: 600; }

.step .step-note {
  font-size: 13px;
  color: #8A8F98;
  border-left: 2px solid var(--mode-green);
  padding-left: 12px;
}

.step .step-note strong { color: #C7CAD1; }

.step-shot {
  margin: 0;
  background: #FFFFFF;
  border: 1px solid #2A2A2A;
  border-radius: 16px;
  overflow: hidden;
}

.step-shot img {
  display: block;
  width: 100%;
  height: auto;
}

@media (max-width: 760px) {
  .step { grid-template-columns: 1fr; }
}

.install-rules {
  background: #0A0A0A;
  border: 1px solid #232323;
  border-radius: 16px;
  padding: clamp(20px, 3vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.install-rules h3 {
  font-size: 17px;
  font-weight: 600;
  margin: 0;
}

.install-rules p {
  font-size: 15px;
  line-height: 1.6;
  color: #C7CAD1;
  max-width: 72ch;
  margin: 0;
}

.install-footnote {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  line-height: 1.6;
  color: #565B64;
  margin: -16px 0 0;
}

/* ── Preview panel ──────────────────────────────────────── */

.preview-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
  position: sticky;
  top: 24px;
}

.preview-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mode-green);
}

.gmail-mock {
  background: #FAFAF7;
  border: 1px solid #2A2A2A;
  border-radius: 16px;
  overflow: hidden;
}

.gmail-bar {
  background: #F2F2EC;
  border-bottom: 1px solid #E4E4DD;
  padding: 12px 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #6B7280;
}

.gmail-meta {
  border-bottom: 1px solid #ECECE5;
  padding: 12px 20px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  color: #9AA0A6;
}

.gmail-meta span { color: #333333; }

.gmail-body { padding: 22px 20px 30px; }

.gmail-signoff {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  color: #333333;
  margin: 0 0 16px;
}