/* =============================================================================
   Custom Properties
   ============================================================================= */

:root {
  --color-dark:    #1E2C34;
  --color-light:   #FAFBFC;
  --color-main:    #62B5E5;
  --color-paper:   #F2EEE7;
  --color-rule:    rgba(30, 44, 52, 0.12);
  --color-mute:    rgba(30, 44, 52, 0.55);
  --color-faint:   rgba(30, 44, 52, 0.35);

  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans:  'Instrument Sans', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', ui-monospace, monospace;

  --max:        1280px;
  --col:        680px;

  --ease:       cubic-bezier(.2,.7,.2,1);
}


/* =============================================================================
   Reset
   ============================================================================= */

* { box-sizing: border-box; }

html, body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, figcaption, blockquote, fieldset, legend {
  margin: 0; padding: 0;
}

ul, ol { list-style: none; }
fieldset { border: none; }
img, picture, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; }
[hidden] { display: none !important; }


/* =============================================================================
   Base
   ============================================================================= */

html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-dark);
  background: var(--color-light);
  overflow-x: hidden;
}

::selection { background: var(--color-main); color: var(--color-light); }

mark.highlight {
  background: var(--color-main);
  color: var(--color-light);
  padding: 0 0.1em;
}


/* =============================================================================
   Top nav
   ============================================================================= */

.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1.25rem 2rem;
  color: var(--color-light);
  transition: background .3s var(--ease), color .3s var(--ease), backdrop-filter .3s var(--ease);
}
.nav.solid {
  background: rgba(250, 251, 252, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  color: var(--color-dark);
  border-bottom: 1px solid var(--color-rule);
}

.brand {
  display: flex; align-items: center; gap: 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.75rem; letter-spacing: 0.16em; text-transform: uppercase;
}
.brand-mark {
  width: 22px; height: 22px;
  border: 1.5px solid currentColor;
  position: relative;
}
.brand-mark::after {
  content: ''; position: absolute; inset: 4px; background: currentColor;
}

.nav-meta {
  display: flex; gap: 1.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase;
}
.nav-meta span { opacity: 0.85; }

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: inherit; text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  cursor: pointer;
  background: none; border-left: none; border-right: none; border-top: none;
}

@media (max-width: 860px) {
  .nav { padding: 1rem 1.25rem; }
  .nav-meta { display: none; }
}


/* =============================================================================
   Hero
   ============================================================================= */

.hero {
  position: relative;
  min-height: 100vh;
  background: var(--color-dark);
  color: var(--color-light);
  overflow: hidden;
  display: flex; flex-direction: column;
}

.hero-stack { position: absolute; inset: 0; }
.hero-slide {
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity 1.2s var(--ease);
}
.hero-slide.active { opacity: 1; }

.hero-slide::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(120% 80% at 50% 30%, rgba(255,255,255,0.08), transparent 70%),
    var(--slide-bg);
}
.hero-slide::after {
  content: ''; position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(30,44,52,0.55) 0%, rgba(30,44,52,0.2) 35%, rgba(30,44,52,0.85) 100%);
}

.hero-grain {
  position: absolute; inset: 0; pointer-events: none;
  opacity: 0.18; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence baseFrequency='0.9' numOctaves='2' seed='3'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.6'/></svg>");
}

.hero-content {
  position: relative; z-index: 2;
  flex: 1;
  display: grid;
  grid-template-rows: 1fr auto;
  padding-top: 7rem;
}

.hero-title-wrap {
  align-self: end;
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding: 0 2rem 3rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(3rem, 9vw, 100px);
  line-height: 0.96;
  letter-spacing: -0.015em;
  color: var(--color-light);
  max-width: 14ch;
}
.hero-title em { font-style: italic; color: var(--color-main); }

.hero-sub {
  margin-top: 1.5rem;
  display: flex; gap: 2.5rem; align-items: flex-end;
  flex-wrap: wrap;
  width: 100%;
  justify-content: space-between;
}
.hero-sub p {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.5;
  color: rgba(250,251,252,0.78);
  max-width: 36ch;
}

.hero-scroll {
  display: inline-flex; align-items: center; gap: 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-light);
  background: none; border: none; padding: 0; cursor: pointer;
  white-space: nowrap;
}
.hero-scroll-arrow { width: 36px; height: 1px; background: currentColor; position: relative; }
.hero-scroll-arrow::after {
  content: ''; position: absolute; right: 0; top: -3px;
  width: 8px; height: 8px;
  border-right: 1px solid currentColor;
  border-top: 1px solid currentColor;
  transform: rotate(45deg);
}

.hero-rail {
  position: relative; z-index: 2;
  border-top: 1px solid rgba(250,251,252,0.18);
}
.hero-rail-inner {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 2rem;
  align-items: center;
  padding: 1.25rem 2rem;
  max-width: var(--max);
  margin-inline: auto;
  color: var(--color-light);
}
.hero-counter {
  font-family: var(--font-mono);
  font-size: 0.75rem; letter-spacing: 0.12em;
  display: flex; align-items: baseline; gap: 0.5rem;
}
.hero-counter .now { font-size: 1.5rem; line-height: 1; }
.hero-counter .sep { opacity: 0.5; }
.hero-counter .total { opacity: 0.7; }

.hero-progress { display: flex; gap: 4px; }
.hero-progress span {
  flex: 1; height: 2px;
  background: rgba(250,251,252,0.18);
  position: relative; overflow: hidden;
}
.hero-progress span.active::after {
  content: ''; position: absolute; inset: 0;
  background: var(--color-light);
  animation: rail 6s linear forwards;
}
.hero-progress span.done { background: rgba(250,251,252,0.6); }
@keyframes rail { from { transform: translateX(-100%); } to { transform: translateX(0); } }

.hero-caption {
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  opacity: 0.8; min-width: 18ch; text-align: right;
}
.hero-controls { display: flex; gap: 0.5rem; }
.hero-controls button {
  width: 38px; height: 38px;
  border: 1px solid rgba(250,251,252,0.3);
  background: transparent;
  color: var(--color-light);
  cursor: pointer;
  display: grid; place-items: center;
  transition: background .15s var(--ease), border-color .15s var(--ease);
}
.hero-controls button:hover {
  background: rgba(250,251,252,0.08);
  border-color: rgba(250,251,252,0.6);
}
.hero-controls svg { width: 12px; height: 12px; }

@media (max-width: 860px) {
  .hero-title-wrap { padding: 0 1.25rem 2rem; }
  .hero-rail-inner { grid-template-columns: auto 1fr auto; padding: 1rem 1.25rem; gap: 1rem; }
  .hero-caption { display: none; }
}


/* =============================================================================
   Marquee strip
   ============================================================================= */

.marquee {
  background: var(--color-dark);
  color: rgba(250,251,252,0.85);
  border-top: 1px solid rgba(250,251,252,0.1);
  border-bottom: 1px solid rgba(250,251,252,0.1);
  overflow: hidden;
  padding: 0.875rem 0;
}
.marquee-track {
  display: flex; gap: 3rem;
  animation: marq 38s linear infinite;
  width: max-content;
  font-family: var(--font-mono);
  font-size: 0.75rem; letter-spacing: 0.16em; text-transform: uppercase;
}
.marquee-track span { white-space: nowrap; display: inline-flex; align-items: center; gap: 3rem; }
.marquee-track span::after { content: '✦'; opacity: 0.5; }
@keyframes marq { from { transform: translateX(0); } to { transform: translateX(-50%); } }


/* =============================================================================
   Intro section
   ============================================================================= */

.intro {
  background: var(--color-paper);
  padding: 8rem 0 7rem;
  position: relative;
}
.intro-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 4rem;
  align-items: start;
}

@media (max-width: 900px) {
  .intro { padding: 4.5rem 0 4rem; }
  .intro-inner { grid-template-columns: 1fr; gap: 2.25rem; padding: 0 1.25rem; }
}

.intro-aside { display: flex; flex-direction: column; gap: 1.5rem; }
.intro-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-mute);
}
.intro-rule { width: 48px; height: 1px; background: var(--color-dark); opacity: 0.7; }
.intro-stat-row {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem 2rem;
  margin-top: 0.5rem;
}
.intro-stat .num {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  line-height: 1;
  color: var(--color-dark);
}
.intro-stat .lab {
  font-family: var(--font-mono);
  font-size: 0.65rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-mute);
  margin-top: 0.5rem;
}

.intro-body { display: flex; flex-direction: column; gap: 1.75rem; }
.intro-lead {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 3.6vw, 2.6rem);
  line-height: 1.18;
  letter-spacing: -0.005em;
  color: var(--color-dark);
  text-wrap: pretty;
}
.intro-para {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: rgba(30,44,52,0.82);
  max-width: 56ch;
}
.intro-pull {
  border-left: 2px solid var(--color-main);
  padding: 0.25rem 0 0.25rem 1.25rem;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.45;
  color: var(--color-dark);
}
.intro-meta {
  display: flex; gap: 2.5rem; flex-wrap: wrap;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-mute);
}
.intro-meta b { color: var(--color-dark); font-weight: 500; margin-right: 0.5rem; }


/* =============================================================================
   FORM — Typeform-style stepper
   ============================================================================= */

.form-section {
  position: relative;
  background: var(--color-light);
  /* full-bleed feel: this section is a self-contained "app" */
  border-top: 1px solid var(--color-rule);
}

/* --- Top progress bar --- */

.tf-topbar {
  position: sticky; top: 0;
  z-index: 20;
  background: rgba(250, 251, 252, 0.9);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-rule);
}
.tf-topbar-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 0.875rem 2rem;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 2rem;
}
.tf-chapter {
  display: inline-flex; align-items: baseline; gap: 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--color-mute);
  white-space: nowrap;
}
.tf-chapter-num {
  color: var(--color-main);
  font-weight: 500;
}
.tf-chapter-name { color: var(--color-dark); }

.tf-topbar-progress {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 1rem;
}
.tf-topbar-bar {
  height: 3px;
  background: var(--color-rule);
  position: relative;
  overflow: hidden;
}
.tf-topbar-bar i {
  position: absolute; left: 0; top: 0; bottom: 0;
  width: 0%;
  background: var(--color-main);
  transition: width .6s var(--ease);
}
.tf-topbar-count {
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.14em;
  color: var(--color-mute);
  white-space: nowrap;
}
.tf-topbar-count b { color: var(--color-dark); font-weight: 500; }

@media (max-width: 720px) {
  .tf-topbar-inner { padding: 0.75rem 1.25rem; gap: 1rem; }
  .tf-chapter-name { display: none; }
}


/* --- Stage (one step at a time) --- */

.tf-stage {
  position: relative;
  min-height: calc(100vh - 60px);
  overflow: hidden;
  /* room for sticky bottom bar */
  padding-bottom: 90px;
}

.tf-step {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 4rem 2rem;
  opacity: 0;
  transform: translateY(24px);
  pointer-events: none;
  transition: opacity .45s var(--ease), transform .45s var(--ease);
}
.tf-step.is-active {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
  position: relative;
  z-index: 2;
}
.tf-step.is-leaving {
  position: absolute;
  opacity: 0;
  transform: translateY(-24px);
  pointer-events: none;
}

@media (max-width: 720px) {
  .tf-step { padding: 3rem 1.25rem; }
  .tf-stage { padding-bottom: 80px; }
}


/* --- Card (the actual question content) --- */

.tf-card {
  width: 100%;
  max-width: 720px;
}

.tf-eyebrow {
  display: inline-flex; align-items: center; gap: 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--color-mute);
  margin-bottom: 1.75rem;
}
.tf-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-main);
  box-shadow: 0 0 0 0 rgba(98,181,229, 0.5);
  animation: pulse 2.2s var(--ease) infinite;
}

.tf-q-num {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem; letter-spacing: 0.16em;
  color: var(--color-main);
  margin-bottom: 1.25rem;
}
.tf-q-num svg { width: 12px; height: 12px; }

.tf-headline {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.875rem, 4.4vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--color-dark);
  margin-bottom: 1.25rem;
  text-wrap: balance;
}
.tf-headline em {
  font-style: italic;
  color: var(--color-main);
}
.tf-required {
  color: var(--color-main);
  margin-left: 0.2em;
  font-style: normal;
}
.tf-optional {
  display: inline-block;
  margin-left: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--color-faint);
  vertical-align: middle;
  font-style: normal;
}

.tf-sub {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--color-mute);
  margin-bottom: 2.25rem;
  max-width: 56ch;
}
.tf-sub b { color: var(--color-dark); font-weight: 500; }
.tf-counter {
  display: inline-block;
  margin-left: 0.5rem;
  padding: 0.2rem 0.6rem;
  background: var(--color-paper);
  border: 1px solid var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.12em;
  color: var(--color-mute);
}
.tf-counter b { color: var(--color-main); font-weight: 500; }
.tf-kbd-hint { color: var(--color-faint); }


/* --- Inputs --- */

.tf-input-wrap {
  margin-bottom: 0.75rem;
}
.tf-input,
.tf-textarea {
  display: block;
  width: 100%;
  appearance: none; -webkit-appearance: none;
  border: none;
  border-bottom: 2px solid var(--color-rule);
  background: transparent;
  border-radius: 0;
  padding: 0.75rem 0;
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1.3;
  color: var(--color-dark);
  outline: none;
  transition: border-color .25s var(--ease);
}
.tf-input:focus,
.tf-textarea:focus { border-bottom-color: var(--color-main); }
.tf-input::placeholder,
.tf-textarea::placeholder { color: var(--color-faint); font-style: italic; }
.tf-textarea {
  font-size: 1.25rem;
  line-height: 1.5;
  resize: vertical;
  min-height: 120px;
  padding: 1rem 0;
}

/* "Keep me updated" checkbox on optional step */
.tf-keep {
  margin: 1.5rem 0 0.5rem;
}
.tf-keep-label {
  display: inline-flex; align-items: center; gap: 0.75rem;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-mute);
  user-select: none;
}
.tf-keep-label input { position: absolute; opacity: 0; width: 1px; height: 1px; clip: rect(0,0,0,0); }
.tf-keep-box {
  width: 18px; height: 18px;
  border: 1.5px solid var(--color-faint);
  display: grid; place-items: center;
  transition: background .15s var(--ease), border-color .15s var(--ease);
}
.tf-keep-label input:checked ~ .tf-keep-box {
  background: var(--color-main); border-color: var(--color-main);
}
.tf-keep-label input:checked ~ .tf-keep-box::after {
  content: ''; width: 4px; height: 8px;
  border: 2px solid #fff; border-top: 0; border-left: 0;
  transform: rotate(45deg) translateY(-1px);
}
.tf-keep-label input:checked ~ span:last-child { color: var(--color-dark); }


/* --- Choices (radios + checkboxes) --- */

.tf-choices {
  display: flex; flex-direction: column;
  gap: 0.625rem;
  margin-bottom: 1rem;
}
.tf-choices-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
}
@media (max-width: 720px) {
  .tf-choices-grid { grid-template-columns: 1fr; }
}

.tf-choice {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.875rem;
  padding: 1rem 1.125rem;
  cursor: pointer;
  background: var(--color-light);
  border: 1.5px solid var(--color-rule);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-dark);
  user-select: none;
  transition: border-color .12s var(--ease), background .12s var(--ease), transform .15s var(--ease);
}
.tf-choice:hover {
  border-color: var(--color-dark);
  background: var(--color-paper);
}
.tf-choice:active { transform: scale(0.995); }

.tf-choice input {
  position: absolute; opacity: 0; pointer-events: none;
  width: 1px; height: 1px; clip: rect(0,0,0,0);
}

.tf-key {
  flex-shrink: 0;
  display: inline-grid;
  place-items: center;
  width: 26px; height: 26px;
  border: 1.5px solid var(--color-rule);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--color-mute);
  background: var(--color-light);
  transition: all .12s var(--ease);
}
.tf-choice:hover .tf-key {
  border-color: var(--color-dark);
  color: var(--color-dark);
}

.tf-choice-text {
  line-height: 1.35;
}

.tf-tick {
  flex-shrink: 0;
  width: 22px; height: 22px;
  border: 1.5px solid var(--color-rule);
  display: grid; place-items: center;
  transition: background .15s var(--ease), border-color .15s var(--ease);
}

/* checkbox tick */
.tf-choice input[type="checkbox"]:checked ~ .tf-tick {
  background: var(--color-main);
  border-color: var(--color-main);
}
.tf-choice input[type="checkbox"]:checked ~ .tf-tick::after {
  content: ''; width: 5px; height: 9px;
  border: 2px solid #fff; border-top: 0; border-left: 0;
  transform: rotate(45deg) translateY(-1px);
}
/* radio fill */
.tf-choice input[type="radio"] ~ .tf-tick { border-radius: 50%; }
.tf-choice input[type="radio"]:checked ~ .tf-tick {
  border-color: var(--color-main);
}
.tf-choice input[type="radio"]:checked ~ .tf-tick::after {
  content: ''; width: 10px; height: 10px; border-radius: 50%;
  background: var(--color-main);
}

/* selected card state */
.tf-choice:has(input:checked) {
  border-color: var(--color-main);
  background: rgba(98, 181, 229, 0.06);
}
.tf-choice:has(input:checked) .tf-key {
  background: var(--color-main);
  border-color: var(--color-main);
  color: var(--color-light);
}

/* disabled (q3 max reached) */
.tf-choice.is-disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.tf-choice.is-disabled:hover {
  border-color: var(--color-rule);
  background: var(--color-light);
}


/* --- Actions row (button + hint) --- */

.tf-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 1.75rem;
  flex-wrap: wrap;
}

.tf-btn {
  display: inline-flex; align-items: center; gap: 0.875rem;
  background: var(--color-dark);
  color: var(--color-light);
  border: none; border-radius: 0;
  padding: 1rem 1.625rem;
  font-family: var(--font-mono);
  font-size: 0.7rem; font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: background .15s var(--ease), transform .15s var(--ease);
}
.tf-btn:hover { background: #0F1A22; transform: translateY(-1px); }
.tf-btn:active { transform: translateY(0); }
.tf-btn:disabled { opacity: 0.5; cursor: not-allowed; }
.tf-btn svg { width: 14px; height: 14px; }

.tf-btn-primary {
  background: var(--color-main);
  color: var(--color-dark);
}
.tf-btn-primary:hover { background: var(--color-main); filter: brightness(0.95); }

.tf-btn-ghost {
  background: none;
  border: none;
  color: var(--color-mute);
  font-family: var(--font-mono);
  font-size: 0.7rem; font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  cursor: pointer;
  padding: 0.5rem 0;
  border-bottom: 1px solid transparent;
  transition: color .15s var(--ease), border-color .15s var(--ease);
}
.tf-btn-ghost:hover {
  color: var(--color-dark);
  border-bottom-color: var(--color-dark);
}

.tf-hint {
  font-family: var(--font-mono);
  font-size: 0.65rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-faint);
}
.tf-hint kbd {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--color-rule);
  background: var(--color-paper);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-mute);
  margin: 0 0.15rem;
}


/* --- Errors --- */

.tf-error {
  display: none;
  margin-top: 1rem;
  padding: 0.625rem 0.875rem;
  background: rgba(192, 57, 43, 0.08);
  border-left: 2px solid #c0392b;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: #c0392b;
}
.tf-error.is-visible { display: block; }

.tf-submit-error {
  margin-top: 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: #c0392b;
}


/* --- Done card --- */

.tf-card-done {
  text-align: left;
}
.tf-done-mark {
  display: inline-grid;
  place-items: center;
  width: 64px; height: 64px;
  margin-bottom: 1.5rem;
  color: var(--color-main);
}
.tf-done-mark svg { width: 100%; height: 100%; }


/* --- Bottom sticky nav --- */

.tf-bottom {
  position: sticky;
  bottom: 0;
  z-index: 20;
  background: rgba(250, 251, 252, 0.9);
  backdrop-filter: saturate(140%) blur(10px);
  border-top: 1px solid var(--color-rule);
}
.tf-bottom-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 0.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.tf-bottom-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-mute);
}
.tf-bottom-meta kbd {
  display: inline-block;
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--color-rule);
  background: var(--color-light);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-mute);
  margin: 0 0.15rem;
}
.tf-bottom-controls {
  display: flex;
  gap: 0.375rem;
}
.tf-nav-btn {
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border: 1px solid var(--color-rule);
  background: var(--color-light);
  color: var(--color-dark);
  cursor: pointer;
  transition: border-color .12s var(--ease), background .12s var(--ease), opacity .12s var(--ease);
}
.tf-nav-btn:hover {
  border-color: var(--color-dark);
  background: var(--color-paper);
}
.tf-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  border-color: var(--color-rule);
  background: transparent;
}
.tf-nav-btn svg { width: 14px; height: 14px; }

@media (max-width: 720px) {
  .tf-bottom-inner { padding: 0.625rem 1.25rem; }
  .tf-bottom-meta { font-size: 0.65rem; }
}


/* =============================================================================
   Footer
   ============================================================================= */

.footer {
  background: var(--color-dark);
  color: rgba(250,251,252,0.7);
  padding: 4.5rem 0 2rem;
}
.footer-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  border-bottom: 1px solid rgba(250,251,252,0.12);
  padding-bottom: 3rem;
}
@media (max-width: 720px) {
  .footer-inner { grid-template-columns: 1fr; padding: 0 1.25rem 2.5rem; gap: 2rem; }
}
.footer-mark {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  line-height: 1.1;
  color: var(--color-light);
}
.footer-bottom {
  max-width: var(--max);
  margin-inline: auto;
  padding: 1.5rem 2rem 0;
  display: flex; justify-content: space-between; gap: 1rem;
  font-family: var(--font-mono);
  font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: rgba(250,251,252,0.5);
  flex-wrap: wrap;
}
@media (max-width: 720px) { .footer-bottom { padding: 1.5rem 1.25rem 0; } }


/* =============================================================================
   Reveal animation
   ============================================================================= */

.reveal { opacity: 0; transform: translateY(14px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.in { opacity: 1; transform: none; }


/* =============================================================================
   Pulse keyframe
   ============================================================================= */

@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(98,181,229, 0.5); }
  70%  { box-shadow: 0 0 0 10px rgba(98,181,229, 0); }
  100% { box-shadow: 0 0 0 0 rgba(98,181,229, 0); }
}


/* =============================================================================
   Reduced motion
   ============================================================================= */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}