/* ===================================================================
   QRGenPro — Application Stylesheet
   Design language: "scanner viewfinder" — ink/paper palette with a
   signal-amber accent, monospace display type paired with Inter body.
   =================================================================== */

/* -------------------- Design tokens -------------------- */
:root {
  /* Color */
  --ink: #14213D;
  --ink-soft: #232C4A;
  --paper: #FAF8F3;
  --paper-dim: #F0ECE1;
  --amber: #FFC53D;
  --amber-ink: #4A3400;
  --teal: #2FB88B;
  --slate: #5C6178;
  --danger: #D8393F;

  --bg: var(--paper);
  --bg-elevated: #FFFFFF;
  --text: var(--ink);
  --text-muted: var(--slate);
  --border: #E4DFD2;
  --accent: var(--amber);
  --accent-ink: var(--amber-ink);
  --focus-ring: #2F6FED;

  /* Type */
  --font-display: 'Space Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Layout */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-card: 0 1px 2px rgba(20, 33, 61, 0.06), 0 8px 24px rgba(20, 33, 61, 0.06);
  --header-h: 64px;
  --max-width: 1180px;

  --transition-fast: 150ms ease;
  --transition-med: 260ms cubic-bezier(.2, .7, .3, 1);
}

[data-theme="dark"] {
  --bg: #0F1524;
  --bg-elevated: #1B2338;
  --text: #F3F1EA;
  --text-muted: #A6AEC7;
  --border: #2B3350;
  --paper: #1B2338;
  --paper-dim: #232C4A;
  --ink: #F3F1EA;
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.3), 0 12px 28px rgba(0, 0, 0, 0.35);
}

/*--------------------- Fonts ---------------------------*/
/* ===== INTER FONTS ===== */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/inter/inter-v20-latin-regular.woff2') format('woff2'),
       url('../assets/fonts/inter/inter-v20-latin-regular.woff') format('woff');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../assets/fonts/inter/inter-v20-latin-500.woff2') format('woff2'),
       url('../assets/fonts/inter/inter-v20-latin-500.woff') format('woff');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../assets/fonts/inter/inter-v20-latin-600.woff2') format('woff2'),
       url('../assets/fonts/inter/inter-v20-latin-600.woff') format('woff');
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../assets/fonts/inter/inter-v20-latin-700.woff2') format('woff2'),
       url('../assets/fonts/inter/inter-v20-latin-700.woff') format('woff');
}

/* ===== SPACE MONO FONTS ===== */
@font-face {
  font-family: 'Space Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../assets/fonts/space-mono/space-mono-v17-latin-regular.woff2') format('woff2'),
       url('../assets/fonts/space-mono/space-mono-v17-latin-regular.woff') format('woff');
}

@font-face {
  font-family: 'Space Mono';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../assets/fonts/space-mono/space-mono-v17-latin-700.woff2') format('woff2'),
       url('../assets/fonts/space-mono/space-mono-v17-latin-700.woff') format('woff');
}

/* ===== APPLY FONTS ===== */
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

code, pre, .mono {
  font-family: 'Space Mono', 'Courier New', monospace;
}

/* -------------------- Reset & base -------------------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition-med), color var(--transition-med);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  line-height: 1.1;
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}

p {
  margin: 0 0 1em;
  color: var(--text);
}

a {
  color: inherit;
}

.w3-hide {
  position: absolute !important;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 999;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 12px 18px;
  border-radius: 0 0 8px 0;
  font-weight: 700;
}

.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

/* -------------------- Header -------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
}

.brand-mark {
  display: inline-flex;
  color: var(--accent);
}

.brand-word {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
}

.brand-word em {
  font-style: normal;
  color: var(--accent-ink);
  background: var(--accent);
  padding: 0 4px;
  border-radius: 3px;
}

.header-nav {
  display: flex;
  gap: 28px;
}

.header-nav a {
  text-decoration: none;
  font-size: .92rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.header-nav a:hover {
  color: var(--text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  position: relative;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.icon-btn:hover {
  transform: translateY(-1px);
}

.icon-btn:active {
  transform: translateY(0);
}

.icon-moon {
  display: none;
}

[data-theme="dark"] .icon-sun {
  display: none;
}

[data-theme="dark"] .icon-moon {
  display: block;
}

/* Tooltip */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  font-size: .72rem;
  padding: 6px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 20;
}

[data-theme="dark"] [data-tooltip]::after {
  background: var(--paper-dim);
  color: var(--text);
}

[data-tooltip]:hover::after,
[data-tooltip]:focus-visible::after {
  opacity: 1;
}

/* -------------------- Buttons -------------------- */
.w3-button {
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: .92rem;
  padding: 11px 20px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.w3-button:hover {
  transform: translateY(-1px);
}

.w3-button:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  background: #FFD26B;
}

.btn-primary:disabled {
  opacity: .5;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  border-color: var(--text-muted);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: transparent;
}

.btn-ghost:hover {
  color: var(--text);
  background: var(--paper-dim);
}

/* -------------------- Hero -------------------- */
.hero {
  padding: 64px 20px 40px;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(2.1rem, 4.2vw, 3.4rem);
}

.hero-sub {
  max-width: 46ch;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.hero-cta {
  display: flex;
  gap: 12px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.viewfinder--hero {
  width: min(280px, 70vw);
  aspect-ratio: 1;
}

.hero-qr-static {
  position: absolute;
  inset: 22%;
  color: var(--ink);
  opacity: .9;
}

/* -------------------- Viewfinder (signature element) -------------------- */
.viewfinder {
  position: relative;
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.corner {
  position: absolute;
  width: 26px;
  height: 26px;
  border: 3px solid var(--accent);
}

.corner-tl {
  top: 12px;
  left: 12px;
  border-right: none;
  border-bottom: none;
  border-top-left-radius: 8px;
}

.corner-tr {
  top: 12px;
  right: 12px;
  border-left: none;
  border-bottom: none;
  border-top-right-radius: 8px;
}

.corner-bl {
  bottom: 12px;
  left: 12px;
  border-right: none;
  border-top: none;
  border-bottom-left-radius: 8px;
}

.corner-br {
  bottom: 12px;
  right: 12px;
  border-left: none;
  border-top: none;
  border-bottom-right-radius: 8px;
}

.scanline {
  position: absolute;
  left: 6%;
  right: 6%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent) 20%, var(--accent) 80%, transparent);
  box-shadow: 0 0 12px 2px var(--accent);
  animation: sweep 1.6s ease-in-out infinite;
}

@keyframes sweep {
  0% {
    top: 8%;
    opacity: 0;
  }

  10% {
    opacity: 1;
  }

  90% {
    opacity: 1;
  }

  100% {
    top: 92%;
    opacity: 0;
  }
}

/* -------------------- Builder layout -------------------- */
.builder {
  padding: 24px 20px 80px;
}

.builder-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 28px;
  align-items: start;
}

.panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: 20px;
  margin-bottom: 18px;
}

/* Type tabs */
.type-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}

.type-tab {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: .85rem;
  background: var(--paper-dim);
  color: var(--text-muted);
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast);
}

.type-tab:hover {
  color: var(--text);
}

.type-tab.is-active {
  background: var(--ink);
  color: var(--paper);
}

[data-theme="dark"] .type-tab.is-active {
  background: var(--accent);
  color: var(--accent-ink);
}

.type-fields {
  display: none;
  flex-direction: column;
  gap: 4px;
}

.type-fields.is-active {
  display: flex;
}

label {
  font-size: .85rem;
  font-weight: 600;
  margin-top: 12px;
  margin-bottom: 6px;
  display: block;
}

label:first-child {
  margin-top: 0;
}

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

input[type="text"],
input[type="url"],
input[type="email"],
input[type="tel"],
textarea,
select {
  width: 100%;
  font-family: var(--font-body);
  font-size: .95rem;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  transition: border-color var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--accent);
}

textarea {
  resize: vertical;
  font-family: var(--font-body);
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  cursor: pointer;
}

.checkbox-row input {
  width: auto;
}

.field-hint {
  font-size: .78rem;
  color: var(--text-muted);
  margin: 6px 0 0;
}

.error-message {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--danger) 12%, transparent);
  color: var(--danger);
  font-size: .85rem;
  font-weight: 600;
}

/* Accordion */
.accordion summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .95rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 0;
}

.accordion summary::-webkit-details-marker {
  display: none;
}

.chev {
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(-45deg);
  transition: transform var(--transition-fast);
}

.accordion[open] .chev {
  transform: rotate(45deg);
}

.accordion-body {
  padding-top: 16px;
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 20px;
}

.field {
  min-width: 0;
}

.field label {
  display: flex;
  justify-content: space-between;
  gap: 6px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.color-field {
  display: flex;
  align-items: center;
  gap: 8px;
}

input[type="color"] {
  width: 40px;
  height: 38px;
  padding: 2px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  cursor: pointer;
}

.color-field input[type="text"] {
  font-family: var(--font-display);
  text-transform: uppercase;
}

.logo-upload {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

#logo-filename {
  font-size: .82rem;
  color: var(--text-muted);
}

.download-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 6px;
}

.form-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* -------------------- Preview column -------------------- */
.builder-preview {
  position: relative;
}

.preview-sticky {
  position: sticky;
  top: calc(var(--header-h) + 20px);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

#viewfinder {
  width: 100%;
  aspect-ratio: 1;
  max-width: 420px;
}

.qr-canvas {
  display: flex;
  align-items: center;
  justify-content: center;
}

.qr-canvas canvas,
.qr-canvas svg,
.qr-canvas img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.empty-state {
  color: var(--text-muted);
  text-align: center;
  font-size: .9rem;
  max-width: 220px;
  margin: 0;
}

.preview-caption {
  font-size: .82rem;
  color: var(--text-muted);
  text-align: center;
  margin: 0;
}

/* Loading state */
.viewfinder.is-loading .scanline {
  display: block !important;
}

.viewfinder.is-ready .corner {
  border-color: var(--teal);
  transition: border-color var(--transition-med);
}

/* -------------------- How it works -------------------- */
.how {
  padding: 20px 20px 90px;
}

.how h2 {
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto 32px;
}

.how-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.how-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
}

.how-index {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--accent-ink);
  background: var(--accent);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .78rem;
  margin-bottom: 12px;
}

.how-card p {
  margin: 0;
  color: var(--text-muted);
}

/* -------------------- Footer -------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 20px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.footer-inner p {
  margin: 0;
  font-size: .82rem;
  color: var(--text-muted);
}

.footer-inner nav {
  font-size: .82rem;
  color: var(--text-muted);
  flex-basis: 100%;
  order: 3;
  text-align: center;
}

.footer-inner nav a {
  text-decoration: none;
  color: var(--text-muted);
}

.footer-inner nav a:hover {
  color: var(--text);
  text-decoration: underline;
}

/* -------------------- Toasts -------------------- */
.toast-region {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 999;
  max-width: min(340px, 90vw);
}

.toast {
  background: var(--ink);
  color: var(--paper);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toast-in var(--transition-med);
}

.toast.toast-success {
  border-left: 4px solid var(--teal);
}

.toast.toast-error {
  border-left: 4px solid var(--danger);
}

.toast.toast-info {
  border-left: 4px solid var(--accent);
}

.toast.is-leaving {
  animation: toast-out var(--transition-fast) forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateY(8px);
  }
}

/* -------------------- Responsive -------------------- */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }

  .builder-grid {
    grid-template-columns: 1fr;
  }

  .builder-preview {
    order: -1;
  }

  .preview-sticky {
    position: static;
  }

  .header-nav {
    display: none;
  }

  .how-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .field-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 40px 16px 28px;
  }

  .download-row {
    flex-direction: column;
  }

  .download-row .w3-button {
    width: 100%;
  }
}

/* -------------------- Print (QR code should print cleanly) -------------------- */
@media print {
  .site-header,
  .site-footer,
  .builder-controls,
  .hero,
  .how,
  .toast-region,
  .skip-link {
    display: none !important;
  }

  .builder-preview,
  .preview-sticky {
    position: static !important;
  }

  #viewfinder {
    box-shadow: none;
    border: none;
  }
}