/* Reset & base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --theme: #507c9b;
  --theme-dark: #40637c;
  --radius: 12px;
  --shadow: 0 2px 12px rgba(0,0,0,.1);
  --gap: 16px;
  --bg: #f0f2f5;
  --surface: #ffffff;
  --border: #d8d8d8;
  --text: #1a1a1a;
  --text-muted: #666;
  --input-bg: #f8f8f8;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Header */
#site-header {
  background: #507c9b;
  color: #fff;
  padding: 16px var(--gap);
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 0 24px rgba(80, 124, 155, 0.55), 0 2px 8px rgba(0,0,0,.4);
  position: sticky;
  top: 0;
  z-index: 10;
}

#header-title {
  flex: 1;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .02em;
}

/* Mode toggle */
#mode-toggle {
  display: flex;
  background: rgba(255,255,255,.2);
  border-radius: 20px;
  overflow: hidden;
}

.mode-btn {
  border: none;
  background: transparent;
  color: rgba(255,255,255,.75);
  font-size: .85rem;
  font-weight: 600;
  padding: 6px 14px;
  cursor: pointer;
  transition: background .2s, color .2s;
  white-space: nowrap;
}
.mode-btn.active {
  background: rgba(255,255,255,.95);
  color: #507c9b;
  border-radius: 20px;
}

/* Main layout */
main {
  flex: 1;
  padding: var(--gap);
  max-width: 900px;
  width: 100%;
  margin: 0 auto;
}

/* Panels */
.panel { display: none; }
.panel.active { display: block; }

/* Card */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: var(--gap);
}

.card-title {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: 14px;
}

/* Form fields */
.field-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.field-row:last-child { margin-bottom: 0; }

.field-icon {
  font-size: 1.25rem;
  width: 32px;
  text-align: center;
  flex-shrink: 0;
}

.field-row label {
  display: none; /* shown via placeholder */
}

.field-row input[type="text"],
.field-row input[type="email"],
.field-row input[type="url"],
.field-row input[type="tel"],
.field-row textarea {
  flex: 1;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: .95rem;
  outline: none;
  transition: border-color .2s;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--text);
}
.field-row input:focus,
.field-row textarea:focus {
  border-color: var(--theme);
}
.field-row textarea {
  resize: vertical;
  min-height: 72px;
}

/* Settings */
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.settings-row:last-child { margin-bottom: 0; }

.settings-label {
  font-size: .95rem;
  font-weight: 500;
}

#color-hex-input {
  width: 110px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: .9rem;
  font-family: monospace;
  background: var(--input-bg);
  color: var(--text);
  outline: none;
  transition: border-color .2s;
}
#color-hex-input:focus { border-color: var(--theme); }

.field-prefix {
  font-size: .85rem;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* Stacked field row for long-prefix fields (LinkedIn, GitHub) */
.field-row-stacked {
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}
.field-row-stacked .field-row-top {
  display: flex;
  align-items: center;
  gap: 10px;
}
.field-row-stacked .field-row-top label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-muted);
}
.field-row-stacked .field-row-bottom {
  display: flex;
  align-items: stretch;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--input-bg);
  transition: border-color .2s;
}
.field-row-stacked .field-row-bottom:focus-within {
  border-color: var(--theme);
}
.field-row-stacked .field-prefix {
  padding: 10px 10px;
  font-size: .82rem;
  color: var(--text-muted);
  background: var(--input-bg);
  border-right: 1.5px solid var(--border);
  display: flex;
  align-items: center;
}
.field-row-stacked input[type="text"] {
  flex: 1;
  border: none;
  border-radius: 0;
  background: transparent;
  padding: 10px 12px;
  font-size: .95rem;
  outline: none;
  font-family: inherit;
  color: var(--text);
  min-width: 0;
}

.btn-sm {
  border: none;
  background: var(--theme);
  color: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background .2s;
}
.btn-sm:hover { background: var(--theme-dark); }

/* QR viewer (mobile-first) */
#qr-panel {
  display: none;
  flex-direction: column;
  align-items: center;
}
#qr-panel.active { display: flex; }

#qr-counter {
  font-size: .85rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  font-weight: 500;
}

#qr-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px 24px;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

#qr-field-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--theme);
  text-align: center;
}

#qr-field-value {
  font-size: .85rem;
  color: var(--text-muted);
  text-align: center;
  word-break: break-all;
  max-width: 280px;
}

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

#qr-canvas-wrapper canvas {
  border-radius: 8px;
  max-width: 100%;
}

#qr-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 8px;
}

.nav-btn {
  background: var(--theme);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 52px;
  height: 52px;
  font-size: 1.4rem;
  cursor: pointer;
  transition: background .2s, transform .1s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-btn:hover { background: var(--theme-dark); }
.nav-btn:active { transform: scale(.93); }
.nav-btn:disabled { background: #ccc; cursor: default; }

#qr-empty {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 48px 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: .95rem;
  width: 100%;
  max-width: 380px;
}
#qr-empty .empty-icon { font-size: 2.5rem; margin-bottom: 12px; }

/* Download button */
#btn-download {
  margin-top: 12px;
  background: transparent;
  border: 2px solid var(--theme);
  color: var(--theme);
  border-radius: 8px;
  padding: 8px 20px;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, color .2s;
}
#btn-download:hover { background: var(--theme); color: #fff; }

/* Desktop enhancements */
@media (min-width: 640px) {
  #qr-card { max-width: 460px; }
  #qr-canvas-wrapper canvas { width: 300px !important; height: 300px !important; }
}