*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #e8ecf2;
  --surface: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow-card: 0 8px 32px rgba(0,0,0,.10), 0 2px 8px rgba(0,0,0,.06);
  --shadow-lift: 0 20px 48px rgba(0,0,0,.13), 0 4px 12px rgba(0,0,0,.08);
}

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.hidden { display: none !important; }

/* ── VIEWS ── */
.view { min-height: 100vh; }

/* ── LOGIN ── */
#loginView {
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  /* subtelna faktura tła */
  background-image:
    radial-gradient(ellipse at 20% 30%, rgba(255,255,255,.07) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 70%, rgba(0,0,0,.15) 0%, transparent 60%),
    linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
}

.login-box {
  background: rgba(255,255,255,.97);
  border-radius: 20px;
  box-shadow:
    0 24px 64px rgba(0,0,0,.22),
    0 6px 16px rgba(0,0,0,.10),
    inset 0 1px 0 rgba(255,255,255,.9);
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 380px;
  transform: translateY(0) rotateX(0deg);
  transition: transform .3s ease, box-shadow .3s ease;
}

.login-box:hover {
  transform: translateY(-4px);
  box-shadow:
    0 32px 72px rgba(0,0,0,.26),
    0 8px 20px rgba(0,0,0,.12),
    inset 0 1px 0 rgba(255,255,255,.9);
}

.login-box h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.75rem;
  text-align: center;
  color: var(--primary);
}

/* ── HEADER ── */
header {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,.6);
  padding: .9rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
}

.header-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
}

/* ── MAIN LAYOUT ── */
main {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 1.5rem;
  padding: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
  perspective: 1200px;   /* kontekst 3D dla sekcji */
}

@media (max-width: 820px) {
  main { grid-template-columns: 1fr; }
}

section {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 1.75rem;
  /* lekkie uniesienie */
  transform: translateY(0) translateZ(0);
  transition: transform .25s ease, box-shadow .25s ease;
  border: 1px solid rgba(255,255,255,.8);
  position: relative;
  /* cienki górny highlight jak szkło */
  background: linear-gradient(160deg, rgba(255,255,255,1) 0%, rgba(245,248,255,1) 100%);
}

section::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  border-top: 1.5px solid rgba(255,255,255,.95);
  border-left: 1px solid rgba(255,255,255,.6);
  pointer-events: none;
}

section:hover {
  transform: translateY(-3px) translateZ(0);
  box-shadow: var(--shadow-lift);
}

section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text);
}

/* ── FORMS ── */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: .35rem;
}

.form-group input[type="text"],
.form-group input[type="url"],
.form-group input[type="password"],
.form-group select {
  width: 100%;
  padding: .6rem .85rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
  color: var(--text);
  background: #fff;
  transition: border-color .15s, box-shadow .15s;
  outline: none;
  box-shadow: inset 0 2px 4px rgba(0,0,0,.04);
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--primary);
  box-shadow: inset 0 2px 4px rgba(0,0,0,.04), 0 0 0 3px rgba(37,99,235,.12);
}

/* ── LOGO UPLOAD ── */
.logo-upload-row {
  display: flex;
  align-items: center;
  gap: .6rem;
  flex-wrap: wrap;
}

.upload-label {
  cursor: pointer;
  white-space: nowrap;
  padding: .45rem .9rem !important;
  font-size: .875rem !important;
}

#logoFileName {
  font-size: .85rem;
  color: var(--muted);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── BUTTONS ── */
.btn-primary {
  background: linear-gradient(180deg, #3b82f6 0%, #2563eb 60%, #1d4ed8 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: .65rem 1.4rem;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  position: relative;
  box-shadow:
    0 4px 14px rgba(37,99,235,.45),
    inset 0 1px 0 rgba(255,255,255,.25);
  transition: transform .15s ease, box-shadow .15s ease, filter .15s;
}
.btn-primary:hover {
  filter: brightness(1.07);
  transform: translateY(-2px);
  box-shadow:
    0 8px 22px rgba(37,99,235,.5),
    inset 0 1px 0 rgba(255,255,255,.25);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow:
    0 2px 6px rgba(37,99,235,.35),
    inset 0 1px 0 rgba(255,255,255,.15);
}

.btn-secondary {
  background: #fff;
  color: var(--primary);
  border: 1.5px solid var(--primary);
  border-radius: 8px;
  padding: .6rem 1.2rem;
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(37,99,235,.10);
  transition: transform .15s ease, box-shadow .15s ease, background .15s;
}
.btn-secondary:hover {
  background: #eff6ff;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37,99,235,.18);
}
.btn-secondary:active {
  transform: translateY(1px);
  box-shadow: 0 1px 4px rgba(37,99,235,.12);
}

.btn-text {
  background: none;
  border: none;
  color: var(--danger);
  font-size: .85rem;
  cursor: pointer;
  padding: .2rem .4rem;
  border-radius: 4px;
}
.btn-text:hover { background: #fee2e2; }

.btn-logout {
  background: none;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: .4rem .9rem;
  font-size: .85rem;
  cursor: pointer;
  color: var(--muted);
  transition: border-color .15s, color .15s, transform .15s;
}
.btn-logout:hover {
  border-color: var(--danger);
  color: var(--danger);
  transform: translateY(-1px);
}

.btn-row { margin-top: 1.25rem; }

.error {
  color: var(--danger);
  font-size: .85rem;
  margin-bottom: .75rem;
}

/* ── PREVIEW ── */
.preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
}

/* ── QR CARD ── */
#outputWrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  width: 100%;
}

#qrCard {
  background: #fff;
  border-radius: 20px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  width: fit-content;
  position: relative;
  /* wielowarstwowy cień dający efekt uniesienia */
  box-shadow:
    0 2px 0 rgba(0,0,0,.04),
    0 4px 0 rgba(0,0,0,.03),
    0 8px 24px rgba(0,0,0,.09),
    0 20px 48px rgba(0,0,0,.07);
  border: 1px solid rgba(230,235,245,1);
  /* highlight */
  background: linear-gradient(160deg, #fff 0%, #f7f9ff 100%);
  transition: transform .3s ease, box-shadow .3s ease;
  transform-style: preserve-3d;
}

#qrCard::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 20px;
  border-top: 1.5px solid rgba(255,255,255,1);
  border-left: 1px solid rgba(255,255,255,.7);
  pointer-events: none;
}

#qrCard:hover {
  transform: translateY(-6px) rotateX(2deg);
  box-shadow:
    0 2px 0 rgba(0,0,0,.04),
    0 4px 0 rgba(0,0,0,.03),
    0 16px 40px rgba(0,0,0,.13),
    0 32px 64px rgba(0,0,0,.09);
}

/* Logo area */
#logoArea {
  width: 100%;
  display: flex;
  justify-content: center;
}

#logoImg {
  max-height: 80px;
  max-width: 240px;
  object-fit: contain;
}

#logoPlaceholder {
  width: 200px;
  height: 64px;
  border: 2px dashed #cbd5e1;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #94a3b8;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .08em;
  background: #f8fafc;
}

/* QR area */
#qrArea {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: .5rem;
  border-radius: 12px;
  box-shadow:
    inset 0 2px 6px rgba(0,0,0,.05),
    0 1px 0 rgba(255,255,255,.9);
  background: #fafbff;
}

#qrcode canvas,
#qrcode img {
  display: block;
  border-radius: 4px;
}

/* Caption */
#captionArea {
  width: 100%;
  text-align: center;
  min-height: 1.4rem;
}

#captionText {
  font-size: .9rem;
  color: var(--muted);
  word-break: break-all;
}

/* Download row */
.download-row {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  justify-content: center;
}