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

:root {
  --primary:   #6c63ff;
  --primary-d: #4b44cc;
  --secondary: #ff6584;
  --bg:        #f5f5fa;
  --surface:   #ffffff;
  --border:    #e0e0ef;
  --text:      #2d2d3a;
  --text-muted:#7a7a9d;
  --radius:    12px;
  --shadow:    0 4px 24px rgba(108,99,255,.12);
}

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

/* ===== NAV ===== */
nav {
  background: var(--surface);
  box-shadow: 0 2px 12px rgba(0,0,0,.07);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 60px;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav .logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  white-space: nowrap;
}

nav a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  transition: color .2s;
}

nav a:hover, nav a.active { color: var(--primary); }

/* ===== HERO / LANDING ===== */
.hero {
  text-align: center;
  padding: 4rem 1rem 2rem;
}

.hero h1 {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: .75rem;
}

.hero span.gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--text-muted);
  font-size: 1.1rem;
  max-width: 520px;
  margin: 0 auto 2rem;
}

/* ===== CARD GRID (landing) ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  transition: transform .2s, box-shadow .2s;
  box-shadow: var(--shadow);
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(108,99,255,.18);
}

.tool-card .icon {
  font-size: 2.4rem;
}

.tool-card h2 {
  font-size: 1.2rem;
}

.tool-card p {
  color: var(--text-muted);
  font-size: .92rem;
  line-height: 1.5;
}

/* ===== PAGE LAYOUT ===== */
.page-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.page-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: .4rem;
}

.page-subtitle {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* ===== PANEL (white card) ===== */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.5rem;
}

.panel h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.1rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .05em;
  font-size: .78rem;
}

/* ===== FORM ELEMENTS ===== */
.form-group {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  margin-bottom: 1rem;
}

.form-group:last-child { margin-bottom: 0; }

label {
  font-size: .9rem;
  font-weight: 500;
}

input[type="text"],
input[type="url"],
input[type="number"],
select,
textarea {
  width: 100%;
  padding: .6rem .85rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
  background: var(--bg);
  color: var(--text);
  transition: border-color .2s, box-shadow .2s;
  outline: none;
}

input[type="text"]:focus,
input[type="url"]:focus,
input[type="number"]:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(108,99,255,.14);
}

input[type="color"] {
  width: 48px;
  height: 36px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 2px;
  background: var(--bg);
  cursor: pointer;
}

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

/* ===== COLOR ROW ===== */
.color-row {
  display: flex;
  align-items: center;
  gap: .75rem;
}

.color-row span {
  font-size: .88rem;
  color: var(--text-muted);
}

/* ===== SHAPE OPTIONS ===== */
.shape-options {
  display: flex;
  gap: .6rem;
  flex-wrap: wrap;
}

.shape-btn {
  padding: .4rem .85rem;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  cursor: pointer;
  font-size: .88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all .2s;
}

.shape-btn.active,
.shape-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(108,99,255,.07);
}

/* ===== BUTTON ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.4rem;
  border: none;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover { background: var(--primary-d); }

.btn-secondary {
  background: var(--bg);
  color: var(--primary);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover { border-color: var(--primary); background: rgba(108,99,255,.06); }

.btn-danger {
  background: #fff0f3;
  color: var(--secondary);
  border: 1.5px solid #ffd6de;
}

.btn-danger:hover { background: #ffe0e8; }

.btn:disabled {
  opacity: .5;
  cursor: not-allowed;
}

.btn-row {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-top: 1.25rem;
}

/* ===== TWO-COLUMN LAYOUT ===== */
.two-col {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; }
}

/* ===== QR PREVIEW ===== */
#qr-preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

#qr-canvas-container {
  position: relative;
  display: inline-block;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}

#qr-canvas-container canvas,
#qr-canvas-container img {
  display: block;
  max-width: 100%;
}

#qr-overlay-img {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  border-radius: 6px;
  background: white;
  padding: 3px;
}

/* ===== IMAGE TOOL LAYOUT ===== */
.img-tool-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 720px) {
  .img-tool-layout { grid-template-columns: 1fr; }
}

/* ===== DROP ZONE ===== */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
  background: var(--bg);
}

.drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(108,99,255,.06);
}

.drop-zone .dz-icon { font-size: 2.5rem; display: block; margin-bottom: .5rem; }
.drop-zone p { color: var(--text-muted); font-size: .92rem; }
.drop-zone strong { color: var(--primary); }

/* ===== IMAGE PREVIEW ===== */
.img-preview-box {
  display: none;
  background: #f0f0f8;
  border-radius: var(--radius);
  overflow: hidden;
  text-align: center;
  padding: 1rem;
}

.img-preview-box img,
.img-preview-box canvas {
  max-width: 100%;
  max-height: 340px;
  object-fit: contain;
  border-radius: 8px;
  display: block;
  margin: 0 auto;
}

.img-preview-box .img-meta {
  font-size: .82rem;
  color: var(--text-muted);
  margin-top: .6rem;
}

/* ===== TABS ===== */
.tabs {
  display: flex;
  gap: .25rem;
  border-bottom: 2px solid var(--border);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  padding: .55rem 1.1rem;
  border: none;
  background: none;
  cursor: pointer;
  font-size: .92rem;
  font-weight: 500;
  color: var(--text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all .2s;
  border-radius: 6px 6px 0 0;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

.tab-pane { display: none; }
.tab-pane.active { display: block; }

/* ===== STATUS / TOAST ===== */
.status-bar {
  display: none;
  padding: .65rem 1rem;
  border-radius: 8px;
  font-size: .9rem;
  font-weight: 500;
  margin-top: .75rem;
}

.status-bar.info  { background: #e8eaff; color: var(--primary); display: block; }
.status-bar.ok    { background: #e6f9f0; color: #1a8a55; display: block; }
.status-bar.error { background: #fff0f3; color: #c0392b; display: block; }

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: .85rem;
  border-top: 1px solid var(--border);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .hero h1 { font-size: 1.9rem; }
  nav { gap: 1rem; padding: 0 1rem; }
  .page-container { padding: 1.25rem 1rem 3rem; }
}