/* =============================================
   Smart Digital QR Generator — style.css
   ============================================= */

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --accent: #f97316;
  --green: #10b981;
  --bg: #0f172a;
  --surface: #1e293b;
  --surface2: #263148;
  --border: #334155;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --radius: 14px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
}

[data-theme="light"] {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface2: #f1f5f9;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
}

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

body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* HEADER */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  gap: 12px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
}

.logo-img { width: 38px; height: 38px; border-radius: 8px; }

.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-main { font-weight: 800; font-size: 16px; color: var(--primary); }
.brand-sub { font-size: 12px; color: var(--muted); }

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

.theme-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  transition: all 0.2s;
}
.theme-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

.wa-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: #25d366;
  color: #fff;
  padding: 8px 16px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: opacity 0.2s;
}
.wa-btn:hover { opacity: 0.85; }

/* HERO */
.hero {
  background: linear-gradient(135deg, var(--primary-dark) 0%, #7c3aed 100%);
  padding: 48px 24px 40px;
  text-align: center;
}

.hero-inner { max-width: 600px; margin: 0 auto; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.15);
  color: #fff;
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
  backdrop-filter: blur(10px);
}

.hero h1 {
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
}

.hero p {
  color: rgba(255,255,255,0.85);
  font-size: 16px;
}

/* APP WRAP */
.app-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

/* TYPE SELECTOR */
.type-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
  justify-content: center;
}

.type-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 100px;
  border: 2px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

.type-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
}

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

/* APP GRID */
.app-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

@media (max-width: 800px) {
  .app-grid { grid-template-columns: 1fr; }
}

/* INPUT PANEL */
.input-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.qr-form { display: none; }
.qr-form.active { display: block; }

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.form-group label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.hint { font-weight: 400; color: var(--muted); font-size: 12px; }

.form-group input,
.form-group textarea,
.form-group select {
  background: var(--surface);
  border: 1.5px solid var(--border);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.2s;
  outline: none;
  width: 100%;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--primary);
}

/* SETTINGS CARD */
.settings-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.settings-card h3 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.color-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.color-label { font-size: 12px; color: var(--muted); }

input[type="color"] {
  width: 36px !important;
  height: 36px !important;
  padding: 2px !important;
  border-radius: 8px !important;
  cursor: pointer;
}

/* GENERATE BUTTON */
.generate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary), #7c3aed);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  font-family: inherit;
}

.generate-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.generate-btn:active { transform: scale(0.98); }

/* PREVIEW PANEL */
.preview-panel { display: flex; flex-direction: column; gap: 20px; }

.preview-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  box-shadow: var(--shadow);
}

.preview-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.qr-output {
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.qr-output canvas,
.qr-output img {
  border-radius: 10px;
  max-width: 100%;
}

.qr-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.qr-placeholder i { font-size: 64px; opacity: 0.3; }
.qr-placeholder p { font-size: 14px; line-height: 1.5; }

/* QR ACTIONS */
.qr-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 4px;
}

.action-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  border: none;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

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

.btn-copy { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-copy:hover { border-color: var(--primary); color: var(--primary); }

.btn-share { background: #25d366; color: #fff; }
.btn-share:hover { opacity: 0.85; }

.qr-meta {
  margin-top: 12px;
  font-size: 12px;
  color: var(--muted);
  word-break: break-all;
  background: var(--surface2);
  padding: 8px 12px;
  border-radius: 8px;
  text-align: left;
}

/* USE CASES */
.use-cases {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.use-cases h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 14px;
}

.use-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.use-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 8px;
  background: var(--surface2);
  border-radius: 10px;
  font-size: 12px;
  color: var(--muted);
  text-align: center;
}

.use-item i { font-size: 20px; color: var(--primary); }

/* FOOTER */
.app-footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.app-footer a { color: var(--primary); text-decoration: none; }
.app-footer a:hover { text-decoration: underline; }

/* TOAST */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease;
  z-index: 9999;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show { transform: translateX(-50%) translateY(0); }
.toast.success { border-color: var(--green); color: var(--green); }
.toast.error { border-color: #ef4444; color: #ef4444; }

@media (max-width: 500px) {
  .settings-grid { grid-template-columns: 1fr; }
  .use-grid { grid-template-columns: repeat(2, 1fr); }
  .type-btn { font-size: 13px; padding: 8px 14px; }
}


/* ---- HOME BUTTON ---- */
.home-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 7px;
  color: rgba(255,255,255,0.65);
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s;
  white-space: nowrap;
}
.home-btn:hover { border-color: rgba(255,255,255,0.55); color: #fff; }