/* ============================================================
   tux-talk Design System — base.css
   Clean SaaS (Option B) — Purple accent, light background
   ============================================================ */

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f4f6fb;
  color: #1a1a2e;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Tokens ── */
:root {
  --primary:       #6c47ff;
  --primary-light: #a855f7;
  --primary-grad:  linear-gradient(135deg, #6c47ff, #a855f7);
  --primary-bg:    #f0edff;
  --primary-border:#c4b5fd;

  --text-dark:  #1a1a2e;
  --text-body:  #444;
  --text-muted: #888;
  --text-faint: #aaa;

  --bg-page:  #f4f6fb;
  --bg-card:  #ffffff;
  --bg-input: #f6f7fb;
  --border:   #e8ecf3;

  --success:        #16a34a;
  --success-bg:     #dcfce7;
  --warning:        #ca8a04;
  --warning-bg:     #fef9c3;
  --danger:         #dc2626;
  --danger-bg:      #fee2e2;

  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   14px;
  --radius-xl:   16px;
  --radius-full: 9999px;

  --shadow-1: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-2: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-3: 0 6px 20px rgba(108,71,255,0.12);
  --shadow-4: 0 12px 40px rgba(0,0,0,0.14);
}

/* ── Typography ── */
h1 { font-size: 28px; font-weight: 800; letter-spacing: -0.7px; line-height: 1.2; }
h2 { font-size: 20px; font-weight: 700; letter-spacing: -0.4px; }
h3 { font-size: 16px; font-weight: 700; }
h4 { font-size: 13px; font-weight: 700; }
p  { font-size: 14px; line-height: 1.6; color: var(--text-body); }
small { font-size: 11px; color: var(--text-muted); }
a  { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-faint);
}

/* ── Navigation ── */
.app-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  height: 60px;
  background: var(--bg-card);
  border-bottom: 1.5px solid var(--border);
  box-shadow: var(--shadow-1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--text-dark);
  letter-spacing: -0.5px;
  text-decoration: none;
}
.app-logo:hover { text-decoration: none; }

.logo-mark {
  width: 34px;
  height: 34px;
  background: var(--primary-grad);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(108,71,255,0.35);
  flex-shrink: 0;
}

.nav-pills {
  display: flex;
  gap: 4px;
}
.nav-pill {
  padding: 7px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s;
}
.nav-pill:hover { background: var(--bg-input); color: var(--text-dark); text-decoration: none; }
.nav-pill.active { background: var(--primary-bg); color: var(--primary); font-weight: 600; }

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-search {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 7px 14px;
  font-size: 12px;
  color: var(--text-faint);
  cursor: text;
}

.avatar {
  width: 32px;
  height: 32px;
  background: var(--primary-grad);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: #fff;
  font-weight: 700;
  flex-shrink: 0;
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-faint);
}
.breadcrumb a { color: var(--text-faint); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .sep { color: var(--border); }
.breadcrumb .current { color: var(--text-dark); font-weight: 600; }

/* ── Page wrapper ── */
.page-body {
  flex: 1;
  padding: 28px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-2);
}
.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.card-body { padding: 20px; }
.card-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  background: #fafbff;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.15s;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--primary-grad);
  color: #fff;
  box-shadow: 0 4px 12px rgba(108,71,255,0.3);
}
.btn-primary:hover { opacity: 0.9; box-shadow: 0 6px 18px rgba(108,71,255,0.4); }

.btn-outline {
  background: var(--primary-bg);
  color: var(--primary);
  border: 1.5px solid var(--primary-border);
}
.btn-outline:hover { background: #e8e2ff; }

.btn-ghost {
  background: var(--bg-input);
  color: var(--text-body);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover { border-color: #c4b5fd; color: var(--primary); }

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1.5px solid #fca5a5;
}
.btn-danger:hover { background: #fecaca; }

.btn-lg { padding: 13px 28px; font-size: 15px; border-radius: var(--radius-lg); }
.btn-sm { padding: 6px 12px; font-size: 11px; border-radius: 8px; }
.btn-icon { padding: 8px; width: 34px; height: 34px; }
.btn-block { width: 100%; }

/* ── Badges ── */
.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge-purple { background: var(--primary-bg); color: var(--primary); }
.badge-green  { background: var(--success-bg); color: var(--success); }
.badge-yellow { background: var(--warning-bg); color: var(--warning); }
.badge-red    { background: var(--danger-bg);  color: var(--danger);  }
.badge-gray   { background: var(--bg-input);   color: var(--text-muted); }

/* ── Form elements ── */
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}
.form-control {
  width: 100%;
  padding: 9px 13px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--text-dark);
  outline: none;
  transition: border-color 0.15s;
  font-family: inherit;
}
.form-control:focus { border-color: var(--primary); background: #fff; }
.form-control::placeholder { color: var(--text-faint); }
select.form-control { cursor: pointer; }

/* ── Range slider ── */
.range-wrapper { display: flex; align-items: center; gap: 10px; }
input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  border-radius: 2px;
  background: var(--border);
  outline: none;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--primary);
  border: 2px solid #fff;
  box-shadow: 0 1px 4px rgba(108,71,255,0.4);
}
.range-value {
  width: 38px;
  text-align: right;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

/* ── Upload zone ── */
.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  background: var(--bg-input);
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  min-height: 160px;
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--primary);
  background: var(--primary-bg);
}
.upload-zone .upload-icon { font-size: 36px; margin-bottom: 12px; }
.upload-zone .upload-title { font-size: 14px; font-weight: 600; color: var(--text-dark); margin-bottom: 4px; }
.upload-zone .upload-sub   { font-size: 12px; color: var(--text-muted); }
.upload-zone input[type="file"] { display: none; }

/* ── Steps indicator ── */
.steps {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: var(--bg-card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 28px;
  margin-bottom: 24px;
}
.step { display: flex; align-items: center; gap: 8px; }
.step-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700;
  flex-shrink: 0;
}
.step-label { font-size: 13px; font-weight: 600; }
.step.done .step-num  { background: var(--success-bg); color: var(--success); }
.step.done .step-label { color: var(--success); }
.step.active .step-num  { background: var(--primary-grad); color: #fff; }
.step.active .step-label { color: var(--primary); }
.step.pending .step-num  { background: var(--bg-input); color: var(--text-faint); }
.step.pending .step-label { color: var(--text-faint); }
.step-line { width: 48px; height: 2px; background: var(--border); margin: 0 8px; flex-shrink: 0; }
.step-line.done { background: var(--success); }

/* ── Alert / notice ── */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 16px;
}
.alert-info    { background: var(--primary-bg); color: var(--primary); border: 1px solid var(--primary-border); }
.alert-success { background: var(--success-bg); color: var(--success); border: 1px solid #86efac; }
.alert-warning { background: var(--warning-bg); color: var(--warning); border: 1px solid #fde047; }
.alert-danger  { background: var(--danger-bg);  color: var(--danger);  border: 1px solid #fca5a5; }

/* ── Two-column split ── */
.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.split-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.split-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ── Preview pane ── */
.preview-pane {
  background: #f8f9fc;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.preview-pane-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.preview-pane-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  min-height: 200px;
}
.preview-pane img { max-width: 100%; max-height: 400px; object-fit: contain; border-radius: 8px; }

/* Checkerboard for transparent images */
.checkerboard {
  background-image:
    linear-gradient(45deg, #ccc 25%, transparent 25%),
    linear-gradient(-45deg, #ccc 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #ccc 75%),
    linear-gradient(-45deg, transparent 75%, #ccc 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

/* ── Loading spinner ── */
.spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--primary-bg);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px;
  text-align: center;
}
.loading-overlay.active { display: flex; }

/* ── Table ── */
.tbl { width: 100%; border-collapse: collapse; font-size: 12px; }
.tbl th {
  padding: 10px 14px;
  background: #f8f9fc;
  border-bottom: 1.5px solid var(--border);
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  color: var(--text-body);
  white-space: nowrap;
}
.tbl td {
  padding: 9px 14px;
  border-bottom: 1px solid #f0f2f7;
  color: var(--text-body);
}
.tbl tr:last-child td { border-bottom: none; }
.tbl tr:hover td { background: #fafbff; }

/* ── Footer ── */
.app-footer {
  padding: 18px 28px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
  background: var(--bg-card);
  margin-top: auto;
}

/* ── Utility ── */
.mt-0{margin-top:0} .mt-1{margin-top:8px} .mt-2{margin-top:16px} .mt-3{margin-top:24px}
.mb-0{margin-bottom:0} .mb-1{margin-bottom:8px} .mb-2{margin-bottom:16px} .mb-3{margin-bottom:24px}
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-gap-1 { gap: 8px; }
.flex-gap-2 { gap: 16px; }
.text-center { text-align: center; }
.text-right  { text-align: right; }
.text-muted  { color: var(--text-muted); }
.text-primary{ color: var(--primary); }
.text-success{ color: var(--success); }
.text-danger { color: var(--danger); }
.w-full { width: 100%; }
.hidden { display: none !important; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .app-nav { padding: 0 16px; }
  .page-body { padding: 16px; }
  .split-2, .split-3, .split-4 { grid-template-columns: 1fr; }
  .nav-pills { display: none; }
}