/* ============================================================
   tools.partzion.com — Global Design System
   Vanilla CSS | Dark & Light Theme | TR/EN
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ─── CSS Variables: Dark Theme (default) ─── */
:root {
  /* Surfaces */
  --bg-primary:    #080d1a;
  --bg-secondary:  #0d1526;
  --bg-card:       rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --bg-input:      rgba(255,255,255,0.06);
  --bg-input-focus:rgba(59,130,246,0.10);

  /* Borders */
  --border-subtle: rgba(255,255,255,0.08);
  --border-card:   rgba(255,255,255,0.10);
  --border-focus:  #3b82f6;

  /* Brand / Accent */
  --accent:        #3b82f6;
  --accent-glow:   rgba(59,130,246,0.30);
  --accent-2:      #06b6d4;
  --accent-grad:   linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  --danger:        #ef4444;
  --danger-glow:   rgba(239,68,68,0.28);
  --success:       #22c55e;
  --warning:       #f59e0b;

  /* Text */
  --text-primary:  #f0f4ff;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;
  --text-accent:   #60a5fa;

  /* SVG / Canvas */
  --canvas-bg:     #0b1120;
  --canvas-border: rgba(59,130,246,0.25);
  --part-fill:     rgba(59,130,246,0.20);
  --part-stroke:   #60a5fa;
  --frame-bind:    rgba(255,255,255,0.05);
  --frame-proc:    #3b82f6;

  /* Misc */
  --shadow-card:   0 4px 24px rgba(0,0,0,0.40);
  --shadow-glow:   0 0 20px rgba(59,130,246,0.18);
  --radius-card:   16px;
  --radius-input:  10px;
  --radius-btn:    10px;
  --transition:    0.22s ease;
}

/* ─── Light Theme Override ─── */
[data-theme="light"] {
  --bg-primary:    #f0f4ff;
  --bg-secondary:  #e8eef9;
  --bg-card:       rgba(255,255,255,0.90);
  --bg-card-hover: rgba(255,255,255,1);
  --bg-input:      rgba(255,255,255,0.95);
  --bg-input-focus:rgba(59,130,246,0.07);

  --border-subtle: rgba(0,0,0,0.07);
  --border-card:   rgba(0,0,0,0.10);
  --border-focus:  #3b82f6;

  --accent-glow:   rgba(59,130,246,0.18);

  --text-primary:  #0f172a;
  --text-secondary:#334155;
  --text-muted:    #64748b;
  --text-accent:   #1d4ed8;

  --canvas-bg:     #f8faff;
  --canvas-border: rgba(59,130,246,0.20);
  --part-fill:     rgba(59,130,246,0.12);
  --part-stroke:   #2563eb;
  --frame-bind:    #e2e8f0;
  --frame-proc:    #3b82f6;

  --shadow-card:   0 4px 24px rgba(59,130,246,0.10);
  --shadow-glow:   0 0 20px rgba(59,130,246,0.10);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  font-size: 15px;
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

/* ─── Header / Navbar ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(8,13,26,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  transition: background var(--transition);
}

[data-theme="light"] .site-header {
  background: rgba(240,244,255,0.88);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-grad);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
  box-shadow: var(--shadow-glow);
}

.logo-text {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.logo-text span {
  color: var(--accent);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Theme toggle */
.btn-toggle {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-card);
  background: var(--bg-card);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  transition: background var(--transition), border-color var(--transition), transform 0.15s;
  color: var(--text-secondary);
}

.btn-toggle:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: scale(1.08);
}

/* Language toggle */
.lang-toggle {
  display: flex;
  border: 1px solid var(--border-card);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg-card);
}

.lang-btn {
  padding: 5px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  background: transparent;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
  letter-spacing: 0.03em;
}

.lang-btn.active {
  background: var(--accent);
  color: #fff;
}

/* ─── Page Content Wrapper ─── */
.page-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

/* ─── Page Title / Hero ─── */
.page-hero {
  text-align: center;
  padding: 48px 20px 40px;
}

.page-hero h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  background: var(--accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.page-hero p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 520px;
  margin: 0 auto;
}

/* ─── Tool Grid (Homepage) ─── */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 32px;
}

.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-card);
  padding: 24px;
  cursor: pointer;
  text-decoration: none;
  display: block;
  position: relative;
  overflow: hidden;
  transition: background var(--transition), border-color var(--transition), 
              transform 0.18s, box-shadow 0.18s;
  box-shadow: var(--shadow-card);
}

.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-grad);
  opacity: 0;
  transition: opacity 0.22s;
  border-radius: inherit;
}

.tool-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.tool-card:hover::before {
  opacity: 0.04;
}

.tool-card-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(59,130,246,0.20) 0%, rgba(6,182,212,0.20) 100%);
  border: 1px solid rgba(59,130,246,0.25);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 14px;
  transition: transform 0.18s;
}

.tool-card:hover .tool-card-icon {
  transform: scale(1.10);
}

.tool-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.tool-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.tool-card-badge {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.73rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.badge-ready {
  background: rgba(34,197,94,0.15);
  color: #4ade80;
  border: 1px solid rgba(34,197,94,0.25);
}

.badge-soon {
  background: rgba(245,158,11,0.12);
  color: #fbbf24;
  border: 1px solid rgba(245,158,11,0.20);
}

/* ─── Section Title ─── */
.section-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-subtle);
}

/* ─── Tool Page Layout ─── */
.tool-layout {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 20px;
  align-items: start;
}

@media (max-width: 900px) {
  .tool-layout { grid-template-columns: 1fr; }
}

/* ─── Panel / Card ─── */
.panel {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-card);
}

.panel-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ─── Form Sections (collapsible groups) ─── */
.form-section {
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 12px;
  background: rgba(255,255,255,0.02);
  transition: border-color var(--transition);
}

[data-theme="light"] .form-section {
  background: rgba(0,0,0,0.02);
}

.form-section:focus-within {
  border-color: rgba(59,130,246,0.30);
}

.form-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* ─── Grid helpers ─── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }

/* ─── Form Controls ─── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

label, .form-label {
  font-size: 0.80rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

input[type="number"],
input[type="text"],
select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-input);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 500;
  padding: 7px 11px;
  width: 100%;
  transition: border-color var(--transition), background var(--transition), 
              box-shadow var(--transition);
  outline: none;
}

input[type="number"]:focus,
input[type="text"]:focus,
select:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input:disabled, select:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

input.readonly-styled {
  background: rgba(255,255,255,0.03);
  color: var(--text-muted);
  border-style: dashed;
  cursor: default;
}

[data-theme="light"] input.readonly-styled {
  background: rgba(0,0,0,0.03);
}

/* Select arrow */
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 32px;
}

/* ─── Radio / Checkbox ─── */
.radio-group, .check-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.radio-label, .check-label {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 0.86rem;
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: 500;
}

input[type="radio"],
input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-card);
  background: var(--bg-input);
  transition: all var(--transition);
  cursor: pointer;
  flex-shrink: 0;
}

input[type="radio"] { border-radius: 50%; }
input[type="checkbox"] { border-radius: 4px; }

input[type="radio"]:checked {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="checkbox"]:checked {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

input[type="radio"]:checked::after {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #fff;
  margin: 3px auto;
}

input[type="checkbox"]:checked::after {
  content: '✓';
  display: block;
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  text-align: center;
  line-height: 13px;
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border: none;
  border-radius: var(--radius-btn);
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  padding: 9px 20px;
  transition: transform 0.15s, box-shadow 0.18s, opacity 0.15s;
  outline: none;
  letter-spacing: 0.01em;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 4px 14px rgba(59,130,246,0.35);
  width: 100%;
}

.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(59,130,246,0.50);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
}

.btn-secondary:hover {
  border-color: var(--border-focus);
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.btn-danger-outline {
  background: transparent;
  border: 1.5px solid var(--danger);
  color: var(--danger);
  width: 100%;
}

.btn-danger-outline:hover {
  background: rgba(239,68,68,0.10);
  box-shadow: 0 0 14px var(--danger-glow);
}

/* ─── Metric Cards (Results) ─── */
.metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 12px 14px;
  transition: border-color var(--transition);
}

.metric-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.metric-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-accent);
  letter-spacing: -0.01em;
}

.metric-value.danger {
  color: var(--danger);
  text-shadow: 0 0 12px var(--danger-glow);
}

/* ─── Canvas / SVG Panel ─── */
.canvas-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-card);
  padding: 20px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.canvas-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.canvas-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.canvas-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.73rem;
  color: var(--text-muted);
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0.5;
}

.svg-box {
  width: 100%;
  border-radius: 12px;
  background: var(--canvas-bg);
  border: 1px solid var(--canvas-border);
  display: block;
  min-height: 300px;
  transition: background var(--transition);
}

/* ─── Alert / Warning Banner ─── */
.alert-danger {
  background: rgba(239,68,68,0.10);
  border: 1px solid rgba(239,68,68,0.30);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.86rem;
  color: #fca5a5;
  margin-top: 10px;
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.alert-danger strong { color: #f87171; }

/* ─── Breadcrumb ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.80rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.breadcrumb a:hover { color: var(--text-accent); }
.breadcrumb-sep { opacity: 0.4; }
.breadcrumb-current { color: var(--text-secondary); font-weight: 500; }

/* ─── Footer ─── */
.site-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.78rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-subtle);
  margin-top: 40px;
}

.site-footer a {
  color: var(--text-accent);
  text-decoration: none;
}

/* ─── Utility ─── */
.hidden { display: none !important; }
.mt-1 { margin-top: 6px; }
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 18px; }
.mb-1 { margin-bottom: 6px; }
.mb-2 { margin-bottom: 12px; }
.w-full { width: 100%; }
.text-muted { color: var(--text-muted); font-size: 0.80rem; }
.text-center { text-align: center; }
.flex { display: flex; }
.items-center { align-items: center; }
.gap-2 { gap: 8px; }

/* ─── Animations ─── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 4px 14px rgba(59,130,246,0.35); }
  50%       { box-shadow: 0 4px 24px rgba(59,130,246,0.65); }
}

.animate-in { animation: fadeInUp 0.40s ease both; }
.animate-in-delay { animation: fadeInUp 0.40s ease 0.15s both; }

/* ─── Scrollbar ─── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-card); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-focus); }

/* ─── Media Queries ─── */
@media (max-width: 1100px) {
  .tool-layout { grid-template-columns: 360px 1fr; }
}

@media (max-width: 900px) {
  .tool-layout { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .page-content { padding: 16px 12px 40px; }
  .panel { padding: 14px; }
  .grid-2 { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
  .site-header { padding: 0 14px; }
}