/* ============================================================
   VAToolkit — Shared Design System
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;600;700&family=DM+Sans:wght@400;500&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --bg:           #0F0F0F;
  --surface:      #1A1A1A;
  --surface-el:   #242424;
  --accent:       #7C6FF7;
  --accent-hover: #9389F9;
  --teal:         #4ECDC4;
  --text-primary: #F5F5F5;
  --text-sec:     #888888;
  --border:       #2E2E2E;
  --radius-card:  12px;
  --radius-btn:   8px;
  --shadow:       0 4px 24px rgba(0,0,0,0.4);
  --transition:   0.2s ease;
}

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

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: 'DM Sans', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, h4, h5 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--accent-hover); }

/* ---------- Layout Helpers ---------- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Shared Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,15,15,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.logo span { color: var(--accent); }

.site-header nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-header nav a {
  color: var(--text-sec);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--transition);
}
.site-header nav a:hover { color: var(--text-primary); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-btn);
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: background var(--transition), opacity var(--transition), transform var(--transition);
}
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--surface-el);
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: #2e2e2e; }

.btn-outline {
  background: transparent;
  color: var(--text-sec);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

.btn-ghost {
  background: transparent;
  color: var(--text-sec);
  border: none;
  padding: 8px 12px;
  font-size: 0.9rem;
}
.btn-ghost:hover { color: var(--text-primary); }

.settings-btn {
  background: var(--surface-el);
  color: var(--text-sec);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  padding: 7px 14px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}
.settings-btn:hover { border-color: var(--accent); color: var(--text-primary); }

/* ---------- Form Controls ---------- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-sec);
  letter-spacing: 0.02em;
}

input[type="text"],
input[type="password"],
input[type="email"],
textarea,
select {
  background: var(--surface-el);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-btn);
  padding: 10px 14px;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  width: 100%;
  transition: border-color var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}

input::placeholder, textarea::placeholder { color: var(--text-sec); }

input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
}

textarea { resize: vertical; min-height: 80px; }

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='%23888' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
  cursor: pointer;
}

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px;
  box-shadow: var(--shadow);
}

/* ---------- Result Card ---------- */
.result-card {
  background: var(--surface-el);
  border-radius: var(--radius-card);
  padding: 20px;
  border-left: 3px solid var(--accent);
  white-space: pre-wrap;
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--text-primary);
  word-break: break-word;
}

/* ---------- Skeleton Loader ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--surface-el) 25%, #2e2e2e 50%, var(--surface-el) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 6px;
  height: 16px;
  margin-bottom: 10px;
}
.skeleton.wide { width: 100%; }
.skeleton.medium { width: 75%; }
.skeleton.short { width: 45%; }

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---------- Badge ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: rgba(124,111,247,0.15);
  color: var(--accent);
  border: 1px solid rgba(124,111,247,0.3);
  border-radius: 20px;
  padding: 3px 10px;
  font-size: 0.8rem;
  font-weight: 500;
}

.badge-teal {
  background: rgba(78,205,196,0.15);
  color: var(--teal);
  border-color: rgba(78,205,196,0.3);
}

/* ---------- Settings Modal ---------- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 999;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.modal-overlay.active { display: flex; }

.modal-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 32px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow);
}

.modal-box h3 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.modal-hint {
  font-size: 0.8rem;
  color: var(--text-sec);
  margin-top: 6px;
  line-height: 1.5;
}

.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  justify-content: flex-end;
}

/* ---------- Usage Counter ---------- */
.usage-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-sec);
  margin-bottom: 20px;
}

.usage-dots {
  display: flex;
  gap: 4px;
}

.usage-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: background var(--transition);
}
.usage-dot.used { background: var(--accent); }

/* ---------- Error Message ---------- */
.error-msg {
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: var(--radius-btn);
  color: #f87171;
  padding: 12px 16px;
  font-size: 0.9rem;
}

/* ---------- Tool Page Layout ---------- */
.tool-page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.tool-header {
  margin-bottom: 32px;
}

.tool-header h1 {
  font-size: 1.8rem;
  margin-bottom: 6px;
}

.tool-header p {
  color: var(--text-sec);
  font-size: 1rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: start;
}

.form-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px;
}

.output-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.output-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

.output-label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-sec);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.output-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.output-empty {
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-card);
  padding: 48px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: center;
  color: var(--text-sec);
  min-height: 240px;
}

.output-empty .empty-icon { font-size: 2.5rem; opacity: 0.5; }
.output-empty p { font-size: 0.9rem; }

/* ---------- Copy Feedback ---------- */
.copy-feedback {
  color: var(--teal) !important;
}

/* ---------- PDF Export Button ---------- */
.btn-pdf {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius-btn);
  padding: 10px 20px;
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background var(--transition), color var(--transition);
}
.btn-pdf:hover:not(:disabled) {
  background: var(--accent);
  color: #fff;
}
.btn-pdf:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
  text-align: center;
  color: var(--text-sec);
  font-size: 0.9rem;
  margin-top: auto;
}

.site-footer a {
  color: var(--text-sec);
}

.site-footer span {
  color: var(--accent);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .site-header .nav-links {
    display: none;
  }

  .tool-page {
    padding: 24px 16px 60px;
  }

  .tool-header h1 { font-size: 1.5rem; }

  .modal-box { padding: 24px; }
}