/* ============================================================
   PDF to Word Converter — Mobile-First Responsive Styles
   Freecvt.com
   ============================================================ */

/* --- CSS Variables / Theming --- */
:root {
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #eef2ff;
  --color-primary-glow: rgba(79, 70, 229, 0.15);
  --color-success: #10b981;
  --color-success-bg: #ecfdf5;
  --color-error: #ef4444;
  --color-error-bg: #fef2f2;
  --color-warning: #f59e0b;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;
  --color-dashed: #94a3b8;
  --font-stack: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.1);
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
}

/* Screen-reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- Header --- */
.header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 1.1rem;
}

.logo:hover {
  opacity: 0.85;
}

.logo svg {
  flex-shrink: 0;
}

nav {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  padding: 0.35rem 0.7rem;
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.nav-link.active {
  background: var(--color-primary);
  color: #fff;
}

/* --- Main Content --- */
main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.converter-section {
  width: 100%;
  max-width: 560px;
  padding: 2rem 1.25rem 3rem;
}

.page-title {
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}

.page-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
  line-height: 1.5;
}

/* --- Upload Zone --- */
.upload-zone {
  border: 2px dashed var(--color-dashed);
  border-radius: var(--radius-lg);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  background: var(--color-surface);
  position: relative;
}

.upload-zone:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.upload-zone.drag-over {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  box-shadow: 0 0 0 4px var(--color-primary-glow);
}

.upload-zone:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.upload-icon {
  color: var(--color-primary);
  margin-bottom: 1rem;
  transition: transform var(--transition);
}

.upload-zone:hover .upload-icon {
  transform: translateY(-2px);
}

.upload-text {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.upload-hint {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* --- File Info --- */
.file-info {
  margin-top: 1rem;
}

.file-info-inner {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.file-icon {
  color: var(--color-primary);
  flex-shrink: 0;
}

.file-name {
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.file-size {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  flex-shrink: 0;
}

.remove-btn {
  background: none;
  border: none;
  font-size: 1.3rem;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0 0.25rem;
  line-height: 1;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  flex-shrink: 0;
}

.remove-btn:hover {
  color: var(--color-error);
  background: var(--color-error-bg);
}

/* --- Convert Button --- */
.convert-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  margin-top: 1.25rem;
  padding: 0.9rem 1.5rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition), transform 0.1s;
}

.convert-btn:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.convert-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.convert-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.convert-btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* --- Progress --- */
.progress-container {
  margin-top: 1.25rem;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--color-border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-primary), #818cf8);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.progress-text {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}

/* --- Result --- */
.result {
  margin-top: 1.5rem;
}

.result-success {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--color-success-bg);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-lg);
}

.success-icon {
  color: var(--color-success);
  margin-bottom: 0.75rem;
}

.result-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
  color: var(--color-success);
}

.result-detail {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  background: var(--color-success);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: background var(--transition), transform 0.1s;
}

.download-btn:hover {
  background: #059669;
  box-shadow: var(--shadow-md);
}

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

.download-btn:focus-visible {
  outline: 2px solid var(--color-success);
  outline-offset: 2px;
}

.convert-another-btn {
  display: block;
  margin: 1rem auto 0;
  padding: 0.5rem 1rem;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-family: var(--font-stack);
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

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

/* --- Error --- */
.error-msg {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-md);
  color: var(--color-error);
  font-size: 0.9rem;
  font-weight: 500;
}

.error-icon {
  flex-shrink: 0;
}

/* --- Features Section --- */
.features {
  width: 100%;
  max-width: 900px;
  padding: 2rem 1.25rem 3rem;
}

.features-title {
  text-align: center;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.feature-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
}

.feature-icon {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --- Footer --- */
.footer {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--color-border);
}

/* --- Animations --- */
@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.result-success {
  animation: fadeIn 0.3s ease;
}

.error-msg {
  animation: fadeIn 0.3s ease;
}

/* --- Tablet (≥600px) --- */
@media (min-width: 600px) {
  .converter-section {
    padding: 3rem 2rem 4rem;
  }

  .upload-zone {
    padding: 4rem 2rem;
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* --- Desktop (≥900px) --- */
@media (min-width: 900px) {
  .converter-section {
    max-width: 620px;
  }

  .header-inner {
    padding: 0.75rem 2rem;
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}