/* =============================================
   ConvertPro – Full Design System
   ============================================= */

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

:root {
  --bg-primary:   #0a0a14;
  --bg-secondary: #11111f;
  --bg-card:      rgba(255,255,255,0.04);
  --bg-card-hover:rgba(255,255,255,0.07);
  --accent:       #6c63ff;
  --accent-light: #a78bfa;
  --accent-glow:  rgba(108,99,255,0.35);
  --success:      #10b981;
  --warning:      #f59e0b;
  --danger:       #ef4444;
  --text-primary: #f1f0ff;
  --text-secondary:#a0a0c0;
  --text-muted:   #6060a0;
  --border:       rgba(255,255,255,0.08);
  --border-hover: rgba(108,99,255,0.5);
  --radius-sm:    8px;
  --radius-md:    14px;
  --radius-lg:    20px;
  --radius-xl:    28px;
  --shadow-glow:  0 0 40px rgba(108,99,255,0.2);
  --transition:   0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- SCROLLBAR ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }

/* ---------- UTILITIES ---------- */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.gradient-text {
  background: linear-gradient(135deg, #6c63ff, #a78bfa, #c4b5fd);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #6c63ff, #a78bfa);
  color: white;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 10px 22px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(108,99,255,0.4);
  letter-spacing: 0.01em;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(108,99,255,0.55);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.875rem;
  padding: 10px 20px;
  border-radius: 50px;
  border: 1px solid var(--border);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: rgba(108,99,255,0.07);
}

/* ---------- NAVBAR ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px 0;
  background: rgba(10, 10, 20, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}
.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-text {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.nav-links {
  display: flex;
  gap: 28px;
  flex: 1;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }
.nav-cta { margin-left: auto; }

/* ---------- HERO ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  animation: orbFloat 8s ease-in-out infinite;
}
.orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, #6c63ff, transparent);
  top: -150px; left: -100px;
  animation-delay: 0s;
}
.orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, #a78bfa, transparent);
  top: 50px; right: -100px;
  animation-delay: -3s;
}
.orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, #c4b5fd, transparent);
  bottom: 100px; left: 30%;
  animation-delay: -5s;
}
@keyframes orbFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(108,99,255,0.12);
  border: 1px solid rgba(108,99,255,0.3);
  color: var(--accent-light);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 24px;
  letter-spacing: 0.02em;
}
.badge-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent-light);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.9); }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: var(--text-primary);
}
.hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
}
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  margin-bottom: 56px;
}
.stat-item { text-align: center; }
.stat-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.stat-divider {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* ---------- UPLOAD ZONE ---------- */
.upload-wrapper {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 700px;
}
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}
.upload-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(108,99,255,0.05), rgba(167,139,250,0.03));
  opacity: 0;
  transition: opacity var(--transition);
}
.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(108,99,255,0.12), var(--shadow-glow);
  transform: translateY(-4px);
}
.upload-zone:hover::before,
.upload-zone.drag-over::before { opacity: 1; }
.upload-zone.drag-over {
  border-style: solid;
  background: rgba(108,99,255,0.08);
}
.upload-icon {
  margin-bottom: 16px;
  transition: transform var(--transition);
}
.upload-zone:hover .upload-icon { transform: translateY(-4px); }
.upload-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.upload-link {
  color: var(--accent-light);
  text-decoration: underline;
  cursor: pointer;
}
.upload-sub {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ---------- FILES SECTION ---------- */
.files-section {
  padding: 40px 0 80px;
}
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.section-title {
  font-size: 1.4rem;
  font-weight: 700;
}
.section-actions { display: flex; gap: 10px; }

/* ---------- FILE CARD ---------- */
.file-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all var(--transition);
  backdrop-filter: blur(8px);
  flex-wrap: wrap;
}
.file-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}
.file-icon {
  width: 44px; height: 44px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  flex-shrink: 0;
}
.file-icon.image { background: rgba(59,130,246,0.15); }
.file-icon.audio { background: rgba(16,185,129,0.15); }
.file-icon.video { background: rgba(245,158,11,0.15); }
.file-info { flex: 1; min-width: 0; }
.file-name {
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-primary);
}
.file-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}
.file-controls {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.format-select {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  font-size: 0.82rem;
  font-family: 'Inter', sans-serif;
  cursor: pointer;
  transition: border-color var(--transition);
  outline: none;
}
.format-select:hover,
.format-select:focus { border-color: var(--accent); }
.format-select option { background: #1a1a2e; }

.btn-convert {
  background: linear-gradient(135deg, #6c63ff, #a78bfa);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 18px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: 'Inter', sans-serif;
  white-space: nowrap;
}
.btn-convert:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(108,99,255,0.4);
}
.btn-convert:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-remove {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  font-size: 1rem;
  line-height: 1;
}
.btn-remove:hover { color: var(--danger); background: rgba(239,68,68,0.1); }

/* ---------- PROGRESS BAR ---------- */
.progress-container {
  width: 100%;
  margin-top: 12px;
}
.progress-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: flex;
  justify-content: space-between;
}
.progress-bar {
  height: 5px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #6c63ff, #a78bfa);
  border-radius: 3px;
  transition: width 0.3s ease;
  width: 0%;
  position: relative;
  overflow: hidden;
}
.progress-fill::after {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ---------- DOWNLOAD BUTTON ---------- */
.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16,185,129,0.15);
  color: var(--success);
  border: 1px solid rgba(16,185,129,0.3);
  border-radius: var(--radius-sm);
  padding: 8px 18px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  font-family: 'Inter', sans-serif;
  white-space: nowrap;
}
.btn-download:hover {
  background: rgba(16,185,129,0.25);
  transform: translateY(-1px);
}

/* ---------- STATUS BADGES ---------- */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 50px;
  font-size: 0.72rem;
  font-weight: 600;
}
.status-converting {
  background: rgba(108,99,255,0.15);
  color: var(--accent-light);
  border: 1px solid rgba(108,99,255,0.2);
}
.status-done {
  background: rgba(16,185,129,0.12);
  color: var(--success);
  border: 1px solid rgba(16,185,129,0.2);
}
.status-error {
  background: rgba(239,68,68,0.12);
  color: var(--danger);
  border: 1px solid rgba(239,68,68,0.2);
}

/* ---------- FEATURES SECTION ---------- */
.features-section, .formats-section, .how-section {
  padding: 100px 0;
}
.features-section { background: linear-gradient(180deg, transparent, rgba(108,99,255,0.04), transparent); }
.section-tag {
  display: inline-block;
  background: rgba(108,99,255,0.1);
  border: 1px solid rgba(108,99,255,0.2);
  color: var(--accent-light);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.section-heading {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: var(--text-primary);
}
.section-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 52px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-light));
  opacity: 0;
  transition: opacity var(--transition);
}
.feature-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(108,99,255,0.12);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  font-size: 2rem;
  margin-bottom: 14px;
  display: block;
}
.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ---------- FORMATS SECTION ---------- */
.formats-section { text-align: center; }
.formats-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 9px 22px;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: 'Inter', sans-serif;
}
.tab-btn:hover,
.tab-btn.active {
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(167,139,250,0.15));
  border-color: var(--accent);
  color: var(--text-primary);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.format-badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
.format-badge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 7px 18px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.05em;
  transition: all var(--transition);
}
.format-badge:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: rgba(108,99,255,0.07);
}

/* ---------- HOW IT WORKS ---------- */
.how-section { text-align: center; }
.steps-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.step-card {
  flex: 1;
  min-width: 220px;
  max-width: 280px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}
.step-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}
.step-number {
  font-size: 2.5rem;
  font-weight: 900;
  color: transparent;
  background: linear-gradient(135deg, #6c63ff, #a78bfa);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}
.step-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.step-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}
.step-arrow {
  font-size: 1.5rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ---------- FOOTER ---------- */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 48px 0 28px;
}
.footer-top { margin-bottom: 32px; }
.footer-brand .logo { margin-bottom: 12px; }
.footer-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  max-width: 360px;
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
}
.footer-bottom p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---------- TOAST ---------- */
.toast {
  position: fixed;
  bottom: 28px; right: 28px;
  background: #1e1e36;
  color: var(--text-primary);
  border: 1px solid rgba(108,99,255,0.3);
  padding: 14px 22px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  z-index: 9999;
  opacity: 0;
  transform: translateY(16px);
  transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
  pointer-events: none;
  max-width: 320px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.success { border-color: rgba(16,185,129,0.4); }
.toast.error { border-color: rgba(239,68,68,0.4); }

/* ---------- FFMPEG OVERLAY ---------- */
.ffmpeg-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(8px);
  z-index: 9998;
  display: flex; align-items: center; justify-content: center;
}
.ffmpeg-modal {
  background: #14142a;
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: var(--radius-xl);
  padding: 44px 48px;
  text-align: center;
  max-width: 400px;
  width: calc(100% - 48px);
  box-shadow: 0 24px 80px rgba(0,0,0,0.5), var(--shadow-glow);
}
.ffmpeg-spinner {
  width: 52px; height: 52px;
  border: 3px solid rgba(108,99,255,0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 20px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.ffmpeg-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.ffmpeg-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.ffmpeg-progress-bar {
  height: 6px;
  background: rgba(255,255,255,0.07);
  border-radius: 3px;
  overflow: hidden;
}
.ffmpeg-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #6c63ff, #a78bfa);
  border-radius: 3px;
  width: 0%;
  transition: width 0.4s ease;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero { padding: 100px 16px 60px; }
  .hero-stats { gap: 20px; }
  .upload-zone { padding: 36px 24px; }
  .file-card { flex-wrap: wrap; }
  .file-controls { width: 100%; }
  .step-arrow { display: none; }
  .steps-grid { flex-direction: column; align-items: center; }
  .features-grid { grid-template-columns: 1fr; }
  .section-header { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 2rem; }
  .hero-sub { font-size: 0.95rem; }
  .stat-num { font-size: 1.3rem; }
  .hero-stats { gap: 16px; }
}