:root {
  --primary:#10b981;
  --primary-dark:#059669;
  --primary-darker:#047857;
  --secondary:#0d9488;
  --accent:#3b82f6;
  --accent-2:#6366f1;
  --light-accent:#d1fae5;
  --success:#10b981;
  --warning:#f59e0b;
  --danger:#ef4444;
  --info:#3b82f6;
  --dark:#0f172a;
  --gray:#64748b;
  --light:#f0fdf4;
  --border:#d1d5db;
  --bg-card:#ffffff;
  --text-primary:#1e293b;
  --text-secondary:#475569;
  --text-muted:#94a3b8;
  --shadow:0 4px 24px rgba(0,0,0,0.08);
  --primary-light:rgba(0,0,0,0.06);
  --bg-gradient:linear-gradient(160deg,#ecfdf5 0%,#f0fdf4 40%,#f0f4ff 100%);
}

* {
  margin:0;
  padding:0;
  box-sizing:border-box;
}

body {
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--bg-gradient);
  color:var(--text-primary);
  line-height:1.75;
  overflow-x:hidden;
  scroll-behavior:smooth;
}

h1,h2,h3,h4,h5,h6 {
  font-weight:700;
  line-height:1.3;
}

.container {
  max-width:1200px;
  margin:0 auto;
  padding:0 20px;
}

.hero-section {
  padding:120px 0 80px;
  background:linear-gradient(135deg,#059669 0%,#0d9488 50%,#2563eb 100%);
  color:#fff;
  position:relative;
  overflow:hidden;
}

.hero-section::after {
  content:'';
  position:absolute;
  bottom:-2px;
  left:0;
  right:0;
  height:60px;
  background:var(--bg-gradient);
  clip-path:ellipse(55% 100% at 50% 100%);
}

.hero-section::before {
  content:'';
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:radial-gradient(circle at 20% 30%,rgba(167,243,208,0.2) 0%,transparent 50%),radial-gradient(circle at 80% 70%,rgba(96,165,250,0.15) 0%,transparent 50%);
  pointer-events:none;
}

.hero-title {
  font-size:clamp(1.8rem,4vw,3rem);
  font-weight:900;
  margin-bottom:1rem;
  position:relative;
  z-index:1;
  line-height:1.2;
}

.hero-desc {
  font-size:1.05rem;
  opacity:.92;
  max-width:620px;
  position:relative;
  z-index:1;
}

.hero-stats {
  display:flex;
  gap:36px;
  margin-top:1.5rem;
  position:relative;
  z-index:1;
}

.hero-stat {
  text-align:center;
}

.hero-stat-num {
  font-size:1.8rem;
  font-weight:900;
  color:#fff;
}

.hero-stat-label {
  font-size:.8rem;
  opacity:.7;
  margin-top:2px;
}

.breadcrumb {
  font-size:.85rem;
  margin-bottom:14px;
  opacity:.85;
  position:relative;
  z-index:1;
}

.breadcrumb a {
  color:rgba(255,255,255,.8);
  text-decoration:none;
}

.tool-wrapper {
  margin-top:-30px;
  position:relative;
  z-index:10;
  padding-bottom:2rem;
}

.tool-card {
  background:var(--bg-card);
  border-radius:20px;
  overflow:hidden;
  box-shadow:0 4px 24px rgba(16,185,129,0.08);
  border:1px solid rgba(16,185,129,0.06);
}

.editor-section {
  padding:1.75rem;
}

.steps-bar {
  display:flex;
  justify-content:center;
  align-items:center;
  gap:10px;
  padding:1.25rem;
  background:var(--light);
  border-bottom:1px solid var(--border);
}

.step-item {
  display:flex;
  align-items:center;
  gap:8px;
  padding:.6rem 1.2rem;
  border-radius:30px;
  font-weight:600;
  font-size:.9rem;
  color:var(--gray);
  transition:all .25s;
}

.step-item.active {
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;
  box-shadow:0 4px 15px rgba(16,185,129,0.3);
}

.step-num-circle {
  width:30px;
  height:30px;
  border-radius:50%;
  background:currentColor;
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:700;
  font-size:.8rem;
}

.step-divider {
  width:36px;
  height:2px;
  background:var(--border);
}

.upload-zone {
  border:2.5px dashed rgba(16,185,129,0.3);
  border-radius:16px;
  padding:2.5rem 1.5rem;
  text-align:center;
  cursor:pointer;
  transition:all .3s;
  background:rgba(16,185,129,0.03);
}

.upload-zone:hover,.upload-zone.dragover {
  border-color:var(--primary);
  background:rgba(16,185,129,0.07);
  transform:scale(1.01);
}

.upload-zone .fa-cloud-upload-alt {
  font-size:3rem;
  color:var(--primary);
  margin-bottom:10px;
  display:block;
}

.upload-zone h3 {
  font-size:1.3rem;
  font-weight:700;
  color:var(--dark);
  margin-bottom:6px;
}

.upload-zone p {
  color:var(--gray);
  font-size:.92rem;
  max-width:480px;
  margin:0 auto 1.2rem;
  line-height:1.65;
}

.btn {
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 18px;
  border:none;
  border-radius:10px;
  font-size:.9rem;
  font-weight:600;
  cursor:pointer;
  transition:all .2s;
  font-family:inherit;
  justify-content:center;
  text-decoration:none;
}

.btn-primary {
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;
}

.btn-primary:hover:not(:disabled) {
  transform:translateY(-2px);
  box-shadow:0 6px 18px rgba(16,185,129,0.3);
}

.btn-primary:disabled {
  opacity:.5;
  cursor:not-allowed;
}

.btn-outline {
  background:transparent;
  color:var(--gray);
  border:2px solid var(--border);
  padding:8px 16px;
}

.btn-outline:hover {
  border-color:var(--primary);
  color:var(--primary);
  background:rgba(16,185,129,0.05);
}

.btn-danger {
  background:linear-gradient(135deg,#ef4444,#dc2626);
  color:#fff;
}

.btn-danger:hover {
  transform:translateY(-2px);
  box-shadow:0 6px 18px rgba(239,68,68,0.3);
}

.btn-sm {
  padding:7px 14px;
  font-size:.82rem;
}

.file-info-cards {
  display:none;
  gap:12px;
  margin-top:1.25rem;
}

.file-info-card {
  background:#f0fdf4;
  border:1px solid rgba(16,185,129,0.2);
  border-radius:12px;
  padding:.9rem 1.15rem;
  text-align:center;
  flex:1;
}

.file-info-card .ficon {
  font-size:1.2rem;
  color:var(--primary);
  margin-bottom:4px;
}

.file-info-card .fivalue {
  font-weight:700;
  font-size:.95rem;
}

.file-info-card .filabel {
  font-size:.78rem;
  color:var(--gray);
}

.mode-grid {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:12px;
  margin-top:1.25rem;
}

.mode-card {
  border:2px solid var(--border);
  border-radius:12px;
  padding:1rem .75rem;
  text-align:center;
  cursor:pointer;
  transition:all .25s;
  background:var(--bg-card);
}

.mode-card:hover {
  border-color:var(--primary);
  transform:translateY(-2px);
}

.mode-card.active {
  border-color:var(--primary);
  background:rgba(16,185,129,0.06);
  box-shadow:0 0 0 3px rgba(16,185,129,0.15);
}

.mode-card .micon {
  font-size:1.4rem;
  color:var(--primary);
  margin-bottom:6px;
  display:block;
}

.mode-card h5 {
  font-size:.92rem;
  font-weight:700;
  margin-bottom:2px;
}

.mode-card p {
  font-size:.78rem;
  color:var(--gray);
  margin:0;
}

.options-panel {
  display:none;
  margin-top:1.25rem;
  padding:1.25rem;
  background:var(--light);
  border-radius:12px;
  border:1px solid rgba(16,185,129,0.1);
}

.options-panel.show {
  display:block;
  animation:fadeIn .3s ease;
}

.options-panel h5 {
  font-size:.95rem;
  font-weight:700;
  margin-bottom:10px;
}

.equal-input-group {
  display:flex;
  align-items:center;
  gap:12px;
}

.equal-input-group input {
  width:70px;
  text-align:center;
  padding:.5rem;
  border:2px solid var(--border);
  border-radius:8px;
  font-size:1rem;
  font-weight:700;
}

.equal-input-group button {
  width:38px;
  height:38px;
  border-radius:50%;
  border:none;
  background:var(--primary);
  color:#fff;
  font-size:1.1rem;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:center;
}

.parts-manager {
  display:flex;
  flex-direction:column;
  gap:8px;
  margin-top:10px;
}

.part-row {
  display:flex;
  align-items:center;
  gap:8px;
  background:var(--bg-card);
  border-radius:8px;
  padding:.5rem .75rem;
  border:1px solid var(--border);
}

.part-row .plabel {
  font-size:.85rem;
  font-weight:600;
  min-width:55px;
}

.part-row input {
  width:65px;
  padding:.35rem;
  border:1px solid var(--border);
  border-radius:6px;
  text-align:center;
  font-size:.85rem;
}

.part-row .pdel {
  color:var(--danger);
  cursor:pointer;
  font-size:1rem;
}

.page-ranges-textarea {
  width:100%;
  min-height:120px;
  padding:.85rem;
  border:2px solid var(--border);
  border-radius:10px;
  font-family:monospace;
  font-size:.9rem;
  resize:vertical;
}

.output-options {
  display:flex;
  gap:16px;
  flex-wrap:wrap;
  margin-top:1rem;
  padding:.85rem 1rem;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:10px;
}

.output-options label {
  display:flex;
  align-items:center;
  gap:8px;
  font-size:.88rem;
  font-weight:500;
  cursor:pointer;
}

.preview-grid {
  display:none;
  grid-template-columns:repeat(auto-fill,minmax(180px,1fr));
  gap:12px;
  margin-top:1.25rem;
}

.preview-grid.show {
  display:grid;
}

.preview-part {
  background:var(--bg-card);
  border:2px solid var(--border);
  border-radius:10px;
  padding:1rem;
  text-align:center;
  transition:all .2s;
}

.preview-part:hover {
  border-color:var(--primary);
  transform:translateY(-2px);
}

.preview-part .pname {
  font-weight:700;
  font-size:.9rem;
  color:var(--primary);
}

.preview-part .ppages {
  font-size:.8rem;
  color:var(--gray);
  margin-top:4px;
}

.action-btns {
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:1.25rem;
}

.action-btns .btn {
  flex:1;
  min-width:120px;
}

.progress-container {
  display:none;
  margin-top:1.25rem;
  padding:1rem;
  background:#f0fdf4;
  border:1px solid rgba(16,185,129,0.2);
  border-radius:12px;
}

.progress-container.show {
  display:block;
}

.progress-bar {
  height:10px;
  background:var(--border);
  border-radius:5px;
  overflow:hidden;
}

.progress-fill {
  height:100%;
  background:linear-gradient(90deg,var(--primary),var(--accent));
  border-radius:5px;
  width:0%;
  transition:width .3s;
}

.progress-info {
  display:flex;
  justify-content:space-between;
  margin-top:6px;
  font-size:.8rem;
  color:var(--gray);
}

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

to {
  opacity:1;
  transform:translateY(0);
}

}
.content-section {
  padding:50px 0;
}

.content-card {
  background:var(--bg-card);
  border-radius:20px;
  padding:40px;
  margin-bottom:32px;
  box-shadow:0 4px 24px rgba(16,185,129,0.08);
  border:1px solid rgba(16,185,129,0.06);
}

.content-card h2 {
  font-size:1.4rem;
  margin-bottom:16px;
  color:var(--dark);
}

.content-card h3 {
  font-size:1.15rem;
  margin-bottom:12px;
  color:var(--text-primary);
}

.content-card p {
  color:var(--text-secondary);
  margin-bottom:14px;
  line-height:1.8;
}

.content-card ul {
  color:var(--text-secondary);
  margin-bottom:14px;
  padding-left:20px;
}

.content-card ul li {
  margin-bottom:6px;
}

.case-grid {
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:18px;
  margin-top:20px;
}

.case-card {
  background:var(--light);
  border-radius:14px;
  padding:22px;
  border:1px solid var(--border);
  transition:all .25s;
}

.case-card:hover {
  transform:translateY(-3px);
  box-shadow:0 8px 20px rgba(67,97,238,0.1);
  border-color:var(--primary);
}

.case-number {
  width:36px;
  height:36px;
  border-radius:10px;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  font-size:.95rem;
  margin-bottom:12px;
}

.case-card h3 {
  font-size:1rem;
  margin-bottom:8px;
  color:var(--text-primary);
}

.case-card .case-detail {
  font-size:.88rem;
  color:var(--text-secondary);
  margin-bottom:4px;
  line-height:1.6;
}

.usage-guide .step {
  display:flex;
  gap:18px;
  margin-bottom:24px;
  align-items:flex-start;
}

.usage-guide .step:last-child {
  margin-bottom:0;
}

.usage-guide .step-num {
  width:44px;
  height:44px;
  border-radius:12px;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  font-weight:800;
  font-size:1.1rem;
  flex-shrink:0;
}

.usage-guide .step-content h3 {
  font-size:1.05rem;
  margin-bottom:4px;
}

.usage-guide .step-content p {
  font-size:.92rem;
  color:var(--gray);
  margin:0;
  line-height:1.65;
}

.faq-section .faq-item {
  border:1px solid var(--border);
  border-radius:12px;
  margin-bottom:10px;
  overflow:hidden;
}

.faq-section .faq-q {
  width:100%;
  padding:1.1rem 1.3rem;
  font-weight:600;
  font-size:.95rem;
  background:var(--bg-card);
  border:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  cursor:pointer;
  transition:background .2s;
  font-family:inherit;
  text-align:left;
}

.faq-section .faq-q:hover {
  background:var(--light);
}

.faq-section .faq-q i {
  transition:transform .3s;
  color:var(--primary);
  flex-shrink:0;
}

.faq-section .faq-q.active i {
  transform:rotate(180deg);
}

.faq-section .faq-a {
  max-height:0;
  overflow:hidden;
  transition:max-height .35s ease;
}

.faq-section .faq-a.open {
  max-height:320px;
}

.faq-section .faq-a-inner {
  padding:0 1.3rem 1.15rem;
  color:var(--gray);
  font-size:.9rem;
  line-height:1.7;
}

.related-cards {
  display:grid;
  grid-template-columns:repeat(5,1fr);
  gap:18px;
  margin-top:24px;
}

@media(max-width:991px) {
  .related-cards {
    grid-template-columns:repeat(3,1fr);
  }
}

}
@media(max-width:575px) {
  .related-cards {
    grid-template-columns:repeat(2,1fr);
  }
}

}
.related-card {
  background:var(--bg-card);
  border:2px solid var(--border);
  border-radius:14px;
  padding:24px 18px;
  text-align:center;
  transition:all .3s;
  display:block;
  color:var(--dark);
  text-decoration:none;
  position:relative;
  overflow:hidden;
}

.related-card::before {
  content:'';
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:4px;
  background:linear-gradient(90deg,var(--primary),var(--secondary));
  transform:scaleX(0);
  transition:transform .4s ease;
  transform-origin:left;
}

.related-card:hover {
  border-color:var(--primary);
  transform:translateY(-6px);
  box-shadow:0 12px 28px rgba(16,185,129,0.15);
  color:var(--dark);
}

.related-card:hover::before {
  transform:scaleX(1);
}

.related-card-icon {
  width:52px;
  height:52px;
  border-radius:14px;
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;
  display:flex;
  align-items:center;
  justify-content:center;
  margin:0 auto 12px;
  font-size:1.3rem;
  transition:transform .3s;
}

.related-card:hover .related-card-icon {
  transform:rotate(10deg) scale(1.1);
}

.related-card-name {
  font-weight:700;
  font-size:.98rem;
  margin-bottom:4px;
}

.related-card-desc {
  font-size:.82rem;
  color:var(--gray);
  line-height:1.5;
}

.privacy-note {
  background:rgba(16,185,129,0.03)!important;
  border:1px solid rgba(16,185,129,0.1)!important;
}

.privacy-note h3 {
  font-size:1.05rem;
  margin-bottom:8px;
}

.privacy-note p {
  font-size:.9rem;
  color:var(--text-secondary);
  margin:0;
}

.load-overlay {
  position:fixed;
  inset:0;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(8px);
  display:none;
  align-items:center;
  justify-content:center;
  z-index:9999;
  flex-direction:column;
  gap:1rem;
}

.load-overlay.active {
  display:flex;
}

.load-spinner {
  width:48px;
  height:48px;
  border:4px solid #e2e8f0;
  border-top-color:var(--primary);
  border-radius:50%;
  animation:spin .8s linear infinite;
}

@keyframes spin {
  to {
    transform:rotate(360deg);
  }
}

}
.load-overlay p {
  color:var(--gray);
  font-weight:500;
  font-size:.95rem;
}

.toast-msg {
  position:fixed;
  top:20px;
  right:20px;
  z-index:9999;
  max-width:360px;
  padding:.9rem 1.15rem;
  border-radius:12px;
  background:var(--bg-card);
  box-shadow:0 8px 30px rgba(0,0,0,.12);
  border-left:4px solid var(--primary);
  display:flex;
  align-items:center;
  gap:10px;
  font-size:.88rem;
  animation:slideIn .3s ease;
  font-weight:500;
}

.toast-msg.success {
  border-left-color:var(--success);
}

.toast-msg.danger {
  border-left-color:var(--danger);
}

.toast-msg.warning {
  border-left-color:var(--warning);
}

.toast-msg.info {
  border-left-color:var(--info);
}

@keyframes slideIn {
  from {
    opacity:0;
    transform:translateX(40px);
  }
}

to {
  opacity:1;
  transform:translateX(0);
}

}
@media(max-width:768px) {
  .hero-section { padding:100px 0 60px; }
  .content-card { padding:24px 18px; }
  .case-grid { grid-template-columns:1fr; }
  .hero-stats { gap:20px; }
  .mode-grid { grid-template-columns:1fr; }
  .action-btns { flex-direction:column; }
  .file-info-cards { flex-direction:column; }
}

@media(max-width:480px) {
  .related-cards { grid-template-columns:1fr; }
  .hero-stats { flex-direction:column; gap:10px; }
  .steps-bar { flex-wrap:wrap; gap:6px; }
  .step-divider { display:none; }
}
#app-content[data-theme="dark"] {
  --bg-body:#0f172a;
  --bg-card:#1e293b;
  --text-primary:#f1f5f9;
  --text-secondary:#94a3b8;
  --text-muted:#64748b;
  --border:#334155;
  --shadow:0 4px 24px rgba(0,0,0,0.3);
  --primary-light:rgba(67,97,238,0.12);
  --dark:#f1f5f9;
  --gray:#94a3b8;
  --light:#1e293b;
  --bg-gradient:linear-gradient(160deg,#0f172a 0%,#1e293b 100%);
}
#app-content[data-theme="dark"] .case-card {
  background:#334155;
}
#app-content[data-theme="dark"] .case-card h3 {
  color:#f8fafc;
}
#app-content[data-theme="dark"] .case-card .case-detail {
  color:#cbd5e1;
}
#app-content[data-theme="dark"] .case-detail strong {
  color:#10b981;
}
#app-content[data-theme="dark"] .options-panel h5 {
  color:#f8fafc;
}
#app-content[data-theme="dark"] .equal-input-group input {
  background:#1e293b;
  color:#f8fafc;
  border-color:#475569;
}

#app-content[data-theme="light"] {
  --bg-body:#f8fafc;
  --bg-card:#ffffff;
  --text-primary:#1e293b;
  --text-secondary:#475569;
  --text-muted:#94a3b8;
  --border:#e2e8f0;
  --shadow:0 4px 24px rgba(67,97,238,0.08);
  --primary-light:rgba(67,97,238,0.08);
  --dark:#1a1a2e;
  --gray:#6c757d;
  --light:#f8f9fa;
  --bg-gradient:linear-gradient(160deg,#f0f4ff 0%,#e8ffe8 40%,#f5f0ff 100%);
}

#floatThemeToggle {
  position:fixed;
  top:100px;
  right:20px;
  width:48px;
  height:48px;
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:50%;
  cursor:pointer;
  z-index:1000;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--text-primary);
  font-size:1.2rem;
  box-shadow:var(--shadow);
  transition:all .3s;
}

#floatThemeToggle:hover {
  background:var(--primary);
  color:#fff;
  border-color:var(--primary);
}

#backToTop {
  position:fixed;
  bottom:30px;
  right:20px;
  width:48px;
  height:48px;
  background:var(--primary);
  border:none;
  border-radius:50%;
  cursor:pointer;
  z-index:1000;
  display:none;
  align-items:center;
  justify-content:center;
  color:#fff;
  font-size:1.2rem;
  box-shadow:0 10px 20px rgba(0,0,0,0.2);
  transition:all .3s;
}

#backToTop:hover {
  background:var(--primary-dark);
  transform:translateY(-3px);
}

#backToTop.show {
  display:flex;
}