/* ===== CSS Variables ===== */
:root {
  --primary: #e5322d;
  --primary-hover: #c92a26;
  --primary-glow: rgba(229, 50, 45, 0.3);
  --background: #0a0a0b;
  --surface: #111113;
  --surface-hover: #1a1a1d;
  --surface-border: #222225;
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --success: #22c55e;
  --warning: #f59e0b;
  --error: #ef4444;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: 0.2s ease;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--surface-border);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), #ff6b6b);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
}

.mobile-menu {
  display: none;
  flex-direction: column;
  padding: 16px 24px;
  background: var(--surface);
  border-top: 1px solid var(--surface-border);
}

.mobile-menu.active {
  display: flex;
}

.mobile-nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 12px 0;
  font-weight: 500;
  border-bottom: 1px solid var(--surface-border);
}

@media (max-width: 768px) {
  .nav {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--primary-glow), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(139, 92, 246, 0.1), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.hero-badge svg {
  color: var(--primary);
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), #ff6b6b, #ffa500);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 0 20px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--primary-glow);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

.btn-secondary:hover {
  background: var(--surface-hover);
  border-color: var(--text-muted);
}

/* ===== Hero Stats ===== */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  flex-wrap: wrap;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--surface-border);
}

@media (max-width: 640px) {
  .stat-divider {
    display: none;
  }
  .hero-stats {
    gap: 24px;
  }
}

/* ===== Tools Section ===== */
.tools-section {
  padding: 80px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-description {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

/* ===== Search ===== */
.search-container {
  position: relative;
  max-width: 400px;
  margin: 0 auto 48px;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-input {
  width: 100%;
  padding: 14px 16px 14px 48px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.9375rem;
  outline: none;
  transition: all var(--transition);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.search-input::placeholder {
  color: var(--text-muted);
}

/* ===== Tools Grid ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* ===== Tool Card ===== */
.tool-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.tool-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: var(--shadow-lg), 0 0 30px var(--primary-glow);
}

.tool-card:hover::before {
  opacity: 1;
}

.tool-card-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 12px;
}

.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tool-card-content {
  flex: 1;
  min-width: 0;
}

.tool-name {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.tool-description {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.tool-arrow {
  position: absolute;
  bottom: 24px;
  right: 24px;
  color: var(--text-muted);
  transition: all var(--transition);
}

.tool-card:hover .tool-arrow {
  color: var(--primary);
  transform: translateX(4px);
}

/* ===== About Section ===== */
.about-section {
  padding: 80px 0;
  background: var(--surface);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--background);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary), #ff6b6b);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: white;
}

.feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-description {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* ===== Contact Section ===== */
.contact-section {
  padding: 80px 0;
}

.contact-cards {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px 48px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition);
}

.contact-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  box-shadow: 0 0 30px var(--primary-glow);
}

.contact-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary), #ff6b6b);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.contact-label {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.contact-value {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* ===== Footer ===== */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--surface-border);
  padding: 60px 0 24px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-description {
  color: var(--text-muted);
  font-size: 0.875rem;
  max-width: 300px;
}

.footer-links h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-links a {
  display: block;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
  padding: 6px 0;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--surface-border);
  font-size: 0.875rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom .heart {
  color: var(--primary);
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s ease;
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px;
  border-bottom: 1px solid var(--surface-border);
}

.modal-title-wrapper {
  display: flex;
  align-items: center;
  gap: 16px;
}

.modal-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-description {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.modal-body {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  padding: 24px;
  border-top: 1px solid var(--surface-border);
}

/* ===== Upload Area ===== */
.upload-area {
  border: 2px dashed var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
}

.upload-area:hover,
.upload-area.dragover {
  border-color: var(--primary);
  background: rgba(229, 50, 45, 0.05);
}

.upload-icon {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.upload-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.upload-subtext {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ===== File List ===== */
.file-list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--background);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
}

.file-icon {
  width: 40px;
  height: 40px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-size {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.file-remove {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all var(--transition);
}

.file-remove:hover {
  color: var(--error);
  background: rgba(239, 68, 68, 0.1);
}

/* ===== Tool Options ===== */
.tool-options {
  margin-top: 24px;
  padding: 20px;
  background: var(--background);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius);
  display: none;
}

.tool-options.active {
  display: block;
}

.option-group {
  margin-bottom: 20px;
}

.option-group:last-child {
  margin-bottom: 0;
}

.option-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.option-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  transition: all var(--transition);
}

.option-input:focus {
  border-color: var(--primary);
}

.option-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  cursor: pointer;
}

.option-range {
  width: 100%;
  height: 8px;
  background: var(--surface-border);
  border-radius: 4px;
  outline: none;
  -webkit-appearance: none;
}

.option-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
}

.option-value {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* ===== Progress ===== */
.progress-container {
  margin-top: 24px;
  display: none;
}

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

.progress-bar {
  height: 8px;
  background: var(--surface-border);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #ff6b6b);
  border-radius: 4px;
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 12px;
}

/* ===== Result Area ===== */
.result-area {
  margin-top: 24px;
  text-align: center;
  display: none;
}

.result-area.active {
  display: block;
}

.result-icon {
  color: var(--success);
  margin-bottom: 16px;
}

.result-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 20px;
}

.download-btn {
  padding: 16px 32px;
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tool-card {
  animation: fadeIn 0.5s ease forwards;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--background);
}

::-webkit-scrollbar-thumb {
  background: var(--surface-border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}