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

:root {
  --color-primary: #8b5cf6;
  --color-primary-hover: #7c3aed;
  --color-primary-glow: rgba(139, 92, 246, 0.15);
  --color-primary-dim: rgba(139, 92, 246, 0.25);
  --color-bg: #0a0a0b;
  --color-surface: #111113;
  --color-card: #111113;
  --color-card-hover: #17171a;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.14);
  --color-text: #ffffff;
  --color-text-muted: #888893;
  --color-text-dim: #55555f;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --radius: 8px;
  --radius-lg: 12px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100vh;
  position: relative;
  /* subtle grid pattern like Evervault */
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  background-attachment: fixed;
}

body::after {
  content: '';
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 75vh;
  pointer-events: none;
  z-index: 0;
  background: linear-gradient(
    to top,
    rgba(139, 92, 246, 0.5) 0%,
    rgba(139, 92, 246, 0.25) 30%,
    rgba(139, 92, 246, 0.1) 55%,
    transparent 85%
  );
}

/* Header */
.header {
  background: rgba(10, 10, 11, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  padding: 0.875rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo-img {
  height: 1.35rem;
  width: auto;
  display: block;
}

.logo-dot {
  color: var(--color-primary);
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav a:hover,
.nav a.active {
  color: var(--color-text);
}

/* Main content */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
  position: relative;
  z-index: 1;
}

/* Page title */
.page-title {
  font-size: 3rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--color-text);
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.page-subtitle {
  color: var(--color-text-muted);
  margin: 0 0 2rem;
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  font-family: inherit;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--color-primary-glow);
}

.btn-primary:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

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

.btn-secondary:hover {
  border-color: var(--color-border-hover);
  background: rgba(255, 255, 255, 0.04);
}

/* Tool cards (home & fd-tools index) */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.tool-card {
  background: rgba(17, 17, 19, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: 14px;
  padding: 1.5rem;
  box-shadow: none;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: all 0.25s ease;
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.tool-card > * {
  position: relative;
  z-index: 1;
}

.tool-card::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 75%;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(
    to top,
    rgba(139, 92, 246, 0.45) 0%,
    rgba(139, 92, 246, 0.18) 40%,
    rgba(139, 92, 246, 0.05) 65%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.tool-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 1;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-primary) 30%,
    rgba(139, 92, 246, 0.6) 50%,
    var(--color-primary) 70%,
    transparent 100%
  );
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: rgba(139, 92, 246, 0.35);
  background: rgba(23, 23, 26, 0.85);
  box-shadow:
    0 0 0 1px rgba(139, 92, 246, 0.2),
    0 20px 40px -12px rgba(0, 0, 0, 0.5),
    0 0 60px -20px rgba(139, 92, 246, 0.25);
}

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

.tool-card-icon {
  font-size: 1.75rem;
  margin-bottom: 1rem;
  display: block;
}

.tool-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.tool-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Upload zone */
.upload-zone {
  background: var(--color-card);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  margin-bottom: 1.5rem;
}

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

.upload-zone.has-file {
  border-style: solid;
  border-color: var(--color-primary);
  background: var(--color-primary-glow);
}

.upload-zone-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  opacity: 0.5;
  display: block;
}

.upload-zone-text {
  font-size: 0.9375rem;
  color: var(--color-text);
  margin-bottom: 0.35rem;
  font-weight: 500;
}

.upload-zone-hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.upload-zone input[type="file"] {
  display: none;
}

/* Options panel */
.options-panel {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
}

.options-title {
  font-size: 0.75rem;
  font-weight: 600;
  margin: 0 0 1rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}

.option-group label {
  display: block;
  font-size: 0.75rem;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.option-group input[type="text"] {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
  font-family: inherit;
  transition: border-color 0.2s, background 0.2s;
}

.option-group input[type="text"]:focus {
  outline: none;
  border-color: var(--color-primary);
  background: rgba(139, 92, 246, 0.04);
}

.option-group input[type="text"]::placeholder {
  color: var(--color-text-dim);
}

.option-group select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
  font-family: inherit;
  cursor: pointer;
  transition: border-color 0.2s;
  -webkit-appearance: none;
  appearance: none;
  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='%23888893' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.option-group select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.option-group select option {
  background: #1a1a1e;
  color: var(--color-text);
}

/* Action button wrap */
.action-btn-wrap {
  margin: 2rem 0;
  text-align: center;
}

/* Progress */
.progress-wrap {
  margin: 1.5rem 0;
  display: none;
}

.progress-wrap.visible {
  display: block;
}

.progress-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

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

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

.progress-bar {
  height: 3px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: var(--color-primary);
  width: 0%;
  transition: width 0.2s ease-out;
}

.progress-text {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

/* Result section */
.result-section {
  display: none;
  margin-top: 1.5rem;
}

.result-section.visible {
  display: block;
}

.result-card {
  background: var(--color-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
}

.result-title {
  font-size: 0.75rem;
  font-weight: 600;
  margin: 0 0 1rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.result-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

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

.result-stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.03em;
  display: block;
}

.result-stat-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.result-download {
  text-align: center;
}

.result-download .btn {
  min-width: 240px;
}

/* Error state */
.error-message {
  background: rgba(255, 59, 48, 0.07);
  color: #ff7b73;
  border: 1px solid rgba(255, 59, 48, 0.18);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin: 1rem 0;
  font-size: 0.875rem;
  display: none;
}

.error-message.visible {
  display: block;
}

/* Success state */
.success-message {
  background: var(--color-primary-glow);
  color: var(--color-primary);
  border: 1px solid var(--color-primary-dim);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin: 1rem 0;
  font-size: 0.875rem;
  display: none;
}

.success-message.visible {
  display: block;
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0;
  position: relative;
  z-index: 2;
}

.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.breadcrumb a:hover {
  color: var(--color-text);
}

.breadcrumb-sep {
  margin: 0 0.4rem;
  opacity: 0.35;
  font-size: 0.75rem;
}

/* Image to URL result layout */
.result-url-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.result-url-input {
  flex: 1;
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.result-url-input:focus {
  outline: none;
  border-color: var(--color-primary);
}