/* ==========================================================================
   TOOLIX INK DESIGN SYSTEM
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:ital,wght@0,400..700;1,400..700&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Fonts */
  --font-display: 'Instrument Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Typography Scale */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-md: 0.9375rem;  /* 15px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.375rem;   /* 22px */
  --text-2xl: 2rem;      /* 32px */
  --text-display: 3.5rem;/* 56px */

  /* Spacing Scale (8pt Grid) */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-xxl: 48px;
  --space-xxxl: 64px;
  --space-mega: 96px;

  /* Borders & Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  
  /* Transitions */
  --transition-fast: 120ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Light Theme Colors (Default) */
  --bg-primary: #F7F8FA;      /* Pure Light Slate / Sand-adjacent */
  --bg-secondary: #FFFFFF;    /* Pure White for Lifted Cards */
  --bg-tertiary: #F1F3F5;     /* Soft Grey Hover */
  --text-primary: #1E293B;    /* Slate 900 (High Contrast Soft Black) */
  --text-secondary: #475569;  /* Slate 600 */
  --text-muted: #64748B;      /* Slate 500 */
  --border-subtle: #E2E8F0;   /* Light Slate Grey Border */
  --border-focus: #1E293B;    /* Focus Border */
  --accent: #E54B4B;          /* Crimson / Merging Coral */
  --accent-light: #FFF1F1;    
  --accent-error: #A83232;    
  --accent-error-light: #FDF2F2;
  
  --shadow-flat: 2px 2px 0px rgba(30, 41, 59, 0.05);
}

/* Dark Theme Colors Override */
[data-theme="dark"] {
  --bg-primary: #0B0C10;      /* Deep Ink / Charcoal Slate */
  --bg-secondary: #161B22;    /* Card Deep Grey */
  --bg-tertiary: #21262D;     /* Dark Hover */
  --text-primary: #C9D1D9;    /* Light Grey Text */
  --text-secondary: #8B949E;  
  --text-muted: #484F58;      
  --border-subtle: #30363D;   
  --border-focus: #C9D1D9;    
  --accent: #FF6B6B;          
  --accent-light: #2D1414;    
  --accent-error: #E05A5A;    
  --accent-error-light: #2A1515;

  --shadow-flat: 2px 2px 0px rgba(201, 209, 217, 0.03);
}

/* ==========================================================================
   RESET & SYSTEM BASICS
   ========================================================================== */

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

html, body {
  height: 100%;
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: inherit;
  text-decoration: none;
}

/* ==========================================================================
   TYPOGRAPHY UTILITIES
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-md { font-size: var(--text-md); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-display { font-size: var(--text-display); }

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

.text-secondary {
  color: var(--text-secondary);
}

/* ==========================================================================
   LAYOUT CONTAINERS
   ========================================================================== */

.container {
  max-width: 1200px;
  margin-right: auto;
  margin-left: auto;
  padding-right: var(--space-lg);
  padding-left: var(--space-lg);
}

.workspace-container {
  max-width: 1400px;
  margin-right: auto;
  margin-left: auto;
  padding: var(--space-lg);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 1024px) {
  .workspace-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: var(--space-xl);
    align-items: start;
  }
}

/* ==========================================================================
   UI COMPONENTS
   ========================================================================== */

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
  color: var(--text-primary);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--text-secondary);
  border-color: var(--text-secondary);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-secondary);
  border-color: var(--text-muted);
}

.btn-danger {
  background-color: var(--accent-error-light);
  border-color: var(--accent-error);
  color: var(--accent-error);
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--accent-error);
  color: #FFFFFF;
}

.btn-icon {
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
}

/* Inputs & Form Fields */
.form-group {
  margin-bottom: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.input, .select {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast);
  outline: none;
  width: 100%;
}

.input:focus, .select:focus {
  border-color: var(--border-focus);
}

/* Custom Checkbox/Radio */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  cursor: pointer;
  user-select: none;
}

.checkbox {
  appearance: none;
  width: 16px;
  height: 16px;
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
  background-color: var(--bg-primary);
  display: grid;
  place-content: center;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.checkbox:checked {
  background-color: var(--text-primary);
  border-color: var(--text-primary);
}

.checkbox:checked::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--bg-primary);
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}

/* File Upload Zone */
.upload-zone {
  border: 1px dashed var(--border-subtle);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-xxl) var(--space-md);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  position: relative;
}

.upload-zone:hover {
  border-color: var(--text-muted);
}

.upload-zone.dragover {
  border-color: var(--border-focus);
  background-color: var(--bg-tertiary);
  transform: scale(1.005);
}

.upload-zone input[type="file"] {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.upload-zone-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background-color: var(--bg-primary);
}

/* Cards & Grid Lists */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-lg);
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.card-interactive {
  cursor: pointer;
}

.card-interactive:hover {
  border-color: var(--border-focus);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .card-interactive:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

/* Card specific tool-accent styling using custom data-id variables */
.card-interactive[data-id] {
  transition: border-color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.card-interactive[data-id]:hover {
  border-color: var(--tool-accent) !important;
}

.card-interactive[data-id] svg {
  color: var(--tool-accent);
  transition: color var(--transition-fast);
}

/* Tool specific accent color variables mapped to data-id properties */
.card[data-id="pdf-merge"] {
  --tool-accent: #E54B4B; /* Red-Orange */
  --tool-accent-bg: #FFF1F1;
}
[data-theme="dark"] .card[data-id="pdf-merge"] {
  --tool-accent: #FF6B6B;
  --tool-accent-bg: #2D1414;
}

.card[data-id="pdf-split"] {
  --tool-accent: #F37021; /* Orange-Coral */
  --tool-accent-bg: #FFF5EE;
}
[data-theme="dark"] .card[data-id="pdf-split"] {
  --tool-accent: #FF924A;
  --tool-accent-bg: #2D1D14;
}

.card[data-id="pdf-compress"] {
  --tool-accent: #4EAF47; /* Grass Green */
  --tool-accent-bg: #EFFEEF;
}
[data-theme="dark"] .card[data-id="pdf-compress"] {
  --tool-accent: #6AD063;
  --tool-accent-bg: #142D16;
}

.card[data-id="pdf-image-to-pdf"] {
  --tool-accent: #0078D4; /* Ocean Blue */
  --tool-accent-bg: #F0F6FC;
}
[data-theme="dark"] .card[data-id="pdf-image-to-pdf"] {
  --tool-accent: #3A96DD;
  --tool-accent-bg: #14212D;
}

.card[data-id="pdf-pdf-to-image"] {
  --tool-accent: #008272; /* Teal / Mint */
  --tool-accent-bg: #E0F2F1;
}
[data-theme="dark"] .card[data-id="pdf-pdf-to-image"] {
  --tool-accent: #00BFA5;
  --tool-accent-bg: #0C2B27;
}

.card[data-id="pdf-rotate"] {
  --tool-accent: #8C4F8C; /* Royal Purple */
  --tool-accent-bg: #F8EDF8;
}
[data-theme="dark"] .card[data-id="pdf-rotate"] {
  --tool-accent: #C77CC7;
  --tool-accent-bg: #2B142B;
}

/* Style the first container element (icon-wrapper) automatically to match its accent color */
.card-interactive[data-id] div:first-child {
  background-color: var(--tool-accent-bg) !important;
  border: 1px solid var(--tool-accent-bg) !important;
  color: var(--tool-accent) !important;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast) !important;
}

.card-interactive[data-id]:hover div:first-child {
  border-color: var(--tool-accent) !important;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

/* File Previews List */
.file-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.file-card {
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-sm);
  aspect-ratio: 4/5;
  justify-content: space-between;
  cursor: grab;
  user-select: none;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.file-card:hover {
  border-color: var(--text-secondary);
}

.file-card:active {
  cursor: grabbing;
}

.file-card-preview {
  flex-grow: 1;
  width: 100%;
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  background-color: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  font-size: var(--text-xs);
  color: var(--text-muted);
  position: relative;
}

.file-card-preview canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.file-card-name {
  font-size: var(--text-xs);
  font-weight: 500;
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-primary);
}

.file-card-meta {
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.file-card-remove {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1;
  opacity: 0.8;
  transition: opacity var(--transition-fast), border-color var(--transition-fast);
}

.file-card-remove:hover {
  opacity: 1;
  color: var(--accent-error);
  border-color: var(--accent-error);
}

/* Drag & Drop Reordering Specific Visuals */
.file-card.dragging {
  opacity: 0.5;
  border: 1px dashed var(--border-focus);
}

/* Minimal Progress Indicator */
.progress-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.progress-track {
  height: 4px;
  background-color: var(--border-subtle);
  border-radius: 2px;
  overflow: hidden;
  width: 100%;
}

.progress-fill {
  height: 100%;
  background-color: var(--text-primary);
  width: 0%;
  transition: width 150ms ease-out;
}

/* Status Toasts & Alerts */
.alert {
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  margin-bottom: var(--space-lg);
  border: 1px solid transparent;
}

.alert-success {
  background-color: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.alert-error {
  background-color: var(--accent-error-light);
  border-color: var(--accent-error);
  color: var(--accent-error);
}

/* Header & Navigation */
.header-bar {
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--bg-primary);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.logo {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.03em;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.logo-accent {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  list-style: none;
}

.nav-link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

/* Footer Styling */
.footer-bar {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-xl) 0;
  background-color: var(--bg-primary);
  margin-top: var(--space-mega);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    text-align: left;
  }
}

/* ==========================================================================
   HOMEPAGE — HERO, SEARCH, TRUST BAR
   ========================================================================== */

.hero-section {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--space-xxl) auto;
}

.hero-headline {
  margin-bottom: var(--space-md);
  letter-spacing: -0.04em;
}

.hero-subline {
  font-weight: 300;
  max-width: 600px;
  margin: 0 auto var(--space-xl) auto;
  line-height: 1.7;
}

/* Search wrapper */
.search-wrapper {
  max-width: 520px;
  margin: 0 auto var(--space-lg) auto;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon-wrap {
  position: absolute;
  left: var(--space-md);
  color: var(--text-muted);
  pointer-events: none;
  display: flex;
  align-items: center;
}

.search-input {
  padding: var(--space-md) var(--space-xl) var(--space-md) calc(var(--space-md) + 24px);
  font-size: var(--text-md);
  border-radius: var(--radius-md);
  text-align: left;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  box-shadow: 0 0 0 3px rgba(30, 41, 59, 0.08);
}

[data-theme="dark"] .search-input:focus {
  box-shadow: 0 0 0 3px rgba(201, 209, 217, 0.08);
}

.search-shortcut {
  position: absolute;
  right: var(--space-md);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: 3px;
  padding: 2px 6px;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.search-input:focus ~ .search-shortcut {
  opacity: 0;
}

/* Trust bar */
.trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.trust-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  border-radius: 999px;
  padding: 4px 10px;
  background: var(--bg-secondary);
  letter-spacing: 0.01em;
}

.trust-pill svg {
  color: #4EAF47;
  flex-shrink: 0;
}

[data-theme="dark"] .trust-pill svg {
  color: #6AD063;
}

/* ==========================================================================
   HOMEPAGE — SECTION HEADER
   ========================================================================== */

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.view-all-link {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

/* ==========================================================================
   HOMEPAGE — TOOL CARDS
   ========================================================================== */

.tool-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
}

.tool-icon-wrap {
  border: 1px solid var(--border-subtle);
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  /* Icon animates on card hover */
  transition: transform var(--transition-normal), border-color var(--transition-fast), background-color var(--transition-fast);
}

.tool-card:hover .tool-icon-wrap {
  transform: scale(1.1) rotate(-4deg);
}

.tool-badge {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
}

.tool-title {
  margin-bottom: var(--space-xs);
  transition: color var(--transition-fast);
}

.tool-card:hover .tool-title {
  color: var(--tool-accent, var(--text-primary));
}

.tool-desc {
  line-height: 1.6;
  flex-grow: 1;
}

/* "Open Tool →" CTA — hidden by default, slides in on hover */
.tool-cta {
  display: block;
  margin-top: var(--space-md);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--tool-accent, var(--text-primary));
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.tool-card:hover .tool-cta {
  opacity: 1;
  transform: translateX(0);
}