/* ================================================================
   PDF Pro Tool Suite — Complete Design System
   Premium UI with Glassmorphism, Animations & Theme System
   ================================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ================================================================
   1. CSS CUSTOM PROPERTIES — THEME SYSTEM
   ================================================================ */
:root {
  /* ── Light Theme (Default) ── */
  --bg-body: #eef2f7;
  --bg-primary: #f0f4f8;
  --bg-secondary: #ffffff;
  --bg-elevated: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.65);
  --bg-glass-heavy: rgba(255, 255, 255, 0.85);
  --bg-glass-border: rgba(255, 255, 255, 0.5);
  --bg-hover: rgba(0, 0, 0, 0.04);
  --bg-active: rgba(0, 0, 0, 0.08);
  --bg-dropzone: rgba(59, 130, 246, 0.04);
  --bg-dropzone-hover: rgba(59, 130, 246, 0.1);
  --bg-gradient: linear-gradient(135deg, #e0e7ff 0%, #f0f4f8 50%, #fce7f3 100%);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-inverse: #ffffff;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --border-focus: var(--accent);
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --overlay: rgba(0, 0, 0, 0.4);
  --sidebar-bg: rgba(255, 255, 255, 0.75);
  --header-bg: rgba(255, 255, 255, 0.8);
  --toast-bg: #0f172a;
  --toast-text: #f1f5f9;
  --scrollbar-track: #f1f5f9;
  --scrollbar-thumb: #cbd5e1;
  --code-bg: #f1f5f9;

  /* ── Accent Color (Default: Ocean Blue) ── */
  --accent-h: 217;
  --accent-s: 91%;
  --accent-l: 60%;
  --accent: hsl(var(--accent-h), var(--accent-s), var(--accent-l));
  --accent-hover: hsl(var(--accent-h), var(--accent-s), calc(var(--accent-l) - 8%));
  --accent-light: hsl(var(--accent-h), var(--accent-s), 80%);
  --accent-lighter: hsl(var(--accent-h), var(--accent-s), 92%);
  --accent-dark: hsl(var(--accent-h), var(--accent-s), 42%);
  --accent-bg: hsl(var(--accent-h), 80%, 96%);
  --accent-glow: hsla(var(--accent-h), var(--accent-s), var(--accent-l), 0.35);
  --accent-gradient: linear-gradient(135deg, hsl(var(--accent-h), var(--accent-s), var(--accent-l)), hsl(calc(var(--accent-h) + 30), var(--accent-s), var(--accent-l)));

  /* ── Layout ── */
  --sidebar-width: 272px;
  --sidebar-collapsed-width: 68px;
  --header-height: 62px;
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* ── Transitions ── */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.45, 0, 0.55, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --t-fast: 0.15s;
  --t-normal: 0.25s;
  --t-slow: 0.4s;

  /* ── Z-Index Scale ── */
  --z-sidebar: 100;
  --z-header: 200;
  --z-dropdown: 300;
  --z-modal: 500;
  --z-toast: 600;
  --z-tooltip: 700;
}

/* ── Dark Theme ── */
[data-theme="dark"] {
  --bg-body: #060b18;
  --bg-primary: #0b1120;
  --bg-secondary: #111827;
  --bg-elevated: #1a2540;
  --bg-glass: rgba(10, 18, 35, 0.75);
  --bg-glass-heavy: rgba(10, 18, 35, 0.9);
  --bg-glass-border: rgba(255, 255, 255, 0.08);
  --bg-hover: rgba(255, 255, 255, 0.06);
  --bg-active: rgba(255, 255, 255, 0.1);
  --bg-dropzone: rgba(59, 130, 246, 0.06);
  --bg-dropzone-hover: rgba(59, 130, 246, 0.15);
  --bg-gradient: linear-gradient(135deg, #0b1120 0%, #111827 50%, #1a1030 100%);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #4b5e78;
  --text-inverse: #0f172a;
  --border-color: #1e3050;
  --border-light: #162035;
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --overlay: rgba(0, 0, 0, 0.65);
  --sidebar-bg: rgba(10, 18, 35, 0.85);
  --header-bg: rgba(10, 18, 35, 0.85);
  --toast-bg: #f1f5f9;
  --toast-text: #0f172a;
  --scrollbar-track: #111827;
  --scrollbar-thumb: #2d3f5e;
  --code-bg: #0b1120;
  --accent-bg: hsla(var(--accent-h), 50%, 20%, 0.3);
  --accent-lighter: hsla(var(--accent-h), 50%, 25%, 0.3);
}

/* ── Accent Theme Variants ── */
[data-accent="blue"] { --accent-h: 217; --accent-s: 91%; --accent-l: 60%; }
[data-accent="purple"] { --accent-h: 263; --accent-s: 90%; --accent-l: 58%; }
[data-accent="red"] { --accent-h: 0; --accent-s: 84%; --accent-l: 60%; }
[data-accent="green"] { --accent-h: 160; --accent-s: 84%; --accent-l: 39%; }
[data-accent="orange"] { --accent-h: 25; --accent-s: 95%; --accent-l: 53%; }
[data-accent="pink"] { --accent-h: 330; --accent-s: 81%; --accent-l: 60%; }

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--t-slow) var(--ease-out), color var(--t-normal) var(--ease-out);
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, var(--accent-glow), transparent 60%),
    radial-gradient(ellipse at 80% 20%, hsla(calc(var(--accent-h) + 60), 70%, 60%, 0.1), transparent 50%);
  pointer-events: none;
  z-index: 0;
  animation: ambientShift 20s ease-in-out infinite alternate;
}

a { color: var(--accent); text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; }
input, select, textarea { font-family: inherit; }
::selection { background: var(--accent); color: var(--text-inverse); }

/* ================================================================
   3. TYPOGRAPHY
   ================================================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

.text-xs { font-size: 0.75rem; }
.text-sm { font-size: 0.8125rem; }
.text-base { font-size: 0.9375rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-3xl { font-size: 2rem; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--accent); }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* ================================================================
   4. APP LAYOUT
   ================================================================ */
.app-layout {
  display: flex;
  height: 100vh;
  position: relative;
  z-index: 1;
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--sidebar-bg);
  backdrop-filter: blur(24px) saturate(1.8);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  border-right: 1px solid var(--bg-glass-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  z-index: var(--z-sidebar);
  transition: width var(--t-normal) var(--ease-out), transform var(--t-normal) var(--ease-out);
  overflow: hidden;
}

.sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-brand .brand-icon {
  width: 38px;
  height: 38px;
  background: var(--accent-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.sidebar-brand .brand-text {
  display: flex;
  flex-direction: column;
}

.sidebar-brand .brand-name {
  font-size: 1.1rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.sidebar-brand .brand-tagline {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 10px;
}

.sidebar-nav::-webkit-scrollbar { width: 4px; }
.sidebar-nav::-webkit-scrollbar-track { background: transparent; }
.sidebar-nav::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }

.nav-section {
  margin-bottom: 6px;
}

.nav-section-title {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  padding: 12px 12px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: all var(--t-fast) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.nav-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  transform: translateX(2px);
}

.nav-item.active {
  background: var(--accent-bg);
  color: var(--accent);
  font-weight: 600;
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent);
  border-radius: 0 4px 4px 0;
}

.nav-item i, .nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  opacity: 0.75;
}

.nav-item.active i, .nav-item.active svg {
  opacity: 1;
}

.nav-item .nav-badge {
  margin-left: auto;
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: var(--radius-full);
  min-width: 20px;
  text-align: center;
}

/* ── Main Area ── */
.main-area {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  height: 100vh;
  transition: margin-left var(--t-normal) var(--ease-out);
}

/* ── Header ── */
.app-header {
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(24px) saturate(1.8);
  -webkit-backdrop-filter: blur(24px) saturate(1.8);
  border-bottom: 1px solid var(--bg-glass-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.header-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ── Theme Switcher ── */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--t-fast) var(--ease-out);
  cursor: pointer;
}

.theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* ── Accent Color Picker ── */
.accent-picker {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
}

.accent-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-spring);
  position: relative;
}

.accent-dot:hover {
  transform: scale(1.25);
}

.accent-dot.active {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 2px var(--bg-secondary);
  transform: scale(1.2);
}

.accent-dot[data-color="blue"] { background: hsl(217, 91%, 60%); }
.accent-dot[data-color="purple"] { background: hsl(263, 90%, 58%); }
.accent-dot[data-color="red"] { background: hsl(0, 84%, 60%); }
.accent-dot[data-color="green"] { background: hsl(160, 84%, 39%); }
.accent-dot[data-color="orange"] { background: hsl(25, 95%, 53%); }
.accent-dot[data-color="pink"] { background: hsl(330, 81%, 60%); }

/* ── Main Content ── */
.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 28px;
}

.main-content::-webkit-scrollbar { width: 6px; }
.main-content::-webkit-scrollbar-track { background: var(--scrollbar-track); }
.main-content::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 3px;
}
.main-content::-webkit-scrollbar-thumb:hover { background: var(--accent-light); }

/* ================================================================
   5. TOOL PANELS
   ================================================================ */
.tool-panel {
  display: none;
  animation: panelIn 0.4s var(--ease-out);
}

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

.tool-header {
  margin-bottom: 24px;
}

.tool-header h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tool-header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.tool-body {
  display: grid;
  gap: 24px;
}

.tool-body.two-col {
  grid-template-columns: 1fr 1fr;
}

/* ================================================================
   6. CARDS
   ================================================================ */
.card {
  background: var(--bg-glass-heavy);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  transition: all var(--t-normal) var(--ease-out);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-title {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
}

.card-title i {
  color: var(--accent);
}

/* ================================================================
   7. DROPZONE
   ================================================================ */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--t-normal) var(--ease-out);
  background: var(--bg-dropzone);
  position: relative;
  overflow: hidden;
}

.dropzone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity var(--t-normal) var(--ease-out);
}

.dropzone:hover,
.dropzone.drag-over {
  border-color: var(--accent);
  background: var(--bg-dropzone-hover);
  transform: scale(1.005);
  box-shadow: 0 0 20px var(--accent-glow);
}

.dropzone.drag-over::before {
  opacity: 0.05;
}

.dropzone-icon {
  font-size: 1.6rem;
  color: var(--accent);
  margin-bottom: 4px;
  position: relative;
  animation: float 3s ease-in-out infinite;
}

.dropzone-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
  position: relative;
}

.dropzone-subtext {
  font-size: 0.825rem;
  color: var(--text-muted);
  position: relative;
}

.dropzone-subtext span {
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.dropzone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

/* ================================================================
   8. FILE LIST
   ================================================================ */
.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: all var(--t-fast) var(--ease-out);
  cursor: grab;
  user-select: none;
}

.file-item:hover {
  border-color: var(--accent-light);
  box-shadow: var(--shadow-sm);
}

.file-item.dragging {
  opacity: 0.5;
  transform: scale(0.98);
  border-color: var(--accent);
  box-shadow: 0 0 15px var(--accent-glow);
}

.file-item.drag-target {
  border-color: var(--accent);
  background: var(--accent-bg);
}

.file-drag-handle {
  color: var(--text-muted);
  cursor: grab;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.file-drag-handle span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 1px;
}

.file-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-bg);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

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

.file-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.file-actions {
  display: flex;
  gap: 6px;
}

.file-action-btn {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--t-fast) var(--ease-out);
  font-size: 0.8rem;
}

.file-action-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-bg);
}

.file-action-btn.danger:hover {
  color: hsl(0, 84%, 60%);
  border-color: hsl(0, 84%, 60%);
  background: hsl(0, 84%, 96%);
}

.file-order {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* ================================================================
   9. BUTTONS
   ================================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-out);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%), rgba(255,255,255,0.3) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.4s ease;
}

.btn:active::after {
  opacity: 1;
  transition: opacity 0s;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 14px;
}

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

.btn-danger {
  background: hsl(0, 84%, 60%);
  color: #fff;
}

.btn-danger:hover {
  background: hsl(0, 84%, 52%);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
  border-radius: var(--radius-md);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn-block {
  width: 100%;
}

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

/* ================================================================
   10. FORM CONTROLS
   ================================================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--t-fast) var(--ease-out);
  outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-textarea {
  resize: vertical;
  min-height: 80px;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* ── Range Slider ── */
.form-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  outline: none;
  cursor: pointer;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 2px 8px var(--accent-glow);
  cursor: pointer;
  transition: transform var(--t-fast) var(--ease-spring);
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* ── Toggle Switch ── */
.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}

.toggle input {
  display: none;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  background: var(--border-color);
  cursor: pointer;
  transition: all var(--t-normal) var(--ease-out);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  box-shadow: var(--shadow-sm);
  transition: transform var(--t-normal) var(--ease-spring);
}

.toggle input:checked + .toggle-slider {
  background: var(--accent);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* ── Checkbox & Radio ── */
.form-check {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
  cursor: pointer;
}

/* ── Inline Form Row ── */
.form-row {
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.form-row .form-group {
  flex: 1;
}

/* ================================================================
   11. TABS
   ================================================================ */
.tabs {
  display: flex;
  gap: 2px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 3px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.825rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-out);
}

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

.tab-btn.active {
  background: var(--bg-secondary);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.25s var(--ease-out);
}

/* ================================================================
   12. PROGRESS BAR
   ================================================================ */
.progress-wrapper {
  margin: 16px 0;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.progress-bar {
  height: 8px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: var(--radius-full);
  transition: width 0.5s var(--ease-out);
  position: relative;
}

.progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  animation: shimmer 1.5s infinite;
}

/* ================================================================
   13. THUMBNAIL GRID
   ================================================================ */
.thumbnail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
}

.thumbnail-item {
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 8px;
  text-align: center;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-out);
  position: relative;
}

.thumbnail-item:hover {
  border-color: var(--accent-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.thumbnail-item.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.thumbnail-item.selected::after {
  content: '✓';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.thumbnail-canvas {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--code-bg);
  border-radius: var(--radius-xs);
  margin-bottom: 6px;
  object-fit: contain;
}

.thumbnail-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ================================================================
   14. TOAST NOTIFICATIONS
   ================================================================ */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
  background: var(--toast-bg);
  color: var(--toast-text);
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  animation: toastIn 0.4s var(--ease-spring);
  pointer-events: auto;
  max-width: 380px;
}

.toast.toast-out {
  animation: toastOut 0.3s var(--ease-out) forwards;
}

.toast-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.toast.success .toast-icon { color: hsl(160, 84%, 39%); }
.toast.error .toast-icon { color: hsl(0, 84%, 60%); }
.toast.warning .toast-icon { color: hsl(45, 93%, 47%); }
.toast.info .toast-icon { color: hsl(217, 91%, 60%); }

/* ================================================================
   15. MODAL
   ================================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  backdrop-filter: blur(8px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--t-normal) var(--ease-out);
}

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

.modal {
  background: var(--bg-glass-heavy);
  backdrop-filter: blur(24px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-xl);
  padding: 32px;
  max-width: 560px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.9) translateY(20px);
  transition: transform var(--t-normal) var(--ease-spring);
}

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

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
}

.modal-close {
  width: 32px;
  height: 32px;
  border: none;
  background: var(--bg-hover);
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--t-fast) var(--ease-out);
}

.modal-close:hover {
  background: hsl(0, 84%, 95%);
  color: hsl(0, 84%, 60%);
}

/* ================================================================
   16. CREATOR BADGE
   ================================================================ */
.creator-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  margin-top: auto;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  background: transparent;
  transition: all var(--t-normal) var(--ease-out);
}

.creator-badge .creator-name {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  font-size: 0.9rem;
  animation: creatorGlow 3s ease-in-out infinite;
  position: relative;
}

.creator-badge .creator-heart {
  color: hsl(0, 84%, 60%);
  animation: heartbeat 1.5s ease-in-out infinite;
  font-size: 1rem;
}

.creator-badge:hover .creator-name {
  filter: brightness(1.3);
}

/* ================================================================
   17. PAGE PREVIEW CANVAS
   ================================================================ */
.page-preview {
  background: white;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.page-preview canvas {
  width: 100%;
  height: auto;
  display: block;
}

/* ================================================================
   18. RESULT SECTION
   ================================================================ */
.result-section {
  padding: 20px;
  background: var(--accent-bg);
  border: 1px solid var(--accent-light);
  border-radius: var(--radius-lg);
  display: none;
}

.result-section.active {
  display: block;
  animation: fadeIn 0.3s var(--ease-out);
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.result-title {
  font-weight: 700;
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-stats {
  display: flex;
  gap: 20px;
}

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

.result-stat-value {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
}

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

/* ================================================================
   19. LOADING STATES
   ================================================================ */
.loading-overlay {
  position: absolute;
  inset: 0;
  background: var(--overlay);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  z-index: 10;
  border-radius: inherit;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading-text {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-inverse);
}

/* ================================================================
   20. EMPTY STATE
   ================================================================ */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 16px;
  opacity: 0.4;
}

.empty-state-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.empty-state-text {
  font-size: 0.875rem;
}

/* ================================================================
   21. OCR OUTPUT
   ================================================================ */
.ocr-output {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.8;
  max-height: 400px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-word;
}

.ocr-confidence {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 700;
}

.ocr-confidence.high { background: hsl(160, 84%, 92%); color: hsl(160, 84%, 30%); }
.ocr-confidence.medium { background: hsl(45, 93%, 90%); color: hsl(45, 93%, 35%); }
.ocr-confidence.low { background: hsl(0, 84%, 92%); color: hsl(0, 84%, 40%); }

/* ================================================================
   22. DRAWING CANVAS
   ================================================================ */
.drawing-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.drawing-toolbar .tool-btn {
  width: 36px;
  height: 36px;
  border: 1px solid transparent;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--t-fast) var(--ease-out);
}

.drawing-toolbar .tool-btn:hover {
  background: var(--bg-hover);
}

.drawing-toolbar .tool-btn.active {
  background: var(--accent-bg);
  color: var(--accent);
  border-color: var(--accent);
}

.drawing-toolbar .separator {
  width: 1px;
  height: 24px;
  background: var(--border-color);
  margin: 0 4px;
}

.drawing-toolbar input[type="color"] {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 2px;
}

/* ================================================================
   23. COMPARISON VIEW
   ================================================================ */
.compare-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.compare-panel {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.compare-panel-header {
  padding: 12px 16px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ================================================================
   24. POSITION GRID (for watermark placement)
   ================================================================ */
.position-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  width: 120px;
}

.position-cell {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-out);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.6rem;
  color: var(--text-muted);
}

.position-cell:hover {
  border-color: var(--accent-light);
  background: var(--accent-bg);
}

.position-cell.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ================================================================
   25. WELCOME / HOME SCREEN
   ================================================================ */
.home-screen {
  text-align: center;
  padding: 40px 20px;
}

.home-title {
  font-size: 2.2rem;
  font-weight: 900;
  margin-bottom: 10px;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.home-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}

.home-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}

.home-tool-card {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--bg-glass-border);
  border-radius: var(--radius-lg);
  padding: 24px 20px;
  cursor: pointer;
  transition: all var(--t-normal) var(--ease-out);
  text-align: center;
}

.home-tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-light);
}

.home-tool-card:hover .home-tool-icon {
  transform: scale(1.1);
  color: var(--accent);
}

.home-tool-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  transition: all var(--t-normal) var(--ease-spring);
  color: var(--text-secondary);
}

.home-tool-name {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 4px;
}

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

/* ================================================================
   26. INLINE OPTION SECTIONS
   ================================================================ */
.option-group {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.option-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.option-row label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 120px;
}

.inline-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.chip-group {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.chip {
  padding: 5px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease-out);
}

.chip:hover {
  border-color: var(--accent-light);
  color: var(--accent);
}

.chip.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ================================================================
   27. ANIMATIONS & KEYFRAMES
   ================================================================ */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes panelIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

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

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  15% { transform: scale(1.25); }
  30% { transform: scale(1); }
  45% { transform: scale(1.15); }
  60% { transform: scale(1); }
}

@keyframes creatorGlow {
  0%, 100% { filter: brightness(1); }
  50% { filter: brightness(1.4); }
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(60px) scale(0.9); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(60px) scale(0.9); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes ambientShift {
  0% { opacity: 0.5; }
  50% { opacity: 0.8; }
  100% { opacity: 0.5; }
}

@keyframes borderGlow {
  0%, 100% { border-color: var(--accent-light); }
  50% { border-color: var(--accent); }
}

/* ================================================================
   28. CUSTOM SCROLLBAR
   ================================================================ */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-light);
}

/* ================================================================
   29. SIGNATURE PAD
   ================================================================ */
.signature-pad {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  background: #fff;
  cursor: crosshair;
  touch-action: none;
}

[data-theme="dark"] .signature-pad {
  background: var(--bg-elevated);
}

/* ================================================================
   30. UTILITY CLASSES
   ================================================================ */
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.p-3 { padding: 12px; }
.p-4 { padding: 16px; }
.w-full { width: 100%; }
.text-center { text-align: center; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.relative { position: relative; }
.overflow-hidden { overflow: hidden; }

/* ================================================================
   31. RESPONSIVE
   ================================================================ */
@media (max-width: 1200px) {
  .tool-body.two-col {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }

  .main-area {
    margin-left: 0;
  }

  .home-tools-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }

  .header-left .menu-toggle {
    display: flex;
  }
}

@media (max-width: 600px) {
  .main-content {
    padding: 16px;
  }

  .home-title {
    font-size: 1.6rem;
  }

  .thumbnail-grid {
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  }
}

.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: flex;
  }
}