/* ==========================================================================
   PDFMaster - PDF Blank Page Inserter Stylesheet
   Clean & Minimal · Strict Brand Palette (#e8372a) · Low-RAM Architecture
   ========================================================================== */

/* ===== DESIGN TOKENS ===== */
:root {
  --accent: #e8372a;
  --accent-dark: #c42d21;
  --accent-light: rgba(232, 55, 42, 0.08);
  --accent-glow: rgba(232, 55, 42, 0.25);

  --blank-blue: #3b82f6;
  --blank-blue-dark: #2563eb;
  --blank-blue-bg: rgba(59, 130, 246, 0.08);
  --blank-blue-border: rgba(59, 130, 246, 0.35);

  --success-green: #10b981;
  --success-green-dark: #059669;
  --success-bg: rgba(16, 185, 129, 0.1);

  --delete-red: #ef4444;
  --delete-red-dark: #dc2626;
  --delete-bg: rgba(239, 68, 68, 0.08);

  --font-heading: "Sora", sans-serif;
  --font-body: "DM Sans", sans-serif;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
  --transition: 0.2s ease;
  --max-w: 1240px;
  --nav-h: 68px;
}

[data-theme="light"] {
  --bg: #f8f7f5;
  --surface: #ffffff;
  --surface-2: #f2f1ef;
  --surface-3: #eae9e6;
  --border: #e4e2de;
  --border-focus: #c8c5be;
  --text: #1a1917;
  --text-2: #4a4845;
  --text-3: #7a7875;
  --nav-bg: rgba(248, 247, 245, 0.94);
  --card-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.09);
  --modal-overlay: rgba(15, 15, 15, 0.65);
  --badge-bg: #f1f0ee;
  --thumb-bg: #ffffff;
  --blank-card-bg: #fbfbfa;
}

[data-theme="dark"] {
  --bg: #111110;
  --surface: #1c1b1a;
  --surface-2: #252422;
  --surface-3: #2e2c2a;
  --border: #333230;
  --border-focus: #4a4845;
  --text: #f0ede8;
  --text-2: #b5b0a8;
  --text-3: #7a7875;
  --nav-bg: rgba(17, 17, 16, 0.94);
  --card-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
  --card-hover-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  --modal-overlay: rgba(0, 0, 0, 0.82);
  --badge-bg: #272523;
  --thumb-bg: #181716;
  --blank-card-bg: #191817;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  transition:
    background var(--transition),
    color var(--transition);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

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

button {
  cursor: pointer;
  font-family: var(--font-body);
  border: none;
  background: none;
}

ol,
ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ===== NAVBAR ===== */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-h);
  background: var(--nav-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  transition:
    background var(--transition),
    border-color var(--transition);
}

.site-header nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.nav-logo img {
  width: 36px;
  height: 36px;
  border-radius: 9px;
  object-fit: contain;
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

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

/* Header Buttons */
.theme-toggle,
.recovery-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition:
    background 0.3s,
    border-color 0.3s,
    transform 0.2s,
    color 0.2s;
  color: var(--text-2);
  flex-shrink: 0;
  cursor: pointer;
}

.theme-toggle:hover,
.recovery-btn:hover {
  background: rgba(232, 55, 42, 0.07);
  border-color: rgba(232, 55, 42, 0.18);
  color: var(--accent);
  transform: scale(1.08);
}

.theme-toggle svg,
.recovery-btn svg {
  width: 18px;
  height: 18px;
  pointer-events: none;
}

.recovery-badge {
  position: absolute;
  top: 7px;
  right: 7px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  animation: pulse-badge 2s infinite ease-in-out;
}

@keyframes pulse-badge {
  0% {
    transform: scale(0.9);
    box-shadow: 0 0 0 0 rgba(232, 55, 42, 0.6);
  }
  70% {
    transform: scale(1.1);
    box-shadow: 0 0 0 6px rgba(232, 55, 42, 0);
  }
  100% {
    transform: scale(0.9);
    box-shadow: 0 0 0 0 rgba(232, 55, 42, 0);
  }
}

.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  padding: 0;
  gap: 5px;
  transition:
    background 0.2s,
    border-color 0.2s;
}

.hamburger-btn:hover {
  background: var(--surface-2);
  border-color: var(--border-focus);
}

.h-bar {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition:
    transform 0.25s,
    opacity 0.25s;
}

/* ===== SIDE MENU (MOBILE) ===== */
.side-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.3s,
    visibility 0.3s;
}

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

.side-menu {
  position: fixed;
  top: 0;
  right: -320px;
  width: min(300px, 85vw);
  height: 100%;
  background: var(--surface);
  border-left: 1px solid var(--border);
  z-index: 1200;
  padding: 24px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
}

.side-menu.active {
  right: 0;
}

.side-menu-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.side-menu-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.close-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-2);
  transition: all var(--transition);
}

.close-btn:hover {
  background: var(--surface-2);
  color: var(--text);
}

.side-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.side-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
}

.side-nav a:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.side-divider {
  height: 1px;
  background: var(--border);
  margin: 12px 0;
}

/* ===== BREADCRUMB ===== */
.breadcrumb {
  padding: 14px 0;
  font-size: 0.85rem;
  color: var(--text-3);
  border-bottom: 1px solid var(--border);
}

.breadcrumb__list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb__item a {
  color: var(--text-2);
  transition: color var(--transition);
}

.breadcrumb__item a:hover {
  color: var(--accent);
}

.breadcrumb__sep {
  color: var(--text-3);
  user-select: none;
}

/* ===== HERO SECTION ===== */
.hero {
  padding: 56px 0 32px;
  text-align: center;
}

.hero__inner {
  max-width: 820px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 18px;
  border: 1px solid rgba(232, 55, 42, 0.18);
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: var(--text);
}

.hero__title .accent {
  color: var(--accent);
  background: linear-gradient(135deg, var(--accent) 0%, #ff6b4a 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__sub {
  font-size: 1.1rem;
  color: var(--text-2);
  margin-bottom: 24px;
  line-height: 1.6;
}

.hero__badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
}

.pill svg {
  color: var(--accent);
}

/* ===== TOOL SECTION ===== */
.tool-section {
  padding: 16px 0 54px;
}

/* ===== UPLOAD ZONE ===== */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 60px 24px;
  text-align: center;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition:
    border-color var(--transition),
    background var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
  position: relative;
  outline: none;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--surface-2);
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(232, 55, 42, 0.08);
}

.upload-zone:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.upload-zone__icon {
  width: 68px;
  height: 68px;
  margin: 0 auto 20px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
}

.upload-zone:hover .upload-zone__icon {
  transform: scale(1.1) rotate(5deg);
}

.upload-zone__title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.upload-zone__sub {
  color: var(--text-3);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.upload-zone__formats {
  margin-top: 18px;
  font-size: 0.82rem;
  color: var(--text-3);
}

/* Common Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--accent);
  color: #fff;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.96rem;
  box-shadow: 0 4px 14px rgba(232, 55, 42, 0.3);
  transition:
    background var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
}

.btn-primary:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(232, 55, 42, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--surface-2);
  color: var(--text-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.86rem;
  transition:
    background var(--transition),
    color var(--transition),
    border-color var(--transition);
}

.btn-secondary:hover {
  background: var(--surface-3);
  color: var(--text);
  border-color: var(--text-3);
}

.btn-xs {
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.btn-xs:hover {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--text-3);
}

.btn-xs.active {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

#fileInput {
  display: none;
}

/* ===== WORKSPACE ===== */
.workspace {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}

.workspace.active {
  display: block;
}

/* File Info Bar */
.file-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding: 16px 20px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.file-info-bar__left {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.file-info-bar__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.file-info-bar__meta {
  min-width: 0;
}

.file-info-bar__name {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 450px;
}

.file-info-bar__size {
  font-size: 0.85rem;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 2px;
}

.badge-ram {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(59, 130, 246, 0.12);
  color: #2563eb;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  border: 1px solid rgba(59, 130, 246, 0.25);
}

[data-theme="dark"] .badge-ram {
  color: #60a5fa;
}

.file-info-bar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* Control Panel & Quick Inserter Toolbar */
.inserter-controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 20px;
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
}

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

.control-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 5px;
}

.select-control {
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 500;
  font-family: var(--font-body);
  outline: none;
  transition: border-color var(--transition);
  cursor: pointer;
}

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

.num-input {
  width: 60px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  outline: none;
  font-family: var(--font-body);
}

.num-input:focus {
  border-color: var(--accent);
}

.history-btns {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  transition: all var(--transition);
}

.btn-icon:hover:not(:disabled) {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--text-3);
}

.btn-icon:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Sizing toggle */
.grid-size-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--surface-2);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.grid-size-btn {
  padding: 4px 9px;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 4px;
  color: var(--text-3);
  transition: all var(--transition);
}

.grid-size-btn.active {
  background: var(--surface);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

/* Summary Banner */
.summary-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  background: var(--surface-2);
}

.summary-banner.has-blank {
  background: var(--blank-blue-bg);
  border-color: var(--blank-blue-border);
}

.summary-text strong {
  font-weight: 700;
}

.summary-badge-blank {
  color: var(--blank-blue-dark);
  font-weight: 700;
}

[data-theme="dark"] .summary-badge-blank {
  color: #60a5fa;
}

.summary-badge-total {
  color: var(--accent);
  font-weight: 700;
}

/* ===== PAGES GRID & INTERACTION ===== */
.pages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 20px;
  margin-bottom: 28px;
}

.pages-grid.grid-sm {
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 14px;
}

.pages-grid.grid-lg {
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 24px;
}

/* Insertion Slot Divider Card */
.insertion-slot {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 8px 0;
  margin: -8px 0;
  z-index: 5;
}

.insertion-slot::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: var(--border);
  transition:
    background var(--transition),
    transform var(--transition);
}

.insertion-slot:hover::before {
  background: var(--accent);
  transform: scaleY(1.5);
}

.insertion-slot-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: var(--surface);
  border: 1px dashed var(--border);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  cursor: pointer;
}

.insertion-slot-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: scale(1.05);
  box-shadow: 0 4px 14px rgba(232, 55, 42, 0.3);
}

.insertion-slot-btn svg {
  width: 13px;
  height: 13px;
}

/* Page Card Common */
.page-card {
  position: relative;
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition:
    transform 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease;
  display: flex;
  flex-direction: column;
  user-select: none;
}

.page-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--card-hover-shadow);
  border-color: var(--border-focus);
}

.page-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
}

.page-card__num {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.page-card__now {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: var(--surface-3);
  color: var(--text-2);
  white-space: nowrap;
  letter-spacing: 0.01em;
}

.page-card__now.is-shifted {
  background: rgba(232, 55, 42, 0.12);
  color: var(--accent);
  border: 1px solid rgba(232, 55, 42, 0.25);
  font-weight: 700;
}

[data-theme="dark"] .page-card__now.is-shifted {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border-color: rgba(239, 68, 68, 0.35);
}

.page-card__now.is-blank-now {
  background: rgba(59, 130, 246, 0.14);
  color: #2563eb;
  border: 1px solid rgba(59, 130, 246, 0.25);
  font-weight: 700;
}

[data-theme="dark"] .page-card__now.is-blank-now {
  background: rgba(59, 130, 246, 0.22);
  color: #93c5fd;
  border-color: rgba(59, 130, 246, 0.35);
}

.page-card__actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.page-card__btn {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--text-3);
  transition: all var(--transition);
}

.page-card__btn:hover {
  background: var(--surface-3);
  color: var(--accent);
}

.page-card__body {
  position: relative;
  aspect-ratio: 1 / 1.414;
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  cursor: pointer;
}

.page-canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.page-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
}

.page-loading-spinner {
  width: 24px;
  height: 24px;
  border: 2.5px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.page-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: var(--surface-2);
  border-top: 1px solid var(--border);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-3);
}

.page-card__quick-add {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-card-add {
  padding: 3px 6px;
  font-size: 0.72rem;
  border-radius: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-weight: 600;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 3px;
}

.btn-card-add:hover {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

/* Blank Page Card Unique Styling */
.page-card--blank {
  border: 2px dashed var(--blank-blue-dark);
  background: var(--blank-card-bg);
}

.page-card--blank:hover {
  border-color: var(--blank-blue);
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.15);
}

.page-card--blank .page-card__head {
  background: var(--blank-blue-bg);
  border-bottom-color: var(--blank-blue-border);
  color: var(--blank-blue-dark);
}

[data-theme="dark"] .page-card--blank .page-card__head {
  color: #60a5fa;
}

.page-card--blank .page-card__body {
  background: #ffffff;
}

/* Blank Page Visual Templates */
.blank-preview-stage {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px;
}

/* Plain Blank */
.blank-preview-plain {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  color: #94a3b8;
}

.blank-watermark-icon {
  width: 36px;
  height: 36px;
  opacity: 0.45;
}

.blank-watermark-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #94a3b8;
}

/* Lined Notes Paper Preview */
.blank-preview-lined {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, transparent 20px, #fca5a5 20px, #fca5a5 22px, transparent 22px),
    linear-gradient(to bottom, transparent 22px, #e2e8f0 22px, #e2e8f0 23px);
  background-size: 100% 23px;
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blank-preview-lined .blank-watermark-label {
  background: rgba(255, 255, 255, 0.9);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
}

/* Dot Grid Paper Preview */
.blank-preview-dotgrid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(#94a3b8 1px, transparent 1px);
  background-size: 12px 12px;
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blank-preview-dotgrid .blank-watermark-label {
  background: rgba(255, 255, 255, 0.9);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
}

/* Graph Paper Preview */
.blank-preview-graph {
  position: absolute;
  inset: 0;
  background-size: 12px 12px;
  background-image:
    linear-gradient(to right, #e2e8f0 1px, transparent 1px),
    linear-gradient(to bottom, #e2e8f0 1px, transparent 1px);
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.blank-preview-graph .blank-watermark-label {
  background: rgba(255, 255, 255, 0.9);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid #e2e8f0;
}

/* Inline Blank Card Controls */
.blank-card-controls {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 8px 10px;
  background: var(--surface-2);
  border-top: 1px solid var(--border);
}

.blank-card-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
}

.blank-select {
  flex: 1;
  padding: 4px 6px;
  font-size: 0.72rem;
  font-weight: 600;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-body);
  outline: none;
}

.btn-card-del {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--delete-red);
  background: transparent;
  transition: all var(--transition);
}

.btn-card-del:hover {
  background: var(--delete-bg);
  color: var(--delete-red-dark);
}

.btn-card-clone {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  color: var(--blank-blue);
  background: transparent;
  transition: all var(--transition);
}

.btn-card-clone:hover {
  background: var(--blank-blue-bg);
  color: var(--blank-blue-dark);
}

/* ===== STICKY ACTION BAR ===== */
.sticky-action-bar {
  position: sticky;
  bottom: 24px;
  margin-top: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 100;
  gap: 16px;
  flex-wrap: wrap;
}

.action-bar-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.action-bar-stats {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.action-bar-stats span {
  color: var(--accent);
}

/* ===== MODALS ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--modal-overlay);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.25s,
    visibility 0.25s;
}

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

.modal-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: min(650px, 94vw);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modal-pop 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-pop {
  from {
    transform: scale(0.95) translateY(10px);
  }
  to {
    transform: scale(1) translateY(0);
  }
}

.modal-head {
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}

.modal-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}

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

.modal-foot {
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

/* Loading Progress Modal */
.progress-box {
  text-align: center;
  padding: 10px 0;
}

.progress-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  animation: pulse-icon 1.5s infinite;
}

@keyframes pulse-icon {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.08);
  }
}

.progress-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.progress-sub {
  font-size: 0.9rem;
  color: var(--text-3);
  margin-bottom: 22px;
}

.progress-bar-wrap {
  width: 100%;
  height: 8px;
  background: var(--surface-3);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 12px;
}

.progress-bar-fill {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, #ff6b4a 100%);
  border-radius: var(--radius-full);
  transition: width 0.2s ease;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-2);
  font-weight: 500;
}

/* Results Card / Success Modal */
.results-card {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  margin-top: 24px;
  box-shadow: var(--shadow);
}

.results-card.active {
  display: block;
}

.results-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--success-bg);
  color: var(--success-green);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.results-title {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.results-sub {
  color: var(--text-3);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.results-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  max-width: 500px;
  margin: 0 auto 28px;
}

.results-stat {
  padding: 12px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.results-stat-num {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  margin-bottom: 2px;
}

.results-stat-lbl {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.results-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* Inspector Modal */
.inspect-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 380px;
}

.inspect-canvas-wrapper {
  max-width: 100%;
  max-height: 65vh;
  box-shadow: var(--shadow);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #ffffff;
}

.inspect-canvas {
  max-width: 100%;
  max-height: 65vh;
  display: block;
}

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(40px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 3000;
  pointer-events: none;
}

.toast.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

/* ===== CONTENT SECTIONS (SEO) ===== */
.content-section {
  padding: 60px 0;
  border-top: 1px solid var(--border);
}

.sec-head {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 44px;
}

.sec-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius-full);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.sec-head h2 {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 800;
  color: var(--text);
  margin-bottom: 12px;
  line-height: 1.25;
}

.sec-head p {
  color: var(--text-2);
  font-size: 1.05rem;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: var(--card-shadow);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--card-hover-shadow);
  border-color: var(--border-focus);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.feature-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.92rem;
  color: var(--text-2);
  line-height: 1.6;
}

/* How to Steps */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.step-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px 24px;
  box-shadow: var(--card-shadow);
}

.step-number {
  position: absolute;
  top: -14px;
  left: 24px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(232, 55, 42, 0.35);
}

.step-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.step-card p {
  font-size: 0.9rem;
  color: var(--text-2);
  line-height: 1.55;
}

/* Use Cases */
.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 22px;
}

.use-case-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.use-case-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.use-case-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text);
}

.use-case-card p {
  font-size: 0.88rem;
  color: var(--text-2);
  line-height: 1.55;
}

/* Comparison Table */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.92rem;
}

.comp-table th,
.comp-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.comp-table th {
  background: var(--surface-2);
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--text);
}

.comp-table th:first-child {
  width: 40%;
}

.comp-highlight {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 700;
}

th.comp-highlight {
  color: var(--text);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

th.comp-highlight span {
  color: var(--accent);
}

/* FAQ Accordion */
.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item:hover {
  border-color: var(--border-focus);
}

.faq-btn {
  width: 100%;
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-family: var(--font-heading);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text);
  gap: 14px;
}

.faq-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.25s ease;
  color: var(--text-3);
}

.faq-item.active .faq-icon {
  transform: rotate(180deg);
  color: var(--accent);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
  padding: 0 22px;
}

.faq-item.active .faq-content {
  max-height: 500px;
  padding-bottom: 18px;
}

.faq-content p {
  color: var(--text-2);
  font-size: 0.94rem;
  line-height: 1.65;
}

/* Related Tools Mini Grid */
.tools-mini-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.tool-card-mini {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.tool-card-mini:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.tool-card-mini__icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: var(--accent-light);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tool-card-mini h4 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 2px;
}

.tool-card-mini p {
  font-size: 0.8rem;
  color: var(--text-3);
}

/* ===== FOOTER ===== */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
  margin-top: 40px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer__brand p {
  margin: 16px 0 20px;
  color: var(--text-3);
  font-size: 0.92rem;
  max-width: 320px;
  line-height: 1.6;
}

.footer__socials {
  display: flex;
  gap: 12px;
}

.footer__social-link {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-2);
  transition: all var(--transition);
}

.footer__social-link:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.footer__col h4 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text);
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__col a {
  color: var(--text-3);
  font-size: 0.88rem;
  transition: color var(--transition);
}

.footer__col a:hover {
  color: var(--accent);
}

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 28px;
  border-top: 1px solid var(--border);
}

.footer__copy {
  font-size: 0.85rem;
  color: var(--text-3);
}

.footer__copy a {
  color: var(--text);
  font-weight: 600;
}

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

.footer__badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  border: 1px solid var(--border);
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-2);
}

.footer__badge svg {
  color: var(--accent);
}

/* Back to Top Button */
.back-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
  cursor: pointer;
}

.back-top.active {
  opacity: 1;
  visibility: visible;
}

.back-top:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ===== RESPONSIVE BREAKPOINTS ===== */
@media (max-width: 992px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 40px 0 24px;
  }

  .upload-zone {
    padding: 40px 18px;
  }

  .control-row {
    flex-direction: column;
    align-items: stretch;
  }

  .sticky-action-bar {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }

  .action-bar-info {
    justify-content: center;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}