/* ==========================================================================
   DailyKitBox — document-converter.css
   Mobile-first, Accessible (WCAG AA), Core Web Vitals Optimized
   ========================================================================== */

:root {
  --dc-primary: #2563EB;
  --dc-primary-dark: #1D4ED8;
  --dc-success: #16A34A;
  --dc-danger: #DC2626;
  --dc-warning: #F59E0B;
  --dc-bg: #F8FAFC;
  --dc-white: #FFFFFF;
  --dc-border: #E2E8F0;
  --dc-text: #1E293B;
  --dc-text-muted: #64748B;
  --dc-font: 'Inter', Arial, sans-serif;
  --dc-radius: 18px;
  --dc-radius-sm: 12px;
  --dc-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  --dc-shadow-lg: 0 20px 45px rgba(15, 23, 42, 0.14);
  --dc-transition: 0.3s ease;
  --dc-focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.35);
  --dc-glass-bg: rgba(255, 255, 255, 0.68);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

.dc-body {
  background: var(--dc-bg);
  color: var(--dc-text);
  font-family: var(--dc-font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
button, input, select { font: inherit; color: inherit; }
a { color: var(--dc-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.3; font-weight: 800; color: var(--dc-text); }
ol, ul { list-style: none; }

::selection { background: var(--dc-primary); color: #fff; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--dc-primary); outline-offset: 2px; box-shadow: var(--dc-focus-ring); border-radius: 4px; }

.dc-sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.dc-hidden { display: none !important; }

.dc-skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--dc-primary); color: #fff; padding: 12px 20px; z-index: 999;
}
.dc-skip-link:focus { left: 0; }

/* ==========================================================================
   LAYOUT
   ========================================================================== */
.dc-container { width: min(100%, 960px); margin: 0 auto; padding: 0 20px; }
.dc-main { padding: 20px 0 10px; }
.dc-card + .dc-card { margin-top: 20px; }
.dc-main .dc-card:first-child { margin-top: 0; }

/* ==========================================================================
   HEADER
   ========================================================================== */
.dc-header { background: linear-gradient(135deg, #0A192F, #1E293B); padding: 16px 0; }
.dc-header-inner { display: flex; align-items: center; justify-content: space-between; }
.dc-logo { display: flex; align-items: center; gap: 8px; font-weight: 800; color: #fff; font-size: 1.1rem; }
.dc-logo svg { color: #60A5FA; }
.dc-logo span span { color: #60A5FA; }

.dc-theme-toggle {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  width: 42px; height: 42px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background var(--dc-transition), transform var(--dc-transition);
}
.dc-theme-toggle:hover { background: rgba(255,255,255,0.2); transform: rotate(15deg); }
.dc-icon-moon { display: none; }
[data-theme="dark"] .dc-icon-sun { display: none; }
[data-theme="dark"] .dc-icon-moon { display: block; }

/* ==========================================================================
   HERO
   ========================================================================== */
.dc-hero { background: linear-gradient(135deg, #0A192F, #1E293B); color: #fff; padding: 40px 0 64px; text-align: center; }
.dc-eyebrow { display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.04em; color: #93C5FD; margin-bottom: 12px; }
.dc-title { font-size: clamp(1.8rem, 4.5vw, 2.6rem); color: #fff; margin-bottom: 20px; letter-spacing: -0.02em; }
.dc-subtitle { color: rgba(255,255,255,0.92); max-width: 620px; margin: 20px auto 0; font-size: 1rem; }

.dc-morph-wrap { display: flex; align-items: center; justify-content: center; gap: 16px; }
.dc-chip {
  width: 92px; height: 40px;
  border-radius: 10px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.dc-stack { display: flex; flex-direction: column; animation: dcMorph 8s steps(5) infinite; }
.dc-stack span { height: 40px; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 0.85rem; color: #fff; }
.dc-arrow { color: #60A5FA; }

/* ==========================================================================
   TABS
   ========================================================================== */
.dc-tabs {
  background: var(--dc-white);
  border-bottom: 1px solid var(--dc-border);
  position: sticky; top: 0; z-index: 50;
  box-shadow: var(--dc-shadow);
}
.dc-tabs-inner { display: flex; gap: 6px; overflow-x: auto; padding: 10px 20px; scrollbar-width: none; }
.dc-tabs-inner::-webkit-scrollbar { display: none; }
.dc-tab {
  background: transparent; border: none; padding: 12px 18px; border-radius: 999px;
  font-weight: 700; color: var(--dc-text-muted); white-space: nowrap; cursor: pointer;
  transition: background var(--dc-transition), color var(--dc-transition);
}
.dc-tab:hover { background: var(--dc-bg); color: var(--dc-text); }
.dc-tab.active { background: var(--dc-primary); color: #fff; }

.dc-panel { animation: dcFadeIn 0.35s ease both; }

/* ==========================================================================
   CARDS
   ========================================================================== */
.dc-card {
  background: var(--dc-glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: var(--dc-radius);
  box-shadow: var(--dc-shadow);
  padding: 26px;
  margin: 20px auto;
  max-width: 960px;
  animation: dcFadeIn 0.4s ease both;
  transition: box-shadow var(--dc-transition);
}
.dc-card:hover { box-shadow: var(--dc-shadow-lg); }
.dc-main .dc-card { margin: 0 0 20px; max-width: none; }
.dc-card-title { font-size: 1.3rem; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.dc-card-note { font-size: 0.88rem; color: var(--dc-text-muted); margin-bottom: 16px; }

/* ==========================================================================
   DROPZONE
   ========================================================================== */
.dc-dropzone {
  position: relative;
  border: 3px dashed var(--dc-primary);
  border-radius: var(--dc-radius);
  padding: 38px 20px;
  text-align: center;
  background: rgba(37,99,235,0.04);
  cursor: pointer;
  transition: background var(--dc-transition), transform var(--dc-transition);
}
.dc-dropzone:hover, .dc-dropzone:focus-visible { background: rgba(37,99,235,0.08); transform: translateY(-2px); }
.dc-dropzone.dragover { background: rgba(22,163,74,0.08); border-color: var(--dc-success); transform: scale(1.01); }
.dc-dropzone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.dc-dropzone-icon { color: var(--dc-primary); margin: 0 auto 12px; animation: dcFloat 3s ease-in-out infinite; width: fit-content; }
.dc-dropzone-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 6px; }
.dc-dropzone-sub { font-size: 0.82rem; color: var(--dc-text-muted); }

/* ==========================================================================
   QUEUE
   ========================================================================== */
.dc-queue { display: flex; flex-direction: column; gap: 10px; margin: 18px 0; }
.dc-queue-item {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: var(--dc-white); border: 1px solid var(--dc-border); border-radius: var(--dc-radius-sm);
  padding: 10px 14px; cursor: grab; animation: dcFadeIn 0.3s ease both;
  transition: border-color var(--dc-transition), opacity var(--dc-transition);
}
.dc-queue-item:active { cursor: grabbing; }
.dc-queue-item.dragging { opacity: 0.4; }
.dc-queue-item.drag-over { border-color: var(--dc-primary); }
.dc-queue-name { font-weight: 700; font-size: 0.9rem; flex: 1; min-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dc-queue-meta { font-size: 0.78rem; color: var(--dc-text-muted); }
.dc-queue-select { padding: 6px 10px; font-size: 0.82rem; border-radius: 8px; }
.dc-queue-remove {
  width: 30px; height: 30px; border-radius: 8px; border: 1px solid var(--dc-border);
  background: var(--dc-bg); color: var(--dc-text-muted); display: flex; align-items: center; justify-content: center; cursor: pointer;
}
.dc-queue-remove:hover { background: rgba(220,38,38,0.1); color: var(--dc-danger); }
.dc-queue-download { font-size: 0.8rem; padding: 6px 12px; }

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.dc-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.dc-btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 20px; border-radius: var(--dc-radius-sm); border: 1px solid var(--dc-border);
  background: var(--dc-white); font-weight: 700; cursor: pointer;
  transition: transform 0.15s ease, box-shadow var(--dc-transition), background var(--dc-transition);
  color: var(--dc-text);
}
.dc-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(15,23,42,0.1); }
.dc-btn:active { transform: scale(0.98); }
.dc-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.dc-btn-primary { background: var(--dc-primary); border-color: var(--dc-primary); color: #fff; }
.dc-btn-primary:hover { background: var(--dc-primary-dark); }

/* ==========================================================================
   OPTIONS
   ========================================================================== */
.dc-options-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.dc-field { display: flex; flex-direction: column; gap: 6px; }
.dc-field label { font-weight: 700; font-size: 0.85rem; }
input, select { padding: 11px 12px; border: 1px solid var(--dc-border); border-radius: var(--dc-radius-sm); background: var(--dc-white); width: 100%; transition: border-color var(--dc-transition); }
input:focus, select:focus { border-color: var(--dc-primary); box-shadow: var(--dc-focus-ring); }
.dc-checkbox { display: flex; align-items: center; gap: 8px; font-size: 0.88rem; font-weight: 600; }
.dc-checkbox input { width: auto; }

/* ==========================================================================
   BADGES
   ========================================================================== */
.dc-badge {
  display: inline-flex; align-items: center; padding: 3px 10px; border-radius: 999px;
  background: rgba(37,99,235,0.12); color: var(--dc-primary-dark); font-size: 0.72rem; font-weight: 800;
}
.dc-badge-pro { background: rgba(245,158,11,0.16); color: #B45309; }

/* ==========================================================================
   FORMAT GRID
   ========================================================================== */
.dc-format-grid { display: grid; grid-template-columns: 1fr; gap: 10px; }
.dc-format-option {
  display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
  padding: 14px 16px; border-radius: var(--dc-radius-sm); border: 1px solid var(--dc-border);
  background: var(--dc-white); cursor: pointer; text-align: left;
  transition: all var(--dc-transition);
}
.dc-format-option:hover { border-color: var(--dc-primary); transform: translateY(-2px); }
.dc-format-option.active { border-color: var(--dc-primary); background: rgba(37,99,235,0.06); }
.dc-format-option strong { font-size: 0.95rem; }
.dc-format-option span:not(.dc-badge-pro) { font-size: 0.78rem; color: var(--dc-text-muted); }

/* ==========================================================================
   FEATURES / BENEFITS
   ========================================================================== */
.dc-feature-grid, .dc-benefit-grid { display: grid; grid-template-columns: 1fr; gap: 14px; }
.dc-feature-card, .dc-benefit-card {
  background: var(--dc-bg); border: 1px solid var(--dc-border); border-radius: var(--dc-radius-sm);
  padding: 16px; transition: transform var(--dc-transition);
}
.dc-feature-card:hover, .dc-benefit-card:hover { transform: translateY(-3px); }
.dc-feature-card h3, .dc-benefit-card h3 { font-size: 1rem; margin-bottom: 6px; }
.dc-feature-card p, .dc-benefit-card p { font-size: 0.85rem; color: var(--dc-text-muted); font-weight: 400; }

/* ==========================================================================
   HOW TO
   ========================================================================== */
.dc-howto-list { padding-left: 4px; display: flex; flex-direction: column; gap: 12px; counter-reset: step; }
.dc-howto-list li { padding-left: 34px; position: relative; font-size: 0.95rem; counter-increment: step; }
.dc-howto-list li::before {
  content: counter(step); position: absolute; left: 0; top: -2px;
  width: 24px; height: 24px; background: var(--dc-primary); color: #fff; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-size: 0.78rem; font-weight: 800;
}

/* ==========================================================================
   RELATED / FAQ / CTA
   ========================================================================== */
.dc-related-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.dc-related-link {
  background: var(--dc-bg); border: 1px solid var(--dc-border); border-radius: var(--dc-radius-sm);
  padding: 14px 10px; font-weight: 700; text-align: center; font-size: 0.85rem; color: var(--dc-text);
  transition: all var(--dc-transition);
}
.dc-related-link:hover { border-color: var(--dc-primary); color: var(--dc-primary); text-decoration: none; transform: translateY(-2px); }

.dc-faq-item { padding: 16px 0; border-bottom: 1px solid var(--dc-border); }
.dc-faq-item:last-child { border-bottom: none; }
.dc-faq-item h3 { font-size: 1.02rem; margin-bottom: 6px; }
.dc-faq-item p { color: var(--dc-text-muted); font-size: 0.92rem; }

.dc-cta-card { text-align: center; background: linear-gradient(135deg, var(--dc-primary), var(--dc-primary-dark)); }
.dc-cta-card .dc-card-title, .dc-cta-card .dc-card-note { color: #fff; }
.dc-cta-card .dc-btn-primary { background: #fff; color: var(--dc-primary); border-color: #fff; }
.dc-cta-card .dc-btn-primary:hover { background: #F1F5F9; }

/* ==========================================================================
   FOOTER / TOAST
   ========================================================================== */
.dc-footer { background: #0A192F; color: rgba(255,255,255,0.85); text-align: center; padding: 26px 20px; font-size: 0.82rem; margin-top: 10px; }

#toastContainer { position: fixed; bottom: 20px; right: 20px; display: flex; flex-direction: column; gap: 10px; z-index: 1000; max-width: 320px; }
.dc-toast {
  background: var(--dc-white); border: 1px solid var(--dc-border); border-left: 4px solid var(--dc-primary);
  border-radius: 10px; padding: 12px 16px; box-shadow: var(--dc-shadow-lg); font-size: 0.88rem;
  animation: dcSlideIn 0.3s ease both;
}
.dc-toast.dc-toast-success { border-left-color: var(--dc-success); }
.dc-toast.dc-toast-error { border-left-color: var(--dc-danger); }
.dc-toast.dc-toast-fadeout { animation: dcFadeOut 0.3s ease forwards; }

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */
@keyframes dcFadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes dcFloat { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes dcSlideIn { from { opacity: 0; transform: translateX(30px); } to { opacity: 1; transform: translateX(0); } }
@keyframes dcFadeOut { from { opacity: 1; } to { opacity: 0; transform: translateX(30px); } }
@keyframes dcMorph {
  0%, 15% { transform: translateY(0); }
  20%, 35% { transform: translateY(-40px); }
  40%, 55% { transform: translateY(-80px); }
  60%, 75% { transform: translateY(-120px); }
  80%, 95% { transform: translateY(-160px); }
  100% { transform: translateY(0); }
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (min-width: 560px) { .dc-format-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 640px) {
  .dc-options-grid { grid-template-columns: repeat(2, 1fr); }
  .dc-feature-grid, .dc-benefit-grid { grid-template-columns: repeat(2, 1fr); }
  .dc-related-grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 768px) { .dc-format-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 900px) {
  .dc-options-grid { grid-template-columns: repeat(4, 1fr); }
  .dc-feature-grid, .dc-benefit-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 479px) {
  .dc-card { padding: 18px; }
  .dc-btn { flex: 1 1 45%; }
  .dc-morph-wrap { transform: scale(0.85); }
}

/* ==========================================================================
   DARK MODE
   ========================================================================== */
[data-theme="dark"] {
  --dc-bg: #0B1220;
  --dc-white: #111C2E;
  --dc-border: #263348;
  --dc-text: #E2E8F0;
  --dc-text-muted: #94A3B8;
  --dc-glass-bg: rgba(17, 28, 46, 0.72);
  --dc-shadow: 0 10px 30px rgba(0,0,0,0.5);
  --dc-shadow-lg: 0 20px 45px rgba(0,0,0,0.6);
}
[data-theme="dark"] h1, [data-theme="dark"] h2, [data-theme="dark"] h3 { color: #F1F5F9; }
[data-theme="dark"] .dc-card { border-color: rgba(255,255,255,0.08); }
[data-theme="dark"] input, [data-theme="dark"] select { background: #0F1B2E; border-color: var(--dc-border); color: var(--dc-text); }
[data-theme="dark"] .dc-btn, [data-theme="dark"] .dc-queue-item, [data-theme="dark"] .dc-format-option,
[data-theme="dark"] .dc-feature-card, [data-theme="dark"] .dc-benefit-card, [data-theme="dark"] .dc-related-link,
[data-theme="dark"] .dc-toast, [data-theme="dark"] .dc-queue-remove {
  background: #0F1B2E; color: #F1F5F9; border-color: var(--dc-border);
}
[data-theme="dark"] .dc-tabs { background: #0F1B2E; border-color: var(--dc-border); }
[data-theme="dark"] .dc-tab { color: var(--dc-text-muted); }
[data-theme="dark"] .dc-tab:hover { background: #16233A; color: #F1F5F9; }
[data-theme="dark"] .dc-dropzone { background: rgba(37,99,235,0.08); }
[data-theme="dark"] .dc-format-option.active { background: rgba(37,99,235,0.15); }

/* ==========================================================================
   PRINT
   ========================================================================== */
@media print {
  .dc-header, .dc-footer, .dc-actions, .dc-theme-toggle, .dc-dropzone, .dc-tabs, #toastContainer { display: none !important; }
}