/* ════════════════════════════════════════════════
   PDF Merger — Stylesheet
   ════════════════════════════════════════════════ */

/* ════════════════════════════════════════════════
   TOP BAR DONASI
   ════════════════════════════════════════════════ */
.topbar-donate {
  background: linear-gradient(90deg, #1d4ed8 0%, #0891b2 100%);
  color: #fff;
  padding: 10px 16px;
  font-size: 13.5px;
  position: sticky; top: 0; z-index: 999;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
.topbar-inner {
  max-width: 860px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px;
}
.topbar-left {
  display: flex; align-items: center; gap: 8px;
}
.topbar-heart {
  color: #fb7185;
  animation: heartbeat 1.4s ease-in-out infinite;
}
@keyframes heartbeat {
  0%,100% { transform: scale(1); }
  14%      { transform: scale(1.25); }
  28%      { transform: scale(1); }
  42%      { transform: scale(1.15); }
}
.topbar-dana {
  display: flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.15);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 99px;
  padding: 5px 14px 5px 10px;
  backdrop-filter: blur(4px);
}
.topbar-number {
  font-size: 14px; font-weight: 800;
  letter-spacing: .5px;
}
.topbar-copy {
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  padding: 3px 7px;
  font-size: 12px;
  transition: var(--transition);
  line-height: 1;
  position: relative;
}
.topbar-copy:hover { background: rgba(255,255,255,.35); }
.topbar-copied {
  font-size: 11.5px; font-weight: 600;
  color: #6ee7b7;
  opacity: 0;
  transition: opacity .25s;
  pointer-events: none;
}
.topbar-copied.show { opacity: 1; }

@media (max-width: 540px) {
  .topbar-inner { justify-content: center; }
  .topbar-left  { font-size: 12.5px; }
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:       #2563eb;
  --blue-dark:  #1d4ed8;
  --blue-light: #eff6ff;
  --green:      #16a34a;
  --green-bg:   #f0fdf4;
  --red:        #dc2626;
  --red-bg:     #fef2f2;
  --gray-50:    #f8fafc;
  --gray-100:   #f1f5f9;
  --gray-200:   #e2e8f0;
  --gray-400:   #94a3b8;
  --gray-600:   #475569;
  --gray-800:   #1e293b;
  --radius:     14px;
  --shadow:     0 4px 24px rgba(0,0,0,.08);
  --shadow-lg:  0 8px 40px rgba(0,0,0,.12);
  --transition: .22s ease;
  --dana-blue:  #118EEA;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: #f0f4ff;
  color: var(--gray-800);
  min-height: 100vh;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #1e40af 0%, #2563eb 50%, #06b6d4 100%);
  color: #fff;
  padding: 56px 24px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.hero-inner { position: relative; z-index: 1; max-width: 600px; margin: 0 auto; }
.hero-icon {
  width: 72px; height: 72px; border-radius: 20px;
  background: rgba(255,255,255,.2);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px;
  font-size: 32px;
  backdrop-filter: blur(8px);
}
.hero h1 { font-size: clamp(28px, 5vw, 44px); font-weight: 800; letter-spacing: -1px; }
.hero-sub { margin-top: 12px; font-size: 16px; opacity: .88; line-height: 1.6; }

/* ── Container ── */
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 16px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ── Card ── */
.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  position: relative;
}

.step-badge {
  position: absolute; top: -14px; left: 28px;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: 13px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 2px 8px rgba(37,99,235,.35);
}

.card h2 {
  font-size: 18px; font-weight: 700;
  margin-bottom: 6px;
  display: flex; align-items: center; gap: 8px;
  color: var(--gray-800);
}
.card h2 i { color: var(--blue); }

.hint { font-size: 13.5px; color: var(--gray-600); margin-bottom: 20px; line-height: 1.5; }

/* ── Dropzone ── */
.dropzone {
  border: 2.5px dashed var(--gray-200);
  border-radius: var(--radius);
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  background: var(--gray-50);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.dropzone:hover, .dropzone.dragover {
  border-color: var(--blue);
  background: var(--blue-light);
}
.dropzone.uploading {
  pointer-events: none;
  opacity: .7;
}
.drop-icon { font-size: 44px; color: var(--blue); margin-bottom: 4px; }
.dropzone p { font-size: 15px; color: var(--gray-600); }
.dropzone span { font-size: 13px; color: var(--gray-400); }

/* ── Progress ── */
.upload-progress { margin-top: 16px; display: flex; align-items: center; gap: 12px; }
.progress-bar {
  flex: 1; height: 8px; background: var(--gray-200);
  border-radius: 99px; overflow: hidden;
}
.progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--blue), #06b6d4);
  border-radius: 99px;
  transition: width .3s ease;
}
#progress-text { font-size: 13px; color: var(--gray-600); white-space: nowrap; }

/* ── File List ── */
.file-list {
  list-style: none;
  display: flex; flex-direction: column; gap: 8px;
  margin-bottom: 16px;
}
.file-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 14px;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: 10px;
  cursor: grab;
  transition: var(--transition);
  user-select: none;
}
.file-item:active { cursor: grabbing; }
.file-item.sortable-chosen { box-shadow: 0 4px 16px rgba(0,0,0,.12); transform: scale(1.01); }
.file-item.sortable-ghost { opacity: .4; }

.drag-handle { color: var(--gray-400); font-size: 16px; flex-shrink: 0; }
.file-icon { font-size: 22px; flex-shrink: 0; }
.file-icon.pdf   { color: #e74c3c; }
.file-icon.image { color: #f59e0b; }

.file-info { flex: 1; min-width: 0; }
.file-name {
  font-size: 14px; font-weight: 600; color: var(--gray-800);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.file-type { font-size: 11.5px; color: var(--gray-400); margin-top: 2px; text-transform: uppercase; }

.file-num {
  font-size: 12px; color: var(--gray-400);
  background: var(--gray-100); border-radius: 6px;
  padding: 2px 8px; flex-shrink: 0;
}
.btn-remove {
  background: none; border: none; cursor: pointer;
  color: var(--gray-400); font-size: 15px;
  padding: 4px 6px; border-radius: 6px;
  transition: var(--transition); flex-shrink: 0;
}
.btn-remove:hover { color: var(--red); background: var(--red-bg); }

/* ── Add more ── */
.add-more-row { display: flex; align-items: center; margin-top: 4px; }

/* ── Output name ── */
.output-row {
  display: flex; align-items: center; gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.output-row label { font-size: 14px; color: var(--gray-600); display: flex; align-items: center; gap: 6px; }
.output-row input {
  flex: 1; min-width: 180px;
  padding: 9px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: 8px;
  font-size: 14px; color: var(--gray-800);
  outline: none; transition: var(--transition);
}
.output-row input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.ext-label { font-size: 14px; color: var(--gray-400); font-weight: 600; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 20px;
  border-radius: 9px;
  font-size: 14px; font-weight: 600;
  cursor: pointer; border: none;
  text-decoration: none;
  transition: var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #fff;
  box-shadow: 0 4px 12px rgba(37,99,235,.3);
}
.btn-primary:hover { background: linear-gradient(135deg, #1d4ed8, #1e40af); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: .6; cursor: not-allowed; transform: none; }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: 12px; width: 100%; justify-content: center; }
.btn-outline {
  background: #fff; color: var(--blue);
  border: 2px solid var(--blue);
}
.btn-outline:hover { background: var(--blue-light); }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-success {
  background: linear-gradient(135deg, #16a34a, #15803d);
  color: #fff;
  box-shadow: 0 4px 12px rgba(22,163,74,.25);
}
.btn-success:hover { background: linear-gradient(135deg, #15803d, #166534); transform: translateY(-1px); }
.btn-ghost {
  background: var(--gray-100); color: var(--gray-600);
  border: 1.5px solid var(--gray-200);
}
.btn-ghost:hover { background: var(--gray-200); }

/* ── Result box ── */
.result-box {
  margin-top: 20px;
  background: var(--green-bg);
  border: 1.5px solid #bbf7d0;
  border-radius: 12px;
  padding: 20px;
  display: flex; align-items: center; gap: 16px;
  flex-wrap: wrap;
}
.result-icon { font-size: 36px; color: var(--green); flex-shrink: 0; }
.result-info { flex: 1; min-width: 0; }
.result-title { font-size: 16px; font-weight: 700; color: var(--green); }
.result-desc { font-size: 13.5px; color: var(--gray-600); margin-top: 4px; }

/* ── Log box ── */
.log-box {
  margin-top: 16px;
  background: #1e293b;
  border-radius: 10px;
  padding: 16px 20px;
  font-family: 'Consolas', 'Fira Code', monospace;
}
.log-title { font-size: 12px; color: #64748b; margin-bottom: 10px; display: flex; align-items: center; gap: 6px; }
.log-list { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.log-list li { font-size: 12.5px; display: flex; align-items: center; gap: 8px; }
.log-list .log-ok    { color: #4ade80; }
.log-list .log-err   { color: #f87171; }
.log-list .log-name  { color: #e2e8f0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.log-list .log-pages { color: #94a3b8; font-size: 11px; flex-shrink: 0; }

/* ── Error box ── */
.error-box {
  margin-top: 16px;
  background: var(--red-bg);
  border: 1.5px solid #fecaca;
  border-radius: 10px;
  padding: 14px 18px;
  display: flex; align-items: center; gap: 10px;
  color: var(--red); font-size: 14px;
}

/* ── Reset row ── */
.reset-row { display: flex; justify-content: center; }

/* ════════════════════════════════════════════════
   DONATE SECTION
   ════════════════════════════════════════════════ */
.donate-section {
  background: linear-gradient(180deg, #f0f4ff 0%, #e8f4fd 100%);
  padding: 56px 16px;
}
.donate-card {
  max-width: 520px;
  margin: 0 auto;
  background: #fff;
  border-radius: 20px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.donate-header {
  background: linear-gradient(135deg, var(--dana-blue) 0%, #0a7ad1 100%);
  color: #fff;
  padding: 32px 28px 24px;
  text-align: center;
}
.donate-emoji { font-size: 36px; display: block; margin-bottom: 10px; }
.donate-header h3 { font-size: 20px; font-weight: 800; margin-bottom: 8px; }
.donate-header p  { font-size: 14px; opacity: .9; line-height: 1.6; }

.donate-body { padding: 28px; text-align: center; }

.donate-logo { margin-bottom: 20px; }

.donate-number {
  display: flex; align-items: center; justify-content: center;
  gap: 10px; flex-wrap: wrap; margin-bottom: 10px;
}
.donate-number .label {
  font-size: 13px; color: var(--gray-400);
  width: 100%; margin-bottom: 4px;
}
.donate-number .number {
  font-size: 26px; font-weight: 800;
  color: var(--dana-blue);
  letter-spacing: 1px;
}
.btn-copy {
  background: var(--blue-light);
  border: 1.5px solid #bfdbfe;
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
  color: var(--blue);
  font-size: 14px;
  transition: var(--transition);
  position: relative;
}
.btn-copy:hover { background: #dbeafe; }
.copy-tooltip {
  position: absolute;
  top: -30px; left: 50%; transform: translateX(-50%);
  background: #1e293b; color: #fff;
  font-size: 11px; padding: 4px 8px; border-radius: 6px;
  pointer-events: none;
  opacity: 0; transition: opacity .2s;
  white-space: nowrap;
}
.copy-tooltip.show { opacity: 1; }

.donate-name { font-size: 14px; color: var(--gray-600); margin-bottom: 16px; }
.donate-thanks { font-size: 13px; color: var(--gray-400); }

/* ── Footer ── */
.footer {
  background: var(--gray-800);
  color: var(--gray-400);
  text-align: center;
  padding: 28px 16px;
  font-size: 13.5px;
  line-height: 1.8;
}
.footer-sub  { font-size: 12px; opacity: .65; margin-top: 4px; }
.footer-link {
  color: #7dd3fc;
  text-decoration: none;
  font-weight: 600;
}
.footer-link:hover { text-decoration: underline; }

/* ════════════════════════════════════════════════
   DEVELOPER CARD
   ════════════════════════════════════════════════ */
.dev-section {
  background: var(--gray-800);
  padding: 28px 16px 0;
}
.dev-card {
  max-width: 520px; margin: 0 auto;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 16px;
  padding: 20px 24px;
  display: flex; align-items: center; gap: 18px;
  flex-wrap: wrap;
}
.dev-avatar {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: linear-gradient(135deg, #2563eb, #06b6d4);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; color: #fff;
  flex-shrink: 0;
}
.dev-info  { flex: 1; min-width: 0; }
.dev-label { font-size: 11px; color: var(--gray-400); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 2px; }
.dev-name  { font-size: 16px; font-weight: 700; color: #f1f5f9; margin-bottom: 4px; }
.dev-link  {
  font-size: 13px; color: #7dd3fc;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 5px;
}
.dev-link:hover { text-decoration: underline; }
.dev-badge {
  background: rgba(37,99,235,.35);
  border: 1px solid rgba(37,99,235,.5);
  color: #93c5fd;
  font-size: 12px; font-weight: 600;
  padding: 5px 12px; border-radius: 99px;
  display: flex; align-items: center; gap: 6px;
  flex-shrink: 0;
}

/* ── Utilities ── */
.hidden { display: none !important; }

/* ── Spinner on merge button ── */
.spin { animation: spin .7s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Responsive ── */
@media (max-width: 500px) {
  .card { padding: 22px 16px; }
  .result-box { flex-direction: column; text-align: center; }
  .donate-number .number { font-size: 22px; }
}

/* ════════════════════════════════════════════════
   HERO BADGES
   ════════════════════════════════════════════════ */
.hero-badges {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 10px; margin-top: 20px;
}
.hero-badges span {
  background: rgba(255,255,255,.18);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 99px;
  padding: 6px 16px;
  font-size: 13px; font-weight: 600;
  display: flex; align-items: center; gap: 6px;
}

/* ════════════════════════════════════════════════
   SEO CONTENT SECTION
   ════════════════════════════════════════════════ */
.seo-section {
  background: #fff;
  padding: 64px 16px;
  border-top: 1px solid var(--gray-200);
}
.seo-container {
  max-width: 860px;
  margin: 0 auto;
  display: flex; flex-direction: column; gap: 52px;
}
.seo-container h2 {
  font-size: 22px; font-weight: 800; color: var(--gray-800);
  margin-bottom: 20px; display: flex; align-items: center; gap: 10px;
}
.seo-container h2 i { color: var(--blue); }

/* How-to steps */
.how-steps { display: flex; flex-direction: column; gap: 18px; }
.how-step {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 16px 20px;
  background: var(--gray-50);
  border-radius: 12px;
  border-left: 4px solid var(--blue);
}
.how-num {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--blue); color: #fff;
  font-size: 14px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.how-step strong { font-size: 15px; display: block; margin-bottom: 4px; }
.how-step p { font-size: 13.5px; color: var(--gray-600); margin: 0; }

/* Format grid */
.format-grid {
  display: flex; flex-wrap: wrap; gap: 10px;
}
.fmt {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px; font-weight: 600;
}
.fmt-pdf { background: #fef2f2; color: #dc2626; border: 1.5px solid #fecaca; }
.fmt-img { background: #fffbeb; color: #d97706; border: 1.5px solid #fde68a; }

/* FAQ */
.faq-list { display: flex; flex-direction: column; gap: 10px; }
.faq-item {
  background: var(--gray-50);
  border: 1.5px solid var(--gray-200);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item[open] { border-color: #bfdbfe; background: var(--blue-light); }
.faq-item summary {
  padding: 16px 20px;
  font-size: 15px; font-weight: 600;
  cursor: pointer; list-style: none;
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px;
  user-select: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '\f078'; font-family: 'Font Awesome 6 Free'; font-weight: 900;
  font-size: 12px; color: var(--gray-400);
  transition: transform .2s;
  flex-shrink: 0;
}
.faq-item[open] summary::after { transform: rotate(180deg); }
.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px; color: var(--gray-600); line-height: 1.7;
  margin: 0;
}

/* Keyword cloud */
.seo-keyw {
  background: var(--gray-50);
  border-radius: 12px;
  padding: 16px 20px;
  font-size: 13px; color: var(--gray-400);
  line-height: 1.8;
}
.seo-keyw strong { color: var(--gray-600); }