/* ==============================
   ResizePDF – Exact Size Tool
   Design System & Styles
   ============================== */

/* ---------- Tokens ---------- */
:root {
  --clr-primary: #3b82f6;
  --clr-primary-dark: #2563eb;
  --clr-primary-light: #dbeafe;
  --clr-primary-softer: #eff6ff;
  --clr-success: #22c55e;
  --clr-success-light: #dcfce7;
  --clr-danger: #ef4444;
  --clr-danger-light: #fee2e2;
  --clr-text: #1e293b;
  --clr-text-secondary: #64748b;
  --clr-border: #e2e8f0;
  --clr-bg: #f0f5ff;
  --clr-card: #ffffff;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-card: 0 4px 24px rgba(59,130,246,.08), 0 1.5px 6px rgba(0,0,0,.04);
  --shadow-btn: 0 2px 8px rgba(59,130,246,.22);
  --transition: .25s cubic-bezier(.4,0,.2,1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--clr-text);
  background: var(--clr-bg);
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header ---------- */
.header {
  background: linear-gradient(135deg, var(--clr-primary) 0%, #1d4ed8 100%);
  color: #fff;
  text-align: center;
  padding: 28px 20px 24px;
}
.header-inner { max-width: 600px; margin: 0 auto; }
.logo {
  font-size: 1.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  letter-spacing: -.02em;
}
.logo-icon { width: 28px; height: 28px; flex-shrink: 0; }
.tagline {
  margin-top: 6px;
  font-size: .88rem;
  font-weight: 400;
  opacity: .88;
}

/* ---------- Main / Card ---------- */
.main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 28px 16px 20px;
}
.card {
  width: 100%;
  max-width: 480px;
  background: var(--clr-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 28px 22px 32px;
}

/* ---------- Sections ---------- */
.section { margin-bottom: 24px; }
.section:last-child { margin-bottom: 0; }
.section-title {
  font-size: .92rem;
  font-weight: 600;
  color: var(--clr-text-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: .04em;
}

/* ---------- Drop Zone ---------- */
.drop-zone {
  border: 2.5px dashed var(--clr-border);
  border-radius: var(--radius);
  padding: 36px 20px 28px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--clr-primary);
  background: var(--clr-primary-softer);
}
.upload-icon {
  width: 52px;
  height: 52px;
  color: var(--clr-primary);
  margin-bottom: 12px;
}
.drop-text {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.drop-subtext {
  font-size: .85rem;
  color: var(--clr-text-secondary);
}
.browse-link {
  color: var(--clr-primary);
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}
.formats-note {
  text-align: center;
  font-size: .78rem;
  color: var(--clr-text-secondary);
  margin-top: 10px;
}

/* ---------- Quick Presets ---------- */
.quick-presets {
  margin-bottom: 24px;
}
.preset-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.preset-btn {
  background: var(--clr-primary-softer);
  border: 1.5px solid var(--clr-primary-light);
  border-radius: var(--radius-sm);
  padding: 10px 4px;
  font-family: var(--font);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--clr-primary-dark);
  cursor: pointer;
  transition: all var(--transition);
}
.preset-btn:hover {
  background: var(--clr-primary-light);
  border-color: var(--clr-primary);
  transform: translateY(-1px);
}
.preset-btn.active {
  background: var(--clr-primary);
  color: #fff;
  border-color: var(--clr-primary);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}


/* ---------- File Preview ---------- */
.file-preview {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--clr-primary-softer);
  border: 1.5px solid var(--clr-primary-light);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 14px;
  animation: fadeSlideUp .35s ease;
}
.file-info {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.file-icon {
  width: 24px;
  height: 24px;
  color: var(--clr-primary);
  flex-shrink: 0;
}
.file-name {
  font-size: .88rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.file-size-label {
  font-size: .76rem;
  color: var(--clr-text-secondary);
}
.remove-btn {
  background: none;
  border: none;
  color: var(--clr-text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: color var(--transition), background var(--transition);
  flex-shrink: 0;
}
.remove-btn:hover {
  color: var(--clr-danger);
  background: var(--clr-danger-light);
}

/* ---------- Size Buttons ---------- */
.size-buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.size-btn {
  position: relative;
  background: var(--clr-card);
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-sm);
  padding: 14px 10px;
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  font-family: var(--font);
}
.size-btn:hover { border-color: var(--clr-primary); transform: translateY(-1px); }
.size-btn.selected {
  border-color: var(--clr-primary);
  background: var(--clr-primary-softer);
}
.size-value {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--clr-text);
}
.size-badge {
  display: inline-block;
  font-size: .65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  background: var(--clr-primary);
  color: #fff;
  padding: 2px 8px;
  border-radius: 20px;
  margin-top: 6px;
}
.size-badge.secondary {
  background: #8b5cf6;
}

/* ---------- Custom Input ---------- */
.custom-input-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  animation: fadeSlideUp .3s ease;
}
.custom-kb-input {
  flex: 1;
  padding: 12px 14px;
  font-size: .95rem;
  font-family: var(--font);
  border: 2px solid var(--clr-border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition);
}
.custom-kb-input:focus { border-color: var(--clr-primary); }
.custom-suffix {
  font-size: .92rem;
  font-weight: 600;
  color: var(--clr-text-secondary);
}

/* ---------- Action / Resize ---------- */
.action-section { text-align: center; }
.resize-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 16px 24px;
  font-size: 1.08rem;
  font-weight: 700;
  font-family: var(--font);
  color: #fff;
  background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-primary-dark) 100%);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  box-shadow: var(--shadow-btn);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}
.resize-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59,130,246,.32);
}
.resize-btn:active:not(:disabled) { transform: translateY(0); }
.resize-btn:disabled {
  opacity: .5;
  cursor: not-allowed;
  box-shadow: none;
}
.btn-icon { flex-shrink: 0; }

.trust-note {
  margin-top: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  opacity: 0.8;
}

.error-msg {
  margin-top: 10px;
  font-size: .82rem;
  color: var(--clr-danger);
  font-weight: 500;
}


/* ---------- Processing ---------- */
.processing-section {
  text-align: center;
  padding: 24px 0;
}
.spinner {
  width: 44px;
  height: 44px;
  border: 4px solid var(--clr-primary-light);
  border-top-color: var(--clr-primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin: 0 auto 16px;
}
.processing-text {
  font-size: .95rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  margin-bottom: 16px;
}
.progress-bar-wrap {
  height: 6px;
  background: var(--clr-primary-light);
  border-radius: 100px;
  overflow: hidden;
}
.progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--clr-primary), #7c3aed);
  border-radius: 100px;
  transition: width .3s ease;
}

/* ---------- Result ---------- */
.result-section {
  text-align: center;
  animation: fadeSlideUp .4s ease;
}
.result-check { margin-bottom: 12px; }
.result-check svg {
  animation: checkPop .5s cubic-bezier(.37,1.4,.62,1) forwards;
}
.result-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-success);
  margin-bottom: 18px;
}
.result-sizes {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
  padding: 16px;
  background: #f8fafc;
  border-radius: var(--radius-sm);
}
.result-size-item { text-align: center; }
.result-label {
  display: block;
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--clr-text-secondary);
  margin-bottom: 2px;
}
.result-value {
  font-size: 1.3rem;
  font-weight: 700;
}
.result-value.highlight { color: var(--clr-success); }
.result-arrow { color: var(--clr-text-secondary); flex-shrink: 0; }

.download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 16px 24px;
  font-size: 1.08rem;
  font-weight: 700;
  font-family: var(--font);
  color: #fff;
  background: linear-gradient(135deg, var(--clr-success) 0%, #16a34a 100%);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(34,197,94,.24);
  transition: transform var(--transition), box-shadow var(--transition);
}
.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(34,197,94,.32);
}
.download-btn:active { transform: translateY(0); }

.reset-btn {
  display: inline-block;
  margin-top: 14px;
  background: none;
  border: none;
  font-family: var(--font);
  font-size: .88rem;
  font-weight: 600;
  color: var(--clr-primary);
  cursor: pointer;
  text-decoration: underline;
  transition: color var(--transition);
}
.reset-btn:hover { color: var(--clr-primary-dark); }

/* ---------- Trust Badges ---------- */
.trust-section {
  padding: 16px 20px;
  text-align: center;
}
.trust-items {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  max-width: 480px;
  margin: 0 auto;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .82rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
}
.trust-item svg { color: var(--clr-primary); flex-shrink: 0; }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 18px 20px 24px;
  font-size: .78rem;
  color: var(--clr-text-secondary);
}
.footer a {
  color: var(--clr-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition);
}
.footer a:hover { color: var(--clr-primary-dark); text-decoration: underline; }

/* ---------- Utility ---------- */
.hidden { display: none !important; }

/* ---------- Animations ---------- */
@keyframes spin { to { transform: rotate(360deg); } }

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

@keyframes checkPop {
  0%   { transform: scale(0); opacity: 0; }
  60%  { transform: scale(1.15); opacity: 1; }
  100% { transform: scale(1); }
}

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  .header { padding: 22px 16px 18px; }
  .logo { font-size: 1.4rem; }
  .tagline { font-size: .82rem; }
  .card { padding: 22px 16px 26px; }
  .drop-zone { padding: 28px 14px 22px; }
  .upload-icon { width: 44px; height: 44px; }
  .size-buttons { gap: 8px; }
  .size-btn { padding: 12px 8px; }
  .result-sizes { flex-direction: row; gap: 10px; padding: 12px; }
  .result-value { font-size: 1.15rem; }
  .result-arrow { transform: rotate(0); }
}