:root {
  --c-bg: #FFFFFF;
  --c-surface: #F5F5F5;
  --c-surface2: #EBEBEB;
  --c-charcoal: #30343A;
  --c-red: #C83232;
  --c-red-dark: #A82828;
  --c-gray: #6B7280;
  --c-gray-light: #9CA3AF;
  --c-border: #D1D5DB;
  --c-green: #008A4B;
  --c-orange: #C45C00;
  --c-font: 15px;
  --c-radius: 10px;
  --c-shadow: 0 1px 4px rgba(0,0,0,0.06);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: var(--c-bg);
  color: var(--c-charcoal);
  min-height: 100vh;
  font-size: var(--c-font);
  line-height: 1.6;
}
body.size-sm { font-size: 13px; }
body.size-md { font-size: 15px; }
body.size-lg { font-size: 17px; }

@media print {
  body { display: none !important; }
}

.mono { font-family: "SF Mono", "Menlo", monospace; }

.font-controls { position: fixed; top: 12px; right: 16px; display: flex; gap: 4px; z-index: 300; background: var(--c-bg); border: 1px solid var(--c-border); border-radius: 8px; padding: 4px; box-shadow: var(--c-shadow); }
.font-btn { background: none; border: none; border-radius: 6px; padding: 4px 10px; font-size: 12px; font-weight: 600; color: var(--c-gray); cursor: pointer; transition: all .15s; }
.font-btn:hover { background: var(--c-surface); }
.font-btn.active { background: var(--c-charcoal); color: #fff; }

.label { font-size: 11px; color: var(--c-gray); letter-spacing: .5px; margin-bottom: 4px; font-weight: 500; text-transform: uppercase; }
.value { font-size: calc(var(--c-font) + 1px); color: var(--c-charcoal); white-space: pre-wrap; }

.card { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: var(--c-radius); padding: 20px; margin-bottom: 12px; box-shadow: var(--c-shadow); }
.card-title { font-size: 16px; font-weight: 700; color: var(--c-charcoal); margin-bottom: 16px; padding-bottom: 10px; border-bottom: 2px solid var(--c-red); letter-spacing: .5px; }

.viewer-page { position: relative; min-height: 100vh; padding: 20px 16px 80px; }
.viewer-page::before {
  content: ""; position: fixed; inset: 0;
  background-image: repeating-linear-gradient(45deg, transparent, transparent 100px, rgba(200,50,50,0.025) 100px, rgba(200,50,50,0.025) 200px);
  pointer-events: none; z-index: 0;
}
.viewer-page > * { position: relative; z-index: 1; }
.viewer-watermark-text {
  position: fixed; top: 50%; left: 50%; transform: translate(-50%,-50%) rotate(-20deg);
  font-size: 24px; font-weight: 800; color: rgba(48,52,58,0.06); white-space: nowrap;
  pointer-events: none; user-select: none; z-index: 0; letter-spacing: 6px;
}

.case-header { text-align: center; padding: 24px 0 20px; }
.case-no { font-size: 20px; font-weight: 800; color: var(--c-charcoal); letter-spacing: 2px; margin-bottom: 6px; }
.case-status { display: inline-block; background: #E6F4EF; color: var(--c-green); font-size: 11px; font-weight: 600; padding: 4px 12px; border-radius: 20px; letter-spacing: .5px; text-transform: uppercase; }
.case-status.expired { background: #FEF2F2; color: var(--c-red); }
.case-status.paused { background: #FFF4E6; color: var(--c-orange); }

.amount { font-size: 28px; font-weight: 800; color: var(--c-charcoal); letter-spacing: -.5px; }
.amount-unit { font-size: 14px; color: var(--c-gray); font-weight: 400; margin-left: 2px; }

.info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.section-label { font-size: 11px; color: var(--c-gray); letter-spacing: 1px; margin: 20px 0 10px; padding-left: 10px; border-left: 3px solid var(--c-red); text-transform: uppercase; font-weight: 600; }

.files-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.file-item { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 8px; padding: 12px; display: flex; align-items: center; gap: 10px; cursor: pointer; transition: border-color .2s, box-shadow .2s; }
.file-item:hover { border-color: var(--c-red); box-shadow: 0 0 0 2px rgba(200,50,50,0.08); }
.file-icon { width: 36px; height: 36px; background: var(--c-charcoal); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 16px; flex-shrink: 0; }
.file-info { flex: 1; min-width: 0; }
.file-name { font-size: 13px; color: var(--c-charcoal); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.file-type { font-size: 11px; color: var(--c-gray-light); margin-top: 2px; }

.footer { position: fixed; bottom: 0; left: 0; right: 0; background: var(--c-bg); border-top: 1px solid var(--c-border); padding: 12px 16px; text-align: center; font-size: 11px; color: var(--c-gray-light); z-index: 10; }

.password-page, .expired-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.password-box, .expired-box { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: 16px; padding: 40px 30px; width: 100%; max-width: 380px; text-align: center; box-shadow: 0 4px 20px rgba(0,0,0,0.08); }
.password-icon, .expired-icon { font-size: 40px; margin-bottom: 12px; display: block; }
.expired-icon { font-size: 48px; margin-bottom: 16px; }
.password-title, .expired-title { font-size: 20px; font-weight: 700; color: var(--c-charcoal); margin-bottom: 6px; }
.expired-title { color: var(--c-red); margin-bottom: 8px; }
.password-sub, .expired-sub { font-size: 13px; color: var(--c-gray); margin-bottom: 28px; }
.expired-sub { margin-bottom: 0; }
.password-input { width: 100%; background: var(--c-surface); border: 1.5px solid var(--c-border); border-radius: 10px; padding: 14px 16px; font-size: 16px; color: var(--c-charcoal); text-align: center; letter-spacing: 4px; outline: none; transition: border-color .2s; }
.password-input:focus { border-color: var(--c-red); }
.password-input::placeholder { color: var(--c-gray-light); letter-spacing: 1px; }
.password-btn { width: 100%; background: var(--c-charcoal); color: #fff; border: none; border-radius: 10px; padding: 14px; font-size: 15px; font-weight: 600; cursor: pointer; margin-top: 14px; letter-spacing: 1px; transition: background .2s; }
.password-btn:hover { background: var(--c-red); }
.error-msg { color: var(--c-red); font-size: 13px; margin-top: 10px; display: none; }

.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.88); z-index: 100; flex-direction: column; align-items: center; justify-content: center; padding: 16px; }
.modal-overlay.show { display: flex; }
.modal-header { width: 100%; max-width: 900px; display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.modal-title { font-size: 14px; color: rgba(255,255,255,0.7); }
.modal-close { width: 36px; height: 36px; background: rgba(255,255,255,0.1); border: none; border-radius: 50%; color: rgba(255,255,255,0.7); font-size: 18px; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.modal-body { width: 100%; max-width: 900px; max-height: 75vh; display: flex; align-items: center; justify-content: center; overflow: hidden; border-radius: 12px; background: #0F1115; position: relative; }
.modal-img-wrap { max-width: 100%; max-height: 75vh; position: relative; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.modal-img-wrap img { max-width: 100%; max-height: 75vh; display: block; -webkit-user-drag: none; user-select: none; }
.modal-watermark { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; pointer-events: none; user-select: none; z-index: 10; overflow: hidden; }
.modal-watermark span { font-size: 20px; font-weight: 800; color: rgba(255,255,255,0.16); white-space: nowrap; letter-spacing: 4px; transform: rotate(-20deg); }
.modal-pdf-wrap { width: 100%; height: 75vh; }
.modal-pdf-wrap iframe { width: 100%; height: 100%; border: none; }
.modal-footer { width: 100%; max-width: 900px; display: flex; align-items: center; justify-content: space-between; margin-top: 10px; flex-wrap: wrap; gap: 8px; }
.modal-nav { display: flex; gap: 6px; }
.modal-nav-btn { background: rgba(255,255,255,0.1); border: none; border-radius: 8px; padding: 8px 14px; font-size: 13px; color: rgba(255,255,255,0.7); cursor: pointer; }
.modal-nav-btn:hover { background: rgba(255,255,255,0.2); }
.modal-counter { font-size: 13px; color: rgba(255,255,255,0.5); }
.protect-hint { display: flex; align-items: center; gap: 6px; font-size: 12px; color: rgba(255,255,255,0.4); }

.admin-page { padding: 20px 16px 60px; }
.admin-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.admin-title { font-size: 20px; font-weight: 700; color: var(--c-charcoal); }
.admin-badge { background: var(--c-charcoal); color: #fff; font-size: 11px; font-weight: 600; padding: 4px 10px; border-radius: 20px; letter-spacing: .5px; text-transform: uppercase; }
.admin-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.admin-action-btn { background: var(--c-bg); border: 1px solid var(--c-border); color: var(--c-charcoal); border-radius: 8px; padding: 8px 14px; font-size: 13px; cursor: pointer; display: flex; align-items: center; gap: 6px; font-weight: 500; transition: all .15s; text-decoration: none; }
.admin-action-btn:hover { border-color: var(--c-red); color: var(--c-red); }
.admin-action-btn.primary { background: var(--c-charcoal); color: #fff; border-color: var(--c-charcoal); }
.admin-action-btn.primary:hover { background: var(--c-red); border-color: var(--c-red); }

.date-range-box { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 14px; margin-bottom: 16px; display: none; }
.date-range-box.show { display: block; }
.date-range-title { font-size: 13px; color: var(--c-charcoal); margin-bottom: 10px; font-weight: 600; }
.date-range-inputs { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.date-input { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: 6px; padding: 8px 10px; font-size: 13px; color: var(--c-charcoal); outline: none; }
.date-input:focus { border-color: var(--c-red); }
.date-sep { color: var(--c-gray); font-size: 13px; }
.date-download-btn { background: var(--c-red); border: none; border-radius: 8px; padding: 8px 16px; font-size: 13px; color: #fff; cursor: pointer; font-weight: 600; }
.date-range-hint { font-size: 12px; color: var(--c-gray); margin-top: 8px; }

.batch-bar { background: var(--c-charcoal); border-radius: 10px; padding: 10px 14px; margin-bottom: 12px; display: none; align-items: center; gap: 10px; font-size: 13px; color: #fff; }
.batch-bar.show { display: flex; }
.batch-count { background: var(--c-red); border-radius: 20px; padding: 2px 10px; font-size: 12px; font-weight: 700; }

.case-list-item { background: var(--c-bg); border: 1px solid var(--c-border); border-radius: 12px; padding: 16px; margin-bottom: 10px; box-shadow: var(--c-shadow); }
.case-list-top { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
.case-list-check { width: 18px; height: 18px; cursor: pointer; accent-color: var(--c-red); }
.case-list-no { font-size: 15px; font-weight: 700; color: var(--c-charcoal); letter-spacing: 1px; }
.case-list-date { font-size: 12px; color: var(--c-gray); margin-top: 2px; }
.case-list-info { font-size: 13px; color: var(--c-gray); margin-bottom: 8px; }
.case-list-wm { font-size: 12px; color: var(--c-gray-light); margin-bottom: 10px; }
.case-list-wm span { color: var(--c-charcoal); font-weight: 600; }
.case-list-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.case-status-list { font-size: 10px; font-weight: 600; padding: 3px 8px; border-radius: 20px; text-transform: uppercase; letter-spacing: .5px; }
.case-status-list.active { background: #E6F4EF; color: var(--c-green); }
.case-status-list.paused { background: #FFF4E6; color: var(--c-orange); }
.case-status-list.expired { background: #FEF2F2; color: var(--c-red); }

.action-btn { flex: 1; min-width: 58px; padding: 7px 6px; border-radius: 8px; font-size: 12px; font-weight: 600; cursor: pointer; border: none; text-align: center; transition: all .15s; }
.action-download { background: var(--c-surface); color: var(--c-charcoal); border: 1px solid var(--c-border); }
.action-download:hover { border-color: var(--c-red); color: var(--c-red); }
.action-restart { background: #E6F4EF; color: var(--c-green); }
.action-restart:hover { background: #D0EFE0; }
.action-pause { background: #FFF4E6; color: var(--c-orange); }
.action-pause:hover { background: #FFE8CC; }
.action-delete { background: #FEF2F2; color: var(--c-red); }
.action-delete:hover { background: #FDD; }
.new-case-btn { width: 100%; background: var(--c-charcoal); color: #fff; border: none; border-radius: 12px; padding: 14px; font-size: 15px; font-weight: 600; cursor: pointer; margin-top: 10px; letter-spacing: .5px; transition: background .2s; }
.new-case-btn:hover { background: var(--c-red); }
.new-case-btn.secondary { background: var(--c-surface); color: var(--c-gray); border: 1px solid var(--c-border); }
.new-case-btn.secondary:hover { border-color: var(--c-charcoal); color: var(--c-charcoal); }

.form-page { padding: 20px 16px 40px; }
.form-page-title { font-size: 20px; font-weight: 700; color: var(--c-charcoal); margin-bottom: 20px; }
.form-group { margin-bottom: 14px; }
.form-label { font-size: 12px; color: var(--c-gray); margin-bottom: 6px; display: block; font-weight: 500; letter-spacing: .3px; }
.form-input, .form-textarea { width: 100%; background: var(--c-surface); border: 1.5px solid var(--c-border); border-radius: 8px; padding: 10px 12px; font-size: 14px; color: var(--c-charcoal); outline: none; transition: border-color .2s; font-family: inherit; }
.form-input:focus, .form-textarea:focus { border-color: var(--c-red); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-section-title { font-size: 12px; color: var(--c-gray); letter-spacing: 1px; margin: 20px 0 12px; padding-left: 10px; border-left: 3px solid var(--c-red); text-transform: uppercase; font-weight: 600; }
.watermark-preview { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 8px; padding: 12px 16px; margin-top: 8px; display: flex; align-items: center; gap: 10px; }
.watermark-preview-dot { width: 8px; height: 8px; background: var(--c-red); border-radius: 50%; flex-shrink: 0; }
.watermark-preview-text { font-size: 14px; color: var(--c-charcoal); }
.file-upload-area { border: 2px dashed var(--c-border); border-radius: 12px; padding: 24px; text-align: center; cursor: pointer; transition: border-color .2s; background: var(--c-surface); }
.file-upload-area:hover { border-color: var(--c-red); }
.upload-icon { font-size: 28px; margin-bottom: 6px; display: block; }
.upload-text { font-size: 14px; color: var(--c-gray); }
.upload-hint { font-size: 12px; color: var(--c-gray-light); margin-top: 4px; }
.file-list-item { display: flex; align-items: center; gap: 8px; padding: 8px 12px; background: var(--c-surface); border-radius: 8px; margin-bottom: 6px; border: 1px solid var(--c-border); }
.file-list-item .fname { flex: 1; font-size: 13px; color: var(--c-charcoal); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-list-item .fsize { font-size: 11px; color: var(--c-gray); }
.file-list-item .fremove { cursor: pointer; color: var(--c-red); font-size: 13px; padding: 0 4px; }
.days-input { width: 80px; text-align: center; }
.form-info-box { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: 12px; padding: 16px; margin: 16px 0; }
.form-info-label { font-size: 11px; color: var(--c-red); margin-bottom: 6px; font-weight: 600; text-transform: uppercase; letter-spacing: .5px; }
.form-info-value { font-size: 14px; color: var(--c-charcoal); margin-bottom: 4px; }
.form-error { background: #FEF2F2; color: var(--c-red); border-radius: 8px; padding: 10px 14px; font-size: 13px; margin-bottom: 14px; display: none; }

.login-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }

@media (min-width: 768px) {
  .viewer-page, .form-page, .admin-page { max-width: 640px; margin: 0 auto; }
  .info-grid { grid-template-columns: 1fr 1fr 1fr; }
  .files-grid { grid-template-columns: 1fr 1fr 1fr; }
  .form-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .info-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .date-range-inputs { flex-direction: column; align-items: flex-start; }
}