:root {
  color-scheme: light;
  --color-primary: #1f3a5f;
  --color-primary-deep: #16283f;
  --color-accent: #a53f2b;
  --color-accent-soft: #f7e9e4;
  --color-background: #f4f1ea;
  --color-surface: #ffffff;
  --color-surface-muted: #faf8f3;
  --color-text: #23201b;
  --color-muted-text: #6d665d;
  --color-border: #ddd6c8;
  --color-focus: #2f6fdd;
  --color-success: #2e7d4f;
  --color-sidebar: #1f3a5f;
  --color-sidebar-text: #e8e3d8;
  --color-sidebar-muted: #9fb0c4;
  --font-body: ui-sans-serif, system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Songti SC", "SimSun", Georgia, "Noto Serif SC", serif;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --space-unit: 0.25rem;
  --content-width: 72rem;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
}

button,
input,
select,
textarea {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.skip-link {
  left: 1rem;
  position: fixed;
  top: 1rem;
  transform: translateY(-200%);
  z-index: 100;
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-md);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 布局壳层 ---------- */
.app-shell {
  display: flex;
  min-height: 100dvh;
}

.sidebar {
  width: 260px;
  flex: 0 0 260px;
  background: var(--color-sidebar);
  color: var(--color-sidebar-text);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100dvh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-mark {
  width: 2.25rem;
  height: 2.25rem;
  flex: 0 0 auto;
  color: var(--color-sidebar);
  background: #efe8d8;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  display: block;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--color-sidebar-muted);
  display: block;
  margin-top: 0.1rem;
}

.nav {
  padding: 0.75rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.nav-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-sidebar-muted);
  padding: 0.6rem 0.6rem 0.2rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--color-sidebar-text);
  text-decoration: none;
  font-size: 0.92rem;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.08);
}

.nav-item[aria-current="page"] {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
}

.nav-item .nav-ico {
  width: 1.1rem;
  height: 1.1rem;
  flex: 0 0 auto;
  opacity: 0.85;
}

.sidebar-footer {
  margin-top: auto;
  padding: 0.9rem 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.6rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.06);
  margin-bottom: 0.4rem;
}

.user-avatar {
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 600;
  flex: 0 0 auto;
}

.user-name {
  font-size: 0.85rem;
  color: #fff;
  display: block;
}

.user-role {
  font-size: 0.72rem;
  color: var(--color-sidebar-muted);
  display: block;
}

.main-col {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 0.9rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 10;
}

.topbar-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
}

.topbar-actions {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

main {
  padding: 1.5rem;
  max-width: var(--content-width);
  width: 100%;
  margin: 0 auto;
}

.page-head {
  margin-bottom: 1.25rem;
}

.page-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 0.3rem;
}

.page-desc {
  margin: 0;
  color: var(--color-muted-text);
  font-size: 0.92rem;
}

/* ---------- 通用组件 ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  line-height: 1;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-deep);
}

.btn-accent {
  background: var(--color-accent);
  color: #fff;
}
.btn-accent:hover {
  background: #8e3625;
}

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

.btn-ghost {
  background: transparent;
  color: var(--color-muted-text);
}
.btn-ghost:hover {
  background: var(--color-surface-muted);
}

.btn-sm {
  padding: 0.4rem 0.7rem;
  font-size: 0.82rem;
}

.btn:disabled,
.btn[disabled] {
  background: #c9c3b8;
  color: #f4f1ea;
  cursor: not-allowed;
  opacity: 0.75;
}

.btn:disabled:hover {
  background: #c9c3b8;
}

.btn-link {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  padding: 0;
  font-size: 0.88rem;
  text-decoration: underline;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--color-text);
}

.field .hint {
  font-size: 0.78rem;
  color: var(--color-muted-text);
}

.input,
.select,
.textarea {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.55rem 0.7rem;
  font-size: 0.9rem;
  background: var(--color-surface);
  color: var(--color-text);
  width: 100%;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--color-muted-text);
}

.textarea {
  resize: vertical;
  min-height: 6rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 500;
}

.tag-type-paper {
  background: #e8eef6;
  color: #1f3a5f;
}
.tag-type-book {
  background: #f1ece0;
  color: #6b4f1d;
}
.tag-type-journal {
  background: #e7f0ea;
  color: #2e6b4a;
}
.tag-direction {
  background: #efefeb;
  color: var(--color-muted-text);
}
.tag-grade {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}
.tag-plain {
  background: var(--color-surface-muted);
  color: var(--color-muted-text);
  border: 1px solid var(--color-border);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  padding: 1rem;
}

.filter-bar .search {
  flex: 1 1 240px;
  min-width: 200px;
  position: relative;
}

.filter-bar .search input {
  padding-left: 2.2rem;
}

.filter-bar .search .search-ico {
  position: absolute;
  left: 0.7rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-muted-text);
  width: 1rem;
  height: 1rem;
  pointer-events: none;
}

.filter-bar .select {
  width: auto;
  min-width: 130px;
}

/* 资料列表卡片 */
.material-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.material-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem 1.15rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.material-card:hover {
  border-color: #c7bfad;
}

.material-thumb {
  width: 3.25rem;
  height: 3.25rem;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.7rem;
  text-align: center;
  padding: 0.25rem;
  line-height: 1.1;
}

.thumb-paper {
  background: #46658a;
}
.thumb-book {
  background: #8a6b3f;
}
.thumb-journal {
  background: #4f7d63;
}

.material-body {
  flex: 1 1 auto;
  min-width: 0;
}

.material-title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.25rem;
  overflow-wrap: anywhere;
}

.material-title a {
  color: var(--color-text);
  text-decoration: none;
}
.material-title a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}

#m-title {
  overflow-wrap: anywhere;
}

.material-meta {
  font-size: 0.82rem;
  color: var(--color-muted-text);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  margin-bottom: 0.55rem;
}

.material-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.material-actions {
  flex: 0 0 auto;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

/* 详情页 */
.detail-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(280px, 0.9fr);
  gap: 1.25rem;
  align-items: start;
}

.preview-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-muted);
  gap: 0.5rem;
}

.preview-stage {
  background: #3b3f46;
  display: grid;
  place-items: center;
  min-height: 440px;
  color: #cbd2db;
  text-align: center;
  padding: 2rem;
}

.preview-page {
  width: 100%;
  max-width: 430px;
  background: #fff;
  color: #3a3a3a;
  border-radius: 2px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  padding: 2rem 2.2rem;
  text-align: left;
  font-size: 0.85rem;
  line-height: 1.7;
}

.preview-page h4 {
  font-family: var(--font-display);
  margin: 0 0 0.8rem;
  font-size: 1rem;
}

.preview-page .preview-line {
  background: #e6e2d8;
  height: 7px;
  border-radius: 2px;
  margin-bottom: 0.5rem;
}

.meta-list {
  display: flex;
  flex-direction: column;
}

.meta-row {
  display: flex;
  padding: 0.65rem 0.35rem;
  border-bottom: 1px solid var(--color-border);
  gap: 1rem;
  font-size: 0.88rem;
}

.meta-row:last-child {
  border-bottom: none;
}

.meta-key {
  flex: 0 0 5.5rem;
  color: var(--color-muted-text);
}

.meta-val {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  min-height: 2.5rem;
  cursor: pointer;
}

.pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-top: 1rem;
}

.pager-info {
  color: var(--color-muted-text);
  font-size: 0.86rem;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-md);
  color: var(--color-text);
  cursor: pointer;
  flex: 0 0 auto;
}

.nav-mask {
  display: none;
  position: fixed;
  inset: 0;
  border: 0;
  padding: 0;
  background: rgba(22, 40, 63, 0.46);
  z-index: 30;
  cursor: pointer;
}

/* 表格 */
.table-wrap {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.table th,
.table td {
  text-align: left;
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.table th {
  color: var(--color-muted-text);
  font-weight: 600;
  background: var(--color-surface-muted);
  font-size: 0.8rem;
}

.table tr:last-child td {
  border-bottom: none;
}

/* 上传拖拽区 */
.dropzone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-muted);
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--color-muted-text);
  cursor: pointer;
}

.dropzone:hover,
.dropzone.drag-over {
  border-color: var(--color-primary);
  background: #eef2f7;
}

.dropzone .dz-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.3rem;
}

/* 空态 */
.empty-state {
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--color-muted-text);
}

.empty-state .empty-title {
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: 0.3rem;
}

/* toast */
.toast-stack {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
}

.toast {
  background: var(--color-primary-deep);
  color: #fff;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.86rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

/* 登录页 */
.login-wrap {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(31, 58, 95, 0.10), transparent 70%),
    var(--color-background);
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  padding: 2.25rem 2rem;
  box-shadow: 0 16px 48px rgba(28, 34, 44, 0.08);
}

.login-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.login-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0.75rem 0 0.2rem;
}

.login-sub {
  color: var(--color-muted-text);
  font-size: 0.88rem;
  margin: 0 0 1.4rem;
}

.form-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* 手机与窄屏：侧边栏改为抽屉，表单和列表改为单列 */
@media (max-width: 959px) {
  .nav-toggle {
    display: inline-flex;
  }
  .nav-mask.is-open {
    display: block;
  }
  .app-shell {
    display: block;
  }
  .sidebar {
    position: fixed;
    z-index: 40;
    top: 0;
    left: 0;
    width: min(18.5rem, 86vw);
    height: 100dvh;
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    box-shadow: none;
  }
  body.nav-open .sidebar {
    transform: none;
    box-shadow: 8px 0 28px rgba(22, 40, 63, 0.28);
  }
  .nav {
    flex-direction: column;
    overflow: auto;
  }
  .nav-item {
    min-height: 2.75rem;
    white-space: normal;
  }
  .sidebar-footer {
    display: block;
  }
  .topbar {
    padding: 0.7rem 0.85rem;
    gap: 0.6rem;
  }
  .topbar-title {
    font-size: 1.05rem;
    flex: 1 1 auto;
    min-width: 0;
  }
  main {
    padding: 0.9rem 0.85rem calc(1.25rem + env(safe-area-inset-bottom));
  }
  .detail-layout {
    grid-template-columns: 1fr;
  }
  .input,
  .select,
  .textarea,
  .field input,
  .field select,
  .field textarea {
    font-size: 16px;
  }
  .filter-bar .search,
  .filter-bar .select,
  .filter-bar .check {
    flex: 1 1 100%;
    width: 100%;
    min-width: 0;
  }
  .material-card {
    flex-wrap: wrap;
    padding: 0.9rem;
  }
  .material-actions {
    width: 100%;
  }
  .material-actions .btn {
    flex: 1 1 auto;
    justify-content: center;
    min-height: 2.5rem;
  }
  .preview-toolbar {
    flex-wrap: wrap;
  }
  .preview-stage {
    min-height: 280px;
    padding: 0.75rem;
  }
  .meta-row {
    flex-direction: column;
    gap: 0.15rem;
  }
  .meta-key {
    flex: none;
  }
  .login-wrap {
    padding: 1rem;
    align-items: start;
  }
  .login-card {
    padding: 1.4rem 1.05rem 1.2rem;
    margin-top: 0.5rem;
  }
  .login-card .btn-primary {
    width: 100%;
    justify-content: center;
    min-height: 2.75rem;
  }
  .toast-stack {
    left: 0.75rem;
    right: 0.75rem;
    bottom: calc(0.75rem + env(safe-area-inset-bottom));
  }
  .toast {
    text-align: center;
  }
  .modal {
    padding: 1rem 0.9rem 1.1rem;
  }
  .form-actions {
    flex-direction: column-reverse;
  }
  .form-actions .btn {
    width: 100%;
    justify-content: center;
    min-height: 2.75rem;
  }
  .dropzone,
  .drop-zone {
    padding: 1.3rem 0.9rem;
  }
  .card-pad {
    padding: 1rem !important;
  }
  .table-responsive thead {
    display: none;
  }
  .table-responsive .table,
  .table-responsive tbody,
  .table-responsive tr,
  .table-responsive td {
    display: block;
    width: 100%;
  }
  .table-responsive tr {
    border-bottom: 1px solid var(--color-border);
    padding: 0.7rem 0.15rem;
  }
  .table-responsive td {
    border: 0;
    padding: 0.28rem 0.75rem;
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    text-align: right;
  }
  .table-responsive td::before {
    content: attr(data-label);
    color: var(--color-muted-text);
    font-weight: 600;
    text-align: left;
    flex: 0 0 auto;
  }
  .row-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 0.9rem;
    justify-content: flex-end;
  }
}

@media (max-width: 480px) {
  .topbar-actions {
    width: auto;
  }
  .topbar-actions .btn {
    min-height: 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}
/* ===== 详情页编辑弹窗、危险操作、包裹式表单（新增） ===== */
.btn-danger-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid color-mix(in srgb, var(--color-accent) 45%, transparent);
}
.btn-danger-outline:hover {
  background: var(--color-accent);
  color: #fff;
}
.btn-disabled,
a.btn-disabled {
  opacity: 0.5;
  pointer-events: none;
}

.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(31, 58, 95, 0.45);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 4vh 1rem;
  z-index: 1000;
  overflow-y: auto;
}
.modal {
  background: var(--color-surface, #fff);
  border-radius: var(--radius, 10px);
  box-shadow: 0 18px 48px rgba(20, 30, 50, 0.28);
  width: min(720px, 100%);
  padding: 1.4rem 1.6rem 1.6rem;
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}
.modal-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
}
.icon-btn {
  border: 0;
  background: transparent;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--color-muted-text, #8a8378);
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
}
.icon-btn:hover { background: var(--color-surface-muted, #f1ece2); color: var(--color-ink, #2b2620); }

/* 包裹式字段：label.field 包住 span 标题与控件 */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem 1.2rem; }
.form-grid .span-2 { grid-column: 1 / -1; }
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 0.35rem; }
.field > span { font-size: 0.88rem; font-weight: 600; color: var(--color-ink, #2b2620); }
.field > span em { color: var(--color-accent, #a53f2b); font-style: normal; }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--color-border, #d9d2c4);
  border-radius: 8px;
  font: inherit;
  background: #fff;
  color: inherit;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--color-primary, #1f3a5f);
  box-shadow: 0 0 0 3px rgba(31, 58, 95, 0.15);
}
.field textarea { resize: vertical; }

.form-divider {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin: 1.4rem 0 0.9rem;
  font-size: 0.85rem;
  color: var(--color-muted-text, #8a8378);
}
.form-divider::before,
.form-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border, #d9d2c4);
}
.form-actions { display: flex; justify-content: flex-end; gap: 0.7rem; flex-wrap: wrap; }
.cat-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; align-items: start; }
.cat-row { display: flex; justify-content: space-between; align-items: center; gap: 0.75rem; padding: 0.7rem 0.9rem; border-bottom: 1px solid var(--color-border); }
.cat-row:last-child { border-bottom: none; }
@media (max-width: 760px) {
  .cat-grid { grid-template-columns: 1fr; }
  .cat-grid > .card { grid-column: auto !important; }
}

/* 详情页替换文件拖放区（与上传页 .dropzone 风格一致，类名独立） */
.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 1.6rem;
  border: 1.5px dashed var(--color-border, #c9bfa9);
  border-radius: 10px;
  background: var(--color-surface-muted, #f7f4ec);
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--color-primary, #1f3a5f);
  background: rgba(31, 58, 95, 0.06);
}
.drop-zone:focus-visible {
  outline: none;
  border-color: var(--color-primary, #1f3a5f);
  box-shadow: 0 0 0 3px rgba(31, 58, 95, 0.15);
}
.drop-zone .drop-icon { color: var(--color-primary, #1f3a5f); }
.drop-zone .drop-icon svg { width: 30px; height: 30px; }
.drop-zone .drop-title { font-weight: 600; color: var(--color-ink, #2b2620); }
.drop-zone .drop-hint { font-size: 0.8rem; color: var(--color-muted-text, #8a8378); }

.loading-state,
.error-state {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--color-muted-text, #8a8378);
}

[hidden] { display: none !important; }