:root {
  --glass-bg: rgba(255, 255, 255, 0.15);
  --glass-border: rgba(255, 255, 255, 0.25);
  --text-main: #f5f7fa;
  --text-dim: rgba(255, 255, 255, 0.75);
  --accent: #6ee7f5;
  --accent-2: #93c5fd;
  --danger: #fca5a5;
  --ok: #86efac;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-main);
}

body {
  background-image: url('/static/background.jpg') !important;
  background-size: cover !important;
  background-position: center !important;
  background-attachment: fixed !important;
  background-repeat: no-repeat !important;
}

.glass {
  background-color: var(--glass-bg) !important;
  backdrop-filter: blur(10px) !important;
  -webkit-backdrop-filter: blur(10px) !important;
  border: 1px solid var(--glass-border) !important;
  border-radius: 12px !important;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

/* 登录页 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login-card { width: 100%; max-width: 360px; padding: 38px 32px; }
.login-logo { text-align: center; margin-bottom: 8px; }
.login-logo h1 {
  font-size: 30px; letter-spacing: 2px;
  background: linear-gradient(90deg, #a5f3fc, #fbcfe8, #a7f3d0);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  text-shadow: 0 1px 2px rgba(0,0,0,0.25);
}
.login-sub { text-align: center; color: var(--text-dim); font-size: 13px; margin-bottom: 26px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.field input {
  width: 100%; padding: 11px 13px; border-radius: 10px;
  border: 1px solid var(--glass-border); background: rgba(255,255,255,0.12);
  color: #fff; font-size: 15px; outline: none; transition: border-color .2s;
}
.field input:focus { border-color: var(--accent); background: rgba(255,255,255,0.18); }
.field input::placeholder { color: rgba(255,255,255,0.45); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  width: 100%; padding: 12px; border: none; border-radius: 10px;
  font-size: 15px; font-weight: 600; color: #0b1a2a;
  background: linear-gradient(90deg, #67e8f9, #a7f3d0);
  cursor: pointer; transition: opacity .2s, transform .1s;
}
.btn:hover { opacity: 0.9; }
.btn:active { transform: translateY(1px); }
.btn-secondary { background: rgba(255,255,255,0.2); color: #fff; border: 1px solid var(--glass-border); }
.login-err { color: var(--danger); font-size: 13px; text-align: center; min-height: 18px; margin-top: 10px; }

.app-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 22px; position: sticky; top: 0; z-index: 40;
}
.app-header .brand {
  font-size: 20px; font-weight: 700; letter-spacing: 1px;
  background: linear-gradient(90deg, #a5f3fc, #fbcfe8, #a7f3d0);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.app-header .hdr-right { display: flex; align-items: center; gap: 10px; }
.hdr-user { color: var(--text-dim); font-size: 14px; }
.icon-btn {
  border: 1px solid var(--glass-border); background: rgba(255,255,255,0.14);
  color: #fff; border-radius: 10px; padding: 8px 14px; cursor: pointer;
  font-size: 14px; transition: background .2s;
}
.icon-btn:hover { background: rgba(255,255,255,0.24); }

.app-main {
  display: grid; grid-template-columns: 300px 1fr; gap: 16px;
  padding: 18px 22px; height: calc(100vh - 68px);
}
.panel { padding: 16px; overflow-y: auto; }

.panel-title {
  font-size: 15px; font-weight: 700; margin-bottom: 12px; color: #fff;
  display: flex; align-items: center; justify-content: space-between;
}
.dropzone {
  border: 2px dashed rgba(255,255,255,0.35); border-radius: 12px;
  padding: 24px 16px; text-align: center; color: var(--text-dim);
  font-size: 13px; cursor: pointer; transition: all .2s;
}
.dropzone:hover { background: rgba(255,255,255,0.08); border-color: var(--accent); }
.dropzone.dragover { border-color: var(--accent); background: rgba(110,231,245,0.12); }
.dropzone b { color: #fff; }
.dz-hint { margin-top: 6px; font-size: 11px; }
.upload-progress { margin-top: 12px; display: none; }
.upload-status { margin-top: 10px; font-size: 13px; color: var(--text-dim); }

.doc-list { margin-top: 16px; }
.doc-item {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 9px 11px; border-radius: 10px; background: rgba(255,255,255,0.08);
  margin-bottom: 8px; cursor: pointer; font-size: 13px; transition: background .2s;
}
.doc-item:hover { background: rgba(255,255,255,0.18); }
.doc-item.active { border: 1px solid var(--accent); }
.doc-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1 1 auto; min-width: 0; }
.doc-meta { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }
.doc-time { color: var(--text-dim); font-size: 11px; }
.doc-del {
  border: none; background: none; color: var(--text-dim);
  cursor: pointer; font-size: 12px; padding: 2px 5px; border-radius: 6px;
  transition: color .15s, background .15s;
}
.doc-del:hover { color: var(--danger); background: rgba(255,255,255,0.14); }
.doc-empty { color: var(--text-dim); font-size: 13px; text-align: center; margin-top: 18px; }

/* 文本阅读区 */
.text-area { display: flex; flex-direction: column; overflow: hidden; }
.text-scroll { flex: 1; overflow: auto; padding: 24px 30px; }
.doc-title {
  font-size: 18px; font-weight: 700; color: #fff; margin-bottom: 18px;
  padding-bottom: 12px; border-bottom: 1px solid rgba(255,255,255,0.25);
}
.text-viewer {
  max-width: 760px; margin: 0 auto; padding-bottom: 40px;
  font-size: 17px; line-height: 2; color: #f5f7fa;
}
.text-viewer p { margin-bottom: 18px; }
.text-viewer .word {
  cursor: pointer; border-radius: 4px; padding: 0 1px;
  transition: background .15s;
}
.text-viewer .word:hover { background: rgba(110,231,245,0.28); }
.text-viewer .word:active { background: rgba(110,231,245,0.45); }
.text-viewer p::selection { background: rgba(110,231,245,0.35); }
::selection { background: rgba(110,231,245,0.35); }

.text-empty {
  height: 100%; display: flex; flex-direction: column; align-items: center;
  justify-content: center; color: var(--text-dim); gap: 12px;
}
.text-empty .big { font-size: 18px; letter-spacing: 4px; }
.text-empty .hint { font-size: 12px; }

/* 翻译弹窗 */
#translate-popup {
  position: fixed; z-index: 1000; width: 300px; max-width: 90vw; padding: 12px 14px; display: none;
}
#translate-popup.show { display: block; animation: pop .15s ease; }
@keyframes pop { from { opacity: 0; transform: translateY(6px);} to { opacity:1; transform:none;} }
.popup-orig { font-size: 13px; color: var(--text-dim); margin-bottom: 4px; word-break: break-word; max-height: 60px; overflow: hidden; }
.popup-trans { font-size: 15px; color: #fff; line-height: 1.5; margin-bottom: 8px; word-break: break-word; }
.popup-loading { color: var(--text-dim); font-size: 13px; }
.popup-ask { font-size: 12px; color: var(--accent-2); margin-bottom: 8px; }
.popup-btns { display: flex; gap: 8px; }
.popup-btns .btn { font-size: 13px; padding: 7px 10px; font-weight: 500; }
.popup-added { color: var(--ok); font-size: 12px; margin-top: 6px; }
.popup-err { color: var(--danger); font-size: 12px; margin-top: 6px; }

/* 生单词本 */
.vocab-panel {
  position: fixed; top: 0; right: -340px; width: 320px; height: 100vh;
  padding: 18px 16px; z-index: 60; transition: right .25s ease; overflow-y: auto;
}
.vocab-panel.open { right: 0; }
.vocab-hd { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.vocab-title { font-weight: 700; color: #fff; font-size: 16px; }
.vocab-count { color: var(--text-dim); font-size: 12px; margin-top: 3px; }
.vocab-item { padding: 10px 12px; border-radius: 10px; background: rgba(255,255,255,0.08); margin-bottom: 8px; position: relative; }
.vocab-word { font-weight: 700; color: #fff; font-size: 14px; }
.vocab-trans { color: var(--text-dim); font-size: 13px; margin-top: 2px; }
.vocab-context { color: rgba(255,255,255,0.5); font-size: 12px; margin-top: 4px; font-style: italic; }
.vocab-del {
  position: absolute; top: 6px; right: 8px; color: var(--text-dim);
  background: none; border: none; cursor: pointer; font-size: 13px;
}
.vocab-del:hover { color: var(--danger); }
.vocab-empty { color: var(--text-dim); text-align: center; margin-top: 30px; font-size: 13px; }

@media (max-width: 900px) {
  .app-main { grid-template-columns: 1fr; height: auto; }
  .text-area { height: 70vh; }
}