/* ============================================ */
/*   Modern Design System v2                     */
/*   Inspired by Notion / Linear / Vercel       */
/* ============================================ */

/* -------- Typography & Base -------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* === Core Palette === */
  --c-white: #ffffff;
  --c-gray-50:  #f8f9fb;
  --c-gray-75:  #f1f3f6;
  --c-gray-100: #e8ebf0;
  --c-gray-200: #d1d5dc;
  --c-gray-300: #b0b8c4;
  --c-gray-400: #8892a0;
  --c-gray-500: #697384;
  --c-gray-600: #4b5466;
  --c-gray-700: #353c4d;
  --c-gray-800: #1f2433;
  --c-gray-900: #131720;
  --c-gray-950: #0b0e14;
  --c-indigo-50:  #eef2ff;
  --c-indigo-100: #e0e7ff;
  --c-indigo-200: #c7d2fe;
  --c-indigo-400: #818cf8;
  --c-indigo-500: #6366f1;
  --c-indigo-600: #4f46e5;
  --c-indigo-700: #4338ca;
  --c-violet-400: #a78bfa;
  --c-violet-500: #8b5cf6;
  --c-violet-600: #7c3aed;
  --c-amber-400:  #fbbf24;
  --c-amber-500:  #f59e0b;
  --c-rose-400:   #fb7185;
  --c-rose-500:   #f43f5e;
  --c-emerald-400:#34d399;
  --c-emerald-500:#10b981;
  --c-sky-400:    #38bdf8;
  --c-sky-500:    #0ea5e9;

  /* === Gradient Accents === */
  --gradient-brand:  linear-gradient(135deg, var(--c-indigo-500), var(--c-violet-500));
  --gradient-brand-h: linear-gradient(135deg, var(--c-indigo-600), var(--c-violet-600));
  --gradient-warm:   linear-gradient(135deg, #f59e0b, #ef4444);
  --gradient-cool:   linear-gradient(135deg, #6366f1, #06b6d4);
  --gradient-soft:   linear-gradient(135deg, #eef2ff, #f5f3ff);

  /* === Theme: Light (default) === */
  --bg-root:         #f4f5f7;
  --bg-surface:      var(--c-white);
  --bg-elevated:     var(--c-white);
  --bg-overlay:      rgba(255,255,255,0.85);
  --bg-subtle:       var(--c-gray-50);
  --bg-input:        var(--c-white);
  --bg-nav:          rgba(255,255,255,0.82);

  --text-primary:    var(--c-gray-900);
  --text-secondary:  var(--c-gray-600);
  --text-tertiary:   var(--c-gray-400);
  --text-disabled:   var(--c-gray-300);
  --text-inverse:    var(--c-white);

  --border-default:  var(--c-gray-200);
  --border-subtle:   var(--c-gray-100);
  --border-strong:   var(--c-gray-300);

  --shadow-xs:  0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.06), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-lg:  0 12px 32px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-xl:  0 20px 48px rgba(0,0,0,0.1), 0 4px 12px rgba(0,0,0,0.05);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.06);

  --radius-xs:  6px;
  --radius-sm:  10px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --radius-xl:  32px;
  --radius-full:9999px;

  --font-sans: 'Inter', 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', system-ui, -apple-system, sans-serif;

  /* category tag bg tokens */
  --cat-bg-opacity: 0.08;
  --cat-border-opacity: 0.15;
}

/* ============================================ */
/*   Dark Theme                                 */
/* ============================================ */
[data-theme="dark"] {
  --bg-root:         var(--c-gray-950);
  --bg-surface:      #1a1d2e;
  --bg-elevated:     #222639;
  --bg-overlay:      rgba(26,29,46,0.88);
  --bg-subtle:       #1e2137;
  --bg-input:        #252840;
  --bg-nav:          rgba(19,23,32,0.85);

  --text-primary:    #e8ecf1;
  --text-secondary:  #a0a8b8;
  --text-tertiary:   #687084;
  --text-disabled:   #484d5c;
  --text-inverse:    var(--c-white);

  --border-default:  rgba(255,255,255,0.08);
  --border-subtle:   rgba(255,255,255,0.05);
  --border-strong:   rgba(255,255,255,0.12);

  --shadow-xs:  0 1px 2px rgba(0,0,0,0.18);
  --shadow-sm:  0 1px 3px rgba(0,0,0,0.25);
  --shadow-md:  0 4px 12px rgba(0,0,0,0.3);
  --shadow-lg:  0 12px 32px rgba(0,0,0,0.4);
  --shadow-xl:  0 20px 48px rgba(0,0,0,0.5);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.25), 0 4px 16px rgba(0,0,0,0.3);

  --cat-bg-opacity: 0.14;
  --cat-border-opacity: 0.20;
}

/* ============================================ */
/*   Global Reset & Base                        */
/* ============================================ */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }

html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

body {
  font-family: var(--font-sans);
  background: var(--bg-root);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  font-size: 15px;
  transition: background 0.3s ease, color 0.3s ease;
}

#app { min-height: 100vh; display: flex; flex-direction: column; animation: fadeIn 0.35s ease; }

a { color: var(--c-indigo-500); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--c-indigo-600); }

/* ============================================ */
/*   Subtle Background Pattern (dot-grid)       */
/* ============================================ */
@keyframes bgShift {
  0%,100% { background-position: 0 0; }
  50% { background-position: 2px 2px; }
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image: radial-gradient(circle, var(--border-subtle) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity: 0.5;
}
[data-theme="dark"] body::before { opacity: 0.3; }

/* ============================================ */
/*   Navigation                                 */
/* ============================================ */
.nav-bar {
  background: var(--bg-nav);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background 0.3s;
}

.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 18px; font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.3px;
}
.nav-logo:hover { color: var(--text-primary); }
.logo-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--gradient-brand);
  display: inline-block;
  box-shadow: 0 0 12px rgba(99,102,241,0.4);
}
.logo-icon { font-size: 22px; }

.mock-badge {
  font-size: 10px; font-weight: 700; letter-spacing: 0.6px;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: #fff; padding: 2px 10px; border-radius: var(--radius-full);
  text-transform: uppercase;
}

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-link {
  text-decoration: none; font-size: 14px; font-weight: 500;
  padding: 8px 16px; border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all 0.2s;
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-subtle); }
.nav-link.active {
  color: var(--c-indigo-500); background: rgba(99,102,241,0.08);
  font-weight: 600;
}
[data-theme="dark"] .nav-link.active { background: rgba(99,102,241,0.15); }

.nav-search { flex: 1; max-width: 320px; margin: 0 20px; }
.nav-user { display: flex; align-items: center; gap: 12px; }
.nav-username { font-size: 13px; color: var(--text-secondary); font-weight: 500; }

.theme-toggle-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: var(--radius-sm); border: 1px solid var(--border-default);
  background: var(--bg-subtle); font-size: 16px; cursor: pointer;
  transition: all 0.25s; flex-shrink: 0;
}
.theme-toggle-btn:hover { border-color: var(--c-indigo-400); background: rgba(99,102,241,0.08); transform: scale(1.05); }

/* ============================================ */
/*   Page Container                             */
/* ============================================ */
.page-container {
  max-width: 880px; margin: 0 auto; padding: 32px 24px 80px;
  position: relative; z-index: 1;
}

.page-header {
  margin-bottom: 32px;
}
.page-title {
  font-size: 28px; font-weight: 800; letter-spacing: -0.5px;
  color: var(--text-primary); margin-bottom: 6px;
  display: flex; align-items: center; gap: 10px;
}
.page-subtitle {
  font-size: 14px; color: var(--text-tertiary);
}

/* ============================================ */
/*   Cards                                      */
/* ============================================ */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 36px 40px;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.3s, border-color 0.3s;
}
.card:hover { border-color: var(--border-default); }
.card + .card { margin-top: 20px; }

.card-elevated {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  box-shadow: var(--shadow-md);
}

/* ============================================ */
/*   Buttons                                    */
/* ============================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; font-size: 14px; font-weight: 600;
  border-radius: var(--radius-sm); border: 1px solid transparent;
  cursor: pointer; transition: all 0.2s; letter-spacing: 0.1px;
  white-space: nowrap; font-family: var(--font-sans);
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gradient-brand); color: #fff; border: none;
  box-shadow: 0 2px 8px rgba(99,102,241,0.25);
}
.btn-primary:hover {
  box-shadow: 0 4px 16px rgba(99,102,241,0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-subtle); color: var(--text-primary); border-color: var(--border-default);
}
.btn-secondary:hover { border-color: var(--border-strong); background: var(--bg-surface); }

.btn-ghost {
  background: transparent; color: var(--text-secondary); border-color: var(--border-subtle);
}
.btn-ghost:hover { border-color: var(--border-default); color: var(--text-primary); }

.btn-danger {
  background: #fef2f2; color: #dc2626; border-color: #fecaca;
}
.btn-danger:hover { background: #fee2e2; }

.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: var(--radius-md); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-icon { width: 38px; height: 38px; padding: 0; }

/* ============================================ */
/*   Form Inputs                                */
/* ============================================ */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block; font-size: 13px; font-weight: 600;
  color: var(--text-secondary); margin-bottom: 6px;
}
.form-input {
  width: 100%; padding: 11px 16px; font-size: 14px;
  border: 1px solid var(--border-default); border-radius: var(--radius-sm);
  background: var(--bg-input); color: var(--text-primary);
  transition: all 0.2s; font-family: var(--font-sans);
  outline: none;
}
.form-input:focus {
  border-color: var(--c-indigo-400);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}
.form-input::placeholder { color: var(--text-disabled); }
textarea.form-input { resize: vertical; min-height: 120px; line-height: 1.7; }

.form-select {
  width: 100%; padding: 11px 16px; font-size: 14px;
  border: 1px solid var(--border-default); border-radius: var(--radius-sm);
  background: var(--bg-input); color: var(--text-primary);
  font-family: var(--font-sans); cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 14px center;
  padding-right: 36px;
}
.form-select:focus { border-color: var(--c-indigo-400); outline: none; }

/* 表单分组 */
.form-section {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-subtle);
}
.form-section:first-of-type { padding-top: 4px; }
.form-section:last-of-type { border-bottom: none; padding-bottom: 0; }
.form-section-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 14px;
}

/* 表单网格 */
.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 20px;
}
.form-grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px 20px;
}
.form-grid-2 .form-group,
.form-grid-3 .form-group { margin-bottom: 0; }

@media (max-width: 640px) {
  .form-grid-2 { grid-template-columns: 1fr; }
  .form-grid-3 { grid-template-columns: 1fr; }
}

/* Element Plus Collapse 定制 */
.el-collapse {
  --el-collapse-header-height: 44px;
  --el-collapse-border-color: var(--border-subtle);
  background: transparent;
  border: none;
}
.el-collapse-item__header {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 14px;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  padding: 0 14px;
  border: 1px solid var(--border-subtle);
}
.el-collapse-item__wrap {
  border: none;
  margin-top: 2px;
}
.el-collapse-item__content {
  padding-bottom: 0;
  color: var(--text-secondary);
}

/* ============================================ */
/*   Category System                            */
/* ============================================ */
.category-chips {
  display: flex; flex-wrap: wrap; gap: 8px;
}
.category-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 16px; font-size: 13px; font-weight: 500;
  border-radius: var(--radius-full); cursor: pointer;
  border: 1px solid var(--border-default);
  background: var(--bg-subtle); color: var(--text-secondary);
  transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
  white-space: nowrap;
}
.category-chip:hover { border-color: var(--border-strong); color: var(--text-primary); }
.category-chip.active {
  color: #fff; border-color: transparent;
  box-shadow: 0 4px 14px rgba(0,0,0,0.15);
  font-weight: 600;
}
.category-chip .chip-icon { font-size: 15px; }
.category-chip .chip-count { font-size: 11px; opacity: 0.8; }

.category-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border-radius: var(--radius-full);
  font-size: 11px; font-weight: 600; white-space: nowrap;
  border: 1px solid;
}

.category-filter-row {
  display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
  margin-bottom: 24px;
}
.category-filter-label {
  font-size: 13px; color: var(--text-tertiary); font-weight: 500; white-space: nowrap;
}

/* ============================================ */
/*   Sentence Cards (List View)                 */
/* ============================================ */
.sentence-list { display: flex; flex-direction: column; gap: 12px; }

.sentence-card {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 20px 24px; background: var(--bg-surface);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  transition: all 0.25s; position: relative;
}
.sentence-card:hover {
  border-color: var(--border-default);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.sentence-card .sentence-index {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--bg-subtle); display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: var(--text-tertiary); flex-shrink: 0; margin-top: 2px;
}
.sentence-card .sentence-content { flex:1; min-width:0; }
.sentence-card .sentence-text {
  font-size: 15px; line-height: 1.7; color: var(--text-primary); margin-bottom: 8px;
  word-break: break-word;
}
.sentence-card .sentence-meta {
  display: flex; gap: 12px; flex-wrap: wrap; align-items: center;
  font-size: 12px; color: var(--text-tertiary);
}
.sentence-card .sentence-actions {
  display: flex; gap: 6px; flex-shrink: 0; margin-top: 2px;
}
.sentence-card .cefr-badge {
  display: inline-flex; align-items: center;
  padding: 2px 8px; font-size: 11px; font-weight: 700;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
}
.sentence-card .sentence-extra {
  margin-top: 12px; padding: 12px 14px;
  background: var(--bg-subtle);
  border-radius: var(--radius-sm);
  font-size: 13px; color: var(--text-secondary); line-height: 1.6;
}
.sentence-card .sentence-extra .extra-line { margin-bottom: 6px; }
.sentence-card .sentence-extra .extra-line:last-child { margin-bottom: 0; }

/* ============================================ */
/*   Empty State                                */
/* ============================================ */
.empty-state {
  text-align: center; padding: 64px 24px;
}
.empty-state .empty-icon { font-size: 56px; margin-bottom: 16px; opacity: 0.6; }
.empty-state .empty-title { font-size: 18px; font-weight: 600; color: var(--text-secondary); margin-bottom: 6px; }
.empty-state .empty-desc { font-size: 14px; color: var(--text-tertiary); }

/* ============================================ */
/*   Stats Grid                                 */
/* ============================================ */
.stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px,1fr)); gap: 16px;
}
.stat-card {
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); padding: 24px; text-align: center;
  box-shadow: var(--shadow-xs); transition: all 0.25s;
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-card .stat-value {
  font-size: 32px; font-weight: 800; letter-spacing: -1px;
  background: var(--gradient-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 4px;
}
.stat-card .stat-label { font-size: 13px; color: var(--text-tertiary); font-weight: 500; }

/* ============================================ */
/*   Auth Page                                  */
/* ============================================ */
.auth-wrapper {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  padding: 24px; position: relative; z-index: 1;
}
.auth-card {
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl); padding: 48px 44px; width: 100%; max-width: 440px;
  box-shadow: var(--shadow-xl); position: relative; overflow: hidden;
}
.auth-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 4px; background: var(--gradient-brand);
}
.auth-logo { text-align: center; font-size: 44px; margin-bottom: 8px; }
.auth-title {
  text-align: center; font-size: 26px; font-weight: 800; letter-spacing: -0.4px;
  color: var(--text-primary); margin-bottom: 4px;
}
.auth-subtitle { text-align: center; font-size: 14px; color: var(--text-tertiary); margin-bottom: 32px; }

.auth-tabs { display: flex; margin-bottom: 28px; gap: 4px; background: var(--bg-subtle); border-radius: var(--radius-sm); padding: 4px; }
.auth-tab {
  flex:1; text-align:center; padding: 10px; font-size: 14px; font-weight: 600;
  border-radius: var(--radius-xs); cursor: pointer; transition: all 0.2s;
  color: var(--text-tertiary);
}
.auth-tab.active { background: var(--bg-surface); color: var(--text-primary); box-shadow: var(--shadow-xs); }

/* ============================================ */
/*   Study Page                                 */
/* ============================================ */
.study-container { max-width: 720px; margin: 0 auto; padding: 32px 24px 80px; position: relative; z-index: 1; }

.study-card {
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg); padding: 40px; box-shadow: var(--shadow-card);
}
.study-progress { display: flex; align-items: center; gap: 12px; margin-bottom: 28px; }
.study-progress .el-progress { flex: 1; }
.study-progress-text { font-size: 13px; color: var(--text-tertiary); font-weight: 500; white-space: nowrap; }

.voice-bar {
  display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px;
  padding: 16px; background: var(--bg-subtle); border-radius: var(--radius-md);
}

.answer-box {
  margin: 24px 0; padding: 20px 24px;
  background: linear-gradient(135deg, rgba(99,102,241,0.04), rgba(139,92,246,0.04));
  border-left: 4px solid var(--c-indigo-500); border-radius: var(--radius-sm);
  font-size: 17px; line-height: 1.8; color: var(--text-primary);
  animation: slideIn 0.35s ease;
}
.answer-box .label { font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: 0.8px; color: var(--c-indigo-500); margin-bottom: 8px; display: block; }

.sentence-display {
  font-size: 20px; font-weight: 600; color: var(--text-primary); line-height: 1.7;
  padding: 18px 24px; margin-bottom: 24px;
  background: var(--bg-subtle); border-radius: var(--radius-md);
  text-align: center; letter-spacing: 0.3px; position: relative;
}
.sentence-display .cat-tag {
  position: absolute; top: -10px; left: 20px;
}

.action-bar { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }

@keyframes slideIn {
  from { opacity:0; transform: translateY(8px); }
  to   { opacity:1; transform: translateY(0); }
}

/* ============================================ */
/*   Input Page                                 */
/* ============================================ */
.upload-zone {
  border: 2px dashed var(--border-default); border-radius: var(--radius-md);
  padding: 40px; text-align: center; cursor: pointer; transition: all 0.25s;
  background: var(--bg-subtle);
}
.upload-zone:hover { border-color: var(--c-indigo-400); background: rgba(99,102,241,0.03); }
.upload-zone .upload-icon { font-size: 40px; margin-bottom: 12px; }
.upload-zone .upload-text { font-size: 15px; font-weight: 600; color: var(--text-secondary); }
.upload-zone .upload-hint { font-size: 13px; color: var(--text-tertiary); margin-top: 4px; }

/* ============================================ */
/*   Community Home (index.html)                */
/* ============================================ */
/* Hero */
.community-hero {
  position: relative; min-height: 88vh; display: flex; align-items: center;
  justify-content: center; overflow: hidden;
  background: linear-gradient(160deg, #0f172a 0%, #1e1b4b 40%, #312e81 70%, #1e1b4b 100%);
}
[data-theme="light"] .community-hero {
  background: linear-gradient(160deg, #eef2ff 0%, #e0e7ff 30%, #f5f3ff 60%, #faf5ff 100%);
}
[data-theme="light"] .community-hero .hero-title { color: var(--c-gray-900); }
[data-theme="light"] .community-hero .hero-subtitle { color: var(--c-gray-600); }
[data-theme="light"] .community-hero .hero-badge {
  background: rgba(99,102,241,0.08); border-color: rgba(99,102,241,0.2); color: var(--c-indigo-600);
}
[data-theme="light"] .community-hero .hero-btn-secondary {
  background: var(--c-white); border-color: var(--c-gray-200); color: var(--c-gray-700);
}
[data-theme="light"] .community-hero .hero-btn-secondary:hover { background: var(--c-gray-50); }

.community-hero::before {
  content: ''; position: absolute;
  top: -40%; left: -30%; width: 160%; height: 180%;
  background:
    radial-gradient(ellipse at 25% 40%, rgba(99,102,241,0.12) 0%, transparent 55%),
    radial-gradient(ellipse at 70% 60%, rgba(139,92,246,0.14) 0%, transparent 55%),
    radial-gradient(ellipse at 45% 20%, rgba(244,114,182,0.08) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite;
}
@keyframes heroGlow {
  0%,100% { transform: translate(0,0) scale(1); }
  33% { transform: translate(1%,-1%) scale(1.02); }
  66% { transform: translate(-1%,1%) scale(0.98); }
}

.hero-particles { position: absolute; inset: 0; pointer-events: none; }
.hero-particle {
  position: absolute; border-radius: 50%;
  background: rgba(255,255,255,0.08);
  animation: particleFloat linear infinite;
}
[data-theme="light"] .hero-particle { background: rgba(99,102,241,0.06); }
@keyframes particleFloat {
  0%  { transform: translateY(100vh) scale(0); opacity:0; }
  10% { opacity:0.8; }
  90% { opacity:0.8; }
  100%{ transform: translateY(-10vh) scale(1.2); opacity:0; }
}

.hero-content { position: relative; z-index:2; text-align: center; padding:0 32px; max-width: 860px; }

.hero-badge {
  display: inline-block; padding: 8px 24px;
  border: 1px solid rgba(255,255,255,0.2); border-radius: var(--radius-full);
  color: rgba(255,255,255,0.9); font-size: 13px; font-weight: 600;
  letter-spacing: 1.5px; margin-bottom: 28px;
  animation: fadeInDown 0.7s ease;
}

.hero-title {
  font-size: clamp(36px, 6vw, 60px); font-weight: 800;
  color: #fff; line-height: 1.18; margin-bottom: 18px;
  letter-spacing: -1px;
  animation: fadeInUp 0.7s ease 0.12s both;
}
.hero-title .highlight {
  background: linear-gradient(135deg, #818cf8, #a78bfa, #f472b6);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero-subtitle {
  font-size: clamp(15px, 2.2vw, 18px); color: rgba(255,255,255,0.65);
  line-height: 1.7; max-width: 560px; margin: 0 auto 36px;
  animation: fadeInUp 0.7s ease 0.25s both;
}

.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; animation: fadeInUp 0.7s ease 0.38s both; }
.hero-btn-primary {
  padding: 15px 38px; font-size: 16px; font-weight: 700; color: #fff;
  background: linear-gradient(135deg, #6366f1, #8b5cf6); border: none;
  border-radius: var(--radius-full); cursor: pointer; transition: all 0.3s;
  box-shadow: 0 8px 28px rgba(99,102,241,0.4); letter-spacing: 0.5px;
}
.hero-btn-primary:hover { transform: translateY(-3px); box-shadow: 0 14px 40px rgba(99,102,241,0.55); }
.hero-btn-secondary {
  padding: 15px 38px; font-size: 16px; font-weight: 700;
  color: rgba(255,255,255,0.85); background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2); border-radius: var(--radius-full);
  cursor: pointer; transition: all 0.3s; letter-spacing: 0.5px;
}
.hero-btn-secondary:hover { background: rgba(255,255,255,0.15); transform: translateY(-3px); }

.hero-scroll-hint {
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  color: rgba(255,255,255,0.3); font-size: 28px; cursor: pointer; z-index: 2;
  animation: scrollBounce 2s ease-in-out infinite;
}
[data-theme="light"] .hero-scroll-hint { color: rgba(0,0,0,0.2); }
@keyframes scrollBounce {
  0%,100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* Stats Bar */
.community-stats-bar {
  background: var(--bg-overlay); backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px); border-bottom: 1px solid var(--border-subtle);
  position: sticky; top: 60px; z-index: 999;
}
.stats-bar-inner {
  max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-around;
  padding: 18px 24px;
}
.stat-item { text-align: center; }
.stat-number {
  font-size: 28px; font-weight: 800; letter-spacing: -0.5px;
  background: var(--gradient-brand); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  line-height: 1.2;
}
.stat-unit { font-size: 16px; font-weight: 700; }
.stat-label { font-size: 12px; color: var(--text-tertiary); margin-top: 2px; font-weight: 500; }
.stat-divider { width: 1px; background: var(--border-subtle); align-self: center; height: 36px; }

/* Main Content */
.community-main { max-width: 1100px; margin: 0 auto; padding: 48px 24px 80px; position: relative; z-index: 1; }

.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
.section-title {
  font-size: 22px; font-weight: 700; color: var(--text-primary);
  display: flex; align-items: center; gap: 10px; letter-spacing: -0.3px;
}
.section-title .title-icon { font-size: 26px; }
.section-more { font-size: 13px; color: var(--c-indigo-500); font-weight: 600; transition: color 0.2s; }
.section-more:hover { color: var(--c-indigo-600); }

/* Daily Pick */
.daily-pick-card {
  background: linear-gradient(135deg, #1e1b4b, #312e81);
  border-radius: var(--radius-lg); padding: 44px 40px;
  position: relative; overflow: hidden; margin-bottom: 48px;
}
[data-theme="light"] .daily-pick-card { background: linear-gradient(135deg, #1e1b4b, #312e81); }
.daily-pick-card::before {
  content: ''; position: absolute; top: -120px; right: -80px;
  width: 320px; height: 320px; border-radius: 50%;
  background: radial-gradient(circle, rgba(129,140,248,0.18) 0%, transparent 70%);
}
.daily-pick-card::after {
  content: ''; position: absolute; bottom: -100px; left: -60px;
  width: 260px; height: 260px; border-radius: 50%;
  background: radial-gradient(circle, rgba(167,139,250,0.14) 0%, transparent 70%);
}
.daily-pick-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(251,191,36,0.15); border: 1px solid rgba(251,191,36,0.3);
  color: #fbbf24; padding: 6px 16px; border-radius: var(--radius-full);
  font-size: 12px; font-weight: 700; margin-bottom: 20px; position: relative; z-index: 1;
}
.daily-pick-content {
  font-size: 26px; font-weight: 600; color: #fff; line-height: 1.6;
  margin-bottom: 22px; position: relative; z-index: 1; font-style: italic;
}
.daily-pick-chinese {
  font-size: 15px; color: rgba(255,255,255,0.55); line-height: 1.6;
  margin-bottom: 18px; position: relative; z-index: 1;
}
.daily-pick-meta { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; position: relative; z-index: 1; }
.daily-pick-author { display: flex; align-items: center; gap: 8px; color: rgba(255,255,255,0.7); font-size: 13px; }
.daily-pick-author .avatar {
  width: 30px; height: 30px; border-radius: 50%; background: rgba(255,255,255,0.1);
  display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.daily-pick-stats { display: flex; gap: 14px; color: rgba(255,255,255,0.5); font-size: 12px; }
.daily-pick-btn {
  margin-left: auto; padding: 10px 26px; background: linear-gradient(135deg,#6366f1,#8b5cf6);
  color: #fff; border: none; border-radius: var(--radius-full); font-weight: 600; font-size: 13px;
  cursor: pointer; transition: all 0.3s;
}
.daily-pick-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(99,102,241,0.4); }

/* Sentence Grid */
.sentence-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; margin-bottom: 48px; }

.sentence-grid-card {
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); padding: 22px; transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
  position: relative; display: flex; flex-direction: column;
}
.sentence-grid-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--c-indigo-300); }

.card-rank-badge {
  position: absolute; top: -10px; right: 14px; width: 34px; height: 34px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px; color: #fff;
  background: linear-gradient(135deg,#fbbf24,#f59e0b);
  box-shadow: 0 3px 10px rgba(245,158,11,0.4);
}
.card-rank-badge.silver { background: linear-gradient(135deg,#c0c0c0,#909090); box-shadow:0 3px 10px rgba(144,144,144,0.4); }
.card-rank-badge.bronze { background: linear-gradient(135deg,#cd7f32,#a0522d); box-shadow:0 3px 10px rgba(205,127,50,0.4); }

.card-content {
  font-size: 14px; line-height: 1.65; color: var(--text-primary); flex:1;
  margin-bottom: 14px; display: -webkit-box; -webkit-line-clamp:4; -webkit-box-orient:vertical; overflow:hidden;
}
.card-chinese {
  font-size: 12px; line-height: 1.5; color: var(--text-tertiary);
  margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;
}
.card-tags { display: flex; gap: 5px; flex-wrap: wrap; margin-bottom: 10px; }
.card-tag {
  padding: 2px 9px; border-radius: var(--radius-full); font-size: 10px; font-weight: 600;
  background: rgba(99,102,241,var(--cat-bg-opacity)); color: var(--c-indigo-500);
  border: 1px solid rgba(99,102,241,var(--cat-border-opacity));
}
.card-footer {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 10px; border-top: 1px solid var(--border-subtle);
}
.card-author { display: flex; align-items: center; gap: 5px; font-size: 12px; color: var(--text-tertiary); }
.card-author .avatar { font-size: 15px; }
.card-stats { display: flex; gap: 10px; font-size: 11px; color: var(--text-tertiary); }
.card-time { font-size: 11px; color: var(--text-disabled); }

/* Hot Ranking */
.hot-ranking { margin-bottom: 48px; }
.hot-list { display: flex; flex-direction: column; gap: 10px; }
.hot-item {
  display: flex; align-items: center; gap: 14px; padding: 18px 22px;
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); transition: all 0.25s;
}
.hot-item:hover { transform: translateX(4px); box-shadow: var(--shadow-md); border-color: var(--border-default); }

.hot-rank {
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 16px; color: #fff; flex-shrink: 0;
}
.hot-rank.r1 { background: linear-gradient(135deg,#fbbf24,#f59e0b); }
.hot-rank.r2 { background: linear-gradient(135deg,#c0c0c0,#909090); }
.hot-rank.r3 { background: linear-gradient(135deg,#cd7f32,#a0522d); }
.hot-rank.rn { background: var(--bg-subtle); color: var(--text-tertiary); }

.hot-content { flex:1; min-width:0; }
.hot-text { font-size: 14px; color: var(--text-primary); font-weight: 500; line-height: 1.5; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.hot-meta { display: flex; gap: 14px; margin-top: 3px; font-size: 12px; color: var(--text-tertiary); }
.hot-count { display: flex; align-items: center; gap: 5px; font-size: 14px; font-weight: 700; color: var(--c-indigo-500); white-space: nowrap; flex-shrink: 0; }

/* Contributors */
.contributor-section { margin-bottom: 48px; }
.contributor-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; }
.contributor-card {
  background: var(--bg-surface); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); padding: 26px 18px; text-align: center;
  transition: all 0.25s; position: relative;
}
.contributor-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.contributor-rank {
  position: absolute; top: 12px; left: 12px; width: 26px; height: 26px;
  border-radius: var(--radius-xs); display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 13px; color: #fff;
}
.contributor-rank.cr1 { background: linear-gradient(135deg,#fbbf24,#f59e0b); }
.contributor-rank.cr2 { background: linear-gradient(135deg,#c0c0c0,#909090); }
.contributor-rank.cr3 { background: linear-gradient(135deg,#cd7f32,#a0522d); }

.contributor-avatar {
  width: 56px; height: 56px; border-radius: 50%; margin: 0 auto 12px;
  background: var(--bg-subtle); display: flex; align-items: center; justify-content: center; font-size: 28px;
}
.contributor-name { font-size: 15px; font-weight: 600; color: var(--text-primary); margin-bottom: 3px; }
.contributor-bio { font-size: 11px; color: var(--text-tertiary); margin-bottom: 8px; }
.contributor-stat { font-size: 12px; color: var(--c-indigo-500); font-weight: 600; }

/* Footer */
.community-footer {
  background: var(--c-gray-900); padding: 40px 24px; text-align: center; position: relative; z-index: 1;
}
[data-theme="light"] .community-footer { background: var(--c-gray-900); }
.footer-brand { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 6px; }
.footer-desc { color: rgba(255,255,255,0.45); font-size: 13px; margin-bottom: 14px; }
.footer-links { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.footer-link { color: rgba(255,255,255,0.4); font-size: 12px; transition: color 0.2s; }
.footer-link:hover { color: rgba(255,255,255,0.7); }

/* ============================================ */
/*   Element Plus Overrides                     */
/* ============================================ */

/* General form dark-mode fix */
[data-theme="dark"] .el-input__wrapper,
[data-theme="dark"] .el-textarea__inner,
[data-theme="dark"] .el-select .el-input__wrapper {
  background-color: var(--bg-input) !important;
  border-color: var(--border-default) !important;
  box-shadow: none !important;
}
[data-theme="dark"] .el-input__inner,
[data-theme="dark"] .el-textarea__inner { color: var(--text-primary) !important; }
[data-theme="dark"] .el-input__inner::placeholder,
[data-theme="dark"] .el-textarea__inner::placeholder { color: var(--text-disabled) !important; }

[data-theme="dark"] .el-select-dropdown {
  background: var(--bg-elevated) !important;
  border-color: var(--border-default) !important;
}
[data-theme="dark"] .el-select-dropdown__item { color: var(--text-primary) !important; }
[data-theme="dark"] .el-select-dropdown__item.hover,
[data-theme="dark"] .el-select-dropdown__item:hover { background: var(--bg-subtle) !important; }
[data-theme="dark"] .el-select-dropdown__item.selected { color: var(--c-indigo-400) !important; }

[data-theme="dark"] .el-dialog { background: var(--bg-elevated) !important; border: 1px solid var(--border-subtle) !important; border-radius: var(--radius-lg) !important; }
[data-theme="dark"] .el-dialog__title { color: var(--text-primary) !important; }
[data-theme="dark"] .el-message-box { background: var(--bg-elevated) !important; border-color: var(--border-subtle) !important; border-radius: var(--radius-lg) !important; }
[data-theme="dark"] .el-message-box__title { color: var(--text-primary) !important; }
[data-theme="dark"] .el-message-box__message { color: var(--text-secondary) !important; }
[data-theme="dark"] .el-radio__label,
[data-theme="dark"] .el-checkbox__label { color: var(--text-secondary) !important; }
[data-theme="dark"] .el-switch__label { color: var(--text-tertiary) !important; }

[data-theme="dark"] .el-pagination button,
[data-theme="dark"] .el-pagination .el-pager li { color: var(--text-secondary) !important; background: transparent !important; }
[data-theme="dark"] .el-pagination .el-pager li.active { background: var(--gradient-brand) !important; color: #fff !important; border-radius: var(--radius-xs) !important; }

/* Focus ring — unified */
.el-input__wrapper:focus, .el-input__wrapper.is-focus,
.el-textarea__inner:focus {
  border-color: var(--c-indigo-400) !important;
  box-shadow: 0 0 0 3px rgba(99,102,241,0.1) !important;
}

/* Buttons style override */
.el-button--primary {
  background: var(--gradient-brand) !important; border: none !important;
  box-shadow: 0 2px 8px rgba(99,102,241,0.25) !important;
}
.el-button--primary:hover { box-shadow: 0 4px 16px rgba(99,102,241,0.35) !important; }

/* Tags */
.el-tag { border-radius: var(--radius-full) !important; font-weight: 500 !important; }

/* ============================================ */
/*   Translation Display                        */
/* ============================================ */
.translation-block {
  margin: 16px 0;
  padding: 14px 18px;
  background: rgba(99, 102, 241, 0.04);
  border-left: 3px solid var(--c-indigo-400);
  border-radius: var(--radius-sm);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
}
.translation-block .tl-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-indigo-400);
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}
[data-theme="dark"] .translation-block {
  background: rgba(99, 102, 241, 0.08);
}

.sentence-card .translation-inline {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border-subtle);
  font-size: 13px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

/* ============================================ */
/*   Voice Toggle (Male / Female)               */
/* ============================================ */
.voice-toggle-group {
  display: inline-flex;
  background: var(--bg-subtle);
  border-radius: var(--radius-full);
  padding: 3px;
  gap: 2px;
}
.voice-toggle-btn {
  padding: 6px 16px;
  border: none;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  background: transparent;
  color: var(--text-tertiary);
  transition: all 0.2s ease;
  white-space: nowrap;
  font-family: inherit;
}
.voice-toggle-btn:hover {
  color: var(--text-primary);
}
.voice-toggle-btn.active {
  background: var(--c-indigo-500);
  color: #fff;
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
}

/* ============================================ */
/*   Animations                                 */
/* ============================================ */
@keyframes fadeInDown { from{opacity:0;transform:translateY(-24px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeInUp   { from{opacity:0;transform:translateY(24px)}  to{opacity:1;transform:translateY(0)} }
@keyframes fadeIn     { from{opacity:0} to{opacity:1} }
@keyframes scaleIn    { from{opacity:0;transform:scale(0.94)} to{opacity:1;transform:scale(1)} }

.fade-in { animation: fadeIn 0.35s ease; }

/* ============================================ */
/*   Skeleton                                   */
/* ============================================ */
.skeleton {
  background: linear-gradient(90deg, var(--bg-subtle) 25%, var(--border-subtle) 50%, var(--bg-subtle) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-xs);
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================ */
/*   Responsive                                 */
/* ============================================ */
@media (max-width: 1024px) {
  .sentence-grid { grid-template-columns: repeat(2,1fr); }
  .contributor-grid { grid-template-columns: repeat(2,1fr); }
}
@media (max-width: 768px) {
  .nav-bar { padding: 0 16px; height: auto; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; }
  .nav-bar .nav-links { order:3; width:100%; justify-content: center; margin-top: 8px; flex-wrap: wrap; }
  .page-container { padding: 24px 16px 60px; }
  .card { padding: 24px 20px; }
  .study-card { padding: 24px 20px; }
  .auth-card { padding: 36px 24px; }
  .sentence-grid { grid-template-columns: 1fr; }
  .contributor-grid { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2,1fr); }
  .stats-bar-inner { flex-wrap: wrap; gap: 14px; }
  .stat-divider { display: none; }
  .daily-pick-card { padding: 28px 20px; }
  .daily-pick-content { font-size: 20px; }
  .daily-pick-meta { flex-direction: column; align-items: flex-start; }
  .daily-pick-btn { margin-left: 0; }
  .community-hero { min-height: 78vh; }
  .hot-item { padding: 14px 16px; }
}