/* ===== Dashboard Style — Java Interview Mastery ===== */
:root {
  --bg: #f0f2f5;
  --white: #ffffff;
  --dark: #2c3e50;
  --darker: #1a2332;
  --text: #333333;
  --text2: #666666;
  --text3: #999999;
  --blue: #4A90D9;
  --green: #27ae60;
  --orange: #e67e22;
  --red: #e74c3c;
  --border: #e0e0e0;
  --hover: #f7f9fc;
  --pill-bg: #f0f0f0;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 8px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{font-family:var(--font);font-size:14px;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden;min-height:100vh;}
a{color:var(--blue);text-decoration:none;}
button{font-family:var(--font);cursor:pointer;border:none;background:none;}

/* ===== TOP BAR ===== */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  height:56px;padding:0 24px;
  background:#2f3542;
  color:#fff;position:sticky;top:0;z-index:100;
  box-shadow:0 2px 8px rgba(0,0,0,0.15);
}
.topbar__left{display:flex;align-items:center;gap:12px;}
.topbar__logo-link{text-decoration:none;display:flex;align-items:center;gap:12px;}
.topbar__logo{
  width:34px;height:34px;border-radius:50%;
  background:#FF0000;color:#fff;
  display:grid;place-items:center;
  font-size:18px;cursor:pointer;
  transition:transform 0.2s, box-shadow 0.2s;
  animation:coffeeGlow 2s ease infinite;
}
@keyframes coffeeGlow{
  0%,100%{box-shadow:0 0 8px rgba(255,0,0,0.3),0 0 0 0 rgba(255,0,0,0);}
  50%{box-shadow:0 0 15px rgba(255,0,0,0.5),0 0 25px rgba(255,0,0,0.2);}
}
.topbar__logo-link:hover .topbar__logo{transform:scale(1.1);box-shadow:0 0 0 3px rgba(255,0,0,0.3);}
.topbar__brand{font-size:16px;font-weight:700;letter-spacing:-0.3px;color:#fff;}
.topbar__right{display:flex;align-items:center;gap:16px;}
.topbar__search{position:relative;display:flex;align-items:center;}
.topbar__search input{
  width:240px;height:34px;border:none;border-radius:6px;
  padding:0 36px 0 12px;font-size:13px;font-family:var(--font);
  background:rgba(255,255,255,0.15);color:#fff;outline:none;
  transition:all 0.2s;
}
.topbar__search input::placeholder{color:rgba(255,255,255,0.5);}
.topbar__search input:focus{background:rgba(255,255,255,0.25);width:300px;}
.topbar__search kbd{
  position:absolute;right:8px;font-size:10px;color:rgba(255,255,255,0.4);
  border:1px solid rgba(255,255,255,0.2);border-radius:3px;padding:1px 5px;
}
.topbar__visitor{font-size:13px;background:rgba(255,255,255,0.15);padding:4px 12px;border-radius:12px;display:flex;align-items:center;gap:5px;}
.topbar__live{font-size:12px;background:rgba(39,174,96,0.2);padding:4px 12px;border-radius:12px;display:flex;align-items:center;gap:6px;color:#7dffb3;}
.live-dot{width:8px;height:8px;border-radius:50%;background:#2ecc71;animation:pulse 2s infinite;}
@keyframes pulse{0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(46,204,113,0.5);}50%{opacity:0.7;box-shadow:0 0 0 6px rgba(46,204,113,0);}}

/* ===== PAGE ===== */
.page{max-width:1200px;margin:0 auto;padding:24px;}
.page__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px;}
.page__header h1{font-size:28px;font-weight:800;color:var(--dark);}
.page__actions{display:flex;gap:8px;}

/* Breadcrumb pills */
.crumb{display:flex;align-items:center;gap:8px;margin-bottom:16px;font-size:15px;color:var(--text3);font-weight:500;}
.crumb a{color:var(--blue);cursor:pointer;font-weight:600;}
.crumb a:hover{text-decoration:underline;}

/* ===== TABLE ===== */
.tbl{width:100%;border-collapse:separate;border-spacing:0;background:var(--white);border-radius:12px;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,0.06);}
.tbl thead th{
  background:linear-gradient(135deg,#2f3542,#3d4f65);color:#fff;font-size:11px;font-weight:700;
  text-transform:uppercase;letter-spacing:0.8px;padding:14px 16px;
  text-align:left;border:none;white-space:nowrap;
}
.tbl tbody tr{transition:all 0.15s;cursor:pointer;}
.tbl tbody tr:nth-child(even){background:#f9fafb;}
.tbl tbody tr:hover{background:#fff5f5;transform:translateX(2px);}
.tbl tbody td{padding:16px 18px;border-bottom:1px solid #f0f0f0;font-size:15px;vertical-align:middle;}
.tbl tbody tr:last-child td{border-bottom:none;}

/* Pills / Badges */
.pill{
  display:inline-block;font-size:11px;font-weight:600;padding:4px 12px;
  border-radius:20px;white-space:nowrap;
}
.pill--blue{background:#eef2ff;color:#4338ca;}
.pill--green{background:#ecfdf5;color:#059669;}
.pill--orange{background:#fff7ed;color:#ea580c;}
.pill--gray{background:#f3f4f6;color:#6b7280;}
.pill--red{background:#fef2f2;color:#dc2626;}
.pill--dark{background:#2f3542;color:#fff;}

.badge{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:28px;height:28px;border-radius:8px;font-size:12px;
  font-weight:700;padding:0 8px;
}
.badge--num{background:linear-gradient(135deg,#2f3542,#3d4f65);color:#fff;}

/* ===== BUTTONS ===== */
.btn{
  display:inline-flex;align-items:center;gap:6px;
  font-size:13px;font-weight:600;padding:6px 14px;
  border-radius:20px;transition:all 0.2s;
}
.btn--outline{border:1.5px solid var(--dark);color:var(--dark);background:var(--white);}
.btn--outline:hover{background:var(--dark);color:#fff;}
.btn--primary{background:var(--blue);color:#fff;border:none;}
.btn--primary:hover{background:#3a7bd5;}
.btn--green{background:var(--green);color:#fff;border:none;}
.btn--green:hover{background:#219a52;}
.btn--sm{padding:5px 12px;font-size:12px;border-radius:4px;}

/* ===== CUSTOM DROPDOWN ===== */
.cdd{position:relative;margin-bottom:20px;}
.cdd__btn{width:100%;display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border:1.5px solid #d1d5db;border-radius:10px;background:#fff;font-family:var(--font);font-size:14px;color:#333;cursor:pointer;transition:all 0.2s;text-align:left;}
.cdd__btn:hover{border-color:#FF0000;box-shadow:0 2px 8px rgba(255,0,0,0.08);}
.cdd__btn-text{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600;}
.cdd__arrow{font-size:16px;color:#999;flex-shrink:0;margin-left:12px;transition:transform 0.2s;}
.cdd__list{position:absolute;top:calc(100% + 4px);left:0;right:0;z-index:50;background:#fff;border:1.5px solid #d1d5db;border-radius:10px;box-shadow:0 8px 30px rgba(0,0,0,0.12);max-height:400px;overflow-y:auto;}
.cdd__item{display:flex;align-items:flex-start;gap:10px;padding:14px 18px;cursor:pointer;transition:background 0.12s;border-bottom:1px solid #f3f3f3;}
.cdd__item:last-child{border-bottom:none;}
.cdd__item:hover{background:#f0f6ff;}
.cdd__item--active{background:#fff0f0;border-left:3px solid #FF0000;}
.cdd__num{width:24px;height:24px;border-radius:6px;background:#f0f2f5;display:grid;place-items:center;font-size:12px;font-weight:700;color:#666;flex-shrink:0;margin-top:1px;}
.cdd__item--active .cdd__num{background:#FF0000;color:#fff;}
.cdd__id{font-weight:700;color:#FF0000;flex-shrink:0;min-width:40px;margin-top:2px;}
.cdd__q{flex:1;color:#333;line-height:1.5;font-size:14px;}
.cdd__rev{font-size:13px;flex-shrink:0;margin-top:2px;}
/* Single question */
.qa-single{background:#fff;border-radius:10px;padding:24px;box-shadow:0 1px 4px rgba(0,0,0,0.06);margin-bottom:16px;}
.qa-single__id{font-size:13px;color:#999;margin-bottom:6px;}
.qa-single__q{font-size:20px;font-weight:800;color:var(--dark);line-height:1.4;margin-bottom:8px;}
.qa-single__body{margin-top:20px;}
.qnav-bottom{display:flex;align-items:center;justify-content:center;gap:16px;padding:16px 0;margin-top:8px;border-top:1px solid #e5e7eb;}
.qnav-pos{font-size:13px;color:#999;min-width:60px;text-align:center;}
.share-bottom{display:flex;justify-content:center;padding:12px 0 8px;}
/* ===== REVIEW BUTTON ===== */
.rev-btn{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font);font-size:13px;font-weight:600;
  padding:7px 16px;border-radius:20px;cursor:pointer;
  border:1.5px solid #d1d5db;background:#fff;color:#555;
  transition:all 0.25s ease;white-space:nowrap;
  position:relative;
}
.rev-btn:hover{
  border-color:#4A90D9;color:#4A90D9;background:#f0f6ff;
  transform:translateY(-1px);box-shadow:0 3px 10px rgba(74,144,217,0.15);
}
.rev-btn--done{
  border-color:#27ae60;background:#e6f4ea;color:#188038;
}
.rev-btn--done:hover{
  border-color:#c0392b;color:#c0392b;background:#fce8e6;
  box-shadow:0 3px 10px rgba(192,57,43,0.15);
}

/* ===== QA CARD (question + answer together) ===== */
.qa-card{background:var(--white);border-radius:var(--radius);box-shadow:0 1px 3px rgba(0,0,0,0.06);margin-bottom:20px;overflow:hidden;}
.qa-card__head{display:flex;align-items:flex-start;gap:10px;padding:16px 20px;background:#f8f9fa;border-bottom:1px solid var(--border);}
.qa-card__q{flex:1;font-size:15px;line-height:1.5;color:var(--dark);}
.qa-card__answer{padding:20px;}

/* ===== QUESTION ARTICLE ===== */
.article{background:var(--white);border-radius:var(--radius);padding:32px;box-shadow:0 1px 3px rgba(0,0,0,0.06);}
.article__id{font-size:12px;color:var(--text3);margin-bottom:6px;}
.article__title{font-size:22px;font-weight:800;line-height:1.35;color:var(--dark);margin-bottom:16px;}
.article__clap{margin-bottom:24px;}

.sec{margin:28px 0;padding:20px;border-radius:var(--radius);background:#f8fafc;border-left:4px solid var(--blue);}
.sec--green{border-left-color:var(--green);background:#f7fdf7;}
.sec--orange{border-left-color:var(--orange);background:#fffcf5;}
.sec--code{border-left-color:#6366f1;background:#fafaff;}
.sec__head{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:0.6px;color:var(--blue);margin-bottom:10px;display:flex;align-items:center;gap:8px;}
.sec--green .sec__head{color:var(--green);}
.sec--orange .sec__head{color:var(--orange);}
.sec--code .sec__head{color:#6366f1;}
.sec p{margin:8px 0;line-height:1.7;font-size:15px;}
.sec ul,.sec ol{margin:8px 0 8px 20px;line-height:1.7;}
.sec li{margin:4px 0;}
.sec strong{font-weight:700;}
.sec h4{font-size:15px;font-weight:700;margin:16px 0 8px;color:var(--dark);}

.def-oneliner{background:#e6f4ea;border-radius:6px;padding:12px 16px;margin:12px 0;font-weight:700;color:#188038;font-size:14px;border-left:3px solid #27ae60;line-height:1.6;}
.def-oneliner::before{content:"💡 ";}
.def-analogy{font-style:italic;color:var(--text2);margin:8px 0;padding:10px 16px;background:#fef9f0;border-radius:6px;border-left:3px solid var(--orange);}
.takeaway{background:#e6f4ea;border-radius:6px;padding:16px 20px;border-left:4px solid var(--green);}
.takeaway p{margin:6px 0;}

/* Code */
pre{font-family:'JetBrains Mono',monospace;font-size:13px;line-height:1.6;background:#fafbfc;color:#24292e;padding:16px;border-radius:6px;overflow-x:auto;margin:12px 0;border:1px solid #e1e4e8;}
pre code{font-family:inherit;background:none;border:none;padding:0;font-size:inherit;color:inherit;}
code{font-family:'JetBrains Mono',monospace;font-size:0.88em;background:#fff0f0;color:#c7254e;border-radius:3px;padding:2px 6px;font-weight:500;}
.code-wrap{margin:12px 0;border-radius:8px;overflow:hidden;border:1px solid #d1d5db;background:#fafbfc;}
.code-bar{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;background:#f3f4f6;font-size:12px;color:#6b7280;border-bottom:1px solid #e5e7eb;}
.copy-btn{font-size:11px;color:#6b7280;background:#fff;border:1px solid #d1d5db;border-radius:4px;padding:3px 10px;cursor:pointer;transition:all 0.15s;}
.copy-btn:hover{background:#4A90D9;color:#fff;border-color:#4A90D9;}
.diagram-wrap{margin:12px 0;border:1px solid #d1d5db;border-radius:8px;overflow:hidden;background:#f8faff;}
.diagram-bar{padding:8px 14px;background:#eef2ff;font-size:12px;font-weight:700;color:#4A90D9;border-bottom:1px solid #d1d5db;}
.diagram-art{font-family:'JetBrains Mono',monospace;font-size:12px;line-height:1.45;padding:16px;white-space:pre;overflow-x:auto;color:#4338ca;background:#fafaff;}

.tk-kw{color:#d73a49;}.tk-ty{color:#6f42c1;}.tk-str{color:#22863a;}.tk-num{color:#005cc5;}.tk-cm{color:#6a737d;font-style:italic;}.tk-fn{color:#e36209;}.tk-an{color:#6f42c1;}

/* ===== BOTTOM NAV ===== */
.qnav{position:fixed;bottom:0;left:0;right:0;z-index:90;background:var(--white);border-top:1px solid var(--border);display:flex;align-items:center;justify-content:center;gap:16px;padding:10px;height:50px;}
.qnav__btn{font-size:13px;font-weight:600;color:var(--blue);background:none;border:1.5px solid var(--blue);border-radius:20px;padding:5px 16px;cursor:pointer;transition:all 0.2s;}
.qnav__btn:hover{background:var(--blue);color:#fff;}
.qnav__btn:disabled{opacity:0.3;cursor:default;}
.qnav__pos{font-size:12px;color:var(--text3);}

/* Loader */
.loader{display:flex;justify-content:center;padding:60px;}
.loader__spin{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--blue);border-radius:50%;animation:spin 0.7s linear infinite;}
@keyframes spin{to{transform:rotate(360deg);}}

/* Empty */
.empty{text-align:center;padding:60px 20px;color:var(--text3);}
.empty__icon{font-size:40px;margin-bottom:12px;}
.empty__title{font-size:16px;font-weight:600;color:var(--text2);}

mark{background:#fff3bf;border-radius:2px;padding:0 2px;}
mark.hl{background:#e8f0fe;color:#1967d2;border-radius:3px;padding:1px 4px;font-weight:600;font-size:0.95em;}
strong.kw{color:#1a2332;background:#f0f4ff;padding:1px 4px;border-radius:3px;font-weight:700;}
table{width:100%;border-collapse:collapse;margin:12px 0;font-size:13px;}
table th,table td{padding:8px 12px;text-align:left;border-bottom:1px solid #eee;}
table th{font-weight:700;background:#f8f8f8;}

/* ===== EMAIL POPUP ===== */
.popup-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.5);z-index:300;display:none;align-items:center;justify-content:center;backdrop-filter:blur(3px);}
.popup{background:#fff;border-radius:12px;padding:32px;max-width:420px;width:90%;text-align:center;position:relative;box-shadow:0 20px 60px rgba(0,0,0,0.2);animation:popIn 0.3s ease;}
@keyframes popIn{from{opacity:0;transform:scale(0.9) translateY(20px);}to{opacity:1;transform:none;}}
.popup__close{position:absolute;top:12px;right:12px;width:28px;height:28px;border:none;background:#f0f0f0;border-radius:50%;font-size:14px;cursor:pointer;color:#666;transition:all 0.15s;}
.popup__close:hover{background:#e0e0e0;color:#333;}
.popup__icon{font-size:40px;margin-bottom:12px;}
.popup__title{font-size:20px;font-weight:800;color:#1a2332;margin-bottom:8px;}
.popup__text{font-size:14px;color:#666;margin-bottom:20px;line-height:1.5;}
.popup__form{display:flex;gap:8px;}
.popup__form input{flex:1;height:42px;border:1.5px solid #ddd;border-radius:8px;padding:0 14px;font-size:14px;font-family:var(--font);outline:none;transition:border-color 0.2s;}
.popup__form input:focus{border-color:#4A90D9;}
.popup__form .btn{height:42px;padding:0 20px;border-radius:8px;font-size:14px;white-space:nowrap;}
.popup__msg{margin-top:12px;font-size:14px;font-weight:600;padding:8px;border-radius:6px;}
.popup__msg.ok{color:#188038;background:#e6f4ea;}
.popup__msg.err{color:#c5221f;background:#fce8e6;}
.popup__note{font-size:12px;color:#999;margin-top:16px;}
.popup__skip{display:inline-block;margin-top:12px;font-size:13px;color:#999;cursor:pointer;text-decoration:underline;}
.popup__skip:hover{color:#666;}

/* ===== SHARE BUTTONS ===== */
.share-bar{display:flex;align-items:center;gap:8px;margin:16px 0;flex-wrap:wrap;}
.share-bar__label{font-size:12px;font-weight:700;color:#999;text-transform:uppercase;letter-spacing:0.5px;}
.share-btn{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;padding:6px 14px;border-radius:20px;border:1px solid #ddd;background:#fff;color:#333;cursor:pointer;transition:all 0.2s;text-decoration:none;}
.share-btn:hover{border-color:#4A90D9;color:#4A90D9;background:#f0f6ff;}
.share-btn--in{color:#0077b5;border-color:#0077b5;}.share-btn--in:hover{background:#e8f3fc;}
.share-btn--tw{color:#1da1f2;border-color:#1da1f2;}.share-btn--tw:hover{background:#e8f6fd;}
.share-btn--wa{color:#25d366;border-color:#25d366;}.share-btn--wa:hover{background:#e6fbe9;}

/* ===== ANALYTICS DASHBOARD ===== */
.a-grid4{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px;margin-bottom:20px;}
.a-grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:20px;}
.a-stat{background:var(--white);border-radius:8px;padding:20px;text-align:center;box-shadow:0 1px 3px rgba(0,0,0,0.06);}
.a-stat__val{font-size:32px;font-weight:800;margin-bottom:4px;}
.a-stat__label{font-size:13px;color:#666;}
.a-box{background:var(--white);border-radius:8px;padding:20px;margin-bottom:16px;box-shadow:0 1px 3px rgba(0,0,0,0.06);}
.a-box__title{font-size:15px;font-weight:700;margin-bottom:16px;color:var(--dark);}

/* Vertical bar chart */
.bar-chart{display:flex;align-items:flex-end;gap:6px;height:180px;padding:8px 0;border-bottom:1px solid #eee;}
.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;height:100%;justify-content:flex-end;min-width:0;}
.bar-fill{width:100%;min-width:8px;border-radius:4px 4px 0 0;transition:height 0.5s ease;min-height:2px;}
.bar-val{font-size:11px;font-weight:700;color:#333;}
.bar-label{font-size:10px;color:#999;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%;}

/* Horizontal bar chart */
.hbar-chart{display:flex;flex-direction:column;gap:8px;}
.hbar-row{display:flex;align-items:center;gap:10px;}
.hbar-label{width:120px;font-size:13px;color:#333;text-align:right;flex-shrink:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.hbar-track{flex:1;height:24px;background:#f0f2f5;border-radius:4px;overflow:hidden;}
.hbar-fill{height:100%;border-radius:4px;transition:width 0.5s ease;min-width:2px;}
.hbar-val{width:50px;font-size:13px;font-weight:700;color:#333;flex-shrink:0;}

/* Donut-style percentage bars */
.donut-bars{display:flex;flex-direction:column;gap:10px;}
.donut-row{display:flex;align-items:center;gap:8px;}
.donut-color{width:12px;height:12px;border-radius:3px;flex-shrink:0;}
.donut-label{width:70px;font-size:13px;flex-shrink:0;}
.donut-track{flex:1;height:20px;background:#f0f2f5;border-radius:10px;overflow:hidden;}
.donut-fill{height:100%;border-radius:10px;transition:width 0.5s ease;}
.donut-val{width:90px;font-size:12px;font-weight:600;text-align:right;flex-shrink:0;}

@media(max-width:768px){
  .a-grid4{grid-template-columns:1fr 1fr;}
  .a-grid2{grid-template-columns:1fr;}
  .a-stat__val{font-size:24px;}
  .bar-chart{height:140px;}
  .hbar-label{width:80px;font-size:12px;}
}

/* ===== FOOTER ===== */
.ft{background:#1a1a2e;color:#fff;margin-top:60px;}
.ft__top{
  max-width:1200px;margin:0 auto;padding:40px 24px 24px;
  display:grid;grid-template-columns:2fr 1fr 1fr;gap:32px;
}
.ft__brand{display:flex;align-items:flex-start;gap:12px;}
.ft__logo{width:52px;height:52px;border-radius:14px;background:#FF0000;display:grid;place-items:center;font-size:28px;animation:coffeeGlow 2s ease infinite;flex-shrink:0;text-decoration:none;cursor:pointer;transition:transform 0.2s;}
.ft__logo:hover{transform:scale(1.15);}
.ft__name{font-size:16px;font-weight:800;margin-top:2px;}
.ft__tag{font-size:12px;color:rgba(255,255,255,0.4);margin-top:4px;line-height:1.4;}
.ft__heading{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1.2px;color:rgba(255,255,255,0.35);margin-bottom:12px;}
.ft__col{display:flex;flex-direction:column;gap:6px;}
.ft__item{color:rgba(255,255,255,0.6);text-decoration:none;font-size:13px;transition:all 0.15s;padding:2px 0;background:none;border:none;cursor:pointer;font-family:var(--font);text-align:left;}
.ft__item:hover{color:#fff;padding-left:4px;}
.ft__copy{color:rgba(255,255,255,0.6);}
.ft__bottom{
  max-width:1200px;margin:0 auto;padding:16px 24px;
  border-top:1px solid rgba(255,255,255,0.06);
  display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;
  font-size:12px;color:rgba(255,255,255,0.25);
}
.ft__dot{color:rgba(255,255,255,0.12);}
@media(max-width:768px){
  .ft__top{grid-template-columns:1fr 1fr;gap:24px;padding:28px 16px 16px;}
  .ft__brand{grid-column:span 2;}
}
@media(max-width:480px){
  .ft__top{grid-template-columns:1fr;gap:20px;}
  .ft__brand{grid-column:span 1;}
  .ft__bottom{flex-direction:column;gap:4px;}
}
/* ===== RESPONSIVE ===== */
@media(max-width:768px){
  .topbar{padding:0 14px;height:50px;}
  .topbar__brand{font-size:14px;}
  .topbar__search input{width:140px;}
  .topbar__search input:focus{width:180px;}
  .topbar__search kbd{display:none;}
  .page{padding:14px;}
  .page__header h1{font-size:18px;}
  .tbl{font-size:13px;}
  .tbl thead th{padding:10px 12px;font-size:10px;}
  .tbl tbody td{padding:10px 12px;}
  .article{padding:20px 16px;}
  .article__title{font-size:18px;}
  .sec{padding:14px;}
  pre{font-size:11px;padding:10px;}
  .footer__inner{grid-template-columns:1fr;gap:24px;padding:20px 16px 12px;}
}
@media(max-width:480px){
  .topbar__brand{display:none;}
  .topbar__search input{width:120px;}
  .page{padding:10px;}
  .tbl thead th{padding:8px 10px;}
  .tbl tbody td{padding:8px 10px;font-size:12px;}
  .pill{font-size:10px;padding:2px 7px;}
}
@media print{.topbar,.qnav{display:none!important;}.page{max-width:100%;}.article{box-shadow:none;}}

/* ===== DARK MODE TOGGLE ===== */
.topbar__icon{width:34px;height:34px;border:none;background:rgba(255,255,255,0.12);border-radius:50%;color:#fff;font-size:16px;cursor:pointer;display:grid;place-items:center;transition:all 0.2s;}
.topbar__icon:hover{background:rgba(255,255,255,0.25);transform:scale(1.1);}

/* ===== DARK MODE ===== */
body.dark{background:#1a1a2e;color:#e0e0e0;}
body.dark .page{color:#e0e0e0;}
body.dark .page__header h1{color:#fff;}
body.dark .tbl{background:#242438;box-shadow:0 2px 8px rgba(0,0,0,0.3);}
body.dark .tbl thead th{background:linear-gradient(135deg,#1a1a2e,#2a2a45);}
body.dark .tbl tbody tr:nth-child(even){background:#1e1e32;}
body.dark .tbl tbody tr:hover{background:#2a1a1a;}
body.dark .tbl tbody td{border-bottom-color:#2a2a40;color:#ccc;}
body.dark .tbl tbody td strong{color:#fff;}
body.dark .pill--gray{background:#2a2a40;color:#999;}
body.dark .pill--blue{background:#1a1a3e;color:#7b9ff0;}
body.dark .pill--green{background:#1a2e1a;color:#6fd06f;}
body.dark .pill--orange{background:#2e2a1a;color:#f0a050;}
body.dark .badge--num{background:#3a3a55;color:#fff;}
body.dark .cdd__btn{background:#242438;border-color:#3a3a55;color:#ccc;}
body.dark .cdd__list{background:#242438;border-color:#3a3a55;}
body.dark .cdd__item{border-bottom-color:#2a2a40;color:#ccc;}
body.dark .cdd__item:hover{background:#2a2a45;}
body.dark .cdd__item--active{background:#1a1a35;}
body.dark .cdd__q{color:#ddd;}
body.dark .qa-single{background:#242438;box-shadow:0 1px 4px rgba(0,0,0,0.3);}
body.dark .qa-single__q{color:#fff;}
body.dark .sec{background:#1e1e32;}
body.dark .sec p,.dark .sec li{color:#ccc;}
body.dark .sec h4{color:#eee;}
body.dark .sec--green{background:#1a2e1a;}
body.dark .sec--orange{background:#2e2a1a;}
body.dark .sec--code{background:#1a1a30;}
body.dark pre{background:#111120;border-color:#2a2a45;color:#e0e0e0;}
body.dark code{background:#2a2a45;color:#ff8a80;}
body.dark .code-bar{background:#0e0e1a;color:#666;}
body.dark .copy-btn{color:#888;background:rgba(255,255,255,0.05);border-color:#3a3a55;}
body.dark .def-oneliner{background:#1a2e1a;color:#6fd06f;}
body.dark .def-analogy{background:#2e2a1a;color:#d0a060;}
body.dark .takeaway{background:#1a2e1a;}
body.dark mark.hl{background:#1a1a3e;color:#7b9ff0;}
body.dark strong.kw{background:#1a1a3e;color:#ccc;}
body.dark .crumb{color:#777;}
body.dark .crumb a{color:#7b9ff0;}
body.dark .rev-btn{border-color:#3a3a55;color:#999;background:#242438;}
body.dark .rev-btn:hover{border-color:#4A90D9;color:#7b9ff0;background:#1a1a3e;}
body.dark .rev-btn--done{border-color:#2e7d32;background:#1a2e1a;color:#6fd06f;}
body.dark .btn--outline{border-color:#3a3a55;color:#ccc;background:#242438;}
body.dark .btn--outline:hover{background:#3a3a55;color:#fff;}
body.dark .share-btn{border-color:#3a3a55;color:#999;background:#242438;}
body.dark .qnav-bottom{border-top-color:#2a2a40;}
body.dark .popup{background:#242438;color:#e0e0e0;}
body.dark .popup__title{color:#fff;}
body.dark .popup__form input{background:#1a1a2e;border-color:#3a3a55;color:#fff;}

/* ===== RANDOM QUESTION BUTTON ===== */
.random-btn{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;padding:8px 18px;border-radius:20px;border:none;background:linear-gradient(135deg,#FF0000,#ff6b6b);color:#fff;cursor:pointer;transition:all 0.2s;font-family:var(--font);}
.random-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(255,0,0,0.25);}

/* ===== BOOKMARK ===== */
.bmark-btn{background:none;border:none;font-size:20px;cursor:pointer;transition:all 0.2s;padding:4px;opacity:0.4;}
.bmark-btn:hover{opacity:0.8;transform:scale(1.2);}
.bmark-btn.is-saved{opacity:1;animation:heartPop 0.3s ease;}
@keyframes heartPop{0%{transform:scale(1);}50%{transform:scale(1.3);}100%{transform:scale(1);}}

/* ===== PROGRESS BAR ===== */
.prog-bar{width:100%;height:6px;background:#e5e7eb;border-radius:3px;overflow:hidden;margin-top:4px;}
body.dark .prog-bar{background:#2a2a40;}
.prog-fill{height:100%;border-radius:3px;transition:width 0.5s ease;}
.prog-fill--green{background:#27ae60;}
.prog-fill--orange{background:#f39c12;}
.prog-fill--red{background:#e74c3c;}

/* ===== NOTES ===== */
.notes-wrap{margin-top:20px;border-top:1px solid #e5e7eb;padding-top:16px;}
body.dark .notes-wrap{border-top-color:#2a2a40;}
.notes-label{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:0.8px;color:#999;margin-bottom:8px;display:flex;align-items:center;gap:6px;}
.notes-area{width:100%;min-height:80px;padding:12px;border:1.5px solid #d1d5db;border-radius:8px;font-family:var(--font);font-size:14px;color:#333;resize:vertical;transition:border-color 0.2s;background:#fff;}
.notes-area:focus{outline:none;border-color:#4A90D9;box-shadow:0 0 0 3px rgba(74,144,217,0.1);}
body.dark .notes-area{background:#1a1a2e;border-color:#3a3a55;color:#e0e0e0;}
.notes-saved{font-size:11px;color:#27ae60;margin-top:4px;opacity:0;transition:opacity 0.3s;}
.notes-saved.show{opacity:1;}