/* ===== VARIABLES ===== */
:root {
    --bg: #0f172a;
    --bg2: #1e293b;
    --card: rgba(30,41,59,0.85);
    --primary: #6366f1;
    --primary-h: #818cf8;
    --text: #f8fafc;
    --text2: #94a3b8;
    --success: #22c55e;
    --error: #ef4444;
    --warn: #f59e0b;
    --border: rgba(255,255,255,0.1);
    --shadow: 0 8px 32px rgba(0,0,0,0.4);
    --radius: 16px;
    --tr: all .3s cubic-bezier(.4,0,.2,1);
    --opt-bg: rgba(255,255,255,0.05);
    --font-scale: 1;
}
/* Scrollbar */
::-webkit-scrollbar{width:6px;height:6px}
::-webkit-scrollbar-track{background:#0f172a}
::-webkit-scrollbar-thumb{background:#334155;border-radius:6px}
::-webkit-scrollbar-thumb:hover{background:#475569}
body.light-mode ::-webkit-scrollbar-track{background:#f1f5f9}
body.light-mode ::-webkit-scrollbar-thumb{background:#cbd5e1}
body.light-mode ::-webkit-scrollbar-thumb:hover{background:#94a3b8}
* {scrollbar-color:#334155 #0f172a;scrollbar-width:thin}
body.light-mode *{scrollbar-color:#cbd5e1 #f1f5f9}

body:not(.light-mode) .progress-card {
    background: rgb(30 41 59 / 0%);
    border: 7px solid rgb(20 34 66);
    box-shadow: 0px 0px 44px -11px #4084ed inset;
}
body.light-mode {
    --bg: #f1f5f9; --bg2: #fff; --card: rgba(255,255,255,0.92);
    --text: #1e293b; --text2: #64748b; --border: rgba(0,0,0,0.1);
    --shadow: 0 8px 32px rgba(0,0,0,0.08); --primary: #4f46e5;
    --primary-h: #4338ca; --opt-bg: rgba(0,0,0,0.04);
}

/* ===== RESET ===== */
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%;overflow:hidden}
body{font-family:'Assistant','Outfit',sans-serif;background:var(--bg);color:var(--text);display:flex;flex-direction:column}

/* ===== SCREENS ===== */
.screen{display:none;flex-direction:column;height:100%;overflow-y:auto;animation:fadeIn .35s ease}
.screen.active{display:flex}
@keyframes fadeIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
@keyframes spin{to{transform:rotate(360deg)}}

/* ===== HOME ===== */
.home-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--bg2);border-bottom:1px solid var(--border)}
.home-logo{font-size:1.4rem;font-weight:800;display:flex;align-items:center;gap:8px}
.home-logo span{background:linear-gradient(135deg,var(--primary),#a78bfa);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.home-header-actions{display:flex;gap:6px}
.home-body{flex:1;overflow-y:auto;padding:20px 16px 40px;display:flex;flex-direction:column;align-items:center;gap:18px;max-width:560px;margin:0 auto;width:100%}

/* Filters */
.filter-row{display:flex;gap:10px;width:100%}
.filter-group{flex:1;display:flex;flex-direction:column;gap:4px}
.filter-group label{font-size:.78rem;color:var(--text2);font-weight:600}
.filter-group label span{color:var(--text);font-weight:700}
.license-btns{display:flex;flex-wrap:wrap;gap:6px}
.license-btn{display:flex;flex-direction:column;align-items:center;gap:2px;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:7px 10px;cursor:pointer;font-family:inherit;color:var(--text);font-size:.75rem;transition:var(--tr);line-height:1}
.license-btn span{font-weight:700}
.license-btn:hover{border-color:var(--primary);background:var(--hover)}
.license-btn.active{border-color:var(--primary);background:rgba(99,102,241,.15);color:var(--primary)}
.select-styled{width:100%;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:10px 12px;font-family:inherit;font-size:.9rem;cursor:pointer;transition:var(--tr);outline:none}
.select-styled:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.2)}
.select-sm{padding:7px 10px;font-size:.85rem}

/* Progress card */
.progress-card{width:100%;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px}
.progress-card-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}
.progress-card-title{font-size:.85rem;color:var(--text2);font-weight:600}
.progress-pct{font-size:1rem;font-weight:800;color:var(--primary)}
.progress-bar-container{height:6px;background:rgba(255,255,255,.08);border-radius:6px;overflow:hidden;margin-bottom:14px}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--primary),#a78bfa);border-radius:6px;transition:width .6s ease;width:0}
.progress-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}
.stat-item{display:flex;flex-direction:column;align-items:center;gap:3px;padding:8px 4px;border-radius:10px;background:rgba(255,255,255,.03);border:1px solid var(--border)}
.stat-count{font-weight:800;font-size:1.1rem}
.stat-mastered .stat-count{color:var(--success)}
.stat-learning .stat-count{color:var(--warn)}
.stat-failed .stat-count{color:var(--error)}
.stat-new .stat-count{color:var(--text2)}
.stat-label{color:var(--text2);font-size:.68rem}

/* Buttons */
.btn-primary,.btn-secondary{width:100%;border:none;border-radius:14px;padding:18px 20px;cursor:pointer;font-family:inherit;transition:var(--tr);display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center}
.btn-primary{background:linear-gradient(135deg,var(--primary),#7c3aed);color:#fff;box-shadow:0 4px 20px rgba(99,102,241,.3)}
body:not(.light-mode) .btn-primary{background:linear-gradient(4deg,#007fff,#00ffcf);box-shadow:0 4px 20px rgba(99,102,241,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(99,102,241,.4)}
.btn-secondary{background:var(--card);color:var(--text);border:1px solid var(--border)}
.btn-secondary:hover{border-color:var(--primary);transform:translateY(-2px)}
.btn-large .btn-icon{font-size:1.6rem}
.btn-large .btn-text{font-size:1.15rem;font-weight:700}
.btn-large .btn-sub{font-size:.75rem;color:var(--text2);font-weight:400}
.btn-primary-sm{background:var(--primary);color:#fff;border:none;border-radius:10px;padding:10px 22px;font-family:inherit;font-weight:700;cursor:pointer;transition:var(--tr)}
.btn-primary-sm:hover{background:var(--primary-h)}
.btn-ghost{background:transparent;color:var(--text2);border:1px solid var(--border);border-radius:10px;padding:10px 18px;font-family:inherit;cursor:pointer;transition:var(--tr)}
.btn-ghost:hover{background:rgba(255,255,255,.06)}
.btn-block{width:100%;text-align:center;margin-top:8px;padding:14px;border-radius:12px;cursor:pointer;font-family:inherit;font-size:.9rem;font-weight:600}
.btn-danger{background:rgba(239,68,68,.12);color:var(--error);border:1px solid rgba(239,68,68,.3)}
.btn-danger:hover{background:rgba(239,68,68,.2)}
.import-label{display:block;background:var(--card);color:var(--text);border:1px solid var(--border)}

/* Icon buttons */
.icon-btn{background:transparent;border:1px solid var(--border);border-radius:10px;width:40px;height:40px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.15rem;transition:var(--tr);color:var(--text)}
.icon-btn:hover{background:rgba(255,255,255,.1);transform:translateY(-1px)}
.icon-btn-sm{background:transparent;border:none;border-radius:8px;width:34px;height:34px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1rem;transition:var(--tr);color:var(--text)}
.icon-btn-sm:hover{background:rgba(255,255,255,.12)}
.icon-btn-sm.active,.icon-btn.active{background:var(--primary);color:#fff}

/* ===== EXAM ===== */
.exam-navbar{display:flex;align-items:center;justify-content:space-between;padding:8px 14px;background:var(--bg2);border-bottom:1px solid var(--border);flex-shrink:0;gap:8px}
.nav-back-btn{background:transparent;border:1px solid var(--border);color:var(--text);border-radius:8px;padding:6px 14px;font-family:inherit;font-size:.88rem;font-weight:600;cursor:pointer;transition:var(--tr);white-space:nowrap}
.nav-back-btn:hover{background:rgba(255,255,255,.08)}
.exam-navbar-center{display:flex;gap:4px;align-items:center}
.exam-progress-pill{background:rgba(99,102,241,.15);color:var(--primary-h);border-radius:20px;padding:5px 14px;font-weight:700;font-size:.88rem;white-space:nowrap}
.exam-body{flex:1;overflow-y:auto;padding:14px 14px 24px;display:flex;flex-direction:column;align-items:center;gap:14px}

/* Question card */
.question-card{width:100%;max-width:800px;background:var(--card);backdrop-filter:blur(20px);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem 1.5rem;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:1rem}
.question-image-container{width:100%;display:flex;justify-content:center;border-radius:12px;overflow:hidden;background:rgba(0,0,0,.08)}
.question-image-container img{max-width:100%;max-height:250px;object-fit:contain;border-radius:10px}
.question-image-container:empty{display:none}
.question-meta-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:-4px}
.question-id-wrapper{display:flex;align-items:center;gap:6px}
.question-id{color:var(--text2);font-size:.78rem;font-family:'Outfit',sans-serif;opacity:.8}
.fav-btn{background:transparent;border:none;cursor:pointer;font-size:1.3rem;transition:var(--tr);filter:grayscale(1);opacity:.4;padding:8px;margin:-8px;display:flex;align-items:center;justify-content:center}
.fav-btn:hover{transform:scale(1.2);opacity:.8}
.fav-btn.active{filter:grayscale(0);opacity:1;text-shadow:0 0 8px rgba(251,191,36,0.4)}
.question-meta{color:var(--primary);font-weight:600;font-size:.82rem}
.question-text{font-size:calc(1.2rem * var(--font-scale));line-height:1.5;font-weight:600;transition:font-size .2s ease}

/* Swap zone */
.swap-zone{min-height:160px}
.swap-panel{animation:fadeIn .25s ease}

/* Options */
.options-list{display:grid;gap:10px}
.options-list.layout-rows{grid-template-columns:1fr}
.options-list.layout-grid{grid-template-columns:1fr 1fr}
.option{background:var(--opt-bg);border:1px solid var(--border);padding:13px 16px;border-radius:12px;cursor:pointer;transition:var(--tr);font-size:calc(.95rem * var(--font-scale));text-align:right}
.option:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.25);transform:translateX(-3px)}
.option.correct{background:rgba(34,197,94,.18);border-color:var(--success);color:#4ade80;cursor:default}
.option.wrong{background:rgba(239,68,68,.18);border-color:var(--error);color:#f87171;cursor:default}
.option.disabled{pointer-events:none;opacity:.7}

/* Hint trigger */
.hint-trigger{background:rgba(255,193,7,.1);border:1px solid rgba(255,193,7,.25);color:#fbbf24;padding:8px 16px;border-radius:10px;cursor:pointer;font-family:inherit;font-size:.88rem;transition:var(--tr);margin-top:8px}
.hint-trigger:hover{background:rgba(255,193,7,.18)}

/* Info cards */
.info-card{border-radius:14px;padding:16px 18px;display:flex;flex-direction:column;gap:10px;animation:fadeIn .3s ease}
.info-card-header{display:flex;justify-content:space-between;align-items:center;font-weight:700;font-size:1rem}
.info-close{background:transparent;border:none;color:var(--text2);font-size:1.2rem;cursor:pointer;transition:var(--tr);padding:4px 8px;border-radius:6px}
.info-close:hover{background:rgba(255,255,255,.1);color:var(--text)}
.info-card-body{font-size:calc(.92rem * var(--font-scale));line-height:1.6;color:var(--text);transition:font-size .2s ease}
.info-card-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:4px}
.hint-card{background:rgba(255,193,7,.08);border:1px solid rgba(255,193,7,.25)}
.hint-card .info-card-header{color:#fbbf24}
.explanation-card{border:1px solid var(--border)}
.explanation-card.is-correct{background:rgba(34,197,94,.08);border-color:rgba(34,197,94,.3)}
.explanation-card.is-wrong{background:rgba(239,68,68,.08);border-color:rgba(239,68,68,.3)}

/* Nav panel - inline below controls */
.exam-controls-wrapper{width:100%;max-width:800px;display:flex;flex-direction:column;gap:0}
.nav-map-toggle{background:rgba(99,102,241,.12);border:1px solid rgba(99,102,241,.3);color:var(--primary-h);border-radius:10px;padding:10px 18px;font-family:inherit;font-size:.88rem;font-weight:700;cursor:pointer;transition:var(--tr);white-space:nowrap}
.nav-map-toggle:hover{background:rgba(99,102,241,.22)}
.nav-map-toggle.active{background:var(--primary);color:#fff;border-color:var(--primary)}

.inline-nav-panel{background:var(--card);border:1px solid var(--border);border-radius:0 0 var(--radius) var(--radius);padding:12px 14px 16px;animation:fadeIn .2s ease;overflow:hidden}
.inline-nav-panel .nav-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:5px}

.nav-item{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:6px;font-size:.75rem;font-weight:700;background:rgba(255,255,255,.04);color:var(--text2);min-width:28px;cursor:pointer;transition:var(--tr)}
.nav-item:hover{background:rgba(255,255,255,.12);color:var(--text);transform:scale(1.1)}
.nav-item.current{border:2px solid var(--primary);color:var(--primary);background:rgba(99,102,241,.12)}
.nav-item.answered{background:rgba(255,255,255,.15);border-color:var(--text2);color:var(--text)}
.nav-item.correct{background:rgba(34,197,94,.2);border-color:var(--success);color:#4ade80}
.nav-item.wrong{background:rgba(239,68,68,.2);border-color:var(--error);color:#f87171}

.exam-timer{font-family:'Outfit',sans-serif;font-weight:700;font-size:1.1rem;color:var(--text);background:rgba(255,255,255,.05);padding:4px 12px;border-radius:10px;margin-inline-start:10px;min-width:65px;text-align:center;border:1px solid var(--border)}
.exam-timer.timer-low{color:var(--error);background:rgba(239,68,68,.1);border-color:var(--error);animation:pulse .5s infinite alternate}

/* Switch Toggle */
.switch {position:relative;display:inline-block;width:44px;height:24px}
.switch input {opacity:0;width:0;height:0}
.slider {position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background-color:rgba(255,255,255,0.1);transition:.4s;border-radius:24px;border:1px solid var(--border)}
.slider:before {position:absolute;content:"";height:18px;width:18px;inset-inline-start:3px;bottom:2px;background-color:white;transition:.4s;border-radius:50%}
input:checked + .slider {background-color:var(--primary)}
input:focus + .slider {box-shadow:0 0 1px var(--primary)}
input:checked + .slider:before {transform:translateX(20px)}

.main-actions{display:flex;flex-direction:column;gap:12px;width:100%}
.btn-danger-outline{background:transparent;border:1px solid var(--error);color:var(--error)}
.btn-danger-outline:hover{background:rgba(239,68,68,0.1)}

@keyframes pulse{from{opacity:1}to{opacity:.6}}

/* Exam controls */
.exam-controls{display:flex;justify-content:space-between;width:100%;max-width:800px}
.nav-btn{padding:12px 30px;border-radius:10px;font-weight:700;cursor:pointer;border:1px solid var(--border);background:rgba(255,255,255,.06);color:var(--text);transition:var(--tr);font-size:.92rem;font-family:inherit}
.nav-btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}
.nav-btn:disabled{opacity:.3;cursor:not-allowed}
.nav-btn:not(:disabled):hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.3)}

/* ===== RESULTS ===== */
#screenResults{justify-content:center;align-items:center;background:radial-gradient(circle at center,var(--bg2),var(--bg))}
.results-container{text-align:center;max-width:480px;padding:30px 24px;animation:fadeIn .5s ease}
.results-icon{font-size:4rem;margin-bottom:10px}
.results-title{font-size:1.8rem;font-weight:800;margin-bottom:8px}
.results-score{display:flex;align-items:baseline;justify-content:center;gap:4px;margin-bottom:6px}
.score-big{font-size:3.5rem;font-weight:800;background:linear-gradient(135deg,var(--primary),#a78bfa);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.score-divider{font-size:2rem;color:var(--text2)}
.score-total{font-size:2rem;color:var(--text2)}
.results-pass-line{color:var(--text2);font-size:.85rem;margin-bottom:20px}
.results-breakdown{width:100%;text-align:right;margin-bottom:24px}
.breakdown-table{width:100%;border-collapse:collapse}
.breakdown-table th,.breakdown-table td{padding:8px 12px;border-bottom:1px solid var(--border);font-size:.88rem}
.breakdown-table th{color:var(--text2);font-weight:600;font-size:.78rem}
.results-actions{display:flex;gap:12px;justify-content:center}
.results-actions .btn-primary,.results-actions .btn-secondary{width:auto;padding:12px 28px;flex-direction:row}

/* ===== BANK ===== */
.bank-navbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--bg2);border-bottom:1px solid var(--border);flex-shrink:0}
.bank-title{font-size:1rem;font-weight:700}
.bank-filters{padding:12px 16px;display:flex;flex-direction:column;gap:10px;border-bottom:1px solid var(--border);flex-shrink:0}
.bank-search-row{width:100%}
.search-input{width:100%;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:10px 14px;font-family:inherit;font-size:.9rem;outline:none;transition:var(--tr)}
.search-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(99,102,241,.15)}
.bank-status-tabs{display:flex;gap:6px;overflow-x:auto}
.status-tab{background:rgba(255,255,255,.05);border:1px solid var(--border);color:var(--text2);border-radius:20px;padding:6px 14px;font-size:.8rem;font-family:inherit;cursor:pointer;transition:var(--tr);white-space:nowrap}
.status-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.status-tab:hover:not(.active){background:rgba(255,255,255,.1)}
.bank-count{font-size:.78rem;color:var(--text2)}
.bank-list{flex:1;overflow-y:auto;padding:8px 16px 24px}
.bank-item{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px 16px;margin-bottom:8px;cursor:pointer;transition:var(--tr);display:flex;align-items:flex-start;gap:12px}
.bank-item:hover{border-color:var(--primary);transform:translateX(-3px)}
.bank-item-status{width:12px;height:12px;border-radius:50%;flex-shrink:0;margin-top:4px}
.bank-item-status.s-new{background:var(--text2);opacity:.4}
.bank-item-status.s-fail{background:var(--error)}
.bank-item-status.s-learn{background:var(--warn)}
.bank-item-status.s-master{background:var(--success)}
.bank-item-body{flex:1;min-width:0}
.bank-item-text{font-size:.9rem;line-height:1.4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bank-item-meta{font-size:.72rem;color:var(--text2);margin-top:3px}

/* ===== SETTINGS ===== */
.settings-navbar{display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--bg2);border-bottom:1px solid var(--border);flex-shrink:0}
.settings-title{font-size:1rem;font-weight:700}
.settings-body{flex:1;overflow-y:auto;padding:20px 16px;max-width:500px;margin:0 auto;width:100%}
.settings-section{margin-bottom:24px}
.settings-section-title{font-size:.82rem;color:var(--text2);text-transform:uppercase;letter-spacing:1px;margin-bottom:10px;font-weight:700}
.setting-row{display:flex;justify-content:space-between;align-items:center;padding:12px 0;border-bottom:1px solid var(--border);font-size:.92rem}

/* ===== MODAL ===== */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);z-index:100;display:flex;align-items:center;justify-content:center;padding:16px;animation:fadeIn .2s ease}
.modal-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:20px;max-width:600px;width:100%;max-height:85vh;overflow-y:auto;position:relative}
.modal-close{position:absolute;top:10px;inset-inline-start:10px;background:transparent;border:none;color:var(--text2);font-size:1.3rem;cursor:pointer;padding:4px 8px;border-radius:6px}
.modal-close:hover{background:rgba(255,255,255,.1)}
.modal-info-row{display:flex;gap:8px;margin-top:10px}
.modal-status{margin-top:12px;font-size:.78rem;color:var(--text2);text-align:center}

/* ===== LOADER ===== */
.loader-overlay{position:fixed;inset:0;background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:200;transition:opacity .4s ease}
.loader-overlay.hidden{opacity:0;pointer-events:none}
.spinner{width:44px;height:44px;border:4px solid rgba(255,255,255,.1);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin-bottom:12px}
.hidden{display:none!important}

/* ===== RESPONSIVE ===== */
@media(max-width:600px){
    .options-list.layout-grid{grid-template-columns:repeat(2, 1fr);gap:8px}
    .question-card{padding:1rem}
    .question-text{font-size:1.05rem}
    .question-meta-row{flex-direction:row-reverse;align-items:flex-start;gap:8px}
    .question-id-wrapper{flex-shrink:0}
    .nav-grid{grid-template-columns:repeat(6,1fr)}
    .filter-row{flex-direction:column}
    .results-actions{flex-direction:column}
    .results-actions .btn-primary,.results-actions .btn-secondary{width:100%}
}