/* =============================================
   IB MOCK TRAINER — main.css
   Variables, reset, layout, home, modales, GE tokens
   ============================================= */
:root {
  --accent: #6C47FF;
  --accent-2: #00C9A7;
  --accent-ge: #059669;
  --accent-ge-2: #D97706;
  --bg: #F5F4FA;
  --bg-card: #FFFFFF;
  --bg-card-2: #F0EEFF;
  --bg-ge: #ECFDF5;
  --bg-ge-2: #FEF9C3;
  --text: #1A1535;
  --text-muted: #6B6882;
  --border: #E2DFF5;
  --border-ge: #A7F3D0;
  --shadow: 0 4px 24px rgba(108,71,255,0.10);
  --shadow-ge: 0 4px 24px rgba(5,150,105,0.12);
  --shadow-strong: 0 8px 40px rgba(108,71,255,0.18);
  --radius: 18px;
  --radius-sm: 10px;
  --ring-bg: #E2DFF5;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}
body.dark-mode {
  --bg: #100F1E; --bg-card: #1C1A30; --bg-card-2: #231F3A;
  --bg-ge: #064E3B; --bg-ge-2: #422006;
  --text: #F0EEF9; --text-muted: #9D97BE;
  --border: #2E2A4A; --border-ge: #065F46;
  --shadow: 0 4px 24px rgba(0,0,0,0.35);
  --shadow-strong: 0 8px 40px rgba(0,0,0,0.50);
  --ring-bg: #2E2A4A;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);background:var(--bg);color:var(--text);min-height:100vh;transition:background var(--transition),color var(--transition);overflow-x:hidden}

/* ---- SCREENS ---- */
.screen{display:none;min-height:100vh}
.screen.active{display:flex;flex-direction:column}
.hidden{display:none!important}

/* ---- BUTTONS ---- */
.btn-primary{background:var(--accent);color:#fff;border:none;border-radius:var(--radius-sm);padding:12px 28px;font-family:var(--font-body);font-size:1rem;font-weight:600;cursor:pointer;transition:transform var(--transition),box-shadow var(--transition),background var(--transition);box-shadow:0 4px 16px rgba(108,71,255,0.3)}
.btn-primary:hover{background:#5535d4;transform:translateY(-1px);box-shadow:0 6px 22px rgba(108,71,255,0.4)}
.btn-primary.ge-btn{background:var(--accent-ge);box-shadow:0 4px 16px rgba(5,150,105,0.3)}
.btn-primary.ge-btn:hover{background:#047857}
.btn-secondary{background:var(--bg-card-2);color:var(--accent);border:2px solid var(--accent);border-radius:var(--radius-sm);padding:10px 24px;font-family:var(--font-body);font-size:0.95rem;font-weight:600;cursor:pointer;transition:background var(--transition),color var(--transition)}
.btn-secondary:hover{background:var(--accent);color:#fff}
.btn-ghost{background:transparent;color:var(--text-muted);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:9px 20px;font-family:var(--font-body);font-size:0.9rem;cursor:pointer;transition:border-color var(--transition),color var(--transition)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-danger{background:#EF4444;color:#fff;border:none;border-radius:var(--radius-sm);padding:10px 22px;font-size:0.9rem;cursor:pointer}
.btn-danger:hover{background:#DC2626}
.icon-btn{background:var(--bg-card);border:1.5px solid var(--border);border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center;font-size:1.1rem;cursor:pointer;transition:background var(--transition),border-color var(--transition)}
.icon-btn:hover{border-color:var(--accent);background:var(--bg-card-2)}

/* ==============================  HOME  ============================== */
#screen-home{background:var(--bg);position:relative}
.home-bg{position:fixed;top:0;left:0;width:100%;height:100%;background:radial-gradient(ellipse at 80% 10%,rgba(108,71,255,0.12) 0%,transparent 60%),radial-gradient(ellipse at 10% 90%,rgba(5,150,105,0.09) 0%,transparent 55%);pointer-events:none;z-index:0}
.home-header{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:16px 28px;background:rgba(245,244,250,0.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
body.dark-mode .home-header{background:rgba(16,15,30,0.88)}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{font-size:1.5rem}
.logo-text{font-family:var(--font-display);font-size:1.25rem;color:var(--text)}
.logo-text strong{color:var(--accent)}
.header-controls{display:flex;gap:8px}
.home-main{flex:1;display:flex;flex-direction:column;align-items:center;padding:36px 16px 60px;position:relative;z-index:1;gap:32px}

/* HERO */
.hero{text-align:center;max-width:680px}
.hero-badge{display:inline-block;background:var(--bg-card-2);color:var(--accent);border:1.5px solid var(--accent);border-radius:100px;padding:6px 18px;font-size:0.78rem;font-weight:600;letter-spacing:0.03em;margin-bottom:16px}
.hero-title{font-family:var(--font-display);font-size:clamp(2rem,5vw,3.2rem);font-weight:700;line-height:1.15}
.accent{color:var(--accent)}
.hero-sub{color:var(--text-muted);font-size:1rem;margin-top:12px}

/* NAME CARD */
.name-card{background:var(--bg-card);border-radius:var(--radius);padding:24px 28px;box-shadow:var(--shadow);width:100%;max-width:520px;border:1.5px solid var(--border)}
.name-card label{display:block;font-weight:600;margin-bottom:10px}
.name-row{display:flex;gap:10px}
.name-row input{flex:1;padding:11px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);color:var(--text);font-size:1rem;font-family:var(--font-body);outline:none;transition:border-color var(--transition)}
.name-row input:focus{border-color:var(--accent)}

/* DUAL COURSE GRID */
.course-select-dual{width:100%;max-width:1100px}
.dual-label{text-align:center;font-size:0.78rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--text-muted);margin-bottom:16px}
.course-dual-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}

/* COURSE CARDS */
.course-card{border-radius:var(--radius);border:2px solid var(--border);background:var(--bg-card);box-shadow:var(--shadow);overflow:hidden;transition:box-shadow var(--transition)}
.course-card:hover{box-shadow:var(--shadow-strong)}
.td-card{border-color:var(--accent);border-width:2px}
.ge-card{border-color:var(--accent-ge);border-width:2px}
.course-card-header{display:flex;align-items:center;gap:14px;padding:20px 22px;border-bottom:1.5px solid var(--border)}
.td-card .course-card-header{background:var(--bg-card-2)}
.ge-card .course-card-header{background:var(--bg-ge)}
.course-icon{font-size:2rem}
.course-card-title{font-family:var(--font-display);font-size:1.15rem;font-weight:700;color:var(--text)}
.course-card-sub{font-size:0.78rem;color:var(--text-muted);margin-top:2px}
.course-card-body{padding:18px 20px;display:flex;flex-direction:column;gap:14px}

/* Level / Prueba tabs */
.level-tabs{display:flex;background:var(--bg);border-radius:var(--radius-sm);padding:3px;gap:3px;flex-wrap:wrap}
.level-tab{flex:1;min-width:70px;padding:8px 6px;border:none;border-radius:7px;background:transparent;color:var(--text-muted);font-family:var(--font-body);font-size:0.82rem;font-weight:600;cursor:pointer;transition:background var(--transition),color var(--transition);white-space:nowrap}
.td-card .level-tab.active{background:var(--accent);color:#fff}
.ge-card .level-tab.active{background:var(--accent-ge);color:#fff}

/* Mode cards */
.mode-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.mode-card{background:var(--bg);border:2px solid var(--border);border-radius:var(--radius-sm);padding:12px 10px;cursor:pointer;transition:border-color var(--transition),background var(--transition),transform var(--transition);display:flex;flex-direction:column;gap:3px}
.td-card .mode-card:hover,.td-card .mode-card.selected{border-color:var(--accent);background:var(--bg-card-2);transform:translateY(-1px)}
.ge-card .mode-card:hover,.ge-card .mode-card.selected{border-color:var(--accent-ge);background:var(--bg-ge);transform:translateY(-1px)}
.mode-icon{font-size:1.3rem}
.mode-name{font-weight:700;font-size:0.88rem;color:var(--text)}
.mode-info{font-size:0.74rem;color:var(--text-muted)}

/* Topic picker */
.topic-picker{display:flex;flex-direction:column;gap:8px}
.section-label{font-size:0.74rem;font-weight:700;text-transform:uppercase;letter-spacing:0.07em;color:var(--text-muted)}
.topic-list{display:flex;flex-wrap:wrap;gap:6px}
.topic-chip{background:var(--bg);border:1.5px solid var(--border);border-radius:100px;padding:5px 12px;font-size:0.78rem;font-weight:600;cursor:pointer;transition:background var(--transition),border-color var(--transition),color var(--transition);color:var(--text-muted)}
.td-card .topic-chip:hover,.td-card .topic-chip.selected{border-color:var(--accent);color:var(--accent);background:var(--bg-card-2)}
.td-card .topic-chip.selected{background:var(--accent);color:#fff}
.ge-card .topic-chip:hover,.ge-card .topic-chip.selected{border-color:var(--accent-ge);color:var(--accent-ge);background:var(--bg-ge)}
.ge-card .topic-chip.selected{background:var(--accent-ge);color:#fff}

.btn-launch{width:100%;text-align:center;padding:13px;font-size:1rem;border-radius:var(--radius-sm)}

/* HOME FOOTER */
.home-footer{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}
.home-footer .small{font-size:0.82rem;padding:7px 14px}

/* BADGES */
.course-badge{border-radius:100px;padding:3px 10px;font-size:0.72rem;font-weight:700;color:#fff;margin-right:4px}
.td-badge{background:var(--accent)}
.ge-badge{background:var(--accent-ge)}
.level-badge{background:var(--accent);color:#fff;border-radius:100px;padding:3px 10px;font-size:0.72rem;font-weight:700}
.level-badge.p2{background:var(--accent-ge-2)}
.level-badge.calc{background:#7C3AED}

/* ============================== MODALS ============================== */
.modal{position:fixed;inset:0;background:rgba(0,0,0,0.45);z-index:200;display:flex;align-items:center;justify-content:center;padding:20px;animation:fadeIn 0.18s ease}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.modal-box{background:var(--bg-card);border-radius:var(--radius);padding:28px 24px;width:100%;max-width:520px;max-height:88vh;overflow-y:auto;box-shadow:var(--shadow-strong);position:relative;animation:slideUp 0.22s ease}
.modal-box.wide{max-width:680px}
@keyframes slideUp{from{transform:translateY(24px);opacity:0}to{transform:translateY(0);opacity:1}}
.modal-close{position:absolute;top:14px;right:14px;background:var(--bg);border:1.5px solid var(--border);border-radius:50%;width:32px;height:32px;cursor:pointer;font-size:0.85rem;color:var(--text-muted);transition:background var(--transition)}
.modal-close:hover{background:#EF4444;color:#fff;border-color:#EF4444}
.modal-box h2{font-family:var(--font-display);font-size:1.3rem;margin-bottom:14px}
.modal-desc{color:var(--text-muted);font-size:0.9rem;margin-bottom:16px;line-height:1.5}
.modal-desc code{background:var(--bg);padding:2px 6px;border-radius:4px;font-size:0.82rem}
.teacher-actions{display:flex;flex-direction:column;gap:10px}
.file-label{display:inline-flex;align-items:center;justify-content:center;cursor:pointer;user-select:none}
.import-feedback{margin-top:12px;padding:12px 14px;border-radius:var(--radius-sm);font-size:0.88rem;font-weight:600}
.import-feedback.success{background:#D1FAE5;color:#065F46}
.import-feedback.error{background:#FEE2E2;color:#991B1B}
body.dark-mode .import-feedback.success{background:#064E3B;color:#6EE7B7}
body.dark-mode .import-feedback.error{background:#7F1D1D;color:#FCA5A5}
.json-format-help{margin-top:18px}
.json-format-help summary{cursor:pointer;color:var(--accent);font-size:0.85rem;font-weight:600}
.json-format-help pre{margin-top:8px;padding:14px;background:var(--bg);border-radius:var(--radius-sm);font-size:0.72rem;overflow-x:auto;border:1px solid var(--border);line-height:1.5;color:var(--text-muted)}

/* Stats / ranking / history */
#stats-content,#ranking-content,#history-content{display:flex;flex-direction:column;gap:10px}
.stat-row{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;background:var(--bg);border-radius:var(--radius-sm);font-size:0.9rem}
.stat-row strong{color:var(--accent);font-size:1rem}
.rank-item{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--bg);border-radius:var(--radius-sm)}
.rank-pos{font-size:1.1rem;font-weight:700;width:26px}
.rank-info{flex:1}
.rank-name{font-weight:600;font-size:0.92rem}
.rank-detail{font-size:0.76rem;color:var(--text-muted)}
.rank-pts{font-family:var(--font-display);font-weight:700;color:var(--accent);font-size:1rem}
.history-item{padding:10px 12px;background:var(--bg);border-radius:var(--radius-sm);border-left:4px solid var(--accent)}
.history-item.ge-hist{border-left-color:var(--accent-ge)}
.history-item .h-top{display:flex;justify-content:space-between;align-items:center}
.history-item .h-name{font-weight:600;font-size:0.9rem}
.history-item .h-pct{font-weight:700;color:var(--accent)}
.history-item.ge-hist .h-pct{color:var(--accent-ge)}
.history-item .h-meta{font-size:0.76rem;color:var(--text-muted);margin-top:3px}

/* ============================== RESPONSIVE ============================== */
@media(max-width:800px){
  .course-dual-grid{grid-template-columns:1fr}
}
@media(max-width:540px){
  .home-header{padding:12px 14px}
  .hero-title{font-size:1.9rem}
  .name-row{flex-direction:column}
  .mode-cards{grid-template-columns:1fr 1fr}
  .home-footer{gap:6px}
  .course-card-body{padding:14px 12px}
}