/* ===== VARIABLES ===== */
:root {
  --primary: #ff2d78;
  --primary-dark: #e0005a;
  --primary-light: #ffe0ec;
  --secondary: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --accent: #7c3aed;
  --bg: #f8fafc;
  --bg2: #f1f5f9;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --text2: #64748b;
  --text3: #94a3b8;
  --sidebar-w: 260px;
  --topbar-h: 56px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.10);
  --shadow-lg: 0 10px 40px rgba(0,0,0,.14);
  --transition: .18s ease;
}
[data-theme="dark"] {
  --bg: #0f172a; --bg2: #1e293b; --surface: #1e293b;
  --border: #334155; --text: #f1f5f9; --text2: #94a3b8;
  --text3: #64748b; --primary-light: #3d0020;
  --shadow: 0 1px 3px rgba(0,0,0,.3); --shadow-md: 0 4px 16px rgba(0,0,0,.4);
}

/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);font-size:15px;line-height:1.6;transition:background var(--transition),color var(--transition)}
img{max-width:100%}
button{cursor:pointer;font-family:inherit}
input,textarea,select{font-family:inherit}
a{color:var(--primary);text-decoration:none}

/* ===== LAYOUT ===== */
.main-wrapper{margin-left:var(--sidebar-w);min-height:100vh;display:flex;flex-direction:column;transition:margin var(--transition)}
.main-content{flex:1;padding:24px;max-width:1200px;margin:0 auto;width:100%;padding-top:calc(var(--topbar-h) + 24px)}

/* ===== SIDEBAR ===== */
.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-w);height:100vh;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;z-index:200;transition:transform var(--transition),box-shadow var(--transition);overflow-y:auto}
.sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:18px 16px 12px}
.sidebar-close{display:none;background:none;border:none;font-size:18px;color:var(--text2)}
.logo{display:flex;align-items:center;gap:10px}
.logo-icon{font-size:28px}
.logo-svg { display: block; flex-shrink: 0; }
.logo-title{font-size:17px;font-weight:800;color:var(--text);letter-spacing:.03em}
.logo-sub{font-size:11px;color:var(--text2)}
.sidebar-perfil{display:flex;align-items:center;gap:10px;padding:10px 16px;background:var(--bg2);margin:0 10px;border-radius:var(--radius-sm)}
.perfil-avatar{font-size:26px}
.perfil-nombre{font-weight:600;font-size:14px}
.perfil-nivel{font-size:12px;color:var(--text2)}
.sidebar-puntos{display:flex;align-items:center;gap:6px;padding:8px 16px;font-size:13px;color:var(--text2)}
.racha-badge{margin-left:auto;background:var(--primary-light);color:var(--primary);padding:2px 8px;border-radius:20px;font-size:12px;font-weight:600}
.sidebar-nav{padding:8px 10px;flex:1}
.nav-item{width:100%;display:flex;align-items:center;gap:10px;padding:10px 12px;border:none;border-radius:var(--radius-sm);background:transparent;color:var(--text2);font-size:14px;font-weight:500;text-align:left;transition:background var(--transition),color var(--transition)}
.nav-item:hover{background:var(--bg2);color:var(--text)}
.nav-item.active{background:var(--primary-light);color:var(--primary)}
.nav-icon{font-size:17px;width:22px;text-align:center}
.nav-divider{height:1px;background:var(--border);margin:8px 4px}
.sidebar-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:199}

/* ===== TOPBAR ===== */
.topbar{position:fixed;top:0;left:var(--sidebar-w);right:0;height:var(--topbar-h);background:var(--surface);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:12px;z-index:100;transition:left var(--transition)}
.menu-btn{display:none;background:none;border:none;font-size:22px;color:var(--text2);padding:4px}
.topbar-title{font-weight:700;font-size:16px;flex:1}
.topbar-right{display:flex;align-items:center;gap:10px}
.topbar-pts{font-size:14px;font-weight:600;color:var(--primary);background:var(--primary-light);padding:4px 10px;border-radius:20px}
.topbar-perfil-btn{background:none;border:none;font-size:22px}

/* ===== VIEWS ===== */
.view{display:none}.view.active{display:block}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 20px;border-radius:var(--radius-sm);font-size:14px;font-weight:500;border:none;transition:background var(--transition),transform .1s,box-shadow var(--transition);white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-dark)}
.btn-outline{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}.btn-outline:hover{background:var(--primary-light)}
.btn-warning{background:var(--warning);color:#fff}.btn-sm{padding:5px 12px;font-size:13px}
.btn-block{width:100%;margin-top:12px}
.btn-icon{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:6px 9px;font-size:16px;color:var(--text2);transition:background var(--transition)}.btn-icon:hover{background:var(--bg2)}
.btn-send{background:var(--primary);color:#fff;border:none;border-radius:var(--radius-sm);padding:8px 14px;font-size:18px;transition:background var(--transition)}.btn-send:hover{background:var(--primary-dark)}

/* ===== INPUTS ===== */
.input-field{width:100%;padding:10px 14px;border:1.5px solid var(--border);border-radius:var(--radius-sm);font-size:14px;background:var(--surface);color:var(--text);transition:border-color var(--transition);resize:vertical}
.input-field:focus{outline:none;border-color:var(--primary)}
.form-group{display:flex;flex-direction:column;gap:6px;flex:1}
.form-group label{font-size:13px;font-weight:500;color:var(--text2)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* ===== ONBOARDING ===== */
.onboarding-container{max-width:560px;margin:0 auto;padding:20px 0}
.onboarding-hero{text-align:center;margin-bottom:32px}
.hero-flag{font-size:56px;margin-bottom:12px}
.hero-title{font-size:40px;font-weight:800;margin-bottom:8px}
.hero-sub{font-size:16px;color:var(--text2);line-height:1.6}
.gradient-text{background:linear-gradient(135deg,var(--primary),#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.gradient-text-new{background:linear-gradient(135deg,#e91e8c,#f05a28,#7c3aed);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-logo{margin-bottom:12px;display:flex;justify-content:center}
.onboarding-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-md)}
.onboarding-card h2{font-size:20px;font-weight:700;margin-bottom:18px}
.hidden{display:none!important}
.optional{font-size:13px;color:var(--text3);font-weight:400}
.nivel-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.nivel-card{padding:18px;border:2px solid var(--border);border-radius:var(--radius);background:var(--surface);cursor:pointer;text-align:center;transition:border-color var(--transition),background var(--transition)}
.nivel-card:hover,.nivel-card.selected{border-color:var(--primary);background:var(--primary-light)}
.nivel-card-icon{font-size:32px;margin-bottom:8px}
.nivel-card-label{font-weight:600;font-size:14px}
.nivel-card-sub{font-size:12px;color:var(--text2);margin-top:3px}
.grade-grid,.bach-grid{display:flex;flex-wrap:wrap;gap:10px}
.grade-btn,.bach-btn{padding:10px 16px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);font-size:14px;font-weight:500;cursor:pointer;transition:all var(--transition)}
.grade-btn:hover,.grade-btn.selected,.bach-btn:hover,.bach-btn.selected{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}

/* ===== DASHBOARD ===== */
.dashboard-welcome{margin-bottom:24px}
.dashboard-welcome h1{font-size:28px;font-weight:800}
.dashboard-welcome p{color:var(--text2);font-size:16px}
.stats-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-bottom:28px}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-align:center;box-shadow:var(--shadow)}
.stat-icon{font-size:28px;margin-bottom:6px}
.stat-val{font-size:26px;font-weight:800;color:var(--primary)}
.stat-label{font-size:12px;color:var(--text2);margin-top:2px}
.section-title{font-size:18px;font-weight:700;margin-bottom:14px;margin-top:8px}
.materia-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:12px;margin-bottom:28px}
.materia-card{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:16px;cursor:pointer;text-align:center;transition:all var(--transition);box-shadow:var(--shadow)}
.materia-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow-md)}
.materia-card-icon{font-size:28px;margin-bottom:8px}
.materia-card-name{font-size:13px;font-weight:600}
.quick-actions{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.quick-btn{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:16px 10px;display:flex;flex-direction:column;align-items:center;gap:8px;font-size:13px;font-weight:500;transition:all var(--transition)}
.quick-btn:hover{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}
.quick-btn span:first-child{font-size:24px}

/* ===== CHAT ===== */
.chat-layout{display:grid;grid-template-columns:220px 1fr;height:calc(100vh - var(--topbar-h) - 48px);gap:0;background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;box-shadow:var(--shadow-md)}
.chat-sidebar{border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}
.chat-sidebar-header{display:flex;align-items:center;justify-content:space-between;padding:14px;border-bottom:1px solid var(--border);font-weight:600;font-size:14px}
.chat-materia-list{flex:1;overflow-y:auto;padding:8px}
.chat-materia-item{display:flex;align-items:center;gap:8px;padding:10px 10px;border-radius:var(--radius-sm);cursor:pointer;font-size:13px;font-weight:500;transition:background var(--transition)}
.chat-materia-item:hover{background:var(--bg2)}
.chat-materia-item.active{background:var(--primary-light);color:var(--primary)}
.chat-main{display:flex;flex-direction:column;min-height:0}
.chat-header{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--border)}
.chat-header-info{display:flex;align-items:center;gap:12px;font-size:22px}
.chat-materia-name{font-weight:700;font-size:15px}
.chat-materia-sub{font-size:12px;color:var(--text2)}
.chat-header-actions{display:flex;gap:8px}
.chat-messages{flex:1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:14px}
.chat-empty{text-align:center;margin:auto;color:var(--text2)}
.chat-empty-icon{font-size:48px;margin-bottom:12px}
.msg{display:flex;gap:10px;max-width:85%}
.msg.user{flex-direction:row-reverse;align-self:flex-end}
.msg-avatar{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0;margin-top:2px}
.msg.user .msg-avatar{background:var(--primary);color:#fff}
.msg.ai .msg-avatar{background:var(--bg2)}
.msg-bubble{padding:12px 16px;border-radius:var(--radius);font-size:14px;line-height:1.65}
.msg.user .msg-bubble{background:var(--primary);color:#fff;border-bottom-right-radius:4px}
.msg.ai .msg-bubble{background:var(--bg2);color:var(--text);border-bottom-left-radius:4px}
.msg-time{font-size:11px;color:var(--text3);margin-top:4px;text-align:right}
.msg.ai .msg-time{text-align:left}
.msg-bubble p{margin-bottom:8px}.msg-bubble p:last-child{margin-bottom:0}
.msg-bubble strong{font-weight:600}
.msg-bubble ul,.msg-bubble ol{padding-left:18px;margin:6px 0}
.msg-bubble li{margin-bottom:4px}
.msg-bubble code{background:rgba(0,0,0,.1);padding:1px 5px;border-radius:4px;font-family:monospace;font-size:13px}
.msg-bubble pre{background:rgba(0,0,0,.12);padding:10px;border-radius:6px;overflow-x:auto;margin:8px 0}
.typing-dot{display:inline-flex;gap:4px;padding:12px 16px;background:var(--bg2);border-radius:var(--radius)}.typing-dot span{width:7px;height:7px;border-radius:50%;background:var(--text3);animation:blink 1.2s infinite}.typing-dot span:nth-child(2){animation-delay:.2s}.typing-dot span:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.2}40%{opacity:1}}
.chat-input-area{border-top:1px solid var(--border);padding:12px 16px}
.chat-suggestions{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
.suggestion-chip{background:var(--primary-light);color:var(--primary);border:none;border-radius:20px;padding:5px 12px;font-size:12px;cursor:pointer;transition:background var(--transition)}.suggestion-chip:hover{background:var(--primary);color:#fff}
.chat-input-row{display:flex;align-items:flex-end;gap:8px}
.chat-textarea{flex:1;resize:none;max-height:120px;border-radius:var(--radius-sm);padding:9px 12px;border:1.5px solid var(--border);background:var(--bg);color:var(--text);font-size:14px;line-height:1.5;transition:border-color var(--transition)}.chat-textarea:focus{outline:none;border-color:var(--primary)}

/* ===== PAGE CONTAINERS ===== */
.page-container{max-width:860px;margin:0 auto}
.page-header{margin-bottom:28px}
.page-header h1{font-size:26px;font-weight:800;margin-bottom:6px}
.page-header p{color:var(--text2);font-size:15px}

/* ===== UPLOAD ===== */
.upload-area{border:2px dashed var(--border);border-radius:var(--radius);padding:40px;text-align:center;cursor:pointer;transition:all var(--transition);margin-bottom:16px;background:var(--bg2)}
.upload-area:hover{border-color:var(--primary);background:var(--primary-light)}
.upload-icon{font-size:48px;margin-bottom:12px}
.upload-hint{font-size:13px;color:var(--text3);margin-top:4px}
.upload-preview{max-height:280px;border-radius:var(--radius-sm);object-fit:contain;margin:0 auto;display:block}
.imagen-controls{display:flex;flex-direction:column;gap:10px;margin-bottom:16px}
.upload-mini{border:1.5px dashed var(--border);border-radius:var(--radius-sm);padding:12px;text-align:center;cursor:pointer;font-size:13px;color:var(--text2);transition:all var(--transition)}.upload-mini:hover{border-color:var(--primary);color:var(--primary)}

/* ===== RESULTADO ===== */
.resultado-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-md);margin-top:16px}
.resultado-actions{display:flex;gap:8px;margin-bottom:14px;flex-wrap:wrap}
.resultado-content{font-size:14px;line-height:1.8;color:var(--text)}
.resultado-content h1,.resultado-content h2,.resultado-content h3{font-weight:700;margin:16px 0 8px;color:var(--primary)}
.resultado-content p{margin-bottom:10px}
.resultado-content ul,.resultado-content ol{padding-left:20px;margin:8px 0}
.resultado-content li{margin-bottom:5px}
.resultado-content strong{font-weight:600}
.resultado-content hr{border:none;border-top:1px solid var(--border);margin:16px 0}
.resultado-content pre{background:var(--bg2);padding:12px;border-radius:var(--radius-sm);overflow-x:auto;font-family:monospace;font-size:13px}
.resultado-content code{background:var(--bg2);padding:1px 5px;border-radius:4px;font-family:monospace;font-size:13px}
.resultado-content table{width:100%;border-collapse:collapse;margin:12px 0}
.resultado-content th{background:var(--primary);color:#fff;padding:8px 12px;text-align:left;font-size:13px}
.resultado-content td{padding:8px 12px;border-bottom:1px solid var(--border);font-size:13px}

/* ===== MÉTODO PROFE ===== */
.metodo-layout{display:grid;grid-template-columns:220px 1fr;gap:20px}
.metodo-sidebar h3,.seguimiento-sidebar h3{font-size:14px;font-weight:600;color:var(--text2);margin-bottom:10px;text-transform:uppercase;letter-spacing:.05em}
.metodo-materia-list,.seguimiento-materia-list{display:flex;flex-direction:column;gap:4px}
.metodo-materia-item,.seguimiento-materia-item{display:flex;align-items:center;gap:8px;padding:9px 10px;border-radius:var(--radius-sm);cursor:pointer;font-size:13px;font-weight:500;transition:background var(--transition);border:1.5px solid transparent}
.metodo-materia-item:hover,.seguimiento-materia-item:hover{background:var(--bg2)}
.metodo-materia-item.active,.seguimiento-materia-item.active{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}
.metodo-materia-item.configured::after{content:'✓';margin-left:auto;color:var(--secondary);font-weight:700}
.metodo-empty{text-align:center;padding:48px 24px;color:var(--text2);font-size:32px}
.metodo-empty p{font-size:15px;margin-top:10px}
.metodo-editor{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.metodo-editor h3{font-size:17px;font-weight:700;margin-bottom:18px}

/* ===== MATERIAL ===== */
.material-form{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:14px}

/* ===== SEGUIMIENTO ===== */
.seguimiento-layout{display:grid;grid-template-columns:220px 1fr;gap:20px}
.seguimiento-main{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.seguimiento-main h3{font-size:17px;font-weight:700;margin-bottom:18px}
.seguimiento-sections{display:flex;flex-direction:column;gap:24px}
.seg-section h4{font-size:14px;font-weight:600;margin-bottom:10px;color:var(--text)}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px;min-height:32px}
.tag{display:flex;align-items:center;gap:4px;padding:4px 10px;border-radius:20px;font-size:12px;font-weight:500}
.tag-green{background:#d1fae5;color:#065f46}
.tag-yellow{background:#fef3c7;color:#92400e}
.tag-del{background:none;border:none;cursor:pointer;font-size:13px;color:inherit;opacity:.6}.tag-del:hover{opacity:1}
.add-tag{display:flex;gap:8px;align-items:center}
.add-nota{display:grid;grid-template-columns:1fr auto auto;gap:8px;align-items:center;margin-top:8px}
.notas-list{display:flex;flex-direction:column;gap:8px;margin-bottom:10px}
.nota-item{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;background:var(--bg2);border-radius:var(--radius-sm);font-size:13px}
.nota-score{font-size:18px;font-weight:700}
.nota-score.good{color:var(--secondary)}.nota-score.mid{color:var(--warning)}.nota-score.bad{color:var(--danger)}

/* ===== LOGROS ===== */
.puntos-total-card{background:linear-gradient(135deg,var(--primary),#8b5cf6);color:#fff;border-radius:var(--radius);padding:28px;text-align:center;margin-bottom:24px;box-shadow:var(--shadow-lg)}
.pts-big{font-size:56px;font-weight:800;display:block}
.pts-label{font-size:16px;opacity:.85}
.nivel-badge{display:inline-block;background:rgba(255,255,255,.2);padding:6px 18px;border-radius:20px;margin-top:12px;font-weight:600;font-size:14px}
.logros-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.logro-card{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius);padding:18px;text-align:center;transition:all var(--transition);box-shadow:var(--shadow)}
.logro-card.obtenido{border-color:var(--warning);box-shadow:0 0 16px rgba(245,158,11,.2)}
.logro-card.bloqueado{opacity:.5;filter:grayscale(1)}
.logro-icon{font-size:36px;margin-bottom:8px}
.logro-nombre{font-weight:700;font-size:14px;margin-bottom:4px}
.logro-desc{font-size:12px;color:var(--text2);margin-bottom:8px}
.logro-pts{font-size:13px;font-weight:600;color:var(--warning)}

/* ===== PROFESOR ===== */
.profesor-tabs{display:flex;gap:8px;margin-bottom:20px;border-bottom:1px solid var(--border);padding-bottom:0}
.tab-btn{background:none;border:none;padding:10px 18px;font-size:14px;font-weight:500;color:var(--text2);border-bottom:2px solid transparent;transition:all var(--transition);margin-bottom:-1px}
.tab-btn.active{color:var(--primary);border-bottom-color:var(--primary)}
.tab-btn:hover{color:var(--text)}
.prof-tab{display:none}.prof-tab.active{display:block}
.guias-list{display:flex;flex-direction:column;gap:10px}
.guia-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 18px;display:flex;align-items:center;justify-content:space-between}
.guia-item-info{font-size:14px;font-weight:500}
.guia-item-sub{font-size:12px;color:var(--text2);margin-top:2px}
.prof-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}

/* ===== TOAST ===== */
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(80px);background:#1e293b;color:#fff;padding:12px 22px;border-radius:50px;font-size:14px;font-weight:500;z-index:9999;transition:transform .3s ease,opacity .3s;opacity:0;pointer-events:none;white-space:nowrap;box-shadow:var(--shadow-lg)}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1}
.toast.success{background:var(--secondary)}.toast.error{background:var(--danger)}.toast.warning{background:var(--warning)}

/* ===== RESPONSIVE ===== */
@media(max-width:900px){
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .quick-actions{grid-template-columns:repeat(2,1fr)}
  .chat-layout{grid-template-columns:1fr;height:auto}
  .chat-sidebar{display:none}
  .metodo-layout,.seguimiento-layout{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .add-nota{grid-template-columns:1fr 1fr auto}
}

@media(max-width:768px){
  :root{--sidebar-w:0px;--topbar-h:54px}
  .sidebar{transform:translateX(-280px);width:280px;box-shadow:none}
  .sidebar.open{transform:translateX(0);box-shadow:var(--shadow-lg)}
  .sidebar-close{display:block}
  .sidebar-overlay.show{display:block}
  .main-wrapper{margin-left:0}
  .topbar{left:0}
  .menu-btn{display:flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:var(--radius-sm)}
  .main-content{padding:12px;padding-top:calc(var(--topbar-h) + 12px)}

  /* Dashboard móvil */
  .dashboard-welcome h1{font-size:22px}
  .dashboard-welcome p{font-size:14px}
  .stats-row{grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:20px}
  .stat-card{padding:14px 10px}
  .stat-icon{font-size:22px}
  .stat-val{font-size:22px}
  .stat-label{font-size:11px}
  .materia-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .materia-card{padding:14px 10px}
  .materia-card-icon{font-size:24px;margin-bottom:6px}
  .materia-card-name{font-size:12px}
  .quick-actions{grid-template-columns:repeat(2,1fr);gap:10px}
  .quick-btn{padding:14px 8px;font-size:12px;min-height:72px}
  .quick-btn span:first-child{font-size:22px}
  .section-title{font-size:16px}

  /* Chat móvil — pantalla completa */
  .chat-layout{
    height:calc(100dvh - var(--topbar-h) - 24px);
    border-radius:var(--radius);
    grid-template-columns:1fr;
  }
  .chat-sidebar{display:none}
  .chat-header{padding:10px 14px}
  .chat-messages{padding:12px}
  .msg{max-width:92%}
  .msg-bubble{padding:10px 13px;font-size:14px}
  .chat-input-area{padding:10px 12px}
  .chat-textarea{font-size:15px}/* más grande para móvil */
  .btn-send{padding:10px 14px;font-size:20px}

  /* Mostrar selector de materia en chat móvil */
  .chat-materia-mobile{display:flex}

  /* Página header */
  .page-header h1{font-size:20px}
  .page-header p{font-size:13px}
  .page-container{padding:0}

  /* Upload */
  .upload-area{padding:24px 16px}
  .upload-icon{font-size:36px}

  /* Onboarding */
  .onboarding-container{padding:12px 0}
  .onboarding-hero{margin-bottom:20px}
  .hero-title{font-size:28px}
  .hero-sub{font-size:14px}
  .onboarding-card{padding:20px 16px}
  .onboarding-card h2{font-size:17px;margin-bottom:14px}
  .nivel-grid{grid-template-columns:1fr 1fr;gap:10px}
  .nivel-card{padding:14px 8px}
  .nivel-card-icon{font-size:26px}
  .nivel-card-label{font-size:13px}
  .grade-btn,.bach-btn{padding:11px 14px;font-size:14px;min-height:44px}

  /* Logros */
  .logros-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .logro-card{padding:14px 10px}
  .logro-icon{font-size:28px}
  .pts-big{font-size:44px}

  /* Material */
  .material-form{padding:16px}

  /* Seguimiento y método */
  .metodo-layout,.seguimiento-layout{grid-template-columns:1fr;gap:14px}
  .metodo-editor,.seguimiento-main{padding:16px}

  /* Profesor tabs */
  .tab-btn{padding:8px 12px;font-size:13px}

  /* Auth */
  .auth-card{padding:24px 18px;border-radius:14px}
  .auth-logo-text{font-size:20px}

  /* Toast más arriba en móvil para no tapar el teclado */
  .toast{bottom:80px;max-width:90vw;text-align:center;white-space:normal}

  /* Resultado */
  .resultado-card{padding:14px}
  .resultado-actions{gap:6px}
  .resultado-actions .btn{padding:6px 10px;font-size:12px}
}

@media(max-width:400px){
  .hero-title{font-size:24px}
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .materia-grid{grid-template-columns:repeat(2,1fr)}
  .nivel-grid{grid-template-columns:1fr 1fr}
  .logros-grid{grid-template-columns:1fr 1fr}
  .auth-card{padding:20px 14px}
  .chat-layout{border-radius:8px}
  .msg{max-width:95%}
}

/* Selector de materia en chat móvil */
.chat-materia-mobile{
  display:none;
  overflow-x:auto;
  gap:8px;
  padding:10px 14px;
  border-bottom:1px solid var(--border);
  -webkit-overflow-scrolling:touch;
  scrollbar-width:none;
}
.chat-materia-mobile::-webkit-scrollbar{display:none}
.chat-materia-chip{
  flex-shrink:0;
  padding:7px 14px;
  border-radius:20px;
  border:1.5px solid var(--border);
  background:var(--surface);
  font-size:13px;
  font-weight:500;
  white-space:nowrap;
  transition:all var(--transition);
}
.chat-materia-chip.active{
  background:var(--primary);
  color:#fff;
  border-color:var(--primary);
}

/* Barra de navegación inferior para móvil */
.bottom-nav{
  display:none;
  position:fixed;
  bottom:0;left:0;right:0;
  height:60px;
  background:var(--surface);
  border-top:1px solid var(--border);
  z-index:150;
  padding:0 8px;
  gap:4px;
  align-items:center;
  justify-content:space-around;
  box-shadow:0 -2px 10px rgba(0,0,0,.08);
}
.bottom-nav-item{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:2px;
  padding:6px 10px;
  border:none;
  background:none;
  color:var(--text2);
  font-size:10px;
  font-weight:500;
  border-radius:var(--radius-sm);
  transition:color var(--transition);
  min-width:52px;
}
.bottom-nav-item .bn-icon{font-size:20px}
.bottom-nav-item.active{color:var(--primary)}
@media(max-width:768px){
  .bottom-nav{display:flex}
  .main-content{padding-bottom:72px}
  .chat-layout{height:calc(100dvh - var(--topbar-h) - 60px - 12px)}
  .toast{bottom:72px}
}
@media print{
  .sidebar,.topbar,.chat-input-area,.resultado-actions,.skill-bar,#toast{display:none!important}
  .main-wrapper{margin:0}.main-content{padding:0}
  .resultado-card{box-shadow:none;border:none}
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar{width:5px;height:5px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text3)}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.view.active{animation:fadeIn .2s ease}
.msg{animation:fadeIn .15s ease}

/* ===== AUTH SCREEN ===== */
.auth-screen{position:fixed;inset:0;background:linear-gradient(135deg,#0f172a 0%,#1e1b4b 50%,#0f172a 100%);display:flex;align-items:center;justify-content:center;z-index:9999;padding:16px}
.auth-card{background:var(--surface);border-radius:16px;padding:32px 28px;width:100%;max-width:420px;box-shadow:0 25px 60px rgba(0,0,0,.4)}
.auth-logo{display:flex;align-items:center;gap:10px;justify-content:center;margin-bottom:6px}
.auth-logo-text{font-size:24px;font-weight:800;color:var(--text)}
.auth-logo-text span{color:#6366f1}
.auth-sub{text-align:center;color:var(--text2);font-size:14px;margin-bottom:20px}
.auth-tabs{display:flex;background:var(--bg2);border-radius:8px;padding:3px;margin-bottom:20px;gap:3px}
.auth-tab{flex:1;padding:8px;border:none;border-radius:6px;font-size:14px;font-weight:500;background:transparent;color:var(--text2);transition:all var(--transition)}
.auth-tab.active{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}
.auth-form{display:flex;flex-direction:column;gap:14px}
.btn-google{display:flex;align-items:center;justify-content:center;gap:10px;padding:10px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);font-size:14px;font-weight:500;color:var(--text);transition:background var(--transition)}
.btn-google:hover{background:var(--bg2)}
.auth-divider{display:flex;align-items:center;gap:10px;color:var(--text3);font-size:13px}
.auth-divider::before,.auth-divider::after{content:'';flex:1;height:1px;background:var(--border)}
.btn-link{background:none;border:none;color:var(--primary);font-size:13px;text-align:center;padding:4px}
.btn-link:hover{text-decoration:underline}
.auth-error{background:#fef2f2;border:1px solid #fecaca;color:#991b1b;padding:10px 14px;border-radius:8px;font-size:13px;margin-top:8px}
[data-theme="dark"] .auth-error{background:#450a0a;border-color:#7f1d1d;color:#fca5a5}

/* ===== USER MENU ===== */
.user-menu-btn{display:flex;align-items:center;gap:8px;background:var(--bg2);border:1px solid var(--border);border-radius:20px;padding:5px 12px 5px 5px;cursor:pointer;transition:background var(--transition)}
.user-menu-btn:hover{background:var(--border)}
.user-avatar-circle{width:28px;height:28px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
.user-menu-name{font-size:13px;font-weight:500;max-width:100px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-dropdown{position:absolute;top:calc(100% + 8px);right:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-md);min-width:180px;z-index:300;overflow:hidden}
.user-dropdown-item{display:flex;align-items:center;gap:8px;padding:10px 14px;font-size:14px;width:100%;background:none;border:none;color:var(--text);text-align:left;transition:background var(--transition)}
.user-dropdown-item:hover{background:var(--bg2)}
.user-dropdown-item.danger{color:var(--danger)}
.topbar-right{position:relative}

/* ===== LOGO NUEVO (rosa/naranja/morado) ===== */
.auth-logo-text span{
  background:linear-gradient(135deg,#ff2d78,#ff6b00,#7c3aed);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text
}
.puntos-total-card{
  background:linear-gradient(135deg,#ff2d78,#ff6b00,#c850c0,#7c3aed) !important;
}
.btn-primary{background:linear-gradient(135deg,#ff2d78,#ff6b00) !important}
.btn-primary:hover{background:linear-gradient(135deg,#e0005a,#d45a00) !important}
.nav-item.active{background:#ffe0ec;color:#ff2d78}
.chat-materia-item.active{background:#ffe0ec;color:#ff2d78}
.chat-materia-chip.active{background:linear-gradient(135deg,#ff2d78,#7c3aed);color:#fff;border-color:transparent}
.bottom-nav-item.active{color:#ff2d78}
.topbar-pts{background:#ffe0ec;color:#ff2d78}
.logro-card.obtenido{border-color:#ff6b00;box-shadow:0 0 16px rgba(255,107,0,.2)}
.gradient-text-new{background:linear-gradient(135deg,#ff2d78,#ff6b00,#7c3aed);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* ===== SPLASH SCREEN ===== */
.splash-screen {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #0d0014 0%, #1a0030 40%, #0d001a 70%, #1a000d 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  overflow: hidden;
}

.splash-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  position: relative;
  z-index: 2;
}

/* Logo SVG grande */
.splash-logo {
  width: 220px;
  height: 110px;
  filter: drop-shadow(0 0 20px rgba(233,30,140,0.5))
          drop-shadow(0 0 40px rgba(124,58,237,0.3));
}

/* Animación del trazo izquierdo — se dibuja en 1.2s */
.splash-path-left {
  animation: drawPath 1.2s cubic-bezier(.4,0,.2,1) 0.3s forwards;
}

/* Animación del trazo derecho — empieza 0.5s después */
.splash-path-right {
  animation: drawPath 1.2s cubic-bezier(.4,0,.2,1) 0.8s forwards;
}

@keyframes drawPath {
  to { stroke-dashoffset: 0; }
}

/* Letras A e I aparecen después de los trazos */
.splash-letter-a {
  animation: fadeInLetter 0.5s ease 1.6s forwards;
}
.splash-letter-i {
  animation: fadeInLetter 0.5s ease 1.9s forwards;
}
@keyframes fadeInLetter {
  from { opacity: 0; transform: scale(0.5); }
  to   { opacity: 1; transform: scale(1); }
}

/* Pulso continuo del logo después de aparecer */
.splash-logo {
  animation: splashPulse 2s ease-in-out 2.5s infinite;
}
@keyframes splashPulse {
  0%, 100% { filter: drop-shadow(0 0 20px rgba(233,30,140,.5)) drop-shadow(0 0 40px rgba(124,58,237,.3)); }
  50%       { filter: drop-shadow(0 0 35px rgba(233,30,140,.9)) drop-shadow(0 0 60px rgba(124,58,237,.6)); }
}

/* Título INFINITY */
.splash-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  opacity: 0;
  animation: slideUp 0.7s cubic-bezier(.4,0,.2,1) 2.0s forwards;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.splash-word {
  font-family: 'Inter', sans-serif;
  font-size: 36px;
  font-weight: 800;
  letter-spacing: 4px;
  background: linear-gradient(135deg, #ffffff, #f0c0e0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.splash-ia {
  font-family: 'Inter', sans-serif;
  font-size: 28px;
  font-weight: 700;
  background: linear-gradient(135deg, #e91e8c, #f05a28, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: splashIAShine 2s ease 3s infinite;
}
@keyframes splashIAShine {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.7; }
}

/* Subtítulo */
.splash-sub {
  font-size: 15px;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.5px;
  opacity: 0;
  animation: slideUp 0.6s ease 2.4s forwards;
}

/* Barra de carga */
.splash-loader {
  width: 200px;
  height: 3px;
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
  opacity: 0;
  animation: fadeInLoader 0.4s ease 2.2s forwards;
}
@keyframes fadeInLoader {
  to { opacity: 1; }
}
.splash-loader-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #e91e8c, #f05a28, #7c3aed);
  border-radius: 2px;
  animation: loadBar 1.8s cubic-bezier(.4,0,.6,1) 2.2s forwards;
}
@keyframes loadBar {
  0%   { width: 0%; }
  60%  { width: 80%; }
  100% { width: 100%; }
}

/* Partículas de fondo */
.splash-particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}
.splash-particle {
  position: absolute;
  border-radius: 50%;
  opacity: 0;
  animation: floatParticle linear infinite;
}
@keyframes floatParticle {
  0%   { transform: translateY(100vh) scale(0); opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 0.6; }
  100% { transform: translateY(-20px) scale(1); opacity: 0; }
}

/* Salida del splash */
.splash-screen.hiding {
  animation: splashFadeOut 0.6s ease forwards;
}
@keyframes splashFadeOut {
  0%   { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.05); }
}

/* ===== SVG ICONS ===== */
.icon { display:inline-block; vertical-align:middle; flex-shrink:0; }
.nav-icon { display:flex; align-items:center; justify-content:center; width:22px; }
.nav-icon svg { display:block; }
.bn-icon { display:flex; align-items:center; justify-content:center; }
.bn-icon svg { display:block; }
.quick-btn svg { display:block; }
.btn-icon svg { display:block; }
.btn-send svg { display:block; }

/* Íconos en tarjetas de materia — generados por JS */
.materia-card-icon svg { width:28px; height:28px; color:var(--primary); }
.stat-card .stat-icon svg { width:28px; height:28px; }

/* Tema oscuro — los íconos se adaptan automáticamente via currentColor */
[data-theme="dark"] .nav-item svg { stroke:currentColor; }

/* Tamaño íconos en móvil */
@media(max-width:768px){
  .nav-icon svg { width:18px; height:18px; }
  .bn-icon svg  { width:22px; height:22px; }
}

/* ===== KATEX — Renderizado matemático ===== */
.katex { font-size: 1.1em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 8px 0; }
.katex-display > .katex { max-width: 100%; }

/* Modo oscuro */
[data-theme="dark"] .katex { color: #f1f5f9; }
[data-theme="dark"] .katex-html { color: #f1f5f9; }

/* Dentro de burbujas de chat */
.msg-bubble .katex { font-size: 1em; }
.msg.user .msg-bubble .katex { color: #fff; }
.msg.user .msg-bubble .katex svg { color: #fff; fill: #fff; }

/* Dentro de resultados */
.resultado-content .katex-display {
  background: var(--bg2);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  margin: 10px 0;
  border-left: 3px solid var(--primary);
}
.resultado-content .katex {
  font-size: 1.15em;
}

/* ===== MODO OFFLINE ===== */
.offline-banner {
  position: fixed;
  top: var(--topbar-h);
  left: var(--sidebar-w);
  right: 0;
  background: #92400e;
  color: #fef3c7;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 90;
  transition: left var(--transition);
}
@media(max-width:768px){
  .offline-banner { left: 0; top: var(--topbar-h); }
}

/* ===== HERRAMIENTAS — CALCULADORA ===== */
.calc-wrapper{display:flex;justify-content:center;padding:16px 0}
.calc-container{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);width:100%;max-width:380px;box-shadow:var(--shadow-md);overflow:hidden}
.calc-display{background:#0f172a;padding:16px 18px;text-align:right;min-height:80px;display:flex;flex-direction:column;justify-content:flex-end}
.calc-expression{font-size:14px;color:#64748b;min-height:20px;word-break:break-all}
.calc-result{font-size:36px;font-weight:700;color:#f1f5f9;word-break:break-all}
.calc-mode-row{display:flex;border-bottom:1px solid var(--border)}
.calc-mode-btn{flex:1;padding:8px;border:none;background:var(--bg2);font-size:13px;font-weight:500;color:var(--text2);transition:all var(--transition)}
.calc-mode-btn.active{background:var(--primary);color:#fff}
.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--border)}
.calc-sci{grid-template-columns:repeat(6,1fr)}
.calc-btn{padding:16px 8px;border:none;background:var(--surface);font-size:18px;font-weight:500;color:var(--text);cursor:pointer;transition:background var(--transition)}
.calc-btn:hover{background:var(--bg2)}
.calc-btn:active{background:var(--border)}
.calc-btn.span2{grid-column:span 2}
.btn-clear{background:#fef2f2;color:#ef4444}
.btn-clear:hover{background:#fee2e2}
.btn-op{background:var(--primary-light);color:var(--primary);font-weight:700}
.btn-op:hover{background:var(--primary);color:#fff}
.btn-equals{background:var(--primary);color:#fff;font-weight:700;font-size:22px}
.btn-equals:hover{background:var(--primary-dark)}
.btn-fn{font-size:13px;background:#f0fdf4;color:#16a34a}
.btn-fn:hover{background:#16a34a;color:#fff}
.calc-history{padding:10px 14px;max-height:120px;overflow-y:auto;border-top:1px solid var(--border)}
.calc-hist-item{display:flex;justify-content:space-between;font-size:13px;padding:3px 0;border-bottom:1px solid var(--border)}
.calc-hist-expr{color:var(--text2);truncate:ellipsis;overflow:hidden;max-width:60%}
.calc-hist-res{font-weight:600;color:var(--primary)}
@media(max-width:480px){
  .calc-btn{padding:14px 4px;font-size:16px}
  .btn-fn{font-size:11px}
  .calc-result{font-size:28px}
}

/* ===== HERRAMIENTAS — TABLA PERIÓDICA ===== */
.tabla-controls{margin-bottom:16px;display:flex;flex-direction:column;gap:10px}
.tabla-legend{display:flex;flex-wrap:wrap;gap:6px}
.legend-item{font-size:11px;padding:3px 8px;border-radius:20px;border:1px solid;font-weight:500;cursor:default}
.tabla-wrapper{overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:8px}
.tabla-grid{display:grid;grid-template-columns:repeat(18,minmax(52px,1fr));grid-template-rows:repeat(10,auto);gap:3px;min-width:960px}
.tabla-element{border:1.5px solid transparent;border-radius:6px;padding:4px 3px;cursor:pointer;transition:transform .15s,box-shadow .15s;text-align:center;min-width:52px}
.tabla-element:hover{transform:scale(1.12);box-shadow:0 4px 12px rgba(0,0,0,.2);z-index:10;position:relative}
.tabla-element.dimmed{opacity:.15}
.elem-num{font-size:9px;color:var(--text3);text-align:left}
.elem-sym{font-size:18px;font-weight:800;line-height:1}
.elem-name{font-size:8px;color:var(--text2);margin-top:1px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.elem-mass{font-size:8px;color:var(--text3)}
.tabla-marker{border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;color:var(--text2);border:1.5px dashed var(--border)}

/* Modal de elemento */
.elemento-modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:500;padding:16px}
.elemento-card{background:var(--surface);border-radius:var(--radius);padding:24px;width:100%;max-width:400px;box-shadow:var(--shadow-lg);position:relative}
.elemento-close{position:absolute;top:12px;right:14px;background:none;border:none;font-size:20px;color:var(--text2);cursor:pointer}
.elem-modal-main{border:2px solid;border-radius:var(--radius);padding:16px;text-align:center;margin-bottom:18px}
.elem-modal-num{font-size:13px;color:var(--text2)}
.elem-modal-sym{font-size:52px;font-weight:900;line-height:1}
.elem-modal-name{font-size:18px;font-weight:700;margin-top:4px}
.elem-modal-mass{font-size:14px;color:var(--text2);margin-top:2px}
.elem-props{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:16px}
.elem-prop{background:var(--bg2);border-radius:var(--radius-sm);padding:10px;display:flex;flex-direction:column;gap:3px}
.elem-prop.span2{grid-column:span 2}
.elem-prop span{font-size:11px;color:var(--text2);text-transform:uppercase;letter-spacing:.05em}
.elem-prop strong{font-size:14px}

/* ===== CALCULADORA ESTILO CASIO fx-82ES ===== */
.casio-wrapper{display:flex;justify-content:center;padding:16px 0}
.casio-calc{
  background:#1a1a2e;
  border-radius:12px;
  width:100%;max-width:340px;
  padding:12px;
  box-shadow:0 8px 32px rgba(0,0,0,.5), inset 0 1px 0 rgba(255,255,255,.05);
  border:2px solid #0d0d1a;
}

/* Header */
.casio-header{display:flex;justify-content:space-between;align-items:center;padding:4px 6px 8px;border-bottom:1px solid #333}
.casio-brand{font-size:13px;font-weight:800;color:#ccc;letter-spacing:1px}
.casio-model{font-size:10px;color:#888}

/* Display */
.casio-display{
  background:#c8d6a0;
  border-radius:6px;
  padding:10px 12px;
  margin:8px 0;
  min-height:72px;
  display:flex;flex-direction:column;justify-content:space-between;
  border:2px solid #8a9a60;
  box-shadow:inset 0 2px 6px rgba(0,0,0,.3);
  font-family:'Courier New',monospace;
}
.casio-display-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}
.casio-mode-indicator{font-size:10px;color:#446;font-weight:600}
.casio-angle{font-size:10px;color:#446;font-weight:700;background:rgba(0,0,0,.1);padding:1px 4px;border-radius:3px}
.casio-expr{font-size:14px;color:#223;min-height:20px;word-break:break-all;text-align:right}
.casio-result{font-size:24px;font-weight:700;color:#112;text-align:right;letter-spacing:-0.5px}
.calc-cursor{animation:blink .8s step-end infinite;color:#446}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}

/* Botones Casio */
.casio-row{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;margin-bottom:4px}
.casio-row-num{gap:5px}

.casio-btn{
  background:linear-gradient(180deg,#2a2a4a,#1a1a30);
  border:1px solid #444;
  border-bottom:3px solid #0a0a1a;
  border-radius:5px;
  color:#ddd;
  font-size:11px;
  padding:6px 2px 5px;
  cursor:pointer;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:36px;
  transition:all .08s;
  position:relative;
}
.casio-btn:active{
  border-bottom-width:1px;
  transform:translateY(1px);
  background:linear-gradient(180deg,#1a1a30,#2a2a4a);
}
.casio-btn:hover{background:linear-gradient(180deg,#3a3a5a,#2a2a4a);}

.btn-top{font-size:8px;color:#ff9900;line-height:1;margin-bottom:1px;font-weight:600}
.btn-main{font-size:11px;color:#eee;line-height:1;font-weight:500}

/* Shift */
.casio-btn-shift{background:linear-gradient(180deg,#3a2a0a,#2a1a00);border-color:#a06010}
.casio-btn-shift.active{background:linear-gradient(180deg,#ff9900,#cc6600);color:#000}

/* ON */
.casio-btn-on{background:linear-gradient(180deg,#0a2a0a,#001a00);border-color:#206020;color:#44cc44}

/* Números */
.casio-btn-num{
  background:linear-gradient(180deg,#3a3a4a,#282838);
  font-size:16px;font-weight:700;color:#fff;
  border-color:#555;
  min-height:40px;
}
.casio-btn-num:hover{background:linear-gradient(180deg,#4a4a5a,#383848)}

/* Operadores */
.casio-btn-op{
  background:linear-gradient(180deg,#2a2a2a,#1a1a1a);
  font-size:16px;font-weight:700;color:#fff;
  border-color:#555;min-height:40px;
}

/* DEL */
.casio-btn-del{background:linear-gradient(180deg,#3a1a1a,#2a0a0a);border-color:#883333}
.casio-btn-del .btn-main{color:#ff6666;font-size:13px;font-weight:700}

/* AC */
.casio-btn-ac{background:linear-gradient(180deg,#1a3a1a,#0a2a0a);border-color:#338833}
.casio-btn-ac .btn-main{color:#44ff44;font-size:13px;font-weight:700}

/* Trig */
.casio-btn-trig .btn-main{color:#88ddff}
.casio-btn-trig .btn-top{color:#ff9900}

/* Mem */
.casio-btn-mem .btn-main{color:#ffdd44}

/* Ans */
.casio-btn-ans .btn-main{color:#aaffaa;font-size:12px}

/* Igual */
.casio-btn-equals{
  background:linear-gradient(180deg,#cc4400,#882200);
  border-color:#ff6600;
  border-bottom:3px solid #440000;
  font-size:20px;font-weight:900;color:#fff;
  min-height:40px;
}
.casio-btn-equals:hover{background:linear-gradient(180deg,#ee5500,#aa3300)}
.casio-btn-equals:active{border-bottom-width:1px;transform:translateY(1px)}

/* Historial */
.calc-history{
  margin-top:8px;padding:6px;
  background:rgba(0,0,0,.3);
  border-radius:4px;
  max-height:100px;overflow-y:auto;
  border:1px solid #333;
}
.calc-hist-item{display:flex;justify-content:space-between;font-size:11px;padding:2px 4px;border-bottom:1px solid #333;font-family:monospace}
.calc-hist-expr{color:#aaa;overflow:hidden;max-width:60%;text-overflow:ellipsis;white-space:nowrap}
.calc-hist-res{color:#ff9900;font-weight:600}

/* Responsive móvil */
@media(max-width:480px){
  .casio-calc{max-width:100%}
  .casio-btn{min-height:32px;padding:4px 1px}
  .casio-btn-num{min-height:36px;font-size:14px}
  .btn-main{font-size:10px}
  .btn-top{font-size:7px}
  .casio-result{font-size:20px}
}