/* =========================================
       1. VARIABLES Y TEMAS
       ========================================= */
    :root{
        --ink:#0f172a;
        --muted:#475569;
        --border:#dbe3f6;
        --brand:#3b82f6;
        --brand-hover:#1d4ed8;
        --accent:#22c55e;
        --bgmask:rgba(15,23,42,0.7);
        --danger:#ef4444;
        --warning:#f97316;
        
        --bg-body: #f8fafc;
        --bg-panel: #ffffff;
        --bg-input: #ffffff;
        --bg-screen: #f1f5f9; 
        --bg-overlay: rgba(255,255,255,0.95);
        --shadow: rgba(0,0,0,0.1);
        --card-hover: rgba(0,0,0,0.05);
    }

    [data-theme="dark"] {
        --ink: #f1f5f9;
        --muted: #94a3b8;
        --border: #334155;
        --brand: #60a5fa; 
        --brand-hover: #3b82f6;
        --accent: #4ade80;
        --bgmask: rgba(0,0,0,0.85);
        --danger: #f87171;
        --warning: #fb923c;
        
        --bg-body: #0f172a;
        --bg-panel: #1e293b;
        --bg-input: #0f172a;
        --bg-screen: #020617;
        --bg-overlay: rgba(15, 23, 42, 0.95);
        --shadow: rgba(0,0,0,0.5);
        --card-hover: rgba(255,255,255,0.05);
    }

    /* =========================================
       2. ESTILOS GENERALES
       ========================================= */
    *{box-sizing:border-box}
    html,body{height:100%;margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial; background-color: var(--bg-body); color: var(--ink); transition: background-color 0.3s, color 0.3s;}
    
    .screen{min-height:100vh;display:none;flex-direction: column; align-items:center;justify-content:center;padding:28px;background-size:cover;background-position:center; background-color: var(--bg-screen);}
    .screen.active{display:flex}
    
    #welcome{background:#eef url('https://images.unsplash.com/photo-1596495577886-d920f1fb7238') center/cover;}
    [data-theme="dark"] #welcome { background-image: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://images.unsplash.com/photo-1596495577886-d920f1fb7238'); }

    .title-wrap{background:var(--bg-panel);border-radius:16px;padding:24px;max-width:720px;text-align:center;box-shadow:0 10px 15px var(--shadow); border: 1px solid var(--border);}
    
    h1{font-size:3rem;margin:0 0 10px;}
    .logo-app { color: var(--ink); font-weight: 800; }
    .logo-untes { color: var(--brand); font-family: "Brush Script MT", "Comic Sans MS", cursive; font-style: italic; font-weight: normal; }

    p{margin:0 0 20px; line-height: 1.5;}
    h2, h3 { color: var(--ink); margin-top: 0; }

    .btn{display:inline-block;padding:10px 20px;margin:5px;border:none;border-radius:8px;font-size:1rem;cursor:pointer;background:var(--brand);color:#fff;transition:background 0.3s}
    .btn:hover{background:var(--brand-hover)}
    .btn.secondary{background:var(--muted);margin-left:0; color: #fff;}
    .btn.secondary:hover{background:var(--ink)}
    .btn.danger{background:var(--danger); color: #fff;}
    .btn.warning{background:var(--warning); color: #fff;}
    .btn.success{background:var(--accent); color: #fff;}
    .btn:disabled { opacity: 0.6; cursor: not-allowed; }
    
    .btn-fav {
        background: transparent;
        border: 2px solid var(--danger);
        color: var(--danger);
        font-size: 1.5rem;
        cursor: pointer;
        border-radius: 50%;
        width: 50px;
        height: 50px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        transition: all 0.2s;
        margin-left: 10px;
    }
    .btn-fav:hover { transform: scale(1.1); background: rgba(239, 68, 68, 0.1); }
    .btn-fav.active { background: var(--danger); color: white; box-shadow: 0 0 10px var(--danger); }

    .verified-icon { color: var(--accent); margin-left: 5px; font-size: 1.1rem; vertical-align: middle; }
    .verification-box {
        text-align: center; margin: 10px 0; padding: 10px; 
        background-color: rgba(34, 197, 94, 0.1); 
        border: 1px solid var(--accent); 
        color: var(--accent); 
        border-radius: 6px; font-weight: bold;
    }

    #flashcardContainer {
        border: 1px solid var(--border);
        border-radius: 8px;
        padding: 20px;
        margin-top: 15px;
        background: var(--bg-screen);
        min-height: 200px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        text-align: center;
    }
    .card-face {
        min-height: 100px;
        width: 100%;
        padding: 15px;
        background: var(--bg-panel);
        border-radius: 8px;
        box-shadow: 0 4px 6px var(--shadow);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.2rem;
        font-weight: bold;
        transition: all 0.5s;
        cursor: pointer;
        user-select: none;
        border: 2px dashed var(--brand);
    }
    .card-face.back {
        border-color: var(--accent);
        color: var(--ink);
        background: var(--bg-panel);
    }

    #auth{background-color:var(--bg-body)}
   /* Panel principal con altura máxima para evitar que se desborde del monitor */
    .panel{display:flex;flex-wrap:wrap;width:100%;max-width:1000px;max-height:90vh;background:var(--bg-panel);border-radius:12px;box-shadow:0 25px 50px var(--shadow);overflow:hidden;position:relative; border: 1px solid var(--border);}
    
    /* Scroll interno activado, altura máxima forzada y margen inferior ampliado para rescatar el botón */
    .form-wrap {
        padding: 25px 35px 40px 35px; /* 40px de margen inferior para dar espacio al botón */
        flex: 1;
        min-width: 300px; 
        overflow-y: auto;
        max-height: 90vh; /* El truco: forzamos el límite aquí también para que el scroll actúe a tiempo */
    }
    .form-wrap h2{margin-top:0;border-bottom:2px solid var(--border);padding-bottom:8px; margin-bottom:12px; font-size:1.5rem;}
    
    /* Tipografía compacta y márgenes ajustados para los campos */
    label{display:block;margin-top:8px;margin-bottom:3px;font-weight:600; font-size:0.9rem;}
    input[type="text"],input[type="password"],select,textarea, input[type="file"]{
        width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:6px;margin-bottom:10px;
        background-color: var(--bg-input); color: var(--ink); font-size:0.95rem;
    }
    textarea{min-height:100px; font-family: inherit;}
    .hidden{display:none!important}
    .group{display:flex;flex-wrap:wrap;gap:10px}
    
    #subjects, #profile, #adminPanelScreen { background-color: var(--bg-screen); } 

    #subjects .container{display:grid;grid-template-columns:1fr 2fr;gap:20px;max-width:1200px;width:100%;margin:auto}
    #subjects h3,#subjects h3{margin-top:0}
    #subjects .box{background:var(--bg-panel);padding:20px;border-radius:8px;box-shadow:0 4px 6px var(--shadow); border: 1px solid var(--border);}
    #subjects .list button{display:block;width:100%;text-align:left}
    .note-item{display:flex;justify-content:space-between;align-items:center;padding:10px;border-bottom:1px dotted var(--border)}
    .note-item:last-child{border-bottom:none}
    
    #filterControls {
        display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
        margin-bottom: 15px; padding: 10px; background: var(--bg-input);
        border-radius: 6px; border: 1px solid var(--border); gap: 10px;
    }
    #paginationControls { display: flex; align-items: center; gap: 5px; margin-left: auto; }
    #paginationControls button { padding: 5px 10px; margin: 0; }
    #paginationControls span { font-weight: bold; }

    #protectedModal, #structuredSearchModal, #requestNoteModal, #requestsModal, #requestEditorModal, #adminAuthModal, #teacherCourseModal, #flashcardsModal, #chatModal, #dashNotificationModal {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bgmask); z-index: 2500; display: none; padding: 20px;
}
#protectedModal.active, #structuredSearchModal.active, #requestNoteModal.active, #requestsModal.active, #requestEditorModal.active, #adminAuthModal.active, #teacherCourseModal.active, #flashcardsModal.active, #chatModal.active, #dashNotificationModal.active {
    display: flex; align-items: center; justify-content: center;
}
    .modal-content{background:var(--bg-panel);border-radius:12px;padding:30px;max-width:900px;width:100%;box-shadow:0 0 25px var(--shadow);max-height:100%;overflow-y: auto; color: var(--ink);} 
    #modalTitle{text-align:center;color:var(--brand);margin-top:0;margin-bottom:20px}
    
    .course-select-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:var(--bg-overlay);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:20px;text-align:center}
    .course-select-overlay h2{color:var(--brand)}

    .rating-stars { display: inline-block; font-size: 2rem; cursor: pointer; user-select: none; line-height: 1; }
    .rating-stars span { color: #ccc; transition: transform 0.1s, color: 0.1s; }
    .rating-stars span:hover { transform: scale(1.1); }
    
    .selection-step-container { padding: 10px; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 15px; }
    .selection-step-container p { font-weight: bold; color: var(--brand); border-bottom: 1px dotted var(--border); padding-bottom: 5px; margin-bottom: 10px; }
    .selection-step-container .group button { width: auto; min-width: 120px; margin: 5px; }

    .request-card { border: 1px solid var(--border); border-radius: 8px; padding: 15px; margin-bottom: 10px; background: var(--bg-panel); transition: box-shadow 0.2s; }
    .request-card:hover { box-shadow: 0 4px 12px var(--shadow); }
    .status-badge { padding: 4px 8px; border-radius: 12px; font-size: 0.8rem; font-weight: bold; text-transform: uppercase; display: inline-block; margin-bottom: 5px; }
    
    .status-pendiente { background: #ffedd5; color: #9a3412; }
    .status-borrador { background: #dbeafe; color: #1e40af; }
    .status-completada { background: #dcfce7; color: #166534; }
    .status-rechazada { background: #fee2e2; color: #991b1b; }
    .status-asignada { background: #e0f2fe; color: #0369a1; border: 1px solid #bae6fd; }

    #adminTrigger { color: #cbd5e1; font-size: 0.8rem; cursor: pointer; text-decoration: none; user-select: none; }
    #adminTrigger:hover { color: #94a3b8; }

    #adminTable { width: 100%; border-collapse: collapse; margin-top: 20px; font-size: 0.9rem; }
    #adminTable th, #adminTable td { border: 1px solid var(--border); padding: 8px; text-align: left; }
    #adminTable th { background-color: var(--bg-screen); color: var(--brand); }
    .status-active { color: var(--accent); font-weight: bold; }
    .status-inactive { color: var(--danger); font-weight: bold; }
    .status-missing-data { color: #991b1b; font-weight: bold; font-style: italic; }
    .action-btn-admin { padding: 4px 8px; font-size: 0.8rem; margin: 0; }

    .row-pending-review { background-color: rgba(254, 249, 195, 0.5) !important; }

    .avatar-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; margin-bottom: 15px; }
    .avatar-option { font-size: 2rem; cursor: pointer; border: 2px solid transparent; border-radius: 50%; text-align: center; background: var(--bg-screen); transition: all 0.2s; user-select: none; padding: 5px; }
    .avatar-option:hover { transform: scale(1.1); background: var(--border); }
    .avatar-option.selected { border-color: var(--brand); background: var(--bg-body); transform: scale(1.1); box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.3); }
    
    /* =========================================
       AJUSTE SEGURO DE PERFIL (EVITA DESBORDAMIENTO)
       ========================================= */
    #profile .title-wrap {
        max-height: 90vh;
        overflow-y: auto;
        padding: 25px 35px;
    }
    
    #userFavoritesContainer, #userCreatedNotesContainer, .backpack-section-wrapper, .trophy-case {
        max-height: 180px !important;
        overflow-y: auto;
    }

    .profile-avatar-large { font-size: 4rem; background: var(--bg-panel); border-radius: 50%; width: 100px; height: 100px; display: flex; align-items: center; justify-content: center; margin: 0 auto 10px; box-shadow: 0 4px 6px var(--shadow); border: 4px solid var(--brand); }
    
    .user-avatar-small { font-size: 1.4rem; margin-right: 8px; vertical-align: middle; display: inline-block; background: var(--bg-screen); border-radius: 50%; width: 32px; height: 32px; text-align: center; line-height: 32px; border: 1px solid var(--border); }

    #dashboard .container {
        max-width: 900px;
        width: 100%;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
        gap: 12px;
    }

    .dash-card {
        background: var(--bg-panel);
        padding: 15px;
        border-radius: 12px;
        box-shadow: 0 4px 6px var(--shadow);
        border: 1px solid var(--border);
        transition: transform 0.2s, box-shadow 0.2s;
    }

    .dash-card:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 15px var(--shadow);
    }

    .dash-welcome {
        grid-column: 1 / -1;
        text-align: center;
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .stat-number {
        font-size: 2rem;
        font-weight: bold;
        color: var(--brand);
        margin: 5px 0;
    }

    .motivation-quote {
        grid-column: 1 / -1;
        font-style: italic;
        color: var(--muted);
        margin-top: 5px;
        padding: 12px;
        border-left: 4px solid var(--accent);
        background: var(--bg-panel);
        border-radius: 0 4px 4px 0;
    }

    .dash-avatar {
        font-size: 3.2rem;
        margin-bottom: 5px;
        animation: float 3s ease-in-out infinite;
    }

    @keyframes float {
        0% { transform: translateY(0px); }
        50% { transform: translateY(-10px); }
        100% { transform: translateY(0px); }
    }

    #themeToggle {
        position: fixed;
        top: 20px;
        right: 20px;
        z-index: 1000;
        background: var(--bg-panel);
        border: 1px solid var(--border);
        border-radius: 50%;
        width: 45px;
        height: 45px;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem;
        box-shadow: 0 4px 6px var(--shadow);
    }
    
    #flashcardsModal .modal-content {
        max-width: 500px;
    }
/* EFECTO PARPADEO PARA AVISOS URGENTES */
@keyframes blink-alert {
    0% { background-color: #fee2e2; border-color: #fca5a5; }
    50% { background-color: #fff1f2; border-color: #fecdd3; }
    100% { background-color: #fee2e2; border-color: #fca5a5; }
}

.blink-active {
    animation: blink-alert 1.5s infinite ease-in-out;
    border: 2px solid #ef4444 !important;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.3);
}
/* =========================================
   ESTILOS DE NOTIFICACIONES (TOAST)
   ========================================= */
#toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    min-width: 250px;
    padding: 15px 20px;
    border-radius: 8px;
    background: var(--brand); /* Azul por defecto */
    color: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
    opacity: 0;
    transform: translateX(50px);
    animation: slideIn 0.3s forwards;
}

.toast.success { background: var(--accent); } /* Verde */
.toast.error   { background: var(--danger); } /* Rojo */
.toast.warning { background: var(--warning); } /* Naranja */

/* Animaciones */
@keyframes slideIn {
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideOut {
    to { opacity: 0; transform: translateX(100%); }
}
/* =========================================
   ESTILOS DE GAMIFICACIÓN (LOGROS)
   ========================================= */

/* Animación de rebote para el icono */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Vitrina de Trofeos en el Perfil */
.trophy-case {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 15px;
    background: var(--bg-input);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--border);
    margin-top: 10px;
}

.badge-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    opacity: 0.3; 
    filter: grayscale(100%);
    transition: all 0.3s;
    cursor: pointer; /* <--- AÑADIR ESTO */
    position: relative; /* Para asegurar el posicionamiento */
}

.badge-item:hover {
    transform: scale(1.1); /* Efecto visual al pasar el ratón */
}

.badge-item.unlocked {
    opacity: 1;
    filter: grayscale(0%);
    transform: scale(1.05);
}

.badge-icon {
    font-size: 2.5rem;
    margin-bottom: 5px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.badge-name {
    font-size: 0.7rem;
    font-weight: bold;
    line-height: 1.2;
}
/* Contador de progreso para medallas */
.badge-counter {
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--muted); /* Tono grisáceo (mismo tono) */
    color: white;
    font-size: 0.6rem;
    padding: 2px 5px;
    border-radius: 10px;
    font-weight: bold;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Si la medalla está desbloqueada, escondemos el contador o lo ponemos en dorado */
.badge-item.unlocked .badge-counter {
    display: none; 
}
/* =========================================
   NUEVO: VISTA DIVIDIDA (APUNTE + ARCHIVO)
   ========================================= */
.split-view-container {
    display: flex;
    gap: 20px;
    height: 80vh; /* Altura fija para permitir scroll interno */
    overflow: hidden;
}

.split-left {
    flex: 1;
    overflow-y: auto; /* Scroll independiente para el texto */
    padding-right: 10px;
}

.split-right {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.file-viewer {
    width: 100%;
    height: 100%;
    border: none;
    object-fit: contain; /* Para que las imágenes se ajusten bien */
}

/* En móviles, volvemos a poner uno debajo de otro */
@media (max-width: 768px) {
    .split-view-container {
        flex-direction: column;
        height: auto;
        overflow: visible;
    }
    .split-right {
        height: 500px; /* Altura forzada en móvil para el visor */
        margin-top: 20px;
    }
}


/* =========================================
   VISOR CON ZOOM DE BOTONES Y SCROLL
   ========================================= */
.zoom-wrapper {
    width: 100%;
    height: 100%;
    overflow: auto;  /* <--- ESTO ES LO IMPORTANTE: Permite barras de scroll */
    background: #525659; 
    position: relative;
    display: block; 
}

.zoom-content {
    display: block; 
    margin: 0 auto;
    transform-origin: top left;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    transition: width 0.2s ease; /* Suaviza el efecto de zoom */
}
/* =========================================
   NUEVO: ANIMACIÓN DE CAMPANA (NOTIFICACIÓN)
   ========================================= */
@keyframes bellRing {
    0%, 100% { transform: rotate(0); }
    10%, 30%, 50%, 70%, 90% { transform: rotate(10deg); }
    20%, 40%, 60%, 80% { transform: rotate(-10deg); }
}

/* --- ANIMACIÓN DE RESALTADO PARA BÚSQUEDA (MEJORADO) --- */
@keyframes highlight-pulse {
    0% { 
        outline: 3px solid var(--warning); 
        outline-offset: 2px; 
        transform: scale(1); 
    }
    50% { 
        outline: 5px solid gold; 
        outline-offset: 4px; 
        transform: scale(1.02); 
        box-shadow: 0 0 15px gold;
    }
    100% { 
        outline: 3px solid var(--warning); 
        outline-offset: 2px; 
        transform: scale(1); 
    }
}

.highlight-topic {
    animation: highlight-pulse 0.8s ease-in-out 3;
    z-index: 10;
    position: relative;
}

.notification-bell {
    display: inline-block;
    animation: bellRing 2s infinite;
    margin-left: 5px;
}
/* --- SISTEMA DE MEDALLAS --- */
.medal-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
    padding: 10px;
    background: var(--bg-screen);
    border-radius: 8px;
}

.medal-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 70px;
    text-align: center;
    opacity: 0.3; /* Por defecto apagadas */
    filter: grayscale(1);
    transition: all 0.4s ease;
}

.medal-item.unlocked {
    opacity: 1;
    filter: grayscale(0);
    transform: scale(1.1);
}

.medal-icon {
    font-size: 2rem;
    margin-bottom: 5px;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.medal-name {
    font-size: 0.65rem;
    font-weight: bold;
    color: var(--ink);
    line-height: 1;
}

/* Efecto de brillo para medallas desbloqueadas */
.medal-item.unlocked .medal-icon {
    animation: medal-shine 2s infinite alternate;
}

@keyframes medal-shine {
    from { filter: drop-shadow(0 0 2px gold); }
    to { filter: drop-shadow(0 0 8px gold) scale(1.05); }
}
/* =========================================
   NUEVO: POMODORO, MISIONES Y MODO FOCUS
   ========================================= */
.pomodoro-widget { background: var(--bg-panel); border: 2px solid var(--brand); border-radius: 8px; padding: 15px; text-align: center; margin-bottom: 20px; box-shadow: 0 4px 6px var(--shadow); }
.pomodoro-time { font-size: 3rem; font-weight: bold; font-family: monospace; color: var(--brand); margin: 10px 0; line-height: 1; }
.mission-item { display: flex; align-items: center; justify-content: space-between; padding: 10px; border-bottom: 1px dashed var(--border); }
.mission-item:last-child { border-bottom: none; }
.mission-item.completed { opacity: 0.5; }
.mission-item.completed .mission-desc { text-decoration: line-through; }

/* Ocultar elementos en Modo Concentración */
.focus-mode-active #noteRightCol, 
.focus-mode-active #fileToggleZone, 
.focus-mode-active #commentActionZone, 
.focus-mode-active hr, 
.focus-mode-active .btn-fav { display: none !important; }
.focus-mode-active #noteLeftCol { max-width: 900px; margin: 0 auto; width: 100%; border: none; box-shadow: none; }
.focus-mode-active .modal-content { background: var(--bg-body); border: none; box-shadow: none; max-width: 1000px; }
/* =========================================
       AJUSTE SEGURO DE ALTURA PARA EL PERFIL
       ========================================= */
       
    /* 1. Protegemos la tarjeta principal para que NUNCA supere el tamaño del monitor */
    #profile .title-wrap {
        max-height: 85vh; 
        overflow-y: auto; 
    }

    /* 2. Le ponemos un tope a las listas para que no crezcan infinitamente */
    #userFavoritesContainer, 
    #userCreatedNotesContainer, 
    .backpack-section-wrapper, 
    .trophy-case {
        max-height: 180px !important;
        overflow-y: auto !important;
        padding-right: 5px; /* Un poco de aire para que la barra de scroll no pise el texto */
    }