/* =========================================
   VARIABILI CSS - COLOR CODING E ACCESSIBILITÀ
   ========================================= */
:root {
    /* Colori di base - alto contrasto, niente bianco puro sparato */
    --bg-color: #f8fafc; /* Grigio/blu chiarissimo, riposante per gli occhi */
    --text-color: #0f172a; /* Nero/blu scuro per massimo contrasto senza affaticare */
    --card-bg: #ffffff;
    
    /* Colori tematici DSA */
    --col-piana: #10b981; /* Verde smeraldo (rilassante) */
    --col-solida: #3b82f6; /* Blu cielo */
    --col-piana-light: #d1fae5;
    --col-solida-light: #dbeafe;
    
    /* Colori logici Matematica */
    --col-incognita: #2563eb; /* Blu per la x */
    --col-numero: #e11d48; /* Rosso/cremisi per la costante numerica */
    --col-operatore: #64748b; /* Grigio per gli operatori */
    
    /* Colori UI */
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --border-color: #e2e8f0;
    
    /* Spaziature generose (DSA-friendly) */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Tipografia */
    --font-main: 'Lexend', sans-serif;
    --border-radius: 12px;
    --border-radius-lg: 20px;

    /* Typo responsiva */
    --fs-h1: clamp(1.6rem, 6vw, 3rem);
    --fs-h2: clamp(1.35rem, 5vw, 2.5rem);
    --fs-subtitle: clamp(1rem, 3.5vw, 1.3rem);
}

/* =========================================
   RESET E BASE
   ========================================= */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.7; /* Line-height generoso per leggibilità */
    font-size: 18px; /* Base grande */
    overflow-y: scroll;
}

/* =========================================
   NAVBAR
   ========================================= */
.navbar {
    position: sticky;
    top: 0;
    background-color: var(--card-bg);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
}

@media (max-width: 1024px) {
    .navbar {
        padding: var(--spacing-sm);
    }
    .navbar-nav {
        gap: 8px;
    }
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary);
}

.navbar-nav {
    display: flex;
    gap: var(--spacing-sm);
}

.nav-btn {
    background: transparent;
    border: none;
    font-family: var(--font-main);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-color);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background-color: var(--bg-color);
}

.nav-btn.active {
    background-color: var(--primary);
    color: white;
}

.menu-toggle {
    display: none;
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--primary);
    cursor: pointer;
    z-index: 1001;
}

/* =========================================
   DROPDOWN MENU
   ========================================= */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: var(--card-bg);
    min-width: 280px;
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
    border-radius: var(--border-radius);
    padding: var(--spacing-xs);
    z-index: 1000;
    top: 100%;
    left: 0;
    /* Rimosso margin-top per evitare buchi "morti", uso un border trasparente per distanziare visivamente se necessario */
    border: 1px solid var(--border-color);
    border-top: 4px solid transparent; 
    background-clip: padding-box;
}

.dropdown-last .dropdown-content {
    left: auto !important;
    right: 0 !important;
}

.nav-dropdown:hover .dropdown-content,
.dropdown-toggle:hover + .dropdown-content,
.dropdown-content:hover {
    display: block;
    animation: fadeInDropdown 0.2s ease-in-out;
}

.dropdown-content .nav-btn {
    width: 100%;
    text-align: left;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 4px;
    font-size: 1.05rem;
    white-space: nowrap;
}

.dropdown-content .nav-btn:last-child {
    margin-bottom: 0;
}

@keyframes fadeInDropdown {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =========================================
   LAYOUT PRINCIPALE
   ========================================= */
.content-area {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

@media (max-width: 600px) {
    .content-area {
        padding: var(--spacing-md) var(--spacing-xs);
    }
}

.view-section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.view-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1024px) {
    .menu-toggle {
        display: block;
    }

    .navbar-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--card-bg);
        flex-direction: column;
        padding: 80px var(--spacing-md) var(--spacing-md);
        box-shadow: -5px 0 15px rgba(0,0,0,0.1);
        transition: right 0.3s ease-in-out;
        z-index: 1000;
        gap: var(--spacing-xs);
        overflow-y: auto;
    }

    .navbar-nav.open {
        right: 0;
    }

    .nav-dropdown {
        width: 100%;
    }

    .dropdown-content {
        position: static;
        display: none;
        width: 100%;
        box-shadow: none;
        border: none;
        padding-left: var(--spacing-md);
        background-color: var(--bg-color);
        animation: none;
    }

    .nav-dropdown.open .dropdown-content {
        display: block;
    }

    .nav-btn {
        width: 100%;
        justify-content: flex-start;
        padding: 12px;
    }

    .dropdown-toggle::after {
        content: '';
        margin-left: auto;
    }
}

/* =========================================
   HOME PAGE
   ========================================= */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.hero h1 {
    font-size: var(--fs-h1);
    margin-bottom: var(--spacing-sm);
    color: var(--primary);
}

.hero .subtitle {
    font-size: var(--fs-subtitle);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    color: var(--operatore);
}

.home-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.home-card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-align: left;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.home-card i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.home-card h3 {
    font-size: 1.4rem;
    margin-bottom: var(--spacing-xs);
}

.home-card p {
    font-size: 1.1rem;
    color: #475569;
}

.home-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1);
}

/* =========================================
   GEOMETRIA E TABS
   ========================================= */
.section-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.section-header h2 {
    font-size: var(--fs-h2);
    color: var(--primary);
    margin-bottom: var(--spacing-md);
}

.tabs {
    display: inline-flex;
    background-color: #e2e8f0;
    padding: 6px;
    border-radius: var(--border-radius-lg);
}

.tab-btn {
    background: transparent;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1.1rem;
    font-weight: 600;
    font-family: inherit;
    color: #475569;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.2s;
}

.tab-btn.active {
    background-color: var(--card-bg);
    color: var(--text-color);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s;
}

.tab-content.active {
    display: block;
}

/* =========================================
   CARD GEOMETRIA
   ========================================= */
.geo-card {
    background-color: var(--card-bg);
    border: 3px solid;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
}

.tipo-piana {
    border-color: var(--col-piana);
}

.tipo-solida {
    border-color: var(--col-solida);
}

.geo-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px dashed var(--border-color);
}

.geo-header h3 {
    font-size: 1.8rem;
}

.geo-body {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    align-items: center;
}

@media(max-width: 768px) {
    .geo-body {
        grid-template-columns: 1fr;
    }
}

@media(max-width: 600px) {
    .geo-body {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }
    .geo-illustration {
        width: 100%;
        max-width: 200px;
    }
}

.geo-illustration {
    display: flex;
    justify-content: center;
    align-items: center;
    background: #f8fafc;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
}

.shape-svg {
    width: 200px;
    height: 200px;
}

.geo-formulas {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.formula-box {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    background-color: #f8fafc;
    border-left: 6px solid;
    font-size: 1.2rem;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    overflow: hidden;
}

.piana-box {
    border-left-color: var(--col-piana);
    background-color: var(--col-piana-light);
}

.solida-box {
    border-left-color: var(--col-solida);
    background-color: var(--col-solida-light);
}

.math-expr {
    font-size: 1.25rem;
    max-width: 100%;
    overflow-x: auto;
    display: block;
}

@media (max-width: 600px) {
    .formula-box {
        font-size: 1rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    .math-expr {
        font-size: 1rem;
    }
}

/* =========================================
   POTENZE E REGOLE
   ========================================= */
.rules-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.rule-card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    transition: transform 0.2s, box-shadow 0.2s;
    overflow: hidden;
    min-width: 0;
}

@media (max-width: 600px) {
    .rule-card {
        padding: var(--spacing-sm);
    }
}

.rule-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0,0,0,0.05);
    border-color: #cbd5e1;
}

.rule-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.rule-header h3 {
    font-size: 1.5rem;
    color: var(--primary);
}

.tts-small {
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
}

.rule-body {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #f8fafc;
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.rule-abstract {
    background-color: #e0e7ff;
    border: 2px solid #818cf8;
    color: #3730a3;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    flex: 1;
    min-width: 200px;
    font-size: 1.4rem;
    overflow-x: auto;
    overflow-y: hidden;
}

.rule-arrow {
    font-size: 2rem;
    color: var(--operatore);
}

.rule-example {
    background-color: #fee2e2;
    border: 2px solid #f87171;
    color: #991b1b;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    text-align: center;
    flex: 1;
    min-width: 250px;
    font-size: 1.4rem;
    overflow-x: auto;
    overflow-y: hidden;
}

@media(max-width: 768px) {
    .rule-body {
        flex-direction: column;
        align-items: stretch;
    }
    .rule-arrow {
        transform: rotate(90deg);
        text-align: center;
    }
    .rule-abstract, .rule-example {
        font-size: 1.1rem;
    }
}

/* =========================================
   EQUAZIONI SPIEGAZIONI E COLOR CODING
   ========================================= */
.color-legend {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    background: #e2e8f0;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 0.9rem;
    font-weight: 600;
}

.legend-incognita { color: var(--col-incognita); }
.legend-numero { color: var(--col-numero); }

.eq-flow {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

.flow-desc {
    font-size: 1.2rem;
    color: #475569;
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

/* Helper Class per colori nel testo */
.calc-var {
    color: var(--col-incognita);
    font-weight: 700;
    font-size: 1.2em;
}

.calc-num {
    color: var(--col-numero);
    font-weight: 700;
    font-size: 1.2em;
}

/* Step Layout */
.step-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: #f8fafc;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    overflow: hidden;
}

.step-num {
    background: var(--primary);
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content {
    flex-grow: 1;
    min-width: 0; /* prevent flex child overflow */
    overflow-x: auto;
}

.step-content h4 {
    color: #475569;
    margin-bottom: var(--spacing-xs);
}

.step-arrow {
    text-align: center;
    font-size: 2rem;
    color: var(--primary);
    padding: var(--spacing-xs) 0;
}

@media (max-width: 600px) {
    .step-card {
        flex-direction: column;
        align-items: flex-start;
    }
}

.step-final {
    background: #f0fdf4;
    border-color: #22c55e;
}

.step-final .step-num {
    background: #22c55e;
}

.eq-display {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px dashed #cbd5e1;
    text-align: center;
    font-family: monospace; /* Font mono-spaziato per allineare caratteri */
    letter-spacing: 2px;
    overflow-x: auto;
    word-break: break-word;
}

.text-big { font-size: clamp(1.3rem, 5vw, 2rem); }
.text-huge { font-size: clamp(2rem, 8vw, 3rem); }

/* Box Regole Delta */
.delta-box {
    background: #eff6ff;
    border: 3px solid #bfdbfe;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    overflow: hidden;
}

.delta-box h4 {
    font-size: 1.5rem;
    color: #1e3a8a;
    margin-bottom: var(--spacing-sm);
}

.delta-rules {
    list-style: none;
    text-align: left;
    display: block;
    width: 100%;
    max-width: 100%;
    font-size: 1.2rem;
    background: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--border-radius);
    border: 1px solid #dbeafe;
    box-sizing: border-box;
    overflow-x: auto;
}

.delta-rules li {
    margin-bottom: var(--spacing-xs);
    border-bottom: 1px solid #f1f5f9;
    padding-bottom: var(--spacing-xs);
}
.delta-rules li:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.final-box {
    background: #fef2f2;
    border-color: #fecaca;
}
.final-box h4 {
    color: #991b1b;
}

/* Util margin top helper */
.mt-xl {
    margin-top: var(--spacing-xl);
}

/* =========================================
   EDITOR EQUAZIONI
   ========================================= */
.editor-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--card-bg);
    border: 3px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 10px 25px -5px rgba(0,0,0,0.1);
}

.editor-display {
    background: #f8fafc;
    border: 3px solid #cbd5e1;
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    margin-bottom: var(--spacing-xl);
    overflow-x: auto;
    white-space: nowrap;
}

@media (max-width: 600px) {
    .editor-display {
        font-size: 2rem;
        padding: var(--spacing-sm);
        min-height: 90px;
    }
}

.editor-keyboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: var(--spacing-sm);
}

.key-btn {
    appearance: none;
    border: none;
    background: #f1f5f9;
    padding: var(--spacing-sm);
    font-size: 1.5rem;
    font-family: var(--font-main);
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    box-shadow: 0 4px 0px #cbd5e1;
    transition: all 0.1s;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60px;
}

.key-btn:active {
    transform: translateY(4px);
    box-shadow: 0 0px 0px #cbd5e1;
}

.key-math {
    background: #eff6ff;
    color: var(--col-incognita);
    box-shadow: 0 4px 0px #bfdbfe;
    border: 2px solid #bfdbfe;
}
.key-math:active {
    box-shadow: 0 0px 0px #bfdbfe;
}

.key-op {
    background: #fff1f2;
    color: var(--col-numero);
    box-shadow: 0 4px 0px #fecaca;
    border: 2px solid #fecaca;
}
.key-op:active {
    box-shadow: 0 0px 0px #fecaca;
}

.key-action {
    background: #f8fafc;
    color: #475569;
    border: 2px solid #e2e8f0;
}

.editor-hints {
    margin-top: var(--spacing-lg);
    text-align: center;
    color: var(--operatore);
    background: #f1f5f9;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: 0.95rem;
}

@media(max-width: 600px) {
    .editor-keyboard {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xs);
    }
    .key-btn {
        font-size: 1.2rem;
        min-height: 54px;
        padding: var(--spacing-xs);
    }
}

/* =========================================
   UTILITIES
   ========================================= */
.tts-btn {
    background-color: #f1f5f9;
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    color: var(--primary);
    font-size: 1.4rem;
    transition: all 0.2s;
}
.tts-btn:hover {
    background-color: #e2e8f0;
    transform: scale(1.05);
}

/* =========================================
   CALCOLATORE FRAZIONI
   ========================================= */
.fraction-calc-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    border: 2px dashed #cbd5e1;
    overflow-x: auto;
}

@media (max-width: 600px) {
    .fraction-calc-container {
        padding: var(--spacing-sm);
        gap: var(--spacing-xs);
    }
    /* Tabelle statistiche: scroll orizzontale su mobile */
    table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    /* Math card padding ridotto */
    .math-card {
        padding: 1rem;
    }
}

.fraction-input-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.fraction-input {
    width: 70px;
    height: 50px;
    text-align: center;
    font-size: 1.5rem;
    font-family: var(--font-main);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: #f8fafc;
    color: var(--text-color);
    transition: border-color 0.2s;
}

.fraction-input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
}

/* Rimuovi freccette numeriche nei browser webkit */
.fraction-input::-webkit-outer-spin-button,
.fraction-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.fraction-input[type=number] {
  appearance: textfield; /* Firefox */
}

.fraction-line {
    width: 100%;
    margin: 0;
    border: none;
    border-top: 3px solid var(--text-color);
}

.fraction-op-select {
    font-size: 2rem;
    padding: 5px 10px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background: #f1f5f9;
    color: var(--operatore);
    font-weight: bold;
    cursor: pointer;
    font-family: inherit;
}

.fraction-op-select:focus {
    outline: none;
    border-color: var(--primary);
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.2rem;
    font-family: var(--font-main);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: background-color 0.2s, transform 0.1s;
    font-weight: 600;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-primary:active {
    transform: translateY(2px);
}
/* =========================================
   BANNER INFORMATIVO (POTENZIAMENTE)
   ========================================= */
.info-banner {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 2px solid #3b82f6;
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-md) auto var(--spacing-xl);
    max-width: 900px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    animation: slideDown 0.5s ease-out;
}

.info-banner p {
    font-size: 1.15rem;
    font-weight: 500;
    color: #1e40af;
    margin: 0;
}

.btn-info {
    background-color: var(--primary);
    color: white !important;
    text-decoration: none !important;
    padding: 10px 20px;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 0px #4338ca;
    white-space: nowrap;
}

.btn-info:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 0px #4338ca;
}

.btn-info:active {
    transform: translateY(2px);
    box-shadow: 0 0px 0px #4338ca;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@media(max-width: 768px) {
    .info-banner {
        flex-direction: column;
        text-align: center;
    }
}

/* =========================================
   PITAGORA SPECIFICO
   ========================================= */
#pitagora-result {
    animation: fadeIn 0.4s ease-in-out;
}

.math-input:focus {
    outline: none;
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.1);
}

#pitagora .rule-body {
    align-items: flex-start;
}

@media (max-width: 900px) {
    #pitagora .rule-body {
        flex-direction: column;
        align-items: center;
    }
}

/* =========================================
   PITAGORA SPECIFICO
   ========================================= */
#pitagora .tabs .tab-btn {
    padding: 10px 20px;
    font-size: 1rem;
    border-radius: 8px;
    margin: 0;
}

#pitagora .tabs .tab-btn.active {
    background-color: var(--primary);
    color: white;
}

#group-pit-a, #group-pit-b, #group-pit-c {
    animation: fadeIn 0.3s ease-out;
}

/* =========================================
   DIVISIBILITÀ TOOL
   ========================================= */
.div-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.div-badge span {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-color);
    margin-bottom: 5px;
}

.div-badge i {
    font-size: 1.5rem;
    color: #94a3b8;
}

.div-badge.is-yes {
    border-color: #22c55e;
    background: #f0fdf4;
    transform: scale(1.05);
    box-shadow: 0 10px 15px -3px rgba(34, 197, 94, 0.1);
}

.div-badge.is-yes i {
    color: #22c55e;
}

.div-badge.is-no {
    border-color: #ef4444;
    background: #fef2f2;
    opacity: 0.7;
}

.div-badge.is-no i {
    color: #ef4444;
}