/* ==========================
   Reset & base
=========================== */
*{
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body{
    line-height: 1.6;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

/* ==========================
   Variabili tema
=========================== */
:root{
    /* Light */
    --bg: #f5f7fa;
    --text: #1f2937;
    --card: #ffffff;
    --border: #d1d5db;

    --input-bg: #ffffff;
    --input-text: #111827;

    --accent: #2563eb;
    --accent-hover: #1d4ed8;

    --shadow: 0 8px 24px rgba(0,0,0,0.08);
}

/* ==========================
   Tema scuro moderno
=========================== */
@media (prefers-color-scheme: dark){
    :root{
        --bg: #0f1115;
        --text: #e5e7eb;
        --card: #171a21;
        --border: #2a2f3a;

        --input-bg: #1c2029;
        --input-text: #f3f4f6;

        --accent: #4cc9f0;
        --accent-hover: #38bdf8;

        --shadow: 0 12px 32px rgba(0,0,0,0.7);
    }
}

body{
    background-color: var(--bg);
    color: var(--text);
}

/* ==========================
   Titoli
=========================== */
h1{
    text-align: center;
    margin-bottom: 20px;
    font-size: 2em;
    font-weight: 600;
}

/* ==========================
   Card / sezioni
=========================== */
.info, .lyrics, .controls{
    background-color: var(--card);
    padding: 20px;
    margin: 12px 0;
    border-radius: 14px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
}

/* ==========================
   Form
=========================== */
label{
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
}

input, textarea, select{
    width: 100%;
    padding: 12px;
    margin-bottom: 14px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background-color: var(--input-bg);
    color: var(--input-text);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
textarea:focus,
select:focus{
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(76,201,240,0.25);
}

textarea{
    resize: vertical;
}

/* ==========================
   Pulsanti
=========================== */
button{
    background-color: var(--accent);
    color: #0b0d11;
    border: none;
    padding: 10px 18px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.15s;
}

button:hover{
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

/* Pulsante principale */
.main-btn{
    font-size: 1.4em;
    padding: 14px 30px;
}

/* ==========================
   Gruppo pulsanti
=========================== */
#controls{
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin-top: 10px;
}

/* ==========================
   Responsive
=========================== */
@media (max-width: 600px){
    body{
        padding: 12px;
    }
}