:root {
    --bg-color: #0b0f19;       /* Fondo general oscuro/azulado profundo */
    --card-bg: #000000;        /* Tarjeta en Negro Absoluto (como el footer) */
    --text-main: #ffffff;      /* Texto principal Blanco */
    --text-muted: rgba(255, 255, 255, 0.68); /* Gris suave corporativo */
    --primary: #ffffff;        /* Detalles primarios en Blanco */
    --border-color: rgba(255, 255, 255, 0.12); /* Bordes sutiles idénticos al footer */
    --result-bg: #0b0f19;      /* Fondo de los inputs/resultado */
    --accent-glow: #34d399;    /* Verde esmeralda para el resultado del Hash */
}

* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.container { 
    flex-grow: 1; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    padding: 3rem 1rem; 
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 3rem 2.5rem;
    width: 100%;
    max-width: 650px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
}

.card-header h1 { 
    font-size: 2rem; 
    font-weight: 900; 
    margin-bottom: 0.6rem; 
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.subtitle { 
    color: var(--text-muted); 
    font-size: 0.95rem; 
    margin-bottom: 2.5rem; 
    line-height: 1.6;
}

.form-group { 
    display: flex; 
    flex-direction: column; 
    gap: 0.6rem; 
    margin-bottom: 1.8rem; 
}

label { 
    font-size: 0.8rem; 
    font-weight: 700; 
    text-transform: uppercase; 
    letter-spacing: 0.08em; 
    color: var(--text-muted); 
}

textarea {
    width: 100%; 
    padding: 1.2rem; 
    font-size: 1rem; 
    border: 1px solid var(--border-color); 
    border-radius: 8px;
    background-color: var(--result-bg); 
    color: var(--text-main); 
    outline: none; 
    resize: vertical; 
    min-height: 110px;
    font-family: inherit;
    transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

textarea:focus { 
    border-color: rgba(255, 255, 255, 0.4); 
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.05);
}

.selector-group select {
    padding: 0.7rem 1.2rem; 
    background: var(--result-bg); 
    color: var(--text-main); 
    border: 1px solid var(--border-color); 
    border-radius: 6px; 
    outline: none; 
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: border-color 0.25s;
}

.selector-group select:focus {
    border-color: rgba(255, 255, 255, 0.4);
}

.result-section { 
    display: flex; 
    flex-direction: column; 
    gap: 0.6rem; 
    margin-top: 0.5rem;
}

.hash-box-wrapper { 
    display: flex; 
    background-color: var(--result-bg); 
    border: 1px solid var(--border-color); 
    border-radius: 8px; 
    overflow: hidden; 
    transition: border-color 0.25s;
}

.hash-box-wrapper:focus-within {
    border-color: var(--accent-glow);
}

.hash-text {
    padding: 1.2rem; 
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; 
    font-size: 1.05rem; 
    word-break: break-all; 
    flex-grow: 1; 
    line-height: 1.5;
    color: var(--accent-glow); 
    min-height: 58px; 
    display: flex; 
    align-items: center;
}

.btn-copy {
    background: transparent; 
    border: none; 
    border-left: 1px solid var(--border-color); 
    padding: 0 1.5rem;
    cursor: pointer; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    font-size: 1.1rem;
    transition: background-color 0.2s ease;
}

.btn-copy:hover { 
    background-color: rgba(255, 255, 255, 0.05); 
}