:root {
    --bg-main: #05070f;
    --card-bg: rgba(15, 23, 42, 0.82);
    --card-border: rgba(56, 189, 248, 0.2);
    --card-border-glow: rgba(56, 189, 248, 0.6);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-blue: #38bdf8;
    --accent-hover: #0ea5e9;
    --radius-lg: 24px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    overflow: hidden;
    position: relative;
}

/* Sfondo ambientale dinamico */
.bg-cyber-glow {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: 
        radial-gradient(circle at 50% 30%, rgba(56, 189, 248, 0.15) 0%, transparent 60%),
        radial-gradient(circle at 20% 80%, rgba(14, 165, 233, 0.1) 0%, transparent 50%);
    z-index: -1;
    pointer-events: none;
    animation: bgPulse 10s infinite alternate ease-in-out;
}

@keyframes bgPulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.05); opacity: 1; }
}

/* Card di Login Ingrandita, Spaziosa e con Glassmorphism avanzato */
.login-card {
    background: var(--card-bg);
    padding: 3rem 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    width: 100%;
    max-width: 460px; /* Ingrandita rispetto ai 380px precedenti */
    border: 1px solid var(--card-border);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: relative;
    overflow: hidden;
    animation: slideUpFade 0.7s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideUpFade {
    from { opacity: 0; transform: translateY(30px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Dettaglio estetico superiore */
.login-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
}

.login-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-blue);
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.3);
    padding: 5px 12px;
    border-radius: 20px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.pulse-dot {
    width: 6px;
    height: 6px;
    background-color: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--accent-blue);
    animation: pulse 1.8s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; transform: scale(0.9); }
    50% { opacity: 1; transform: scale(1.3); }
}

h2 {
    margin: 0 0 6px 0;
    font-size: 26px;
    font-weight: 900;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.login-subtitle {
    font-size: 13.5px;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.input-group {
    margin-bottom: 1.4rem;
}

label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    font-size: 16px;
    pointer-events: none;
    opacity: 0.7;
}

input {
    width: 100%;
    padding: 0.95rem 1rem 0.95rem 2.8rem; /* Spazio per l'icona e più comodità d'uso */
    background: rgba(2, 6, 23, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: #fff;
    font-size: 15px;
    font-family: inherit;
    box-sizing: border-box;
    transition: all 0.3s ease;
    outline: none;
}

input:focus {
    border-color: var(--accent-blue);
    background: rgba(2, 6, 23, 0.9);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.25), 0 0 15px rgba(56, 189, 248, 0.15);
}

.login-btn {
    width: 100%;
    padding: 1rem;
    margin-top: 0.5rem;
    background: linear-gradient(135deg, #0284c7 0%, var(--accent-blue) 100%);
    border: none;
    border-radius: 12px;
    color: white;
    font-weight: 800;
    font-size: 15px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    box-shadow: 0 10px 25px -5px rgba(2, 132, 199, 0.5);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.login-btn svg {
    width: 18px;
    height: 18px;
    transition: transform 0.3s ease;
}

.login-btn:hover {
    background: linear-gradient(135deg, #0369a1 0%, var(--accent-hover) 100%);
    transform: translateY(-2px);
    box-shadow: 0 15px 30px -5px rgba(2, 132, 199, 0.7);
}

.login-btn:hover svg {
    transform: translateX(4px);
}

.login-btn:active {
    transform: scale(0.98);
}

.error-box {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(244, 63, 94, 0.15);
    border: 1px solid rgba(244, 63, 94, 0.4);
    color: #fda4af;
    font-size: 0.875rem;
    font-weight: 600;
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}

.error-icon {
    font-size: 18px;
    flex-shrink: 0;
}