@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
    --bg-dark: #0a0a0a;
    --card-bg: rgba(255, 255, 255, 0.03);
    --accent: #ffffff;
    --border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(12px);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-dark);
    color: #ffffff;
    height: 100dvh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Container Principale - Glass Effect */
.chat-window {
    width: 100%;
    height: 100%;
    max-width: 900px;
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: relative;
}

@media (min-width: 768px) {
    .chat-window {
        height: 85vh;
        border-radius: 30px;
        box-shadow: 0 25px 50px rgba(0,0,0,0.6);
        margin: 20px;
    }
}

/* Header - Blur più intenso */
.chat-header {
    padding: 25px 30px;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    z-index: 10;
    flex-shrink: 0;
}

.chat-header h2 {
    font-size: 1.4rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Area Messaggi */
#chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    scroll-behavior: smooth;
    min-height: 0;
}

/* Wrapper e Bolle */
.msg-wrapper {
    display: flex;
    width: 100%;
    animation: fadeIn 0.4s ease-out;
}

.user-wrapper { justify-content: flex-end; }
.ai-wrapper { justify-content: flex-start; }

.msg-bubble {
    max-width: 75%;
    padding: 18px 24px;
    border-radius: 24px;
    font-size: 1.05rem;
    line-height: 1.6;
    transition: var(--transition);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Messaggio Utente - Bianco con Glow */
.user-wrapper .msg-bubble {
    background: var(--accent);
    color: #0a0a0a;
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
}

/* Messaggio AI - Glass Bubble */
.ai-wrapper .msg-bubble {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    color: #e0e0e0;
    border-bottom-left-radius: 4px;
    border: 1px solid var(--border);
}

/* Input Area - La barra sotto */
.chat-input-area {
    padding: 24px 30px;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    display: flex;
    gap: 14px;
    align-items: center;
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

/* Campo Testo con Blur interno */
#user-input {
    flex: 1;
    padding: 18px 26px;
    border-radius: 50px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(5px);
    color: white;
    outline: none;
    font-family: inherit;
    transition: var(--transition);
    font-size: 17px;
}

#user-input:focus {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.15);
}

/* Bottone Invio con Blur e Hover */
#send-btn {
    width: 58px;
    height: 58px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    backdrop-filter: blur(10px);
    color: #0a0a0a;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
    flex-shrink: 0;
    font-size: 20px;
}

#send-btn:hover {
    transform: scale(1.05) translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
    filter: brightness(0.9);
}

#send-btn:active {
    transform: scale(0.95);
}

/* Scrollbar Stylata */
#chat-container::-webkit-scrollbar {
    width: 8px;
}

#chat-container::-webkit-scrollbar-track {
    background: transparent;
}

#chat-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

/* Animazioni */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(10px) scale(0.98); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0) scale(1); 
    }
}

/* --- LOGIN E COMPONENTI --- */

.login-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #1a1a1a 0%, #050505 100%);
    padding: 25px;
}

.login-box {
    width: 100%;
    max-width: 450px;
    padding: 50px 40px;
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border);
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    text-align: center;
    animation: fadeIn 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.login-box h2 {
    margin-bottom: 40px;
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -1px;
    background: linear-gradient(135deg, #ffffff 0%, #cccccc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Input del Login */
.login-box input {
    width: 100%;
    padding: 18px 24px;
    margin-bottom: 18px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(5px);
    color: white;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
    font-size: 17px;
}

.login-box input:focus {
    border-color: var(--accent);
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.2);
}

/* Bottoni Generali e Login */
button {
    width: 100%;
    padding: 18px;
    margin-top: 14px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-family: 'Poppins', sans-serif;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

/* Bottone Login (Primario) */
button[onclick="login()"] {
    background: var(--accent);
    color: #0a0a0a;
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
    border: none;
}

button[onclick="login()"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.3);
    filter: brightness(0.9);
}

/* Bottone Registrati (Secondario) */
button[onclick="register()"] {
    background: rgba(255, 255, 255, 0.05);
    color: white;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

button[onclick="register()"]:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

button:active {
    transform: scale(0.98);
}

/* Placeholder color */
::placeholder {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.95rem;
}

/* --- CLASSE LOGOUT (IL PICCOLINO) --- */
.button-logout {
    width: auto;
    padding: 10px 18px;
    font-size: 13px;
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
    border: 1px solid rgba(220, 53, 69, 0.2);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    margin: 0;
}

.button-logout:hover {
    background: #dc3545;
    color: white;
    transform: scale(0.95);
}

/* --- OTTIMIZZAZIONI MOBILE TOTALE --- */
@media (max-width: 768px) {
    body, .chat-window, .chat-header, #chat-container, .msg-bubble, #user-input, button, .login-box input, .login-box h2 {
        font-size: 0.85rem; /* Tutto più piccolo e uniforme */
    }

    .chat-window {
        border-radius: 0;
        margin: 0;
    }

    .chat-header {
        padding: 18px 16px;
    }

    #chat-container {
        padding: 16px;
        gap: 16px;
    }

    .msg-bubble {
        max-width: 90%;
        padding: 12px 16px;
        line-height: 1.4;
    }

    .chat-input-area {
        padding: 14px 16px;
        gap: 8px;
    }

    #user-input {
        padding: 12px 16px;
        font-size: 0.85rem;
        border-radius: 12px;
    }

    /* Bottone invio rettangolare */
    #send-btn {
        width: auto;
        height: 40px;
        padding: 0 20px;
        border-radius: 12px;
        font-size: 0.85rem;
        background: var(--accent);
        color: #0a0a0a;
        box-shadow: 0 3px 12px rgba(255, 255, 255, 0.2);
    }

    #send-btn:hover {
        transform: translateY(-1px);
        box-shadow: 0 5px 15px rgba(255, 255, 255, 0.3);
    }

    #send-btn:active {
        transform: scale(0.95);
    }

    /* LOGIN MOBILE */
    .login-box {
        padding: 30px 20px;
        border-radius: 20px;
        max-width: 95%;
    }

    .login-box h2 {
        font-size: 1.2rem;
        margin-bottom: 25px;
    }

    .login-box input {
        padding: 12px 16px;
        margin-bottom: 12px;
    }

    button {
        padding: 12px;
        font-size: 0.85rem;
    }

    .button-logout {
        font-size: 10px;
        padding: 6px 12px;
    }
}

/* Piccoli schermi 480px */
@media (max-width: 480px) {
    #chat-container {
        padding: 14px;
        gap: 12px;
    }

    .msg-bubble {
        max-width: 95%;
        padding: 10px 14px;
    }

    #user-input {
        padding: 10px 14px;
        font-size: 0.8rem;
    }

    #send-btn {
        height: 36px;
        padding: 0 16px;
        font-size: 0.8rem;
    }

    .login-box {
        padding: 25px 16px;
        border-radius: 18px;
    }

    .login-box h2 {
        font-size: 1rem;
        margin-bottom: 20px;
    }

    .login-box input {
        padding: 10px 14px;
        font-size: 0.8rem;
    }

    button {
        padding: 10px;
        font-size: 0.8rem;
    }

    .button-logout {
        font-size: 9px;
        padding: 5px 10px;
    }
}