/* 1. VARIABILI CROMATICHE FISSE */
:root {
    --bg-color: #0a0a0a;
    --sidebar-color: #121212;
    --text-color: #e5e5e5;
    --border-color: #222222;
    --active-bg: #2a2a2a;
    --hover-bg: #1e1e1e;
}

:root[data-theme="light"] {
    --bg-color: #ffffff;
    --sidebar-color: #fbfbfb;
    --text-color: #1a1a1a;
    --border-color: #ebebeb;
    --active-bg: #e5e5e5;
    --hover-bg: #f0f0f0;
}

/* 2. ANTI-FLASH: Blocca i movimenti bruschi all'avvio */
.preload * {
    transition: none !important;
}

/* 3. IL SEGRETO DELLA SMOOTHNESS: Transizione globale fluida */
* { 
    box-sizing: border-box; 
    margin: 0; 
    padding: 0; 
    transition: background-color 0.6s cubic-bezier(0.4, 0, 0.2, 1), 
                color 0.6s ease, 
                border-color 0.6s ease;
}

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

/* Layout Struttura */
.main-header {
    height: 54px;
    background-color: var(--sidebar-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-color);
    z-index: 200;
}

.logo { 
    font-weight: 600; 
    letter-spacing: 0.5px; 
    font-size: 0.9rem; 
    text-transform: uppercase; 
}

.btn-theme { 
    background: transparent; 
    border: none; 
    color: var(--text-color); 
    cursor: pointer; 
    opacity: 0.8; 
}
.btn-theme:hover { opacity: 1; }

.main-container { display: flex; flex: 1; overflow: hidden; }

.sidebar {
    width: 64px;
    background-color: var(--sidebar-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: visible; 
    z-index: 100;
}

#view-buttons { width: 100%; display: flex; flex-direction: column; }

/* Wrapper e Pulsanti Principali */
.menu-wrapper {
    position: relative;
    width: 100%;
}

.btn-view {
    width: 100%;
    height: 45px;
    border: none;
    border-bottom: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Stile Sottomenu (Tendina) */
.sub-menu {
    position: absolute;
    left: 64px;
    top: 0;
    width: 160px;
    background-color: var(--sidebar-color);
    border: 1px solid var(--border-color);
    border-left: none;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, background-color 0.6s ease;
    box-shadow: 4px 4px 15px rgba(0,0,0,0.05);
}

.menu-wrapper:hover .sub-menu {
    opacity: 1;
    visibility: visible;
}

.btn-sub {
    height: 45px;
    border: none;
    background: transparent;
    color: var(--text-color);
    text-align: left;
    padding-left: 20px;
    font-size: 0.85rem;
    cursor: pointer;
}

.btn-view:hover, .btn-sub:hover { background-color: var(--hover-bg); }
.btn-view.active, .btn-sub.active { background-color: var(--active-bg); font-weight: 600; }

/* Contenuto dell'Iframe */
.content { flex: 1; background-color: var(--bg-color); }
#view-frame { width: 100%; height: 100%; border: none; display: block; }


/* --- AGGIUNTE PER L'AUTENTICAZIONE --- */

/* Allineamento tasti Header */
.header-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* Modale (Finestra a comparsa) */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* Classe per nascondere la modale */
.modal-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.modal-content {
    background-color: var(--sidebar-color);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 16px;
    text-align: center;
    width: 90%;
    max-width: 350px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal-overlay.hidden .modal-content {
    transform: translateY(20px);
}

.modal-content h3 { margin-top: 0; margin-bottom: 10px; font-weight: 500;}
.modal-content p { font-size: 0.9rem; opacity: 0.7; margin-bottom: 20px;}

.modal-content input {
    width: 100%;
    padding: 12px;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-color);
    border-radius: 8px;
    margin-bottom: 20px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.3s ease;
}
.modal-content input:focus { border-color: gray; }

.modal-buttons {
    display: flex;
    gap: 10px;
}

.modal-buttons button {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

.btn-cancel {
    background-color: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color) !important;
}
.btn-cancel:hover { background-color: var(--hover-bg); }

.btn-confirm {
    background-color: var(--text-color);
    color: var(--bg-color);
}
.btn-confirm:hover { opacity: 0.9; }