/* 
   Adobe Spectrum Dark Theme Base
   These variables will power the entire explorer interface later
*/
:root {
    /* Backgrounds */
    --spectrum-bg-page: #1D1D1D; /* Deepest background */
    --spectrum-bg-card: #2B2B2B; /* Slightly raised surfaces */
    --spectrum-bg-input: #141414; /* Inset fields */
    
    /* Text */
    --spectrum-text-main: #F3F3F3;
    --spectrum-text-muted: #B3B3B3;
    
    /* Accents */
    --spectrum-accent-blue: #0265DC;
    --spectrum-accent-blue-hover: #0054B6;
    --spectrum-error: #E34850;
    
    /* Borders & Shadows */
    --spectrum-border: #3E3E3E;
    --shadow-soft: 0 4px 16px rgba(0, 0, 0, 0.4);
    
    /* Radii (8px to 12px per blueprint) */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

/* Global Reset */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body.login-body {
    background-color: var(--spectrum-bg-page);
    color: var(--spectrum-text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

/* --- Login Gate Card --- */
.login-card {
    background-color: var(--spectrum-bg-card);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--spectrum-border);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-card h1 {
    font-size: 24px;
    margin-bottom: 8px;
}

.login-card p {
    color: var(--spectrum-text-muted);
    font-size: 14px;
    margin-bottom: 24px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.login-form input {
    background-color: var(--spectrum-bg-input);
    border: 1px solid var(--spectrum-border);
    color: var(--spectrum-text-main);
    padding: 12px;
    border-radius: var(--radius-md);
    font-size: 24px;
    text-align: center;
    letter-spacing: 8px;
    outline: none;
    transition: border-color 0.2s ease;
}

.login-form input:focus {
    border-color: var(--spectrum-accent-blue);
}

.login-form button {
    background-color: var(--spectrum-accent-blue);
    color: white;
    border: none;
    padding: 14px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.login-form button:hover {
    background-color: var(--spectrum-accent-blue-hover);
}

.error-banner {
    background-color: rgba(227, 72, 80, 0.1);
    color: var(--spectrum-error);
    border: 1px solid var(--spectrum-error);
    padding: 10px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 14px;
}

/* --- Explorer App Layout --- */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    background-color: var(--spectrum-bg-page);
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--spectrum-bg-page);
    border-right: 1px solid var(--spectrum-border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 24px 20px;
    font-weight: bold;
    font-size: 18px;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--spectrum-border);
}

.sidebar-nav {
    padding: 16px 12px;
    overflow-y: auto;
    flex-grow: 1;
}

.nav-category {
    font-size: 12px;
    text-transform: uppercase;
    color: var(--spectrum-text-muted);
    margin: 16px 0 8px 8px;
    letter-spacing: 1px;
}

.nav-item {
    display: block;
    padding: 10px 12px;
    color: var(--spectrum-text-main);
    text-decoration: none;
    border-radius: var(--radius-md);
    margin-bottom: 4px;
    font-size: 14px;
    transition: background-color 0.2s ease;
}

.nav-item:hover {
    background-color: var(--spectrum-bg-card);
}

.nav-item.active {
    background-color: rgba(2, 101, 220, 0.15); /* Soft blue tint */
    color: var(--spectrum-accent-blue);
    font-weight: 600;
}

/* Main View */
.main-view {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--spectrum-bg-card);
}

.top-bar {
    height: 70px;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--spectrum-border);
}

.breadcrumbs {
    font-size: 16px;
    font-weight: 500;
}

.top-bar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.vt-badge {
    background-color: rgba(46, 204, 113, 0.15);
    color: #2ecc71;
    border: 1px solid #2ecc71;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-logout {
    color: var(--spectrum-text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.btn-logout:hover {
    color: var(--spectrum-error);
}

/* File Grid */
.file-area {
    padding: 24px;
    overflow-y: auto;
    flex-grow: 1;
}

.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
}

.file-card {
    background-color: var(--spectrum-bg-page);
    border: 1px solid var(--spectrum-border);
    border-radius: var(--radius-lg);
    padding: 16px;
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.file-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
    border-color: var(--spectrum-accent-blue);
}

.file-icon {
    width: 64px;
    height: 64px;
    background-color: var(--spectrum-bg-input);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    color: var(--spectrum-accent-blue);
}

.file-name {
    font-size: 14px;
    color: var(--spectrum-text-main);
    word-break: break-all;
    margin-bottom: 12px;
    flex-grow: 1;
}

.btn-download {
    background-color: var(--spectrum-accent-blue);
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 600;
    width: 100%;
    transition: background 0.2s;
}

.btn-download:hover {
    background-color: var(--spectrum-accent-blue-hover);
}

.empty-state {
    text-align: center;
    color: var(--spectrum-text-muted);
    margin-top: 40px;
}