:root {
    --bg-color: #F4F6FA;         /* Cool light grey/blue main background */
    --sidebar-bg: #0F2130;       /* Dark navy-blue sidebar matching EaseCert */
    --panel-bg: #FFFFFF;         /* White card panels */
    --border-color: #E4E7EC;     /* Light grey borders */
    
    --primary: #102E4E;          /* Deep navy brand */
    --primary-hover: #1A3F66;
    --accent: #FFA726;           /* Warm golden-orange active state */
    --accent-hover: #FB8C00;
    --danger: #EF4444;
    --success: #10B981;
    
    --text-main: #1F2937;        /* Dark grey text */
    --text-muted: #64748B;       /* Slate grey secondary text */
    --text-on-dark: #FFFFFF;     /* Sidebar text */
    --text-muted-dark: #9EAEBE;  /* Sidebar secondary text */
    
    --shadow: 0 4px 18px 0 rgba(0, 0, 0, 0.03), 0 2px 6px 0 rgba(0, 0, 0, 0.01);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* App Container */
.app-container {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

/* Sidebar Navigation */
.sidebar {
    width: 270px;
    background-color: var(--sidebar-bg);
    color: var(--text-on-dark);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    padding: 1.5rem 1.1rem;
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    z-index: 100;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2.25rem;
    padding: 0 0.5rem;
    overflow: hidden;
}

.logo-icon {
    width: 2.5rem;
    height: 2.5rem;
    background: #FFFFFF;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border: 2px solid var(--accent);
    flex-shrink: 0;
}

.logo-text {
    font-size: 1.35rem;
    font-weight: 800;
    color: #FFFFFF;
    display: flex;
    flex-direction: column;
    line-height: 1.1;
    letter-spacing: -0.025em;
    transition: opacity 0.2s ease;
}

.logo-subtitle {
    font-size: 0.62rem;
    color: var(--text-muted-dark);
    letter-spacing: 0.08em;
    font-weight: 600;
    text-transform: uppercase;
    margin-top: 2px;
}

/* Tabs list */
.tabs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex-grow: 1;
}

.tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted-dark);
    padding: 0.85rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 9999px; /* Rounded pill style matching EaseCert */
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    width: 100%;
    text-decoration: none;
    outline: none;
}

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

.tab-btn.active {
    color: #000000;
    background: var(--accent); /* Golden-orange active tab background */
    font-weight: 700;
    box-shadow: 0 4px 12px rgba(255, 167, 38, 0.25);
}

.tab-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 1.25rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.secure-session {
    font-size: 0.75rem;
    color: var(--text-muted-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    font-weight: 600;
    letter-spacing: 0.03em;
}

/* Collapsed Sidebar State */
.app-container.sidebar-collapsed .sidebar {
    width: 80px;
    padding: 1.5rem 0.75rem;
}

.app-container.sidebar-collapsed .logo-text,
.app-container.sidebar-collapsed .tab-btn span:not(.tab-icon),
.app-container.sidebar-collapsed .sidebar-footer {
    display: none;
}

.app-container.sidebar-collapsed .tab-btn {
    justify-content: center;
    padding: 0.85rem;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    margin: 0 auto;
}

/* Main Layout content */
.main-layout {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color);
    min-width: 0;
    height: 100vh;
    overflow-y: auto;
}

/* Top Navbar */
.top-navbar {
    height: 75px;
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 90;
    flex-shrink: 0;
}

.navbar-title-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-toggle-btn {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--accent);
    color: #FFFFFF;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: bold;
    box-shadow: 0 2px 6px rgba(255, 167, 38, 0.3);
    transition: transform 0.3s ease;
    outline: none;
}

.app-container.sidebar-collapsed .sidebar-toggle-btn {
    transform: rotate(180deg);
}

.navbar-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: -0.02em;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.navbar-date-box {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-align: right;
    display: flex;
    flex-direction: column;
    line-height: 1.35;
    font-weight: 500;
}

.navbar-date {
    font-weight: 800;
    color: var(--primary);
}

.navbar-bell {
    font-size: 1.2rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.navbar-user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding-left: 1.25rem;
    border-left: 1px solid var(--border-color);
}

.avatar-circle {
    width: 2.35rem;
    height: 2.35rem;
    border-radius: 50%;
    background-color: #52B155; /* Green profile background matching EaseCert */
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.user-text-info {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.profile-name {
    font-size: 0.82rem;
    font-weight: 800;
    color: var(--primary);
}

.profile-role {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
}

.logout-nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 0.35rem 0.6rem;
    border-radius: 0.35rem;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 700;
    transition: all 0.2s ease;
}

.logout-nav-btn:hover {
    background: #FFF5F5;
    border-color: #FCA5A5;
    color: var(--danger);
}

/* Scrollable main view */
.main-content {
    padding: 2rem;
    max-width: 1300px;
    width: 100%;
    margin: 0 auto;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 1.75rem;
}

/* Decorative Section Header Line matching EaseCert */
.section-header {
    font-size: 0.92rem;
    font-weight: 800;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 1.1rem;
    margin-top: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header::before {
    content: '';
    display: inline-block;
    width: 3px;
    height: 14px;
    background-color: var(--accent); /* Orange vertical bar */
    border-radius: 2px;
}

.section-header.blue::before {
    background-color: var(--primary); /* Blue vertical bar */
}

/* Panels styling */
.panel {
    display: none;
}

.panel.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

/* White Card Containers */
.white-card {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.75rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

/* Metric Cards Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

.stat-card-accent {
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 5px;
    border-top-left-radius: 12px;
    border-bottom-left-radius: 12px;
}

.stat-card-accent.blue { background-color: var(--primary); }
.stat-card-accent.orange { background-color: var(--accent); }

.stat-card-details {
    display: flex;
    flex-direction: column-reverse; /* Labels below numbers */
    gap: 0.25rem;
    padding-left: 0.5rem;
}

.stat-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 700;
}

.stat-value {
    font-size: 2.35rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.1;
}

.stat-icon-box {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    flex-shrink: 0;
}

/* Card Icon Box Backgrounds */
.stat-card.blue-accent-box .stat-icon-box {
    background: rgba(16, 46, 78, 0.06);
    color: var(--primary);
}

.stat-card.orange-accent-box .stat-icon-box {
    background: rgba(255, 167, 38, 0.1);
    color: var(--accent);
}

/* Forms controls */
.form-group {
    margin-bottom: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.82rem;
    font-weight: 800;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

input[type="text"], input[type="password"], select {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.8rem 1rem;
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    outline: none;
}

input[type="text"]:focus, input[type="password"]:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(16, 46, 78, 0.12);
}

.upload-zone {
    border: 2px dashed #CBD5E1;
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #F8FAFC;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(16, 46, 78, 0.02);
}

.upload-icon {
    font-size: 2.5rem;
    color: var(--primary);
    transition: transform 0.2s ease;
}

.upload-zone:hover .upload-icon {
    transform: translateY(-4px);
}

.upload-zone input[type="file"] {
    display: none;
}

.btn {
    background: var(--primary);
    color: white;
    font-weight: 700;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 0.92rem;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    box-shadow: 0 2px 4px rgba(16, 46, 78, 0.1);
}

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(16, 46, 78, 0.15);
}

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

.btn-danger {
    background: var(--danger);
    box-shadow: 0 2px 4px rgba(239, 68, 68, 0.1);
}

.btn-danger:hover {
    background: #DC2626;
    box-shadow: 0 4px 8px rgba(239, 68, 68, 0.15);
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin-top: 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #FFFFFF;
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    font-size: 0.92rem;
}

th, td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: #F8FAFC;
    color: var(--text-muted);
    font-weight: 800;
    text-transform: uppercase;
    font-size: 0.78rem;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--border-color);
}

td {
    color: var(--text-main);
    font-weight: 600;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background: #F8FAFC;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.badge-project {
    background: rgba(16, 46, 78, 0.06);
    color: var(--primary);
    border: 1px solid rgba(16, 46, 78, 0.12);
}

/* Chat Playground */
.chat-layout {
    display: flex;
    flex-direction: column;
    height: 520px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #FFFFFF;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.chat-header {
    padding: 1rem 1.25rem;
    background: #F8FAFC;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-messages {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: #F8FAFC;
}

.message-bubble {
    max-width: 75%;
    padding: 0.85rem 1.25rem;
    border-radius: 12px;
    line-height: 1.5;
    font-size: 0.95rem;
}

.message-user {
    background: var(--primary);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 2px;
    box-shadow: 0 2px 6px rgba(16, 46, 78, 0.12);
}

.message-ai {
    background: #FFFFFF;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    align-self: flex-start;
    border-bottom-left-radius: 2px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
}

.chat-input-area {
    padding: 1.25rem;
    background: #FFFFFF;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.75rem;
}

.chat-input-area input {
    flex-grow: 1;
}

/* Toast System */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--success);
    color: white;
    padding: 1.1rem 1.75rem;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
    font-weight: 700;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-error {
    background: var(--danger);
}

/* Spinner Anim */
.spinner {
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top: 3px solid white;
    border-radius: 50%;
    width: 1.25rem;
    height: 1.25rem;
    animation: spin 1s linear infinite;
    display: inline-block;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive sidebar layouts */
@media (max-width: 900px) {
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        padding: 1.25rem;
    }
    
    .logo-area {
        margin-bottom: 1.25rem;
    }
    
    .tabs {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.35rem;
    }
    
    .tab-btn {
        width: auto;
        padding: 0.65rem 1rem;
        font-size: 0.85rem;
        border-radius: 8px;
    }
    
    .sidebar-footer {
        display: none;
    }
    
    .main-layout {
        height: auto;
    }
}

/* Code Tabs Switcher */
.code-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
}
.code-tab-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    font-weight: 700;
    cursor: pointer;
    font-size: 0.88rem;
    border-radius: 6px;
    transition: all 0.2s ease;
    outline: none;
}
.code-tab-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--primary);
}
.code-tab-btn.active {
    background: var(--primary);
    color: #FFFFFF;
    box-shadow: 0 2px 6px rgba(16, 46, 78, 0.15);
}
.code-block-wrapper {
    display: none;
    animation: fadeIn 0.3s ease;
}
.code-block-wrapper.active {
    display: block;
}