:root {
    /* Shared Core Tokens */
    --bg: #0a0a0a;
    --surface: #141414;
    --surface2: #1c1c1c;
    --card: #161616;
    --input: #1a1a1a;
    --border: rgba(255, 255, 255, 0.08);
    
    --text: #e8e8e8;
    --muted: #8a94a6;
    --muted2: #555555;
    
    --accent: #e53935;
    --accent-dark: #c62828;
    --gradient: linear-gradient(135deg, #c62828, #e53935);
    
    --green: #4caf50;
    --orange: #f59e0b;
    --red: #ef4444;
    --blue: #3b82f6;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

/* Shell Header */
.shell-header {
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 14px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.shell-logo {
    font-size: 16px;
    font-weight: 800;
    letter-spacing: 1px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--accent);
}

.shell-logo span {
    color: var(--text);
}

.shell-user-info {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 13px;
    color: var(--muted);
}

.shell-btn-logout {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 7px 14px;
    border-radius: 7px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    transition: 0.2s;
}

.shell-btn-logout:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Shell Main container */
.shell-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 24px;
}

.shell-page-title {
    font-size: 26px;
    font-weight: 800;
    margin-bottom: 6px;
}

.shell-page-sub {
    color: var(--muted);
    font-size: 14px;
    margin-bottom: 24px;
}

/* Shell Tabs */
.shell-tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 28px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 4px;
    overflow-x: auto;
}

.shell-tab-btn {
    flex: 1;
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    border-radius: 7px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    transition: 0.2s;
    text-align: center;
    min-width: 100px;
}

.shell-tab-btn:hover {
    color: var(--text);
}

.shell-tab-btn.active {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 4px 12px rgba(229, 57, 53, 0.2);
}

/* Common Card Styles */
.shell-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px;
    margin-bottom: 20px;
}

.shell-card-title {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}