:root {
    /* Solarized Dark Palette */
    --base03:    #002b36; /* background */
    --base02:    #073642; /* background highlights */
    --base01:    #586e75; /* comments / secondary content */
    --base00:    #657b83;
    --base0:     #fefdf1; /* body text */
    --base1:     #93a1a1; /* emphasized content */
    --base2:     #eee8d5;
    --base3:     #fdf6e3;
    --yellow:    #b58900;
    --orange:    #cb4b16;
    --red:       #dc322f;
    --magenta:   #d33682;
    --violet:    #6c71c4;
    --blue:      #268bd2;
    --cyan:      #2aa198;
    --green:     #859900;

    /* Semantic Mappings */
    --bg-main: var(--base03);
    --bg-card: var(--base02);
    --bg-hover: rgba(42, 161, 152, 0.1);
    --text-main: var(--base0);
    --text-muted: var(--base01);
    --text-heading: var(--base1);
    --primary: var(--cyan);
    --primary-hover: #21837b;
    --danger: var(--red);
    --success: var(--green);
    --warning: var(--yellow);
    --border: var(--base01);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    font-size: 14px;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-heading);
    font-weight: 600;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--base1);
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: rgba(7, 54, 66, 0.5); /* slightly transparent base02 */
    backdrop-filter: blur(10px);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
    color: var(--primary);
    font-size: 1.25rem;
    letter-spacing: 1px;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 0;
}

.nav-item {
    display: block;
    padding: 12px 20px;
    color: var(--text-main);
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

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

.nav-item.active {
    background-color: var(--bg-hover);
    color: var(--primary);
    border-left-color: var(--primary);
}

.nav-item i {
    width: 20px;
    margin-right: 10px;
    text-align: center;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
}

.text-danger {
    color: var(--danger) !important;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    background-color: var(--bg-main);
    border-bottom: 1px solid var(--border);
}

.header-title h1 {
    font-size: 1.5rem;
}

.header-user {
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.content-area {
    padding: 30px;
    flex: 1;
    overflow-y: auto;
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border);
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.card-header {
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-title {
    font-size: 1.1rem;
    color: var(--text-heading);
}

/* Inputs & Buttons */
.form-control {
    width: 100%;
    padding: 10px 15px;
    background-color: var(--bg-main);
    border: 1px solid var(--border);
    color: var(--text-heading);
    border-radius: 4px;
    outline: none;
    transition: border-color 0.2s;
    margin-bottom: 15px;
}

.form-control:focus {
    border-color: var(--primary);
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--primary);
    color: var(--bg-main);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    text-align: center;
}

.btn:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--border);
    color: var(--text-heading);
}
.btn-secondary:hover {
    background-color: var(--text-muted);
}

.btn-danger {
    background-color: var(--danger);
    color: white;
}
.btn-danger:hover {
    background-color: #b52927;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th, .table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    color: var(--text-heading);
    font-weight: 500;
}

.table tbody tr:hover {
    background-color: rgba(7, 54, 66, 0.8);
}

/* Small buttons */
.btn-sm {
    padding: 6px 10px;
    font-size: 12px;
}

/* Alerts */
.alert {
    padding: 12px 18px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success {
    background: rgba(133, 153, 0, 0.15);
    border: 1px solid var(--green);
    color: var(--green);
}

.alert-danger {
    background: rgba(220, 50, 47, 0.15);
    border: 1px solid var(--red);
    color: var(--red);
}

/* Text helper */
.text-primary {
    color: var(--primary);
}