:root {
    --color-bg-default: #f6f8fa;
    --color-fg-default: #24292e;
    --color-border-default: #d1d5da;
    --color-header-bg: #24292e;
    --color-header-fg: #ffffff;
    --color-btn-primary-bg: #2ea44f;
    --color-btn-primary-fg: #ffffff;
    --color-btn-primary-hover-bg: #2c974b;
    --color-btn-danger-bg: #d73a49;
    --color-btn-danger-fg: #ffffff;
    --color-btn-danger-hover-bg: #cb2431;
    --color-link-default: #0366d6;
    --color-card-bg: #ffffff;
    --color-tab-border-selected: #f9826c;
}

body.dark-mode {
    --color-bg-default: #0d1117;
    --color-fg-default: #c9d1d9;
    --color-border-default: #30363d;
    --color-header-bg: #161b22;
    --color-header-fg: #c9d1d9;
    --color-btn-primary-bg: #238636;
    --color-btn-primary-fg: #ffffff;
    --color-btn-primary-hover-bg: #2ea043;
    --color-btn-danger-bg: #da3633;
    --color-btn-danger-fg: #ffffff;
    --color-btn-danger-hover-bg: #f85149;
    --color-link-default: #58a6ff;
    --color-card-bg: #161b22;
    --color-tab-border-selected: #f9826c;
}

body {
    background-color: var(--color-bg-default);
    color: var(--color-fg-default);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    font-size: 14px;
    line-height: 1.5;
    transition: background-color 0.2s, color 0.2s;
}

.navbar {
    background-color: var(--color-header-bg) !important;
    color: var(--color-header-fg);
    border-bottom: 1px solid var(--color-border-default);
    padding: .5rem 1rem;
}

.navbar-brand {
    color: var(--color-header-fg) !important;
    font-weight: 600;
}

.navbar-brand img {
    filter: invert(1);
    height: 32px;
}

body.dark-mode .navbar-brand img {
    filter: none;
}

#user-info {
    color: var(--color-header-fg);
    font-weight: 600;
}

#logout-btn {
    background-color: transparent;
    border: 1px solid var(--color-border-default);
    color: var(--color-header-fg);
}

#logout-btn:hover {
    background-color: var(--color-btn-danger-bg);
    border-color: var(--color-btn-danger-bg);
}

#theme-toggler {
    color: var(--color-header-fg);
    border: 1px solid var(--color-border-default);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
}

.card-header {
    background-color: var(--color-card-bg);
    border-bottom: 1px solid var(--color-border-default);
}

.nav-tabs {
    border-bottom: 1px solid var(--color-border-default);
}

.nav-tabs .nav-link {
    border: none;
    color: var(--color-fg-default);
    padding: 8px 16px;
    border-bottom: 2px solid transparent;
}

.nav-tabs .nav-link.active {
    color: var(--color-fg-default);
    background-color: transparent;
    border-bottom: 2px solid var(--color-tab-border-selected);
    font-weight: 600;
}

.nav-tabs .nav-link:hover {
    color: var(--color-fg-default);
    border-bottom-color: var(--color-border-default);
}

.btn {
    border-radius: 6px;
    font-weight: 600;
    padding: 5px 16px;
    font-size: 14px;
    line-height: 20px;
    transition: background-color .2s;
}

.btn-primary {
    background-color: var(--color-btn-primary-bg);
    color: var(--color-btn-primary-fg);
    border: 1px solid rgba(27, 31, 35, 0.15);
}

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

.btn-danger {
    background-color: var(--color-btn-danger-bg);
    color: var(--color-btn-danger-fg);
    border: 1px solid rgba(27, 31, 35, 0.15);
}

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

.form-control, .form-select {
    background-color: var(--color-card-bg);
    color: var(--color-fg-default);
    border: 1px solid var(--color-border-default);
    border-radius: 6px;
}

.form-control:focus, .form-select:focus {
    border-color: var(--color-link-default);
    box-shadow: 0 0 0 3px rgba(3, 102, 214, 0.3);
}

.list-group-item {
    background-color: transparent;
    border-color: var(--color-border-default);
    color: var(--color-fg-default);
}

a {
    color: var(--color-link-default);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}