:root {
    --bg-color: #0B1120;
    --card-bg: #1E293B;
    --border-color: #334155;
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --primary: #0EA5E9;
    --primary-hover: #0284C7;
    --danger: #EF4444;
    --input-bg: #0F172A;
    --input-border: #334155;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 40px 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 30px;
    position: relative;
}

.logout-btn {
    position: absolute;
    right: 0;
    top: 0;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
}

.logout-btn:hover {
    color: var(--text-main);
    border-color: var(--primary);
}

.logo-img {
    max-height: 60px;
    margin-bottom: 10px;
}

/* Tab Navigation Styling */
.tab-nav {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    justify-content: center;
}

.tab-btn {
    background: transparent;
    border: 2px solid var(--border-color);
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
}

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

.tab-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 24px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-main);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.mt-1 { margin-top: 20px; }

.input-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 600;
}

input, select, textarea {
    width: 100%;
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 0.95rem;
    outline: none;
    transition: all 0.2s ease;
}

input:focus, select:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

.item-row {
    margin-bottom: 12px;
    display: flex;
    gap: 12px;
}

.grid-custom {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 45px;
}

.grid-opt-custom {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr 45px;
}

.btn {
    cursor: pointer;
    font-weight: 600;
    border-radius: 8px;
    padding: 12px 20px;
    border: none;
    transition: all 0.2s;
}

.btn-outline {
    background: transparent;
    border: 2px dashed var(--input-border);
    color: var(--text-muted);
    width: 100%;
    margin-top: 15px;
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    background-color: rgba(14, 165, 233, 0.05);
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-large {
    width: 100%;
    padding: 16px;
    font-size: 1.1rem;
    margin-top: 20px;
}

.btn-delete {
    background-color: var(--input-bg);
    color: var(--danger);
    border: 1px solid var(--input-border);
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
}

.btn-delete:hover {
    background-color: var(--danger);
    color: white;
    border-color: var(--danger);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
    padding: 10px 0;
}

.checkbox-group input {
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
    cursor: pointer;
}

.checkbox-group label {
    cursor: pointer;
    font-weight: 500;
}

/* Login specific styles */
.login-container {
    max-width: 400px;
    margin: 10vh auto;
    text-align: center;
}

.error-msg {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}