:root {
    /* Brand Colors based on ALAC SYSTEM Logo */
    --brand-black: #111111;
    --brand-gold: #FFC107;
    /* The yellow/gold from the logo */
    --brand-gold-hover: #FFB300;

    /* Functional Colors */
    --primary-color: var(--brand-black);
    --secondary-color: var(--brand-gold);
    --bg-color: #F3F4F6;
    --surface-color: #FFFFFF;

    /* Text Colors */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-on-primary: #FFFFFF;
    --text-on-brand: #111111;
    /* Black text on gold background for contrast */

    /* Borders */
    --border-color: #E5E7EB;

    /* Typography */
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Layout */
    --sidebar-width: 260px;
    --header-height: 70px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--brand-black);
    color: var(--text-on-primary);
    position: fixed;
    height: 100%;
    z-index: 50;
    display: flex;
    flex-direction: column;
    transition: width 0.3s ease;
}

.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- Sidebar Components --- */
.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: white;
}

.logo-icon-box {
    width: 36px;
    height: 36px;
    background-color: var(--brand-gold);
    color: var(--brand-black);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    border-radius: var(--radius-sm);
    letter-spacing: -1px;
}

.logo-text {
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.sidebar-nav {
    padding: 1.5rem 1rem;
    flex: 1;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: #9CA3AF;
    text-decoration: none;
    border-radius: var(--radius-md);
    margin-bottom: 0.25rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: white;
}

.nav-link.active {
    background-color: var(--brand-gold);
    color: var(--brand-black);
    font-weight: 600;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background-color: rgba(0, 0, 0, 0.2);
}

/* --- Header --- */
.header {
    height: var(--header-height);
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    position: sticky;
    top: 0;
    z-index: 40;
}

/* --- Content --- */
.content-area {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* --- Cards --- */
.card {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
}

/* --- Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--brand-gold);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--brand-black);
    line-height: 1.2;
    margin: 0.5rem 0;
}

.stat-label {
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    font-weight: 600;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--brand-gold);
    color: var(--text-on-brand);
}

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

/* --- Forms --- */
.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s;
    background-color: #F9FAFB;
}

.form-input:focus {
    outline: none;
    border-color: var(--brand-gold);
    background-color: white;
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.2);
}

/* --- Login Page Specific --- */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--brand-black);
    /* Dark background for login */
    padding: 1rem;
}

.login-card {
    background: white;
    padding: 3rem;
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-lg);
    border-top: 6px solid var(--brand-gold);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-logo {
    font-size: 2rem;
    font-weight: 800;
    color: var(--brand-black);
    display: inline-block;
    margin-bottom: 0.5rem;
    text-decoration: none;
}