/* =============================================
   GLOBAL.CSS - Design System & Utilities
   ============================================= */

:root { 
    --primary-color: #2563eb; 
    --primary-dark: #1d4ed8;
    --secondary-color: #475569; 
    --success-color: #22c55e; 
    --danger-color: #ef4444; 
    --warning-color: #f59e0b;
    --bg-color: #f8fafc; 
    --bg-white: #ffffff;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 15px rgba(0,0,0,0.1);
    --radius: 8px;
    --font-main: 'Inter', Arial, sans-serif; 
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { 
    font-family: var(--font-main); 
    background: var(--bg-color); 
    color: var(--text-main);
    line-height: 1.6;
}

/* =============================================
   FLOAT LAYOUT SYSTEM
   ============================================= */
.clearfix::after {
    content: "";
    display: table;
    clear: both;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.row { margin: 0 -10px; }
.row::after { content: ""; display: table; clear: both; }

.col { float: left; padding: 0 10px; }
.col-1 { width: 8.33%; }
.col-2 { width: 16.66%; }
.col-3 { width: 25%; }
.col-4 { width: 33.33%; }
.col-6 { width: 50%; }
.col-8 { width: 66.66%; }
.col-9 { width: 75%; }
.col-12 { width: 100%; }

/* =============================================
   NAVIGATION
   ============================================= */
.main-nav {
    background: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.nav-container::after { content: ""; display: table; clear: both; }
.nav-logo {
    float: left;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}
.nav-links {
    float: right;
}
.nav-links a, .nav-links span {
    display: inline-block;
    margin-left: 20px;
    color: var(--text-main);
    text-decoration: none;
    font-weight: 500;
}
.nav-links a:hover { color: var(--primary-color); }
.nav-user { color: var(--text-muted) !important; }

/* =============================================
   BUTTONS
   ============================================= */
.btn {
    display: inline-block;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: background 0.2s, transform 0.1s;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
    background: var(--primary-color);
    color: white;
}
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary {
    background: var(--secondary-color);
    color: white;
}
.btn-success {
    background: var(--success-color);
    color: white;
}
.btn-danger {
    background: var(--danger-color);
    color: white;
}
.btn-outline {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}
.btn-nav {
    padding: 8px 16px;
    border-radius: var(--radius);
    background: var(--bg-color);
}
.btn-nav.btn-primary {
    background: var(--primary-color);
    color: white !important;
}

/* =============================================
   CARDS
   ============================================= */
.card {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
    margin-bottom: 20px;
}
.card-header {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 15px;
}
.card-title {
    font-size: 1.25rem;
    font-weight: 600;
}

/* =============================================
   FORMS
   ============================================= */
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--text-main);
}
.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
.form-control:valid { border-color: var(--success-color); }
.form-control:invalid:not(:placeholder-shown) { border-color: var(--danger-color); }

/* Error Message (hidden by default, shown after invalid input) */
.error-msg {
    display: none;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 5px;
}
.form-control:invalid:not(:placeholder-shown) + .error-msg {
    display: block;
}

/* =============================================
   TABLES
   ============================================= */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}
.table th, .table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.table th {
    background: var(--bg-color);
    font-weight: 600;
}
.table tbody tr:hover {
    background: var(--bg-color);
}

/* =============================================
   STAT CARDS
   ============================================= */
.stat-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 25px;
    text-align: center;
}
.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}
.stat-label {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 5px;
}

/* =============================================
   PROGRESS BAR
   ============================================= */
.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--success-color);
    transition: width 0.3s;
}

/* =============================================
   ALERTS
   ============================================= */
.alert {
    padding: 15px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
}
.alert-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
}
.alert-danger {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}
.alert-warning {
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

/* =============================================
   UTILITIES
   ============================================= */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }

.mt-1 { margin-top: 10px; }
.mt-2 { margin-top: 20px; }
.mt-3 { margin-top: 30px; }
.mb-1 { margin-bottom: 10px; }
.mb-2 { margin-bottom: 20px; }
.mb-3 { margin-bottom: 30px; }
.p-1 { padding: 10px; }
.p-2 { padding: 20px; }

.hidden { display: none; }