:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #059669;
    --dark: #1f2937;
    --light: #f8fafc;
    --gray: #6b7280;
    --border: #e5e7eb;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg-gradient);
    min-height: 100vh;
    color: var(--dark);
    line-height: 1.6;
}

/* Header & Navigation */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1.5rem 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
}

.header h1 {
    color: var(--primary);
    font-size: 2.2rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.header p {
    color: var(--gray);
    font-size: 1rem;
}

.nav {
    background: white;
    padding: 0.8rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.nav a {
    text-decoration: none;
    color: var(--dark);
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 0.95rem;
}

.nav a:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

.nav a.active {
    background: var(--primary);
    color: white;
}

/* Container & Cards */
.container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

.content-card {
    background: white;
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--primary);
    margin-bottom: 1.2rem;
}

h2 { font-size: 2rem; text-align: center; }
h3 { font-size: 1.5rem; margin-top: 1.5rem; }

p {
    margin-bottom: 1rem;
    color: var(--dark);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--dark);
}

input[type="text"],
input[type="number"],
input[type="password"],
input[type="email"],
input[type="date"],
input[type="file"],
select,
textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    background: var(--light);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
}

button, .btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    text-align: center;
}

button:hover, .btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.4);
}

.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.btn-secondary {
    background: var(--secondary);
}
.btn-secondary:hover {
    background: #047857;
    box-shadow: 0 4px 12px rgba(5, 150, 105, 0.3);
}

/* Progress Bar */
.progress {
    background: var(--light);
    border-radius: 50px;
    height: 12px;
    overflow: hidden;
    margin: 1rem 0;
    border: 1px solid var(--border);
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    height: 100%;
    transition: width 0.5s ease-out;
}

/* Projects Grid/List */
.project {
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    margin-bottom: 1.5rem;
    overflow: hidden;
    border: 1px solid var(--border);
    transition: transform 0.3s ease;
}

.project:hover {
    transform: translateY(-5px);
}

.project img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.project-content {
    padding: 1.5rem;
}

/* Table styles */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    background: white;
    border-radius: 12px;
    overflow: hidden;
}

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

th {
    background: var(--light);
    color: var(--primary);
    font-weight: 700;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background: #f8fafc;
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.alert-success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.alert-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }

/* Responsive */
@media (max-width: 768px) {
    .header h1 { font-size: 1.8rem; }
    .content-card { padding: 1.5rem; }
    .nav-container { gap: 0.8rem; }
}