/* static/css/style.css */
:root {
    --primary-color: #0D6EFD; /* A bright, energetic blue */
    --primary-hover: #0a58ca;
    --secondary-color: #343a40;
    --secondary-hover: #495057;
    --bg-color: #121212;      /* Main background */
    --card-bg: #1e1e1e;      /* Card background */
    --border-color: #333;   
    --text-color: #e0e0e0;
    --text-muted: #888;
    --success-bg: #198754;
    --warning-bg: #ffc107;
    --danger-bg: #dc3545;
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* --- General --- */
body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding-top: 80px; /* Space for fixed nav */
    line-height: 1.6;
}

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.2;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.2s ease;
}
a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Navigation --- */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 0 1rem;
    z-index: 1000;
}
nav .container {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-brand {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
}
.nav-brand:hover {
    text-decoration: none;
    color: var(--text-color);
}
.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: var(--primary-color);
    color: #fff;
}
.btn:hover {
    background-color: var(--primary-hover);
    color: #fff;
    text-decoration: none;
}
.btn.btn-secondary {
    background-color: var(--secondary-color);
}
.btn.btn-secondary:hover {
    background-color: var(--secondary-hover);
}
.btn.btn-large {
    font-size: 1.1rem;
    padding: 0.8rem 1.5rem;
}

/* --- Forms --- */
.card-form {
    max-width: 500px;
    margin: 2rem auto;
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}
.card-form h2 {
    text-align: center;
    margin-top: 0;
    margin-bottom: 2rem;
}
.form-group {
    margin-bottom: 1.25rem;
}
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="file"] {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-color);
    box-sizing: border-box; /* Important */
}
.form-group input[type="file"] {
    padding: 0.5rem;
}
.form-group-row {
    display: flex;
    gap: 1rem;
}
.form-group-row .form-group {
    flex: 1;
}
.card-form button[type="submit"] {
    width: 100%;
    font-size: 1.1rem;
    padding: 0.8rem;
}
.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-muted);
}

/* --- Hero Section (Landing Page) --- */
.hero {
    text-align: center;
    padding: 4rem 0;
}
.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}
.hero .subtitle {
    font-size: 1.5rem;
    color: var(--text-muted);
    font-weight: 300;
    margin-bottom: 2rem;
}
.hero p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 2rem auto;
}
.hero-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

/* --- Dashboard Cards --- */
.card {
    background-color: var(--card-bg);
    padding: 1.5rem 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.stat-number {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
    line-height: 1;
}
.referral-code {
    width: 100%;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    padding: 0.5rem;
    background: var(--bg-color);
    border: 1px dashed var(--primary-color);
    border-radius: 8px;
    color: var(--text-color);
    box-sizing: border-box;
    margin-top: 1rem;
}
.status-card-success {
    background-color: var(--success-bg);
    color: #fff;
}
.status-card-pending {
    background-color: #ffc107;
    color: #000;
}

/* --- Dashboard Tabs --- */
.tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}
.tab-link {
    padding: 0.8rem 1.2rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 600;
    border-bottom: 3px solid transparent;
}
.tab-link.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}
.tab-content {
    display: none;
}

/* --- Flash Messages --- */
.flash-messages {
    padding: 0;
    margin: 0 0 1.5rem 0;
}
.flash {
    list-style: none;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-weight: 600;
}
.flash-success { background-color: var(--success-bg); color: #fff; }
.flash-danger { background-color: var(--danger-bg); color: #fff; }
.flash-info, .flash-warning { background-color: var(--warning-bg); color: #000; }

/* --- Responsive --- */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .hero .subtitle { font-size: 1.2rem; }
    .hero-actions { flex-direction: column; }
    .form-group-row { flex-direction: column; gap: 0; }
    
    nav .container {
        flex-direction: column;
        height: auto;
        padding-top: 0.5rem;
    }
    body { padding-top: 100px; }
}