/* === Reset & Base === */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary: #4CAF50;
    --primary-dark: #388E3C;
    --primary-light: #C8E6C9;
    --bg: #FAFAFA;
    --card-bg: #FFFFFF;
    --text: #212121;
    --text-secondary: #757575;
    --border: #E0E0E0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --error: #E53935;
    --success: #4CAF50;
}

body {
    font-family: 'Roboto', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* === Navbar === */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.logo:hover {
    text-decoration: none;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* === Buttons === */
.btn {
    display: inline-block;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn:hover {
    text-decoration: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-lg {
    padding: 14px 36px;
    font-size: 1.05rem;
}

.btn-outline {
    border: 1px solid var(--border);
    color: var(--text-secondary);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--text-secondary);
    color: var(--text);
}

.btn-text {
    color: var(--primary);
    background: transparent;
    padding: 8px 12px;
}

.btn-text:hover {
    background: var(--primary-light);
}

/* === Error Banner === */
.error-banner {
    background: #FFEBEE;
    color: var(--error);
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    margin-top: 20px;
    font-size: 0.95rem;
}

.error-banner a {
    color: var(--error);
    font-weight: 500;
    text-decoration: underline;
}

/* === Hero === */
.hero {
    text-align: center;
    padding: 80px 0 60px;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 32px;
}

.hero-price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 32px;
}

.hero-price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-secondary);
}

/* === Features === */
.features {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 40px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s;
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* === How it Works === */
.how-it-works {
    padding: 60px 0 80px;
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.step {
    text-align: center;
    padding: 24px;
}

.step-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.step h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.step p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* === Dashboard === */
.dashboard {
    padding: 40px 20px 60px;
}

.dashboard h1 {
    font-size: 1.75rem;
    margin-bottom: 4px;
}

.dashboard-greeting {
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.card h3 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--text);
}

.card-detail {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 6px;
}

.badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.badge-active {
    background: var(--primary-light);
    color: var(--primary-dark);
}

.badge-expired {
    background: #FFEBEE;
    color: var(--error);
}

.balance-amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.referral-link {
    margin-top: 12px;
}

.referral-link label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.referral-link input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--text);
    background: var(--bg);
    cursor: pointer;
}

/* === Payments Table === */
.payments-card {
    overflow: hidden;
}

.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

thead th {
    text-align: left;
    padding: 10px 16px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

tbody td {
    padding: 10px 16px;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border);
}

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

.amount-positive {
    color: var(--success);
    font-weight: 500;
}

.amount-negative {
    color: var(--error);
    font-weight: 500;
}

/* === Footer === */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    padding: 20px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* === Responsive === */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-price {
        font-size: 1.5rem;
    }

    .features-grid,
    .steps,
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .dashboard {
        padding: 24px 16px 40px;
    }
}