/* Base Styles */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
    color: var(--gray-100);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Cards */
.card {
    background: var(--gray-800);
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--gray-700);
}

/* Typography */
h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: white;
}

h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: white;
}

h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.subtitle {
    color: var(--gray-400);
    margin-bottom: 24px;
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--gray-200);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-600);
    border-radius: 8px;
    background: var(--gray-700);
    color: white;
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-group small {
    display: block;
    margin-top: 4px;
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.875rem;
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-danger {
    background: var(--danger);
    color: white;
}

/* Signup Page */
.signup-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 40px);
}

.signup-page .card {
    width: 100%;
    max-width: 480px;
}

.signup-form {
    margin-top: 24px;
}

/* Payment Page */
.payment-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 40px);
    padding: 20px;
}

.payment-page .card {
    width: 100%;
    max-width: 600px;
}

.payment-details {
    background: var(--gray-700);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--gray-600);
}

.detail-row:last-child {
    border-bottom: none;
}

.detail-row .label {
    color: var(--gray-400);
}

.discount-badge {
    background: var(--success);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    margin-left: 8px;
}

.payment-box {
    background: var(--gray-900);
    border-radius: 8px;
    padding: 24px;
    text-align: center;
    margin-bottom: 24px;
}

.network-info {
    color: var(--gray-400);
    margin-bottom: 16px;
}

.amount-display {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.amount-display .currency {
    color: var(--primary);
}

.qr-code {
    margin: 20px 0;
}

.qr-code img {
    max-width: 200px;
    border-radius: 8px;
}

.address-box {
    margin-top: 20px;
}

.address-box label {
    display: block;
    color: var(--gray-400);
    margin-bottom: 8px;
}

.address-copy {
    display: flex;
    gap: 8px;
}

.address-copy input {
    flex: 1;
    padding: 10px;
    background: var(--gray-700);
    border: 1px solid var(--gray-600);
    border-radius: 6px;
    color: white;
    font-family: monospace;
    font-size: 0.875rem;
}

.status-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
    padding: 12px;
    background: var(--gray-800);
    border-radius: 8px;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.status-indicator.pending {
    background: var(--warning);
    animation: pulse 2s infinite;
}

.status-indicator.confirming {
    background: var(--primary);
    animation: pulse 1s infinite;
}

.status-indicator.confirmed {
    background: var(--success);
}

.status-box.confirmed {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid var(--success);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.credentials-box {
    background: var(--gray-700);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 24px;
}

.credentials-box .note {
    color: var(--warning);
    font-size: 0.875rem;
    margin-bottom: 16px;
}

.credential {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.credential label {
    color: var(--gray-400);
    min-width: 80px;
}

.credential code {
    background: var(--gray-800);
    padding: 8px 12px;
    border-radius: 4px;
    font-family: monospace;
    flex: 1;
}

.info-box {
    background: var(--gray-700);
    border-radius: 8px;
    padding: 20px;
}

.info-box h4 {
    margin-bottom: 12px;
}

.info-box ol {
    padding-left: 20px;
}

.info-box li {
    margin-bottom: 8px;
    color: var(--gray-300);
}

/* Login Page */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 40px);
}

.login-card {
    width: 100%;
    max-width: 400px;
}

.login-form {
    margin-top: 24px;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
}

.alert-error {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid var(--danger);
    color: #fca5a5;
}

.alert-success {
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid var(--success);
    color: #6ee7b7;
}

/* Error Page */
.error-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 40px);
    text-align: center;
}

.error-content h1 {
    font-size: 6rem;
    color: var(--primary);
    margin-bottom: 16px;
}

.error-content p {
    color: var(--gray-400);
    margin-bottom: 24px;
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 12px;
    }

    .card {
        padding: 24px 20px;
    }

    h1 {
        font-size: 1.5rem;
    }

    .amount-display {
        font-size: 1.5rem;
    }
}