/* GitBook-inspired minimal design */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #000;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-border: #e2e8f0;
    --color-border-light: #f7fafc;
    --color-bg: #fff;
    --color-bg-alt: #fafbfc;
    --color-success: #10b981;
    --color-error: #ef4444;
    --color-warning: #f59e0b;
    --radius: 6px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 12px rgba(0,0,0,0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    font-size: 14px;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 40px 24px;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 48px;
}

.logo h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 16px;
    color: var(--color-text-light);
    font-weight: 400;
}

/* Cards */
.redemption-card,
.instructions-card,
.faq-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
}

.card-header {
    margin-bottom: 24px;
}

.card-header h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.card-header p {
    color: var(--color-text-light);
    font-size: 14px;
}

/* Form */
.redemption-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-weight: 500;
    color: var(--color-text);
    font-size: 14px;
}

.input-group input {
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 14px;
    background: var(--color-bg);
    transition: border-color 0.2s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.input-hint small {
    color: var(--color-text-light);
    font-size: 12px;
}

/* Button */
.redeem-btn {
    background: var(--color-primary);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.redeem-btn:hover:not(:disabled) {
    opacity: 0.8;
}

.redeem-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.security-info {
    padding: 16px;
    background: var(--color-bg-alt);
    border-radius: var(--radius);
    border-left: 3px solid var(--color-warning);
}

.security-info small {
    color: var(--color-text);
    font-size: 12px;
    line-height: 1.5;
}

/* Results */
.result-container {
    margin-top: 24px;
}

.result {
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}

.success-result {
    background: #f0f9f3;
    border: 1px solid #c6f6d5;
    color: #22543d;
}

.error-result {
    background: #fef5f5;
    border: 1px solid #fed7d7;
    color: #742a2a;
}

.result-header h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
}

.redemption-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 20px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    font-size: 14px;
}

.info-item label {
    font-weight: 500;
}

.redemption-link-section h4 {
    margin-bottom: 12px;
    font-size: 14px;
    font-weight: 600;
}

.link-container {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.link-container input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid currentColor;
    border-radius: var(--radius);
    background: transparent;
    color: inherit;
    font-size: 12px;
    opacity: 0.8;
}

.copy-btn {
    background: transparent;
    color: inherit;
    border: 1px solid currentColor;
    padding: 8px 16px;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 12px;
    font-weight: 500;
    transition: opacity 0.2s ease;
}

.copy-btn:hover {
    opacity: 0.8;
}

.tutorial-section {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid currentColor;
    opacity: 0.8;
}

.tutorial-section h4 {
    margin-bottom: 12px;
    font-size: 14px;
    font-weight: 600;
}

.tutorial-content {
    font-size: 13px;
    line-height: 1.6;
}

.tutorial-steps {
    margin: 0;
    padding-left: 16px;
}

.tutorial-steps li {
    margin-bottom: 8px;
}

.tutorial-warning {
    margin-top: 12px;
    padding: 12px;
    background: rgba(0,0,0,0.05);
    border-radius: var(--radius);
    font-size: 12px;
}

.attempts-info {
    margin-top: 12px;
    padding: 8px 12px;
    background: rgba(0,0,0,0.05);
    border-radius: var(--radius);
    text-align: center;
    font-size: 12px;
}

/* Instructions */
.instructions-card h3,
.faq-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.instructions-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.instruction-step {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.step-number {
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 12px;
    flex-shrink: 0;
}

.step-content h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.step-content p {
    color: var(--color-text-light);
    font-size: 14px;
    line-height: 1.5;
}

/* FAQ */
.faq-content {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.faq-item h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.faq-item p {
    color: var(--color-text-light);
    font-size: 14px;
    line-height: 1.5;
}

/* Footer */
.footer {
    margin-top: 48px;
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.footer-links a {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 12px;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--color-text);
}

/* Loading */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255,255,255,0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    text-align: center;
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 16px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 24px 16px;
    }
    
    .redemption-card,
    .instructions-card,
    .faq-card {
        padding: 24px;
    }
    
    .link-container {
        flex-direction: column;
    }
    
    .instruction-step {
        flex-direction: column;
        text-align: left;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
}

/* Copy success animation */
.copy-success {
    opacity: 0.6;
}

/* Focus states */
.redeem-btn:focus,
.copy-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.input-group input:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}