:root {
    /* Material You color palette - Dark teal theme */
    --primary: #00897b;
    --primary-light: #26a69a;
    --primary-dark: #00695c;
    --secondary: #00897b;
    --surface: #121212;
    --surface-variant: #1e1e1e;
    --on-surface: #ffffff;
    --on-surface-variant: #b0b0b0;
    --error: #f44336;
    --success: #4caf50;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, sans-serif;
    --font-size-body: 1rem;
    --font-size-title: 1.75rem;
    --font-size-headline: 2rem;

    /* Border radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    width: 100%;
    height: 100%;
}

body {
    font-family: var(--font-family);
    background-color: var(--surface);
    color: var(--on-surface);
    font-size: var(--font-size-body);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: var(--spacing-lg);
    }
}

/* Header */
.header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
}

.header h1 {
    font-size: var(--font-size-headline);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header .subtitle {
    color: var(--on-surface-variant);
    font-size: 1.1rem;
}

/* Gifts Grid */
.gifts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .gifts-grid {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: var(--spacing-xl);
    }
}

.gift-card {
    background-color: var(--surface-variant);
    border: 1px solid rgba(0, 137, 123, 0.3);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.gift-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 137, 123, 0.2);
}

.gift-card:active {
    transform: translateY(-2px);
}

.gift-emoji {
    font-size: 3rem;
    line-height: 1;
}

.gift-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--on-surface);
}

.gift-price {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-light);
}

.gift-card.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Buttons */
.btn-primary {
    display: inline-block;
    background-color: var(--primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    text-align: center;
}

.btn-primary:hover {
    background-color: var(--primary-light);
    transform: scale(1.02);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Messages */
.error-message,
.success-message {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
    animation: slideIn 0.3s ease-out;
}

.error-message {
    background-color: rgba(244, 67, 54, 0.1);
    color: #ff6b6b;
    border-left: 4px solid var(--error);
}

.success-message {
    background-color: rgba(76, 175, 80, 0.1);
    color: #66bb6a;
    border-left: 4px solid var(--success);
}

.error-message.hidden,
.success-message.hidden {
    display: none;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--on-surface-variant);
    font-size: 0.9rem;
    border-top: 1px solid rgba(0, 137, 123, 0.1);
}

/* Success/Cancelled Pages */
.success-page,
.cancelled-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    text-align: center;
    gap: var(--spacing-xl);
}

.success-icon,
.cancelled-icon {
    font-size: 5rem;
    line-height: 1;
    animation: bounce 0.6s ease-out;
}

.success-page h1,
.cancelled-page h1 {
    font-size: var(--font-size-headline);
    margin-bottom: var(--spacing-md);
}

.success-page p,
.cancelled-page p {
    color: var(--on-surface-variant);
    margin-bottom: var(--spacing-xl);
    max-width: 400px;
}

/* Loading spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* Animations */
@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    body {
        background-color: white;
        color: black;
    }

    .footer {
        display: none;
    }
}