:root {
    /* Background colors */
    --color-bg-dark: #0a0e1a;
    --color-bg-darker: #000000;
    
    /* Text colors */
    --color-text-primary: #e0e7ff;
    --color-text-secondary: #c7d2fe;
    --color-text-tertiary: #a5b4fc;
    --color-text-accent: #818cf8;
    
    /* Accent colors (semantic - change these to swap entire palette) */
    --color-accent-primary: #8a2be2;
    --color-accent-secondary: #1e90ff;
    --color-accent-tertiary: #9370db;
    --color-accent-light: #87ceeb;
    --color-accent-medium: #ba55d3;
    --color-accent-dark: #4b0082;
    
    /* UI element colors */
    --color-ui-card-bg: rgba(26, 10, 46, 0.95);
    --color-ui-card-bg-light: rgba(26, 10, 46, 0.9);
    --color-ui-input-bg: rgba(10, 14, 26, 0.8);
    --color-ui-input-bg-focus: rgba(10, 14, 26, 0.9);
    --color-ui-border: rgba(138, 43, 226, 0.3);
    --color-ui-border-focus: rgba(138, 43, 226, 0.6);
    --color-ui-glow: rgba(138, 43, 226, 0.4);
    --color-ui-glow-strong: rgba(138, 43, 226, 0.5);
    --color-ui-shadow: rgba(138, 43, 226, 0.3);
    --color-ui-shadow-strong: rgba(30, 144, 255, 0.2);
    
    /* Form state colors */
    --color-form-success-bg: rgba(34, 197, 94, 0.2);
    --color-form-success-border: rgba(34, 197, 94, 0.4);
    --color-form-success-text: #86efac;
    --color-form-error-bg: rgba(239, 68, 68, 0.2);
    --color-form-error-border: rgba(239, 68, 68, 0.4);
    --color-form-error-text: #fca5a5;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

html, body {
    height: 300vh;
    overflow-x: hidden;
    overscroll-behavior-y: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background: var(--color-bg-darker);
    color: var(--color-text-primary);
    position: relative;
}

#space-scene {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    z-index: 0;
    will-change: contents;
    transform: translateZ(0);
    transition: opacity 0.3s ease;
}


.hero-content {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate3d(-50%, -50%, 0);
    text-align: center;
    z-index: 10;
    max-width: 800px;
    padding: 40px 20px;
    pointer-events: none;
    will-change: transform, opacity;
    backface-visibility: hidden;
    contain: layout style paint;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 300;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 50%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 40px rgba(138, 43, 226, 0.3);
    opacity: 1;
}

.hero-subtitle {
    font-size: clamp(2rem, 6vw, 4rem);
    font-weight: 200;
    letter-spacing: 0.2em;
    margin-bottom: 30px;
    color: #c7d2fe;
    text-shadow: 0 0 30px rgba(138, 43, 226, 0.4);
    opacity: 1;
}

.hero-description {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
    font-weight: 300;
    color: var(--color-text-tertiary);
    margin-bottom: 40px;
    opacity: 0.9;
}

.scroll-indicator {
    font-size: 2rem;
    color: var(--color-text-accent);
    animation: bounce 2s ease-in-out infinite;
    margin-top: 20px;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(10px); }
}

.date-time-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate3d(-50%, -50%, 0);
    width: 90%;
    will-change: transform, opacity;
    backface-visibility: hidden;
    max-width: 500px;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
}

.date-time-container.visible {
    opacity: 1;
    pointer-events: all;
}

.date-time-content {
    background: var(--color-ui-card-bg-light);
    padding: 30px;
    border-radius: 20px;
    border: 2px solid var(--color-ui-border);
    box-shadow: 0 0 60px var(--color-ui-shadow-strong);
    text-align: center;
    will-change: transform, opacity;
    transform: translateZ(0);
    contain: layout style paint;
}

.date-time-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 300;
    margin-bottom: 25px;
    color: var(--color-text-primary);
    text-shadow: 0 0 15px var(--color-ui-glow-strong);
    letter-spacing: 0.1em;
}

.date-time-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-ui-border);
}

.info-item:last-child {
    border-bottom: none;
}

.info-label {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-secondary);
    font-weight: 300;
    opacity: 0.8;
}

.info-value {
    font-size: clamp(1.1rem, 2.2vw, 1.3rem);
    color: var(--color-text-primary);
    font-weight: 400;
    text-shadow: 0 0 10px var(--color-ui-glow-strong);
}

.rsvp-container {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate3d(-50%, -50%, 0);
    width: 90%;
    will-change: transform, opacity;
    backface-visibility: hidden;
    max-width: 600px;
    z-index: 10;
    opacity: 0;
    pointer-events: none;
    contain: layout style paint;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.rsvp-container.visible {
    opacity: 1;
    pointer-events: all;
}

.rsvp-content {
    background: var(--color-ui-card-bg);
    padding: 40px;
    border-radius: 20px;
    border: 2px solid var(--color-ui-border);
    box-shadow: 0 0 80px var(--color-ui-shadow-strong);
    text-align: center;
    overflow: hidden;
    will-change: transform, opacity;
    transform: translateZ(0);
    contain: layout style paint;
    max-height: 90vh;
    width: 100%;
    max-width: 600px;
}

.rsvp-content .rsvp-form {
    pointer-events: none;
}

.rsvp-content .rsvp-form input,
.rsvp-content .rsvp-form textarea,
.rsvp-content .rsvp-form button {
    pointer-events: auto;
    cursor: pointer;
}

.rsvp-content .rsvp-form input:not([type="hidden"]):focus,
.rsvp-content .rsvp-form textarea:focus {
    outline: none;
    border-color: var(--color-ui-border);
    box-shadow: 0 0 20px var(--color-ui-shadow);
    background: var(--color-ui-input-bg-focus);
}

.form-view {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    background: var(--color-ui-card-bg);
    overflow-y: auto;
}

.rsvp-content-fullscreen {
    position: relative;
    z-index: 1;
    width: 100%;
    min-height: 100vh;
    padding: 80px 40px 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.rsvp-content-fullscreen .rsvp-form {
    width: 100%;
}

.form-content,
.thank-you-content {
    width: 100%;
    text-align: center;
}

.thank-you-message {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-secondary);
    margin-top: 20px;
    opacity: 0.9;
}

.thank-you-image {
    width: 100%;
    max-width: 500px;
    height: auto;
    margin-top: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.thank-you-box {
    margin-top: 30px;
    padding: 25px;
    background: var(--color-ui-input-bg);
    border: 1px solid var(--color-ui-border);
    border-radius: 10px;
    text-align: left;
}

.thank-you-info {
    font-size: clamp(0.9rem, 1.8vw, 1.1rem);
    color: var(--color-text-tertiary);
    margin-top: 15px;
    opacity: 0.8;
}

.thank-you-info:first-child {
    margin-top: 0;
}

.thank-you-note {
    font-size: clamp(0.75rem, 1.5vw, 0.9rem);
    color: var(--color-text-accent);
    margin-top: 20px;
    opacity: 0.6;
    font-style: italic;
}

.rsvp-content::-webkit-scrollbar {
    width: 6px;
}

.rsvp-content::-webkit-scrollbar-track {
    background: transparent;
}

.rsvp-content::-webkit-scrollbar-thumb {
    background: var(--color-ui-border);
    border-radius: 3px;
}

.rsvp-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-ui-border-focus);
}

.rsvp-close-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 2px solid var(--color-ui-border);
    background: var(--color-ui-card-bg);
    color: var(--color-text-primary);
    font-size: 32px;
    font-weight: 300;
    line-height: 1;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    transition: all 0.3s ease;
    box-shadow: 0 0 20px var(--color-ui-shadow);
}

.rsvp-close-btn:hover {
    border-color: var(--color-ui-border-focus);
    box-shadow: 0 0 20px var(--color-ui-glow);
    transform: scale(1.1);
    background: var(--color-ui-input-bg-focus);
}

.rsvp-close-btn:active {
    transform: scale(0.95);
}

.rsvp-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 300;
    margin-bottom: 15px;
    color: var(--color-text-primary);
    text-shadow: 0 0 20px var(--color-ui-glow-strong);
    letter-spacing: 0.1em;
}

.rsvp-description {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-secondary);
    margin-bottom: 30px;
    opacity: 0.9;
}

.rsvp-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 20px;
}

.form-group {
    position: relative;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
    opacity: 0.8;
}

.rsvp-form > input[type="text"] {
    width: 100%;
    padding: 15px 20px;
    margin-bottom: 20px;
    background: var(--color-ui-input-bg);
    border: 1px solid var(--color-ui-border);
    border-radius: 10px;
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.rsvp-form > input[type="text"]::placeholder {
    color: var(--color-text-accent);
    opacity: 0.6;
}

.rsvp-form > input[type="text"]:focus {
    outline: none;
    border-color: var(--color-ui-border-focus);
    box-shadow: 0 0 20px var(--color-ui-shadow);
    background: var(--color-ui-input-bg-focus);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--color-ui-input-bg);
    border: 1px solid var(--color-ui-border);
    border-radius: 10px;
    color: var(--color-text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-text-accent);
    opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-ui-border-focus);
    box-shadow: 0 0 20px var(--color-ui-shadow);
    background: var(--color-ui-input-bg-focus);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.guest-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    background: var(--color-ui-input-bg);
    border: 1px solid var(--color-ui-border);
    border-radius: 15px;
    transition: all 0.3s ease;
}

.guest-selector:focus-within {
    border-color: var(--color-ui-border-focus);
    box-shadow: 0 0 20px var(--color-ui-shadow);
    background: var(--color-ui-input-bg-focus);
}

.guest-number-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
}

.guest-number-btn {
    width: 65px;
    height: 65px;
    border-radius: 50%;
    border: 2px solid var(--color-ui-border);
    background: var(--color-ui-card-bg);
    color: var(--color-text-primary);
    font-size: 24px;
    font-weight: 300;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    flex-shrink: 0;
    transform: translateZ(0);
}

.guest-number-btn:hover {
    border-color: var(--color-ui-border-focus);
    box-shadow: 0 0 20px var(--color-ui-glow);
    transform: scale(1.1) translateZ(0);
}

.guest-number-btn:active {
    transform: scale(0.95) translateZ(0);
}

.guest-number-btn.active {
    border-color: var(--color-ui-border-focus);
    background: var(--color-ui-input-bg-focus);
    box-shadow: 0 0 20px var(--color-ui-glow);
    transform: scale(1.05) translateZ(0);
}

@media (max-width: 480px) {
    .rsvp-content {
        padding: 20px 15px;
    }
    
    .rsvp-close-btn {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 28px;
    }
    
    .guest-selector {
        padding: 10px 8px;
    }
    
    .guest-number-buttons {
        gap: 12px;
        flex-wrap: nowrap;
    }
    
    .guest-number-btn {
        width: 50px;
        height: 50px;
        font-size: 18px;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    .rsvp-form {
        gap: 15px;
    }
}

.rsvp-button {
    padding: 16px 40px;
    background: linear-gradient(135deg, 
        rgba(138, 43, 226, 0.8) 0%, 
        rgba(30, 144, 255, 0.8) 100%);
    border: 1px solid var(--color-ui-border-focus);
    border-radius: 10px;
    color: var(--color-text-primary);
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    box-shadow: 
        0 10px 30px var(--color-ui-shadow),
        inset 0 0 20px var(--color-ui-glow);
    margin-top: 10px;
}

.rsvp-button:hover {
    transform: translateY(-2px);
    box-shadow: 
        0 15px 40px var(--color-ui-glow-strong),
        inset 0 0 30px var(--color-ui-glow-strong);
    background: linear-gradient(135deg, 
        rgba(138, 43, 226, 0.9) 0%, 
        rgba(30, 144, 255, 0.9) 100%);
}

.rsvp-button:active {
    transform: translateY(0);
}

.form-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.form-message.show {
    opacity: 1;
}

.form-message.success {
    background: var(--color-form-success-bg);
    border: 1px solid var(--color-form-success-border);
    color: var(--color-form-success-text);
}

.form-message.error {
    background: var(--color-form-error-bg);
    border: 1px solid var(--color-form-error-border);
    color: var(--color-form-error-text);
}

.scroll-progress {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 4px;
    background: var(--color-ui-border);
    border-radius: 2px;
    z-index: 100;
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, 
        rgba(138, 43, 226, 0.8) 0%, 
        rgba(30, 144, 255, 0.8) 100%);
    border-radius: 2px;
    transition: width 0.1s ease;
}

@media (max-width: 768px) {
    .hero-content {
        padding: 20px 15px;
    }
    
    .date-time-content {
        padding: 25px 20px;
    }
    
    .rsvp-content {
        padding: 30px 20px;
    }
    
    .form-group input,
    .form-group textarea {
        font-size: 16px;
    }
    
    .rsvp-button {
        width: 100%;
        padding: 18px 30px;
    }
}

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