:root {
    --bg-color: #0D0D1A;
    --primary-purple: #7C3AED;
    --primary-blue: #38BDF8;
    --text-main: #FFFFFF;
    --text-muted: #9AA3B5;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-body);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow-x: hidden;
}

/* Background Effects */
.background-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
}

.grid-bg {
    position: absolute;
    width: 200vw;
    height: 200vh;
    top: -50vh;
    left: -50vw;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    transform: perspective(500px) rotateX(60deg) translateY(-100px) translateZ(-200px);
    animation: gridMove 20s linear infinite;
    z-index: 0;
}

@keyframes gridMove {
    0% { transform: perspective(500px) rotateX(60deg) translateY(0) translateZ(-200px); }
    100% { transform: perspective(500px) rotateX(60deg) translateY(50px) translateZ(-200px); }
}

.glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: float 10s infinite ease-in-out alternate;
}

.glow-purple {
    background: var(--primary-purple);
    top: -10%;
    left: -10%;
}

.glow-blue {
    background: var(--primary-blue);
    bottom: -10%;
    right: -10%;
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(50px, 50px) scale(1.1); }
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    margin: 0 auto;
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

@media (max-width: 900px) {
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

/* Book Presentation */
.badge {
    display: inline-block;
    background: rgba(56, 189, 248, 0.1);
    color: var(--primary-blue);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(56, 189, 248, 0.2);
}

.book-presentation h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.1;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.book-presentation h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--primary-purple);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.book-presentation p {
    color: var(--text-muted);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 2.5rem;
    max-width: 90%;
}

.book-cover-container {
    position: relative;
    max-width: 350px;
    margin: 0 auto;
    perspective: 1000px;
}

.book-cover {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.1);
    transform: rotateY(-5deg) rotateX(5deg);
    transition: transform 0.5s ease;
    position: relative;
    z-index: 2;
}

.book-cover-container:hover .book-cover {
    transform: rotateY(0deg) rotateX(0deg);
}

.cover-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: var(--primary-purple);
    filter: blur(60px);
    opacity: 0.5;
    z-index: 1;
}

/* Glass Panel Form */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem 2.5rem;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.3);
}

.glass-panel h3 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    margin-bottom: 2rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: #cbd5e1;
}

.form-group input[type="text"],
.form-group input[type="email"] {
    width: 100%;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem 1.25rem;
    border-radius: 12px;
    color: white;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-blue);
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.1);
}

/* Format Selection Cards */
.format-selection {
    margin-top: 1.5rem;
}

.format-cards {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.format-card {
    flex: 1;
    position: relative;
    cursor: pointer;
}

.format-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.card-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    transition: all 0.3s ease;
    gap: 0.5rem;
    color: var(--text-muted);
}

.card-content svg {
    margin-bottom: 0.25rem;
    transition: all 0.3s ease;
}

.format-card:hover .card-content {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
}

.format-card input[type="radio"]:checked + .card-content {
    background: rgba(124, 58, 237, 0.1);
    border-color: var(--primary-purple);
    color: white;
    box-shadow: 0 0 15px rgba(124, 58, 237, 0.3), inset 0 0 10px rgba(124, 58, 237, 0.1);
}

.format-card input[type="radio"]:checked + .card-content svg {
    color: var(--primary-blue);
    transform: scale(1.1);
}

.format-card input[type="radio"]:focus-visible + .card-content {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* Checkbox Styling */
.privacy-group {
    margin-top: 2rem;
    margin-bottom: 2rem;
}

.checkbox-container {
    display: block;
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 2px;
    left: 0;
    height: 20px;
    width: 20px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    transition: all 0.2s ease;
}

.checkbox-container:hover input ~ .checkmark {
    background-color: rgba(255, 255, 255, 0.1);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--primary-purple);
    border-color: var(--primary-purple);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

/* Button */
.btn-glow {
    width: 100%;
    padding: 1.25rem;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-blue) 100%);
    color: white;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.btn-glow::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.btn-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(124, 58, 237, 0.3);
}

.btn-glow:hover::before {
    left: 100%;
}

.btn-glow:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

/* Loader */
.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
    margin-left: 10px;
}

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

.form-message {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
    min-height: 20px;
}

.message-error { color: #ef4444; }
.message-success { color: #10b981; }

@media (max-width: 480px) {
    .glass-panel { padding: 2rem 1.5rem; }
    .book-presentation h1 { font-size: 2rem; }
}