@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;600;700&display=swap');

:root {
    --primary: hsl(200, 100%, 45%);
    --primary-light: hsl(200, 100%, 70%);
    --primary-dark: hsl(200, 100%, 30%);
    --accent: hsl(180, 100%, 45%);
    --bg-dark: hsl(220, 20%, 10%);
    --bg-card: hsla(220, 20%, 15%, 0.7);
    --text-main: hsl(0, 0%, 95%);
    --text-dim: hsl(0, 0%, 75%);
    --glass-border: hsla(0, 0%, 100%, 0.1);
    --glass-bg: hsla(0, 0%, 100%, 0.05);
    --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Blurs */
.blur-blob {
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--primary-light), transparent 70%);
    filter: blur(80px);
    opacity: 0.15;
    z-index: -1;
    pointer-events: none;
    animation: float 20s infinite alternate linear;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(10%, 10%) scale(1.1); }
    66% { transform: translate(-10%, 5%) scale(0.9); }
    100% { transform: translate(0, 0) scale(1); }
}

.blur-1 { top: -100px; left: -100px; background: radial-gradient(circle, var(--primary), transparent 70%); }
.blur-2 { top: 40%; right: -150px; background: radial-gradient(circle, var(--accent), transparent 70%); }
.blur-3 { bottom: -100px; left: 20%; background: radial-gradient(circle, var(--primary-dark), transparent 70%); }

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: hsla(220, 20%, 10%, 0.5);
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dim);
    font-weight: 500;
    transition: var(--transition);
}

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

.nav-btns {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.8rem 1.8rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 15px hsla(200, 100%, 45%, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px hsla(200, 100%, 45%, 0.4);
}

.btn-outline {
    background: var(--glass-bg);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
}

.btn-outline:hover {
    background: hsla(0, 0%, 100%, 0.1);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 8rem 5% 4rem;
    position: relative;
}

.hero-content {
    max-width: 900px;
    margin-bottom: 4rem;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero h1 span {
    background: linear-gradient(90deg, var(--primary-light), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-dim);
    max-width: 700px;
    margin: 0 auto 2rem;
}

/* Ebook Viewer Preview Area */
.viewer-container {
    width: 100%;
    max-width: 1000px;
    height: 600px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.upload-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10;
}

.upload-overlay i {
    font-size: 3rem;
    color: var(--primary-light);
    margin-bottom: 1rem;
}

#pdf-upload {
    display: none;
}

#pdf-canvas {
    max-width: 90%;
    max-height: 80%;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    display: none;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Services */
.services {
    padding: 8rem 5%;
    background: hsla(220, 20%, 8%, 0.5);
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-card);
    padding: 2.5rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-light);
}

/* Slider Section */
.features-slider {
    padding: 8rem 0;
    overflow: hidden;
}

.slider-track {
    display: flex;
    gap: 2rem;
    padding: 0 5%;
    transition: transform 0.5s ease-out;
}

.slide {
    min-width: 400px;
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
}

/* Auth Section */
.auth-section {
    padding: 8rem 5%;
    display: flex;
    justify-content: center;
    gap: 4rem;
    flex-wrap: wrap;
}

.auth-form {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    width: 100%;
    max-width: 450px;
    backdrop-filter: blur(20px);
}

.auth-form h3 {
    font-size: 1.8rem;
    margin-bottom: 2rem;
    text-align: center;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dim);
}

.form-group input {
    width: 100%;
    padding: 1rem;
    background: hsla(0, 0%, 100%, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: white;
    outline: none;
    transition: var(--transition);
}

.form-group input:focus {
    border-color: var(--primary-light);
    background: hsla(0, 0%, 100%, 0.08);
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .viewer-container { height: 400px; }
    .nav-links { display: none; }
}