/* Author Website - Minimalist Bold Design with Dark/Light Mode */

/* Import Creative Fonts */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;700;900&family=Inter:wght@300;400;600;700&display=swap');

/* CSS Variables - Light Mode (Pastel) */
:root {
    /* Pastel Color Palette */
    --color-primary: #9b87c7;        /* Soft purple */
    --color-secondary: #f4a6d7;      /* Soft pink */
    --color-accent: #a8d5e2;         /* Soft blue */
    --color-bg: #fdfcf9;             /* Warm white */
    --color-surface: #ffffff;
    --color-text: #2d2d2d;
    --color-text-light: #666666;
    --color-border: #e5e5e5;
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-primary: #b8a8d9;
    --color-secondary: #f7b8dc;
    --color-accent: #b8e0ed;
    --color-bg: #1a1a1a;
    --color-surface: #2d2d2d;
    --color-text: #f0f0f0;
    --color-text-light: #b0b0b0;
    --color-border: #404040;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    letter-spacing: -2px;
}

h2 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    letter-spacing: -1px;
}

h3 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

p {
    margin-bottom: var(--spacing-sm);
    font-size: clamp(1rem, 2vw, 1.125rem);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--color-secondary);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    transition: var(--transition);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-link:hover {
    color: var(--color-primary);
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 2px solid var(--color-border);
    color: var(--color-text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

/* Mobile Menu Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition);
}

/* Hero Section (Full Page) */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    position: relative;
}

.hero-content {
    max-width: 900px;
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--color-text-light);
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: inline-flex;
    gap: var(--spacing-sm);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-weight: 600;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: 2px solid var(--color-primary);
    background: var(--color-primary);
    color: white;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn:hover {
    background: transparent;
    color: var(--color-primary);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Section */
.section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

/* Books Grid */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.book-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
    transition: var(--transition);
    cursor: pointer;
}

.book-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.book-cover {
    width: 100%;
    aspect-ratio: 2/3;
    object-fit: cover;
    margin-bottom: var(--spacing-sm);
}

.book-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.book-subtitle {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
}

.book-description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Book Detail Page */
.book-detail {
    padding: calc(80px + var(--spacing-xl)) 0 var(--spacing-xl);
}

.book-detail-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.book-detail-cover {
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
}

.book-detail-info h1 {
    margin-bottom: var(--spacing-xs);
}

.book-detail-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-light);
    font-weight: 300;
    margin-bottom: var(--spacing-md);
}

.book-detail-description {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.book-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.book-link {
    padding: 0.75rem 1.5rem;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    color: var(--color-text);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: var(--transition);
}

.book-link:hover {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

.book-excerpt {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-left: 4px solid var(--color-primary);
    margin: var(--spacing-lg) 0;
}

.book-excerpt h3 {
    margin-bottom: var(--spacing-md);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-photo {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 50%;
    box-shadow: var(--shadow-lg);
}

.about-content {
    font-size: 1.125rem;
    line-height: 1.8;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: var(--spacing-lg) auto;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 2px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition);
}

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

.form-message {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    text-align: center;
    font-weight: 600;
    display: none;
}

.form-message.success {
    background: #d4edda;
    color: #155724;
    display: block;
}

.form-message.error {
    background: #f8d7da;
    color: #721c24;
    display: block;
}

/* Footer */
.footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.social-link {
    color: var(--color-text-light);
    transition: var(--transition);
}

.social-link:hover {
    color: var(--color-primary);
}

.footer-text {
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--color-surface);
        flex-direction: column;
        padding: var(--spacing-lg);
        transition: var(--transition);
        border-top: 1px solid var(--color-border);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .book-detail-grid {
        grid-template-columns: 1fr;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-cta {
        flex-direction: column;
    }
}

/* Loading State */
.loading {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--color-text-light);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }