/* ============================================
   ZUPANOVICHO - The World's Most Difficult Word Find
   Premium Website Styles
   ============================================ */

:root {
    --bg-dark: #0a0a0f;
    --bg-card: #141420;
    --bg-card-hover: #1a1a2e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent-blue: #00d4ff;
    --accent-yellow: #ffd700;
    --accent-red: #ff4757;
    --accent-green: #00e676;
    --accent-orange: #ff8c00;
    --accent-pink: #ff6b9d;
    --gradient-primary: linear-gradient(135deg, #00d4ff, #7c3aed);
    --gradient-warm: linear-gradient(135deg, #ff8c00, #ff4757);
    --gradient-cool: linear-gradient(135deg, #00e676, #00d4ff);
    --font-display: 'Bebas Neue', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-heading: 'Space Grotesk', sans-serif;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.3s ease;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

.nav-cta {
    background: var(--gradient-warm) !important;
    color: white !important;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 700 !important;
    font-size: 0.85rem !important;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    flex-direction: column;
    gap: 16px;
    z-index: 999;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-menu a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-menu.active {
    display: flex;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .nav-toggle {
        display: flex;
    }
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: var(--gradient-warm);
    color: white;
    box-shadow: 0 4px 20px rgba(255, 71, 87, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 71, 87, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    border-color: var(--accent-blue);
    color: var(--accent-blue);
}

.btn-small {
    padding: 10px 20px;
    font-size: 0.85rem;
    background: var(--gradient-warm);
    color: white;
    border-radius: 6px;
}

.btn-small:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 71, 87, 0.3);
}

.btn-give-up {
    background: transparent;
    color: var(--accent-yellow);
    border: 2px solid var(--accent-yellow);
    padding: 12px 24px;
    font-size: 0.9rem;
}

.btn-give-up:hover {
    background: var(--accent-yellow);
    color: var(--bg-dark);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 120px 24px 80px;
}

/* Video background */
.hero-video-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.hero-video-bg video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.18;
    filter: grayscale(30%) contrast(1.1);
}

.hero-video-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 15, 0.6) 0%,
        rgba(10, 10, 15, 0.4) 50%,
        rgba(10, 10, 15, 0.85) 100%
    );
}

.hero-bg-letters {
    position: absolute;
    inset: 0;
    opacity: 0.03;
    font-family: var(--font-display);
    font-size: 2rem;
    line-height: 1.2;
    color: var(--accent-blue);
    overflow: hidden;
    pointer-events: none;
    word-break: break-all;
    z-index: 1;
}

.hero-content {
    text-align: center;
    position: relative;
    z-index: 2;
    max-width: 900px;
}

.hero-pre {
    font-family: var(--font-heading);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 4px;
    color: var(--accent-blue);
    margin-bottom: 20px;
    text-transform: uppercase;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 10vw, 8rem);
    line-height: 0.95;
    letter-spacing: 2px;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-shadow: 0 4px 30px rgba(0,0,0,0.5);
}

.hero-difficult {
    background: var(--gradient-warm);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.2em;
    display: inline-block;
    transform: rotate(-3deg);
    text-shadow: none;
    filter: drop-shadow(0 4px 20px rgba(255, 140, 0, 0.4));
}

.hero-tagline {
    font-family: var(--font-heading);
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--text-secondary);
    margin-bottom: 12px;
    font-style: italic;
}

.hero-sub {
    font-size: 1rem;
    color: var(--accent-yellow);
    font-weight: 600;
    margin-bottom: 40px;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.8rem;
    animation: bounce 2s infinite;
    z-index: 2;
}

.scroll-arrow {
    width: 2px;
    height: 30px;
    background: linear-gradient(to bottom, var(--accent-blue), transparent);
}

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

/* ============================================
   SECTION STYLES
   ============================================ */

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   PUZZLE SECTION
   ============================================ */

.puzzle-section {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0d0d1a 100%);
}

.puzzle-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.4fr;
    gap: 40px;
    align-items: start;
}

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

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

.puzzle-timer {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    padding: 16px 24px;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 215, 0, 0.2);
}

.timer-icon {
    font-size: 1.5rem;
}

.timer-value {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--accent-yellow);
    line-height: 1;
    transition: color 0.3s;
}

.timer-value.urgent {
    color: var(--accent-red);
    animation: pulse 0.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.timer-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.puzzle-hint {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.puzzle-word-display {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px 20px;
    border: 1px solid rgba(0, 212, 255, 0.15);
}

.puzzle-word-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px;
}

.puzzle-word-blanks {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.word-blank {
    width: 28px;
    height: 28px;
    border-bottom: 2px solid var(--accent-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--accent-blue);
}

.puzzle-grid-container {
    position: relative;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: var(--shadow-glow);
}

.puzzle-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 3px;
    user-select: none;
}

.puzzle-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: clamp(1rem, 2.2vw, 1.5rem);
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s ease;
    position: relative;
    border: 1px solid rgba(255,255,255,0.04);
}

.puzzle-cell:hover {
    background: rgba(0, 212, 255, 0.1);
    color: var(--text-primary);
}

.puzzle-cell.selected {
    background: rgba(0, 212, 255, 0.2);
    color: var(--accent-blue);
    box-shadow: inset 0 0 0 1px var(--accent-blue);
}

.puzzle-cell.revealed {
    background: rgba(0, 230, 118, 0.25) !important;
    color: var(--accent-green) !important;
    box-shadow: inset 0 0 0 1px var(--accent-green) !important;
    font-weight: 700;
    animation: revealPop 0.3s ease forwards;
}

@keyframes revealPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.2); }
    100% { transform: scale(1); }
}

.puzzle-overlay {
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 15, 0.96);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 32px;
}

.puzzle-overlay.active {
    display: flex;
}

.overlay-content {
    text-align: center;
    width: 100%;
}

.overlay-content h3 {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--accent-yellow);
}

.overlay-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.6;
}

.email-form {
    display: flex;
    gap: 12px;
    max-width: 420px;
    margin: 0 auto;
    flex-wrap: wrap;
    justify-content: center;
}

.email-form input {
    flex: 1;
    min-width: 200px;
    padding: 14px 20px;
    border-radius: 8px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.email-form input:focus {
    border-color: var(--accent-blue);
}

.email-form .btn {
    white-space: nowrap;
}

.overlay-privacy {
    font-size: 0.8rem !important;
    color: var(--text-secondary) !important;
    margin-top: 12px !important;
    margin-bottom: 0 !important;
}

.puzzle-success {
    position: absolute;
    inset: 0;
    background: rgba(10, 10, 15, 0.96);
    backdrop-filter: blur(12px);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
}

.success-content {
    text-align: center;
}

.success-content h3 {
    font-family: var(--font-display);
    font-size: 1.8rem;
    margin-bottom: 12px;
}

.revealed-word {
    font-family: var(--font-display);
    font-size: 3.5rem;
    color: var(--accent-green);
    margin-bottom: 16px;
    letter-spacing: 4px;
}

.success-tagline {
    color: var(--accent-yellow);
    font-weight: 600;
    margin-bottom: 24px !important;
}

.btn-amazon {
    display: inline-block;
    margin-top: 12px;
}

/* ============================================
   HOW IT WORKS
   ============================================ */

.how-it-works {
    padding: 100px 0;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.step {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.step:hover {
    border-color: rgba(0, 212, 255, 0.2);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.step-number {
    font-family: var(--font-display);
    font-size: 3rem;
    color: var(--accent-blue);
    opacity: 0.5;
    margin-bottom: 16px;
}

.step h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.step p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   EDITIONS / BOOK CATALOGUE
   ============================================ */

.editions {
    padding: 100px 0;
    background: linear-gradient(180deg, #0d0d1a 0%, var(--bg-dark) 100%);
}

.editions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}

.book-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.book-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    border-color: rgba(255, 215, 0, 0.2);
}

.book-cover {
    position: relative;
    aspect-ratio: 0.75;
    overflow: hidden;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.book-card:hover .book-cover img {
    transform: scale(1.05);
}

.book-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--accent-green);
    color: #000;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.5px;
}

.book-badge--soon {
    background: var(--accent-yellow);
}

.book-cover--placeholder {
    background: linear-gradient(135deg, var(--accent, #3498db), rgba(0,0,0,0.3));
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-content {
    text-align: center;
    padding: 20px;
}

.placeholder-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 12px;
}

.placeholder-content h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    color: white;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.book-info {
    padding: 18px;
}

.book-info h3 {
    font-family: var(--font-heading);
    font-size: 1rem;
    margin-bottom: 4px;
}

.book-puzzles {
    color: var(--text-secondary);
    font-size: 0.82rem;
    margin-bottom: 12px;
}

/* ============================================
   ABOUT SECTION
   ============================================ */

.about {
    padding: 100px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: start;
}

@media (max-width: 900px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

.about-text {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-text em {
    color: var(--accent-yellow);
    font-style: italic;
}

.about-social {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.about-social p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.social-link {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
}

.social-link:hover {
    text-decoration: underline;
}

/* Author photo stack */
.about-author-visual {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.author-photo-stack {
    position: relative;
    height: 420px;
}

.author-photo-main {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 70%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    background: #1a1a1a;
}

.author-photo-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
    filter: contrast(1.05);
}

.author-photo-accent {
    position: absolute;
    top: 0;
    right: 0;
    width: 55%;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 2px solid rgba(255, 215, 0, 0.2);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    background: #1a1a1a;
}

.author-photo-accent img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
    filter: contrast(1.05);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.stat {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 20px 12px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--accent-yellow);
    display: block;
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 500;
}

/* ============================================
   REVIEWS
   ============================================ */

.reviews {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-dark) 0%, #0d0d1a 100%);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}

.review-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.review-stars {
    color: var(--accent-yellow);
    font-size: 1.2rem;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 1.05rem;
    color: var(--text-primary);
    line-height: 1.7;
    margin-bottom: 16px;
    font-style: italic;
}

.review-author {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ============================================
   NEWSLETTER
   ============================================ */

.newsletter {
    padding: 100px 0;
}

.newsletter-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.newsletter-text {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 32px;
}

.newsletter-form {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 16px;
}

.newsletter-form input {
    flex: 1;
    min-width: 240px;
    padding: 16px 24px;
    border-radius: 8px;
    border: 2px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

.newsletter-form input:focus {
    border-color: var(--accent-blue);
}

.newsletter-count {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 2rem;
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.footer-url {
    color: var(--accent-blue) !important;
    font-weight: 500;
}

/* ZUP LABS footer */
.footer-zuplabs {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-zuplabs-label {
    font-size: 0.75rem !important;
    color: var(--text-secondary) !important;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 10px !important;
}

.zuplabs-link {
    display: inline-block;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.zuplabs-link:hover {
    opacity: 1;
}

.zuplabs-logo {
    height: 36px;
    width: auto;
    filter: invert(1) brightness(0.8);
}

.footer-links h4,
.footer-social h4 {
    font-family: var(--font-heading);
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-links a,
.footer-social a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 8px;
    transition: color 0.3s;
}

.footer-links a:hover,
.footer-social a:hover {
    color: var(--accent-blue);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.footer-bottom p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 600px) {
    .hero {
        padding: 100px 16px 60px;
    }

    .hero-title {
        font-size: 3rem;
    }

    .puzzle-grid-container {
        padding: 10px;
    }

    .puzzle-cell {
        font-size: 0.7rem;
    }

    .editions-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .steps-grid {
        grid-template-columns: 1fr;
    }

    .reviews-grid {
        grid-template-columns: 1fr;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .author-photo-stack {
        height: 320px;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 400px) {
    .editions-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   UTILITY
   ============================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}