/* ============================================
   CSS Variables — Design System
   ============================================ */
:root {
    --color-primary: #1a1a2e;
    --color-secondary: #16213e;
    --color-accent: #c9a961;
    --color-accent-light: #d4b883;
    --color-text: #2d2d2d;
    --color-text-light: #5f5f5f;
    --color-background: #faf9f6;
    --color-surface: #ffffff;
    --color-border: #e5e5e5;

    --font-display: 'Crimson Pro', Georgia, serif;
    --font-body: 'DM Sans', 'Segoe UI', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    --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);

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --glass-bg: rgba(255,255,255,0.12);
    --glass-border: rgba(255,255,255,0.18);
    --glass-blur: 14px;
}

/* Dark Theme */
[data-theme="dark"] {
    --color-primary: #c9a961;
    --color-secondary: #d4b883;
    --color-accent: #c9a961;
    --color-accent-light: #e0c592;
    --color-text: #e8e8e8;
    --color-text-light: #b0b0b0;
    --color-background: #0f0f1e;
    --color-surface: #1a1a2e;
    --color-border: #2d2d3d;
    --glass-bg: rgba(26,26,46,0.45);
    --glass-border: rgba(201,169,97,0.15);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1,h2,h3,h4,h5,h6 {
    font-family: var(--font-display);
    line-height: 1.2;
    font-weight: 600;
    color: var(--color-primary);
    transition: color var(--transition-normal);
}

a { text-decoration:none; color:inherit; transition:all var(--transition-fast); }
img { max-width:100%; height:auto; display:block; }
ul { list-style:none; }

.container { max-width:1200px; margin:0 auto; padding:0 var(--spacing-md); }

/* ============================================
   Glassmorphism Utility
   ============================================ */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
}

/* ============================================
   Theme Toggle
   ============================================ */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    color: var(--color-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}
.theme-toggle:hover { transform:scale(1.1) rotate(15deg); box-shadow:var(--shadow-lg); }

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 999;
    background: rgba(250,249,246,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}
[data-theme="dark"] .navbar { background: rgba(15,15,30,0.85); }
.navbar.scrolled { box-shadow: var(--shadow-md); }

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

.nav-logo { display:flex; align-items:center; gap:0.75rem; font-family:var(--font-display); font-size:1.4rem; font-weight:700; color:var(--color-primary); }
.logo-initial { width:42px; height:42px; display:flex; align-items:center; justify-content:center; background:var(--color-accent); color:white; border-radius:50%; font-size:1.2rem; }
.nav-menu { display:flex; gap:var(--spacing-md); align-items:center; }
.nav-link { font-weight:500; position:relative; padding:0.5rem 0; }
.nav-link::after { content:''; position:absolute; bottom:0; left:0; width:0; height:2px; background:var(--color-accent); transition:width var(--transition-normal); }
.nav-link:hover::after, .nav-link.active::after { width:100%; }

.nav-toggle { display:none; flex-direction:column; gap:5px; background:transparent; border:none; cursor:pointer; padding:5px; }
.nav-toggle span { width:25px; height:3px; background:var(--color-primary); border-radius:3px; transition:all var(--transition-normal); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
    background: var(--color-primary);
}
[data-theme="dark"] .hero { background: #0a0a18; }

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(201,169,97,0.18) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(26,26,46,0.3) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 100%, rgba(201,169,97,0.08) 0%, transparent 40%);
}

.hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

/* Floating glassmorphism elements */
.hero-floating {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
}

.float-el {
    position: absolute;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--color-accent);
    border-radius: var(--radius-lg);
    animation: floatGentle 6s ease-in-out infinite;
    will-change: transform;
}
.float-1 { top:18%; left:8%; animation-delay:0s; }
.float-2 { top:30%; right:12%; animation-delay:1.2s; }
.float-3 { bottom:30%; left:15%; animation-delay:2.4s; }
.float-4 { top:60%; right:6%; animation-delay:0.8s; }
.float-5 { bottom:18%; left:45%; animation-delay:1.8s; }

@keyframes floatGentle {
    0%,100% { transform:translateY(0) rotate(0deg); }
    50% { transform:translateY(-15px) rotate(5deg); }
}

/* Hero content grid */
.hero-content {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

/* Hero text */
.hero-text { color: #fff; }
.hero-label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
    opacity: 0;
}

.hero-title {
    margin-bottom: var(--spacing-sm);
    line-height: 1.05;
}
.title-line {
    display: block;
    font-size: clamp(2.8rem, 7vw, 5rem);
    font-weight: 700;
    color: #ffffff;
    opacity: 0;
}
.title-accent { color: var(--color-accent); }

.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.75);
    margin-bottom: var(--spacing-md);
    max-width: 540px;
    line-height: 1.7;
    opacity: 0;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    opacity: 0;
}

/* Hero visual / image */
.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-image-wrapper {
    position: relative;
    max-width: 380px;
    width: 100%;
}

.hero-image-frame {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
    z-index: 2;
}

.hero-image-frame img {
    width: 100%;
    height: auto;
    display: block;
}

.hero-image-glow {
    position: absolute;
    top: -30px; left: -30px; right: -30px; bottom: -30px;
    border-radius: var(--radius-xl);
    background: radial-gradient(ellipse, rgba(201,169,97,0.2) 0%, transparent 70%);
    z-index: 1;
    filter: blur(20px);
}

/* Hero floating stat cards */
.hero-stat {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1.2rem;
    z-index: 3;
    color: #fff;
    font-size: 0.85rem;
    opacity: 0;
}
.hero-stat strong { font-size: 1.6rem; font-family: var(--font-display); display:block; color:var(--color-accent); }
.hero-stat span { font-size: 0.78rem; opacity:0.8; }
.hero-stat-icon { font-size:1.4rem; color:var(--color-accent); }

#heroStat1 { bottom: 15%; left: -30px; }
.hero-stat-2 { top: 10%; right: -20px; }

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    color: rgba(255,255,255,0.5);
    font-size: 0.8rem;
    z-index: 2;
    letter-spacing: 1px;
    text-transform: uppercase;
    opacity: 0;
}
.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%,100% { opacity:0.3; height:40px; }
    50% { opacity:1; height:55px; }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 1.8rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-family: var(--font-body);
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    font-size: 0.95rem;
}
.btn-primary {
    background: var(--color-accent);
    color: white;
    box-shadow: var(--shadow-sm);
}
.btn-primary:hover {
    background: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}
.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
}
.btn-glass {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
}
.btn-glass:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}
.btn-small { padding:0.6rem 1.2rem; font-size:0.85rem; }
.btn-footer-cta { margin-top: 0.5rem; display: inline-flex; }

/* ============================================
   Section Styles
   ============================================ */
.section { padding: var(--spacing-xl) 0; position: relative; }
.section-header { text-align:center; margin-bottom:var(--spacing-lg); }
.section-label { display:inline-block; font-size:0.85rem; font-weight:500; letter-spacing:2px; text-transform:uppercase; color:var(--color-accent); margin-bottom:var(--spacing-sm); }
.section-title { font-size:clamp(2.2rem,5vw,3.5rem); margin-bottom:var(--spacing-sm); }
.section-description { font-size:1.1rem; color:var(--color-text-light); max-width:700px; margin:0 auto; }

/* ============================================
   About Section
   ============================================ */
.sobre { background: var(--color-surface); }

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

.text-block { margin-bottom: var(--spacing-md); }
.text-block h3 { font-size:1.6rem; margin-bottom:var(--spacing-sm); color:var(--color-accent); }
.text-block p { margin-bottom:var(--spacing-sm); line-height:1.8; text-align: justify; }

.education-list { display:flex; flex-direction:column; gap:var(--spacing-sm); }
.education-list li { display:flex; gap:var(--spacing-sm); align-items:flex-start; }
.education-list i { color:var(--color-accent); font-size:1.4rem; margin-top:0.2rem; flex-shrink:0; }
.education-list strong { display:block; font-family:var(--font-display); font-size:1.05rem; margin-bottom:0.2rem; }
.education-list span { color:var(--color-text-light); font-size:0.92rem; }

/* Stats */
.sobre-stats { display:flex; flex-direction:column; gap:var(--spacing-sm); }
.stat-card {
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%);
    color: white;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
    border: none;
}
.stat-card:hover { transform:translateY(-5px); }
.stat-card i { font-size:2.2rem; margin-bottom:var(--spacing-sm); opacity:0.9; }
.stat-number { font-size:2.8rem; font-weight:700; margin-bottom:0.2rem; color:white; }
.stat-card p { font-size:0.95rem; opacity:0.95; }

/* Expertise */
.expertise { margin-top: var(--spacing-lg); }
.expertise h3 { font-size:1.8rem; text-align:center; margin-bottom:var(--spacing-md); }
.expertise-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(220px,1fr)); gap:var(--spacing-md); }

.expertise-item {
    padding: var(--spacing-md);
    background: var(--color-background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
    text-align: center;
}
.expertise-item:hover { border-color:var(--color-accent); transform:translateY(-5px); box-shadow:var(--shadow-md); }
.expertise-item i { font-size:2.2rem; color:var(--color-accent); margin-bottom:var(--spacing-sm); }
.expertise-item h4 { font-size:1.15rem; margin-bottom:0.4rem; }
.expertise-item p { color:var(--color-text-light); font-size:0.9rem; }

/* ============================================
   Books Slider
   ============================================ */
.livros { background: var(--color-background); }

.books-slider-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.books-slider {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: var(--spacing-sm) 0;
    flex: 1;
}
.books-slider::-webkit-scrollbar { display:none; }

.book-card {
    flex: 0 0 calc(33.333% - 1.35rem);
    scroll-snap-align: start;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    cursor: pointer;
    border: 1px solid var(--color-border);
}
.book-card:hover { transform:translateY(-8px); box-shadow:var(--shadow-lg); border-color:var(--color-accent); }

.book-cover {
    position: relative;
    overflow: hidden;
    aspect-ratio: 3/4;
    background: linear-gradient(135deg, var(--color-secondary), var(--color-primary));
}
.book-cover img { width:100%; height:100%; object-fit:cover; transition:transform var(--transition-slow); }
.book-card:hover .book-cover img { transform:scale(1.05); }

.book-cover-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    color: var(--color-accent);
    padding: var(--spacing-md);
    text-align: center;
}
.book-cover-placeholder i { font-size: 3rem; opacity: 0.6; }
.book-cover-placeholder span { font-size: 0.9rem; opacity: 0.7; color: rgba(255,255,255,0.7); }

.book-overlay {
    position: absolute;
    inset: 0;
    background: rgba(26,26,46,0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}
.book-card:hover .book-overlay { opacity:1; }

.book-info { padding: 1.2rem; }
.book-info h3 { font-size:1.2rem; margin-bottom:0.3rem; }
.book-meta { color:var(--color-text-light); font-size:0.85rem; margin-bottom:0.6rem; }
.book-description { color:var(--color-text-light); line-height:1.6; margin-bottom:0.6rem; font-size:0.9rem; }
.book-link { display:inline-flex; align-items:center; gap:0.4rem; color:var(--color-accent); font-weight:500; font-size:0.9rem; transition:gap var(--transition-fast); }
.book-link:hover { gap:0.7rem; }

/* Slider arrows */
.slider-arrow {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    color: var(--color-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--transition-normal);
    flex-shrink: 0;
    box-shadow: var(--shadow-sm);
    z-index: 2;
}
.slider-arrow:hover { background:var(--color-accent); color:white; border-color:var(--color-accent); transform:scale(1.1); }

/* Slider dots */
.slider-dots {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: var(--spacing-sm);
}
.slider-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-border);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    padding: 0;
}
.slider-dot.active { background:var(--color-accent); width:28px; border-radius:5px; }

/* ============================================
   Articles / Blog
   ============================================ */
.artigos { background: var(--color-surface); }
.articles-container { display:grid; gap:var(--spacing-md); margin-bottom:var(--spacing-md); }

.article-card {
    padding: var(--spacing-md);
    background: var(--color-background);
    border-left: 4px solid var(--color-accent);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}
.article-card:hover { transform:translateX(10px); box-shadow:var(--shadow-md); }

.article-meta { display:flex; gap:var(--spacing-sm); margin-bottom:var(--spacing-sm); font-size:0.85rem; align-items:center; }
.article-category { padding:0.2rem 0.65rem; background:var(--color-accent); color:white; border-radius:20px; font-weight:500; font-size:0.8rem; }
.article-date { color:var(--color-text-light); }
.article-title { font-size:1.35rem; margin-bottom:var(--spacing-sm); }
.article-title a { color:var(--color-primary); transition:color var(--transition-fast); }
.article-title a:hover { color:var(--color-accent); }
.article-excerpt { color:var(--color-text-light); line-height:1.7; margin-bottom:var(--spacing-sm); }
.article-link { display:inline-flex; align-items:center; gap:0.4rem; color:var(--color-accent); font-weight:500; transition:gap var(--transition-fast); }
.article-link:hover { gap:0.7rem; }
.load-more { text-align:center; margin-top:var(--spacing-md); }

/* ============================================
   Contact Section
   ============================================ */
.contato { background: var(--color-background); }

.contact-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-md);
}
.contact-card {
    padding: var(--spacing-md) 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
    color: var(--color-text);
    cursor: pointer;
}
.contact-card:hover { border-color:var(--color-accent); transform:translateY(-8px); box-shadow:var(--shadow-lg); }
.contact-card-icon {
    width: 65px; height: 65px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-light));
    border-radius: 50%;
    color: white; font-size: 1.6rem;
    transition: transform var(--transition-normal);
}
.contact-card:hover .contact-card-icon { transform:scale(1.1); }
.contact-card h3 { font-size:1.15rem; color:var(--color-primary); }
.contact-card p { color:var(--color-text-light); font-size:0.9rem; }
.contact-card-action {
    display: inline-flex; align-items: center; gap: 0.4rem;
    color: var(--color-accent); font-weight: 500; font-size: 0.85rem;
    margin-top: auto;
    transition: gap var(--transition-fast);
}
.contact-card:hover .contact-card-action { gap:0.7rem; }

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-lg) 0 var(--spacing-md);
}
[data-theme="dark"] .footer { background: #0a0a18; }

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}
.footer-brand h3 { font-size:1.6rem; color:var(--color-accent); margin-bottom:var(--spacing-sm); }
.footer-brand p { color:rgba(255,255,255,0.8); }
.footer-links h4 { font-size:1.15rem; color:var(--color-accent); margin-bottom:var(--spacing-sm); }
.footer-links ul { display:flex; flex-direction:column; gap:0.4rem; }
.footer-links a { color:rgba(255,255,255,0.8); transition:color var(--transition-fast); }
.footer-links a:hover { color:var(--color-accent); }
.footer-newsletter h4 { font-size:1.15rem; color:var(--color-accent); margin-bottom:var(--spacing-sm); }
.footer-newsletter p { color:rgba(255,255,255,0.8); margin-bottom:var(--spacing-sm); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-sm);
    text-align: center;
}
.footer-bottom p { color:rgba(255,255,255,0.6); font-size:0.9rem; margin-bottom:0.2rem; }

/* ============================================
   Animations
   ============================================ */
@keyframes fadeInUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
@keyframes fadeInLeft { from{opacity:0;transform:translateX(50px)} to{opacity:1;transform:translateX(0)} }

/* AOS */
[data-aos] { opacity:0; transition-property:opacity,transform; transition-duration:0.7s; }
[data-aos].aos-animate { opacity:1; }
[data-aos="fade-up"] { transform:translateY(30px); }
[data-aos="fade-up"].aos-animate { transform:translateY(0); }
[data-aos="fade-right"] { transform:translateX(-30px); }
[data-aos="fade-right"].aos-animate { transform:translateX(0); }
[data-aos="fade-left"] { transform:translateX(30px); }
[data-aos="fade-left"].aos-animate { transform:translateX(0); }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-content { grid-template-columns:1fr; gap:var(--spacing-md); text-align:center; }
    .hero-text { order:2; }
    .hero-visual { order:1; }
    .hero-subtitle { margin-left:auto; margin-right:auto; }
    .hero-cta { justify-content:center; }
    .hero-stat { display:none; }
    .sobre-content { grid-template-columns:1fr; }
    .contact-cards-grid { grid-template-columns:repeat(2,1fr); }
    .footer-content { grid-template-columns:1fr; }
    .float-el { display:none; }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px; left: 0; right: 0;
        background: var(--color-surface);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    .nav-menu.active { transform:translateY(0); opacity:1; visibility:visible; }
    .nav-toggle { display:flex; }
    .nav-toggle.active span:nth-child(1) { transform:rotate(45deg) translate(5px,5px); }
    .nav-toggle.active span:nth-child(2) { opacity:0; }
    .nav-toggle.active span:nth-child(3) { transform:rotate(-45deg) translate(7px,-6px); }

    .hero-title .title-line { font-size: 2.4rem; }
    .section-title { font-size:1.8rem; }

    .book-card { flex: 0 0 calc(100% - 1rem); }
    .slider-arrow { display:none; }
    .books-slider { padding: 0 var(--spacing-sm); }

    .expertise-grid { grid-template-columns:1fr; }
    .contact-cards-grid { grid-template-columns:1fr; }
    .hero-cta { flex-direction:column; }
    .btn { width:100%; justify-content:center; }
}

@media (max-width: 480px) {
    :root { --spacing-xl:3rem; --spacing-lg:2rem; }
    .theme-toggle { width:42px; height:42px; font-size:1rem; }
}

/* ============================================
   Notification toast (injected by JS)
   ============================================ */
@keyframes slideInRight { from{transform:translateX(400px);opacity:0} to{transform:translateX(0);opacity:1} }
@keyframes slideOutRight { from{transform:translateX(0);opacity:1} to{transform:translateX(400px);opacity:0} }