/* =========================================
   Global Styles & Variables
   ========================================= */

:root {
    /* Color Palette */
    --primary-blue: #041f4a;
    --secondary-teal: #48a9c0;
    --accent-green: #7bdcb5;
    --accent-coral: #ff6b6b;
    --accent-purple: #9b51e0;
    
    /* Neutral Colors */
    --white: #ffffff;
    --off-white: #f8f9fa;
    --light-gray: #e9ecef;
    --medium-gray: #6c757d;
    --dark-gray: #343a40;
    --black: #212529;
    
    /* Section-specific colors */
    --cases-bg: #f0f7ff;
    --sessions-bg: #fff9f0;
    --about-bg: #f5fff5;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-accent: 'Playfair Display', Georgia, serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 1rem;
    --spacing-2xl: 4rem;
    
    /* Transitions */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.2);
}

/* =========================================
   Reset & Base Styles
   ========================================= */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark-gray);
    background-color: var(--white);
    overflow-x: hidden;
}

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

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

button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

img {
    max-width: 100%;
    height: auto;
}

/* =========================================
   Header Styles
   ========================================= */

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-base);
}

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

/* Header Left - Logo */
.header-left {
    flex: 0 0 auto;
}

.logo {
    display: flex;
    align-items: center;
}

.site-title {
    font-family: var(--font-accent);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin: 0;
    transition: var(--transition-base);
}

.site-title:hover {
    color: var(--secondary-teal);
}

/* Header Center - Navigation */
.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.main-nav {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.main-nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--dark-gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: var(--spacing-sm) 0;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-teal);
    transition: var(--transition-base);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

/* Header Right - Language & Contact */
.header-right {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.lang-btn {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--medium-gray);
    padding: var(--spacing-xs) var(--spacing-sm);
    transition: var(--transition-base);
}

.lang-btn:hover,
.lang-btn.active {
    color: var(--primary-blue);
}

.lang-separator {
    color: var(--light-gray);
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--secondary-teal);
    color: var(--white);
    transition: var(--transition-base);
}

.contact-icon:hover {
    background: var(--primary-blue);
    transform: scale(1.1);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    width: 30px;
    height: 30px;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background: var(--dark-gray);
    transition: var(--transition-base);
}

/* =========================================
   Hero Section
   ========================================= */

.hero-section {
    padding-top: calc(80px + var(--spacing-2xl));
    padding-bottom: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--off-white) 0%, var(--white) 100%);
}

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

.hero-title {
    font-family: var(--font-accent);
    font-size: clamp(2.0rem, 5.0vw, 3.0rem);
    font-weight: 400;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-xl);
    line-height: 1.2;
}

.hero-statements {
    margin-bottom: var(--spacing-2xl);
}

.statement {
    font-size: 1.25rem;
    color: var(--medium-gray);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

/* Experience Grid */
.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.exp-item {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
}

.exp-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.exp-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-teal);
    margin-bottom: var(--spacing-sm);
}

.exp-label {
    font-size: 0.9rem;
    color: var(--dark-gray);
    line-height: 1.4;
}

/* Statistics Container */
.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    background: var(--primary-blue);
    padding: var(--spacing-xl);
    border-radius: 16px;
    color: var(--white);
}

.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-green);
    margin-bottom: var(--spacing-xs);
}

.stat-item p {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* =========================================
   Section Styles
   ========================================= */

section {
    padding: var(--spacing-2xl) 0;
}

.section-title {
    font-family: var(--font-accent);
    font-size: 2.5rem;
    color: var(--primary-blue);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-subtitle {
    text-align: center;
    font-size: 1.25rem;
    color: var(--medium-gray);
    font-style: italic;
    margin-top: calc(-1 * var(--spacing-lg));
    margin-bottom: var(--spacing-xl);
}

/* =========================================
   Cases Section
   ========================================= */

.cases-section {
    background: var(--cases-bg);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.case-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    min-height: 200px;
    display: flex;
    flex-direction: column;
}

.case-card:hover {
    box-shadow: var(--shadow-lg);
}

.case-header {
    padding: var(--spacing-lg) var(--spacing-lg) 0 var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    cursor: pointer;
    position: relative;
}

.case-header h3 {
    font-size: 1.5rem;
    color: var(--primary-blue);
    margin-bottom: 0;
    flex: 1;
    padding-right: var(--spacing-lg);
}

.case-description {
    padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    cursor: pointer;
}

.case-tags {
    display: block;
    font-size: 0.85rem;
    color: var(--medium-gray);
    font-style: italic;
    line-height: 1.5;
}

.expand-btn {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-gray);
    border-radius: 50%;
    transition: var(--transition-base);
}

.expand-btn:hover {
    background: var(--secondary-teal);
    color: var(--white);
}

.expand-btn i {
    transition: var(--transition-base);
}

.case-card.expanded .expand-btn i {
    transform: rotate(180deg);
}

.case-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-out;
    padding: 0 var(--spacing-lg);
}

.case-card.expanded .case-content {
    max-height: 2000px;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.case-content h4 {
    font-size: 1.1rem;
    color: var(--primary-blue);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.case-content p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.case-content ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.case-content li {
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
}

/* Case Card Link Styles */
.case-card-link {
    text-decoration: none;
    display: block;
    color: inherit;
}

.case-card-link:hover .case-card {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.view-case-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--light-gray);
    border-radius: 50%;
    transition: var(--transition-base);
    flex-shrink: 0;
}

.case-card-link:hover .view-case-icon {
    background: var(--secondary-teal);
    color: var(--white);
    transform: translateX(4px);
}

.view-case-icon i {
    font-size: 1.1rem;
    transition: var(--transition-base);
}

/* =========================================
   Case Detail Pages
   ========================================= */

.case-detail-section {
    padding: calc(var(--spacing-2xl) + 60px) 0 var(--spacing-2xl);
    min-height: 80vh;
}

.back-button-wrapper {
    margin-bottom: var(--spacing-xl);
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--light-gray);
    border-radius: 8px;
    color: var(--dark-gray);
    font-weight: 500;
    transition: var(--transition-base);
}

.back-button:hover {
    background: var(--secondary-teal);
    color: var(--white);
    transform: translateX(-4px);
}

.back-button i {
    font-size: 0.9rem;
}

.case-detail-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--light-gray);
}

.case-detail-title {
    font-family: var(--font-accent);
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.case-detail-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag-item {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--cases-bg);
    color: var(--medium-gray);
    border-radius: 20px;
    font-size: 0.85rem;
    font-style: italic;
}

.case-detail-content {
    max-width: 900px;
}

.case-intro {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--off-white);
    border-left: 4px solid var(--secondary-teal);
    border-radius: 4px;
}

.case-section {
    margin-bottom: var(--spacing-xl);
}

.case-section h2 {
    font-size: 1.75rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.case-section p {
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
}

.case-section ul {
    margin-left: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.case-section li {
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
    color: var(--dark-gray);
}

.case-section li strong {
    color: var(--primary-blue);
}

.case-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--light-gray);
}

.case-nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--light-gray);
    border-radius: 8px;
    color: var(--dark-gray);
    font-weight: 500;
    transition: var(--transition-base);
    flex: 1;
    max-width: 300px;
}

.case-nav-link.prev {
    justify-content: flex-start;
}

.case-nav-link.next {
    justify-content: flex-end;
    margin-left: auto;
}

.case-nav-link:hover {
    background: var(--secondary-teal);
    color: var(--white);
    transform: scale(1.02);
}

/* =========================================
   Footer
   ========================================= */

.site-footer {
    background: var(--primary-blue);
    color: var(--white);
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-top: auto;
}

.site-footer p {
    margin: 0;
    opacity: 0.9;
}

/* =========================================
   Sessions Section
   ========================================= */

.sessions-section {
    background: var(--sessions-bg);
}

/* QR Code Section (inside Innovative Sessions) */
.session-content .qr-section {
    text-align: center;
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
    background: var(--off-white);
    border-radius: 8px;
}

.session-content .qr-code {
    width: 150px;
    height: 150px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin: 0 auto var(--spacing-sm);
    display: block;
}

.session-content .qr-text {
    font-weight: 600;
    color: var(--primary-blue);
    font-style: italic;
    margin: 0;
}

/* Session Tagline */
.session-tagline {
    font-size: 1.2rem;
    font-style: italic;
    color: var(--accent-coral);
    text-align: center;
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

/* Session Tagline inside session cards (on main Sessions section) */
.session-description .session-tagline {
    color: var(--medium-gray);
    text-align: left;
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.session-card {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    min-height: 220px;
    display: flex;
    flex-direction: column;
}

.session-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.15);
}

.session-header {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
}

.session-header h3 {
    font-size: 1.3rem;
    color: var(--primary-blue);
}

.session-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease-out;
    padding: 0 var(--spacing-lg);
}

.session-card.expanded .session-content {
    max-height: 2000px;
    padding: 0 var(--spacing-lg) var(--spacing-lg);
}

.session-description {
    padding: var(--spacing-sm) var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

/* TRIZ Section Specific Styles */
.triz-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--off-white);
    border-radius: 8px;
}

.triz-section h4 {
    font-size: 1.5rem;
    color: var(--accent-coral);
    margin-bottom: var(--spacing-md);
}

.triz-tagline {
    font-size: 1.1rem;
    font-style: italic;
    color: var(--medium-gray);
    margin-bottom: var(--spacing-sm);
}

.triz-duration {
    font-size: 0.9rem;
    color: var(--medium-gray);
    margin-bottom: var(--spacing-lg);
}

.triz-example {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin-top: var(--spacing-lg);
}

.triz-example h5 {
    font-size: 1.2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.triz-example p {
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

/* TRIZ Diagram */
.triz-diagram {
    width: 100%;
    max-width: 600px;
    margin: var(--spacing-lg) auto;
    display: block;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

/* TRIZ Session Structure */
.triz-structure {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.triz-structure h5 {
    font-size: 1.3rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
}

.triz-steps {
    margin: var(--spacing-lg) 0;
}

.triz-step {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--off-white);
    border-radius: 8px;
    border-left: 4px solid var(--accent-coral);
}

.triz-step h6 {
    font-size: 1.1rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.triz-step p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.triz-step .example {
    font-style: italic;
    color: var(--medium-gray);
    background: var(--white);
    padding: var(--spacing-sm);
    border-radius: 4px;
    margin: var(--spacing-sm) 0;
}

.triz-step .purpose {
    font-weight: 500;
    color: var(--secondary-teal);
    margin-top: var(--spacing-sm);
}

.triz-step ul {
    margin: var(--spacing-sm) 0 var(--spacing-sm) var(--spacing-lg);
}

.triz-step li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.6;
}

.triz-result {
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, var(--accent-green) 0%, var(--secondary-teal) 100%);
    border-radius: 8px;
    color: var(--white);
}

.triz-result p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.triz-result strong {
    font-size: 1.1rem;
}

/* =========================================
   About Section
   ========================================= */

#about.about-section {
    background: var(--about-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
    max-width: 1200px;
    margin: 0 auto;
    margin-bottom: var(--spacing-2xl);
}

.about-image {
    position: sticky;
    top: 100px;
}

.about-image img {
    width: 100%;
    height: 340px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

.certifications {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.cert-title {
    font-size: 1.1rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
    text-align: center;
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--off-white);
}

.cert-list {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-md) var(--spacing-lg);
    align-items: baseline;
}

.cert-list dt {
    font-weight: 600;
    color: var(--primary-blue);
    font-size: 0.95rem;
    text-align: right;
    padding-right: var(--spacing-md);
    border-right: 2px solid var(--accent-coral);
}

.cert-list dd {
    margin: 0;
    color: var(--dark-gray);
    font-size: 0.9rem;
    line-height: 1.6;
    padding-left: var(--spacing-md);
}

.about-text {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.about-name {
    font-family: var(--font-accent);
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-lg);
}

.about-text .about-section {
    margin-bottom: var(--spacing-md);
}

.about-text .about-section:last-child {
    margin-bottom: 0;
}

.about-text .about-section h4 {
    font-size: 1.2rem;
    color: var(--secondary-teal);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.about-text .about-section p {
    line-height: 1.5;
    color: var(--dark-gray);
}

/* =========================================
   Contact Section
   ========================================= */

.contact-section {
    background: var(--primary-blue);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.contact-section .section-title {
    color: var(--white);
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-info p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
}

.contact-email {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.5rem;
    color: var(--accent-green);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50px;
    transition: var(--transition-base);
}

.contact-email:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

/* =========================================
   Footer
   ========================================= */

.site-footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: var(--spacing-xl) 0;
}

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

.footer-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-nav a {
    color: var(--white);
    opacity: 0.8;
    transition: var(--transition-base);
}

.footer-nav a:hover {
    opacity: 1;
    color: var(--accent-green);
}

.footer-copyright {
    opacity: 0.6;
    font-size: 0.9rem;
}

/* =========================================
   Animations
   ========================================= */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.animate-fade-in {
    animation: fadeIn 0.8s ease-out forwards;
}

.animate-slide-up {
    animation: slideUp 0.8s ease-out forwards;
    animation-delay: 0.2s;
    opacity: 0;
}

/* =========================================
   Responsive Design
   ========================================= */

/* Tablet Styles */
@media (max-width: 1024px) {
    .header-container {
        padding: var(--spacing-md);
    }
    
    .main-nav {
        gap: var(--spacing-lg);
    }
    
    .experience-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        position: static;
    }
}

/* Mobile Styles */
@media (max-width: 768px) {
    /* Header Mobile */
    .header-center {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: var(--shadow-md);
        transform: translateX(-100%);
        transition: var(--transition-base);
        padding: var(--spacing-lg);
    }
    
    .header-center.active {
        transform: translateX(0);
    }
    
    .main-nav {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .header-right {
        gap: var(--spacing-md);
    }
    
    .lang-switcher {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Hero Mobile */
    .hero-title {
        font-size: 2rem;
    }
    
    .statement {
        font-size: 1.1rem;
    }
    
    .experience-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
        padding: var(--spacing-lg);
    }
    
    /* Cases Mobile */
    .case-header h3 {
        font-size: 1.2rem;
    }
    
    /* Sessions Mobile */
    .sessions-grid {
        grid-template-columns: 1fr;
    }
    
    .qr-code {
        width: 120px;
        height: 120px;
    }
    
    .triz-diagram {
        max-width: 100%;
    }
    
    .triz-structure {
        padding: var(--spacing-md);
    }
    
    .triz-step {
        padding: var(--spacing-sm);
    }
    
    /* About Mobile */
    .about-text {
        padding: var(--spacing-lg);
    }
    
    .about-name {
        font-size: 1.5rem;
    }
    
    /* Contact Mobile */
    .contact-email {
        font-size: 1.1rem;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* Footer Mobile */
    .footer-nav {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
}

/* Print Styles */
@media print {
    .site-header,
    .site-footer,
    .mobile-menu-toggle,
    .lang-switcher,
    .contact-icon {
        display: none;
    }
    
    body {
        font-size: 12pt;
    }
    
    .case-content,
    .session-content {
        max-height: none !important;
        padding: var(--spacing-md) !important;
    }
}