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

:root {
    /* Natural Palette - Simplified with Inkwell & Fresh Water blues */
    --veranda-blue: #0C5E8A;
    --veranda-blue-dark: #094A6E;
    --veranda-blue-light: #5D9CBD;
    --sky-cloud: #5D9CBD;
    --sky-cloud-light: #8BBDD8;
    --lychee: #F5F4F0;
    --lychee-dark: #C1BFA8;
    --melon: #8BBDD8;
    --melon-light: #B3D4E8;
    --cupid-pink: #5D9CBD;
    --cupid-pink-dark: #0C5E8A;
    --cupid-pink-light: #8BBDD8;
    --text-dark: #1F1F1F;
    --text-medium: #323130;
    --text-light: #605E5C;
    --background-white: #FFFFFF;
    --background-gray-light: #F3F2F1;
    --background-gray: #FAF9F8;
    --border-gray: #EDEBE9;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(12, 94, 138, 0.3);
    --shadow-accent: rgba(93, 156, 189, 0.2);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

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

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

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

/* ===================================
   Navigation Bar
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--background-white);
    box-shadow: 0 2px 10px var(--shadow-color);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--veranda-blue);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 3px 0;
    transition: var(--transition-fast);
}

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

.nav-link {
    text-decoration: none;
    color: var(--text-medium);
    font-weight: 500;
    padding: 0.5rem 1rem;
    transition: var(--transition-fast);
    border-radius: 4px;
}

.nav-link:hover {
    color: var(--veranda-blue);
    background-color: var(--background-gray-light);
}

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

.hero {
    margin-top: 60px;
    padding: var(--spacing-md) 0;
    background: linear-gradient(135deg, #0C5E8A 0%, #5D9CBD 100%);
    color: var(--background-white);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 1200px;
    width: 100%;
    animation: fadeInUp 1s ease;
}

.hero-left {
    flex: 0 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-right {
    flex: 1;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.hero-profile-image {
    display: flex;
    justify-content: center;
}

.profile-img {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 6px solid rgba(255, 255, 255, 0.3);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition-normal);
}

.profile-img:hover {
    transform: scale(1.05);
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0;
}

.hero-tagline {
    font-size: 1.5rem;
    margin: 0;
    opacity: 0.95;
}

.hero-description {
    font-size: 1rem;
    margin: 0;
    max-width: 600px;
    opacity: 0.9;
    line-height: 1.6;
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    font-weight: 600;
    border-radius: 50px;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                box-shadow 0.4s cubic-bezier(0.4, 0, 0.2, 1),
                background 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.3px;
    max-width: fit-content;
}

.btn-primary {
    background: linear-gradient(135deg, #0C5E8A 0%, #5D9CBD 50%, #8BBDD8 100%);
    color: var(--background-white);
    box-shadow: 0 4px 15px rgba(12, 94, 138, 0.3);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.1) 100%);
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #094A6E 0%, #0C5E8A 50%, #5D9CBD 100%);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(12, 94, 138, 0.5), 
                0 0 30px rgba(93, 156, 189, 0.4);
}

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

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-dark);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #0C5E8A, #5D9CBD, #8BBDD8);
    border-radius: 2px;
}

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

.about {
    background-color: var(--lychee);
}

.about-content {
    max-width: 0 auto;
    margin: 0 auto;
    text-align: center;
}

.about-text {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--text-medium);
}

/* ===================================
   Popular Talks Section
   =================================== */

.talks {
    background-color: var(--background-white);
}

.talks-table-wrapper {
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.talks-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background-color: var(--background-white);
}

.talks-table thead {
    background: linear-gradient(135deg, #0C5E8A 0%, #5D9CBD 100%);
    color: var(--background-white);
}

.talks-table th {
    padding: 1.25rem 1.5rem;
    text-align: left;
    font-weight: 600;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.talks-table tbody tr {
    border-bottom: 1px solid var(--border-gray);
    transition: var(--transition-fast);
}

.talks-table tbody tr:hover {
    background-color: var(--background-gray);
    transform: scale(1.01);
}

.talks-table tbody tr:last-child {
    border-bottom: none;
}

.talks-table td {
    padding: 1.25rem 1.5rem;
    color: var(--text-medium);
    font-size: 0.95rem;
}

.talks-table td:first-child {
    font-weight: 600;
    color: var(--text-dark);
}

.link-btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    margin: 0.25rem;
    background: linear-gradient(135deg, #0C5E8A 0%, #5D9CBD 100%);
    color: var(--background-white);
    text-decoration: none;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.link-btn:hover {
    background: linear-gradient(135deg, #094A6E 0%, #0C5E8A 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-hover);
}

.link-btn i {
    margin-right: 0.375rem;
}

.link-placeholder {
    color: var(--text-light);
    font-style: italic;
    font-size: 0.875rem;
}

/* ===================================
   Projects Section
   =================================== */

.projects {
    background-color: var(--lychee);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.project-card {
    background-color: var(--background-white);
    border-radius: 12px;
    padding: var(--spacing-md);
    box-shadow: 0 4px 15px var(--shadow-color);
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 30px var(--shadow-hover);
}

.project-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #0C5E8A, #5D9CBD, #8BBDD8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-sm);
}

.project-icon i {
    font-size: 1.75rem;
    color: var(--background-white);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.project-description {
    color: var(--text-light);
    margin-bottom: var(--spacing-sm);
    flex-grow: 1;
    line-height: 1.6;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--veranda-blue);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
}

.project-link:hover {
    color: var(--veranda-blue-dark);
    gap: 0.75rem;
}

.project-link i {
    font-size: 1.1rem;
}

.project-link-placeholder {
    color: var(--text-light);
    cursor: not-allowed;
}

/* ===================================
   Blogs Section
   =================================== */

.blogs {
    background-color: var(--background-white);
}

.blogs-list {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.blog-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--background-gray);
    border-radius: 8px;
    border-left: 4px solid var(--veranda-blue);
    transition: var(--transition-fast);
}

.blog-item:hover {
    background-color: var(--background-gray-light);
    transform: translateX(8px);
    box-shadow: 0 4px 15px var(--shadow-color);
}

.blog-item i {
    font-size: 1.5rem;
    color: var(--veranda-blue);
    margin-top: 0.25rem;
}

.blog-content {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.blog-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.05rem;
    transition: var(--transition-fast);
}

.blog-link:not(.blog-link-placeholder):hover {
    color: var(--veranda-blue);
}

.blog-link-placeholder {
    color: var(--text-light);
}

.coming-soon-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: var(--cupid-pink);
    color: var(--background-white);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

/* ===================================
   Gallery Section
   =================================== */

.gallery {
    background-color: var(--lychee);
}

.gallery-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-top: -2rem;
    margin-bottom: var(--spacing-md);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    grid-auto-rows: 250px;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    cursor: pointer;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    transition: var(--transition-normal);
}

.gallery-item-large {
    grid-row: span 2;
}

.gallery-item-wide {
    grid-column: span 2;
}

.gallery-item:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 30px var(--shadow-color);
    z-index: 10;
}

.gallery-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: var(--spacing-sm);
    text-align: center;
    color: var(--text-light);
}

.gallery-placeholder i {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--veranda-blue);
    opacity: 0.5;
}

.gallery-placeholder p {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-dark);
}

.image-instruction {
    font-size: 0.75rem;
    color: var(--text-light);
    font-family: monospace;
    background-color: rgba(255, 255, 255, 0.8);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.gallery-img {
    display: none;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Lightbox Styles */
.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.95);
    overflow: auto;
}

.lightbox-content {
    display: block;
    max-width: 90%;
    max-height: 90%;
    margin: auto;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: zoom 0.3s ease;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 40px;
    color: var(--background-white);
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    z-index: 10000;
    transition: var(--transition-fast);
}

.lightbox-close:hover {
    color: var(--cupid-pink);
}

.lightbox-caption {
    text-align: center;
    color: var(--background-white);
    padding: var(--spacing-sm);
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
}

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

.contact {
    background-color: var(--background-white);
    text-align: center;
}

.contact-text {
    font-size: 1.2rem;
    color: var(--text-medium);
    margin-bottom: var(--spacing-md);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, #0C5E8A 0%, #5D9CBD 100%);
    color: var(--background-white);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.05rem;
    transition: var(--transition-normal);
}

.contact-link:hover {
    background: linear-gradient(135deg, #094A6E 0%, #0C5E8A 100%);
    transform: translateY(-4px);
    box-shadow: 0 8px 20px var(--shadow-hover);
}

.contact-link i {
    font-size: 1.5rem;
}

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

.footer {
    background-color: var(--text-dark);
    color: var(--background-white);
    text-align: center;
    padding: var(--spacing-md) 0;
}

.footer p {
    margin: 0.5rem 0;
    opacity: 0.8;
}

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

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

@keyframes zoom {
    from {
        transform: translate(-50%, -50%) scale(0);
    }
    to {
        transform: translate(-50%, -50%) scale(1);
    }
}

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

@media (max-width: 968px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        grid-auto-rows: 200px;
    }
    
    .gallery-item-large,
    .gallery-item-wide {
        grid-row: span 1;
        grid-column: span 1;
    }
}

@media (max-width: 768px) {
    /* Navigation */
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--background-white);
        flex-direction: column;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: var(--transition-normal);
        box-shadow: 0 4px 10px var(--shadow-color);
    }
    
    .nav-menu.active {
        max-height: 500px;
    }
    
    .nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* Hero */
    .hero {
        min-height: 450px;
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .hero-right {
        text-align: center;
        align-items: center;
    }
    
    .profile-img {
        width: 200px;
        height: 200px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.5rem;
    }
    
    .hero-tagline {
        font-size: 1.25rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    /* Sections */
    section {
        padding: var(--spacing-md) 0;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    /* Talks Table */
    .talks-table {
        font-size: 0.875rem;
    }
    
    .talks-table thead {
        display: none;
    }
    
    .talks-table tbody tr {
        display: block;
        margin-bottom: var(--spacing-sm);
        border: 1px solid var(--border-gray);
        border-radius: 8px;
    }
    
    .talks-table td {
        display: block;
        text-align: right;
        padding: 0.75rem var(--spacing-sm);
        border-bottom: 1px solid var(--border-gray);
    }
    
    .talks-table td:last-child {
        border-bottom: none;
    }
    
    .talks-table td::before {
        content: attr(data-label);
        float: left;
        font-weight: 600;
        color: var(--veranda-blue);
    }
    
    /* Projects Grid */
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    /* Gallery */
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        grid-auto-rows: 150px;
    }
    
    /* Contact */
    .contact-links {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-link {
        width: 100%;
        max-width: 350px;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .profile-img {
        width: 160px;
        height: 160px;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .link-btn {
        padding: 0.375rem 0.75rem;
        font-size: 0.8rem;
        margin: 0.125rem;
    }
    
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-auto-rows: 120px;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .nav-toggle,
    .footer {
        display: none;
    }
    
    section {
        page-break-inside: avoid;
    }
}