/* main_demo4.css - Demo 4: Playful Creative */

/* --------------------
   RESET & BASIC SETUP
   -------------------- */

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

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

body {
    font-family: var(--font-body);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    transition: background-color 0.5s ease, color 0.5s ease;
    overflow-x: hidden; /* Prevent horizontal scroll */
    position: relative;
}

/* --------------------
   CSS VARIABLES
   -------------------- */

:root {
    /* Light Theme (Default) */
    --color-background: #ffffff;
    --color-text-primary: #333333;
    --color-text-secondary: #666666;
    --color-accent: #FF6B6B; /* Coral */
    --color-accent-secondary: #4ECDC4; /* Teal */
    --color-accent-tertiary: #FFE66D; /* Yellow */
    --color-accent-quaternary: #7A5FFF; /* Purple */
    --color-card-bg: #ffffff;
    --color-card-shadow: rgba(0, 0, 0, 0.08);
    --color-border: #eeeeee;
    --color-header-bg: rgba(255, 255, 255, 0.95);
    
    /* Fonts */
    --font-heading: 'Poppins', sans-serif; /* Playful, rounded */
    --font-body: 'Nunito', sans-serif;     /* Friendly, readable */
    
    /* Spacing */
    --spacing-unit: 1rem; /* 16px */
    --container-width: 1200px;
    --header-height: 80px;
    
    /* Effects */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 50%;
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --transition-speed: 0.3s;
}

body[data-theme='dark'] {
    --color-background: #222831;
    --color-text-primary: #EEEEEE;
    --color-text-secondary: #AAAAAA;
    --color-accent: #FF6B6B; /* Same coral */
    --color-accent-secondary: #4ECDC4; /* Same teal */
    --color-accent-tertiary: #FFE66D; /* Same yellow */
    --color-accent-quaternary: #7A5FFF; /* Same purple */
    --color-card-bg: #393E46;
    --color-card-shadow: rgba(0, 0, 0, 0.2);
    --color-border: #393E46;
    --color-header-bg: rgba(34, 40, 49, 0.95);
    --box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* --------------------
   PLAYFUL BACKGROUND
   -------------------- */

.playful-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
}

.shape-1 {
    width: 300px;
    height: 300px;
    background-color: var(--color-accent);
    top: -100px;
    left: -100px;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background-color: var(--color-accent-secondary);
    bottom: -50px;
    right: -50px;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background-color: var(--color-accent-tertiary);
    top: 30%;
    right: 10%;
}

.shape-4 {
    width: 250px;
    height: 250px;
    background-color: var(--color-accent-quaternary);
    bottom: 20%;
    left: 5%;
}

.shape-5 {
    width: 180px;
    height: 180px;
    background-color: var(--color-accent);
    top: 60%;
    right: 30%;
}

/* --------------------
   UTILITIES
   -------------------- */

.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
    position: relative;
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-speed) ease, transform var(--transition-speed) ease;
}

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

/* --------------------
   HEADER & NAVIGATION
   -------------------- */

.site-header-d4 {
    background-color: var(--color-header-bg);
    padding: calc(var(--spacing-unit) * 1.2) 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.site-header-d4 .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-d4 {
    font-family: var(--font-heading);
    font-size: calc(var(--spacing-unit) * 1.8);
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: 1px;
    position: relative;
    z-index: 2;
    transition: color var(--transition-speed) ease;
}

.main-nav-d4 ul {
    list-style: none;
    display: flex;
}

.main-nav-d4 li {
    margin-left: calc(var(--spacing-unit) * 2);
}

.main-nav-d4 a {
    font-family: var(--font-body);
    font-size: var(--spacing-unit);
    color: var(--color-text-primary);
    font-weight: 600;
    padding: 0.5rem 0;
    position: relative;
    transition: color var(--transition-speed) ease;
}

.main-nav-d4 a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--color-accent);
    transition: width var(--transition-speed) ease;
    border-radius: 3px;
}

.main-nav-d4 a:hover, .main-nav-d4 a.active {
    color: var(--color-accent);
}

.main-nav-d4 a:hover::after, .main-nav-d4 a.active::after {
    width: 100%;
}

.menu-toggle-button-d4 {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 2;
}

.menu-toggle-button-d4 span {
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--color-text-primary);
    margin: 6px 0;
    border-radius: 3px;
    transition: transform var(--transition-speed) ease, opacity var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

.menu-toggle-button-d4.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.menu-toggle-button-d4.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle-button-d4.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.mobile-nav-d4 {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--color-header-bg);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.05);
    z-index: 999;
    padding: var(--spacing-unit) 0;
    transition: background-color var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.mobile-nav-d4 ul {
    list-style: none;
    text-align: center;
}

.mobile-nav-d4 li {
    margin-bottom: var(--spacing-unit);
}

.mobile-nav-d4 a {
    font-family: var(--font-body);
    font-size: calc(var(--spacing-unit) * 1.2);
    color: var(--color-text-primary);
    padding: 0.5rem;
    display: block;
    transition: color var(--transition-speed) ease;
}

.mobile-nav-d4 a:hover, .mobile-nav-d4 a.active {
    color: var(--color-accent);
}

/* --------------------
   HERO SECTION
   -------------------- */

.hero-section-d4 {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    position: relative;
    overflow: hidden;
}

.hero-section-d4 .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

.hero-content-d4 {
    flex: 1 1 500px;
    padding-right: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.hero-image-d4 {
    flex: 1 1 400px;
    position: relative;
    max-width: 500px;
}

.hero-image-d4 img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.hero-image-d4:hover img {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

.hero-title-d4 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 7vw, 4rem);
    font-weight: 800;
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    line-height: 1.1;
    position: relative;
}

.hero-title-d4::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 80px;
    height: 5px;
    background-color: var(--color-accent);
    border-radius: 5px;
}

.hero-subtitle-d4 {
    font-family: var(--font-body);
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 3);
    max-width: 600px;
    font-weight: 500;
}

.hero-cta-d4 {
    margin-top: calc(var(--spacing-unit) * 2);
}

.cta-button-d4 {
    display: inline-block;
    background-color: var(--color-accent);
    color: #FFFFFF;
    font-family: var(--font-body);
    font-size: calc(var(--spacing-unit) * 1.1);
    font-weight: 700;
    padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 2);
    border-radius: 50px;
    transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

.cta-button-d4:hover {
    background-color: var(--color-accent-secondary);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(78, 205, 196, 0.4);
    color: #FFFFFF;
}

.cta-button-cv {
    display: inline-block;
    background-color: var(--color-accent-secondary);
    color: #FFFFFF;
    font-family: var(--font-body);
    font-size: calc(var(--spacing-unit) * 1.1);
    font-weight: 700;
    padding: calc(var(--spacing-unit) * 0.8) calc(var(--spacing-unit) * 2);
    border-radius: 50px;
    transition: background-color var(--transition-speed) ease, transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    position: relative;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

.cta-button-cv:hover {
    background-color: var(--color-accent);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(78, 205, 196, 0.4);
    color: #FFFFFF;
}

/* --------------------
   CONTENT SECTIONS
   -------------------- */

.content-section-d4 {
    padding: calc(var(--spacing-unit) * 6) 0;
    position: relative;
}

.section-title-d4 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 4);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title-d4::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 5px;
    background-color: var(--color-accent);
    border-radius: 5px;
}

/* About Section */
.about-section-d4 {
    position: relative;
}

.about-content-d4 {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: calc(var(--spacing-unit) * 4);
}

.bio-text-d4 {
    flex: 1 1 100%;
    max-width: 800px;
    margin: 0 auto;
}

.bio-text-d4 p {
    font-size: calc(var(--spacing-unit) * 1.1);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-unit);
    line-height: 1.8;
}

/* Experience Section */
.experience-section-d4 {
    position: relative;
}

.experience-list-d4 {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 2);
    max-width: 800px;
    margin: 0 auto;
}

.experience-item-d4 {
    display: flex;
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-md);
    padding: calc(var(--spacing-unit) * 2);
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.experience-item-d4:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.experience-icon-d4 {
    margin-right: calc(var(--spacing-unit) * 2);
    background-color: var(--color-accent-tertiary);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.experience-icon-d4 svg {
    width: 24px;
    height: 24px;
    color: var(--color-text-primary);
}

.experience-content-d4 {
    flex: 1;
}

.experience-content-d4 h3 {
    font-family: var(--font-heading);
    font-size: calc(var(--spacing-unit) * 1.3);
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    font-weight: 600;
}

.experience-content-d4 .experience-dates-d4 {
    font-size: calc(var(--spacing-unit) * 0.9);
    color: var(--color-accent);
    margin-bottom: calc(var(--spacing-unit) * 1);
    font-weight: 600;
}

/* Skills Section */
.skills-section-d4 {
    position: relative;
}

.subsection-title-d4 {
    font-family: var(--font-heading);
    font-size: calc(var(--spacing-unit) * 1.5);
    color: var(--color-text-primary);
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    text-align: center;
    font-weight: 600;
}

.skills-list-d4, .languages-list-d4 {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 1);
    max-width: 800px;
    margin: 0 auto;
}

.skill-tag-d4, .language-tag-d4 {
    background-color: var(--color-card-bg);
    color: var(--color-text-primary);
    padding: calc(var(--spacing-unit) * 0.7) calc(var(--spacing-unit) * 1.5);
    font-size: calc(var(--spacing-unit) * 0.9);
    font-weight: 600;
    border-radius: 50px;
    box-shadow: var(--box-shadow);
    transition: background-color var(--transition-speed), color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed);
}

.skill-tag-d4 {
    background-color: var(--color-accent-quaternary);
    color: #FFFFFF;
}

.language-tag-d4 {
    background-color: var(--color-accent-tertiary);
    color: var(--color-text-primary);
}

.skill-tag-d4:hover, .language-tag-d4:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.skill-tag-d4:hover {
    background-color: var(--color-accent);
}

.language-tag-d4:hover {
    background-color: var(--color-accent-secondary);
    color: #FFFFFF;
}

/* Projects Section */
.projects-section-d4 {
    position: relative;
}

.filter-buttons-d4 {
    text-align: center;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.filter-btn-d4 {
    background: none;
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
    padding: calc(var(--spacing-unit) * 0.6) calc(var(--spacing-unit) * 1.2);
    margin: 0 calc(var(--spacing-unit) * 0.3);
    cursor: pointer;
    transition: background-color var(--transition-speed), color var(--transition-speed), transform var(--transition-speed), box-shadow var(--transition-speed);
    font-family: var(--font-body);
    font-weight: 600;
    border-radius: 50px;
}

.filter-btn-d4.active, .filter-btn-d4:hover {
    background-color: var(--color-accent);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

.project-gallery-d4 {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
}

.project-item-d4 {
    position: relative;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    background-color: var(--color-card-bg);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.project-item-d4:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.project-image-container-d4 {
    position: relative;
    overflow: hidden;
    height: 200px; /* Fixed height for consistency */
}

.project-image-container-d4 img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-speed) ease;
}

.project-item-d4:hover .project-image-container-d4 img {
    transform: scale(1.1);
}

.project-info-d4 {
    padding: calc(var(--spacing-unit) * 1.5);
}

.project-info-d4 h3 {
    font-family: var(--font-heading);
    font-size: calc(var(--spacing-unit) * 1.2);
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    font-weight: 600;
}

.project-info-d4 p {
    font-size: calc(var(--spacing-unit) * 0.9);
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 1);
}



/* Contact Section */
.contact-section-d4 {
    position: relative;
}

.contact-intro-d4 {
    text-align: center;
    font-size: calc(var(--spacing-unit) * 1.1);
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 3);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.contact-details-d4 {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.contact-item-d4 {
    display: flex;
    align-items: center;
    background-color: var(--color-card-bg);
    padding: calc(var(--spacing-unit) * 1.5);
    border-radius: var(--border-radius-md);
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.contact-item-d4:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.contact-icon-d4 {
    margin-right: calc(var(--spacing-unit) * 1);
    background-color: var(--color-accent-tertiary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-icon-d4 svg {
    width: 20px;
    height: 20px;
    color: var(--color-text-primary);
}

.contact-item-d4 p {
    font-size: calc(var(--spacing-unit) * 1);
    color: var(--color-text-primary);
    margin: 0;
}

.social-media-links-d4 {
    text-align: center;
}

.social-link-d4 {
    display: inline-block;
    margin: 0 calc(var(--spacing-unit) * 0.8);
    background-color: var(--color-card-bg);
    padding: calc(var(--spacing-unit) * 0.8);
    border-radius: 50%;
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease, background-color var(--transition-speed) ease;
}

.social-link-d4 img {
    width: 24px;
    height: 24px;
    filter: brightness(0) saturate(100%) invert(0%) sepia(7%) saturate(98%) hue-rotate(346deg) brightness(89%) contrast(86%);
    transition: filter var(--transition-speed) ease;
}

body[data-theme='dark'] .social-link-d4 img {
    filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(0%) hue-rotate(93deg) brightness(103%) contrast(103%);
}

.social-link-d4:hover {
    transform: translateY(-5px) scale(1.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    background-color: var(--color-accent);
}

.social-link-d4:hover img {
    filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(0%) hue-rotate(93deg) brightness(103%) contrast(103%);
}

/* --------------------
   FOOTER
   -------------------- */

.site-footer-d4 {
    background-color: var(--color-card-bg);
    color: var(--color-text-secondary);
    padding: calc(var(--spacing-unit) * 3) 0;
    text-align: center;
    box-shadow: 0 -5px 20px rgba(0, 0, 0, 0.05);
    margin-top: calc(var(--spacing-unit) * 4);
}

.site-footer-d4 p {
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    font-size: calc(var(--spacing-unit) * 0.9);
}

.site-footer-d4 .attribution {
    font-size: calc(var(--spacing-unit) * 0.8);
    opacity: 0.7;
}

/* --------------------
   ANIMATIONS (GSAP will handle complex ones)
   -------------------- */

/* Basic fade-in for elements animated by GSAP to prevent flash of unstyled content if JS is slow */
/* .animate-on-load, .animate-on-scroll {
    opacity: 0;
} */

/* --------------------
   RESPONSIVE DESIGN
   -------------------- */

@media (max-width: 992px) {
    .hero-title-d4 {
        font-size: 3rem;
    }
    
    .hero-subtitle-d4 {
        font-size: 1.2rem;
    }
    
    .hero-content-d4 {
        padding-right: 0;
    }
}

@media (max-width: 768px) {
    .main-nav-d4 {
        display: none; /* Hide desktop nav */
    }

    .menu-toggle-button-d4 {
        display: block; /* Show hamburger */
    }

    .mobile-nav-d4.active {
        display: block;
    }

    .hero-title-d4 {
        font-size: 2.5rem;
    }

    .hero-subtitle-d4 {
        font-size: 1.1rem;
    }
    
    .hero-section-d4 .container {
        flex-direction: column;
    }
    
    .hero-content-d4, .hero-image-d4 {
        flex: 1 1 100%;
    }
    
    .hero-image-d4 {
        margin: 0 auto;
    }

    .experience-item-d4 {
        flex-direction: column;
    }
    
    .experience-icon-d4 {
        margin-right: 0;
        margin-bottom: var(--spacing-unit);
    }

    .contact-details-d4 {
        flex-direction: column;
        align-items: center;
    }
    
    .contact-item-d4 {
        width: 100%;
        max-width: 350px;
    }
}

@media (max-width: 576px) {
    .hero-title-d4 {
        font-size: 2rem;
    }
    
    .section-title-d4 {
        font-size: 1.8rem;
    }
    
    .filter-buttons-d4 {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    .filter-btn-d4 {
        margin: 0;
        flex: 1 1 calc(50% - 10px);
    }
}