/* =========================
   Root Variables — Bold & Colorful
   ========================= */
:root {
    /* Colors */
    --color-primary: #6C3CE9;
    --color-primary-dark: #4A1FB8;
    --color-secondary: #FF3C8E;
    --color-accent: #A8FF3E;
    --color-warm: #F5A623;
    --color-bg: #FFFCF7;
    --color-surface: #FFFFFF;
    --color-text: #1A1A2E;
    --color-text-secondary: #6B6B80;
    --color-border: #E8E4F0;
    --color-white: #FFFFFF;

    /* Typography */
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Transitions */
    --transition-speed: 0.4s;
    --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    line-height: 1.2;
    font-weight: 700;
}

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

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

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

.btn {
    display: inline-block;
    padding: 0.875rem 2.25rem;
    border: 2px solid transparent;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-body);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-speed) var(--transition-ease);
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(108, 60, 233, 0.35);
}

.section-label {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

/* =========================
   Header & Navigation
   ========================= */
#header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: transparent;
    z-index: 1000;
    transition: background-color var(--transition-speed) var(--transition-ease),
                box-shadow var(--transition-speed) var(--transition-ease);
}

#header.scrolled {
    background-color: var(--color-bg);
    box-shadow: 0 2px 20px rgba(26, 26, 46, 0.08);
}

.navbar {
    padding: 1.25rem 0;
}

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

.logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

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

.nav-link {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
    padding: 0.5rem 1rem;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 1rem;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width var(--transition-speed) var(--transition-ease);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: calc(100% - 2rem);
}

.nav-link:hover {
    color: var(--color-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

/* =========================
   Hero Section
   ========================= */
.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    padding: var(--spacing-xl) var(--spacing-md);
    padding-top: calc(var(--spacing-xl) + 70px);
    background-color: var(--color-bg);
    position: relative;
    overflow: visible;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.hero-text {
    position: relative;
    z-index: 2;
}

.hero-greeting {
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.hero-name {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.05;
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.15s forwards;
}

.hero-role {
    font-family: var(--font-display);
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.3s forwards;
}

.hero-desc {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 480px;
    margin-bottom: var(--spacing-md);
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.45s forwards;
}

.hover-word {
    display: inline;
    padding: 2px 0;
    border-radius: 0;
    transition: background-color 0.15s ease, color 0.15s ease;
    cursor: default;
}

.hover-word.highlighted {
    background-color: rgba(108, 60, 233, 0.18);
    color: var(--color-text);
}

[data-theme="dark"] .hover-word.highlighted {
    background-color: rgba(155, 122, 255, 0.35);
    color: #FFFFFF;
}

/* Underline variant for Tools/Skills/Education */
.about-detail-item .hover-word {
    transition: text-decoration-color 0.15s ease, color 0.15s ease;
    text-decoration: underline 2px transparent;
    text-underline-offset: 3px;
}

.about-detail-item .hover-word.highlighted {
    background-color: transparent;
    text-decoration-color: rgba(108, 60, 233, 0.35);
    color: var(--color-text);
}

[data-theme="dark"] .about-detail-item .hover-word.highlighted {
    background-color: transparent;
    text-decoration-color: rgba(155, 122, 255, 0.45);
    color: #FFFFFF;
}

.hero .btn {
    opacity: 0;
    animation: fadeInUp 0.8s ease 0.6s forwards;
}

/* Decorative gradient blob */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    margin-top: 30px;
}

.blob {
    position: absolute;
    will-change: transform, border-radius;
    transition: border-radius 0.6s ease;
}

.blob-primary {
    width: 420px;
    height: 420px;
    border-radius: 40% 60% 55% 45% / 55% 40% 60% 45%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary), var(--color-warm));
    filter: blur(55px) hue-rotate(0deg);
    opacity: 0.45;
    animation: fadeIn 1.2s ease 0.3s forwards;
}

.blob-secondary {
    width: 280px;
    height: 280px;
    border-radius: 55% 45% 60% 40% / 40% 55% 45% 60%;
    background: linear-gradient(225deg, var(--color-accent), var(--color-primary));
    filter: blur(45px) hue-rotate(0deg);
    opacity: 0.3;
    top: 20%;
    right: 10%;
}

/* =========================
   Work / Project Grid
   ========================= */
.work {
    padding: var(--spacing-xl) var(--spacing-md);
    padding-bottom: var(--spacing-lg);
}

.art-gallery {
    padding-top: calc(var(--spacing-xl) + 70px);
}

.work .section-label {
    margin-bottom: var(--spacing-md);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.project-card {
    background: #F5F3F7;
    border-radius: 16px;
    overflow: hidden;
    border: none;
    transition: transform var(--transition-speed) var(--transition-ease),
                box-shadow var(--transition-speed) var(--transition-ease);
}

.project-card a {
    display: block;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
}

.card-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    background: #EDEAF1;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s var(--transition-ease);
}

.project-card:hover .card-image img {
    transform: scale(1.04);
}

.card-info {
    padding: 1.5rem;
}

.card-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.card-info p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    display: inline-block;
    padding: 4px 14px;
    background: #E8E4F0;
    color: #4A4A5A;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-body);
    letter-spacing: 0.02em;
}

/* =========================
   Filter Bar
   ========================= */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    border: 2px solid var(--color-border);
    border-radius: 50px;
    background: transparent;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.filter-btn.active {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

.sub-filter-bar {
    display: none;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: -0.75rem;
    margin-bottom: var(--spacing-md);
}

.sub-filter-bar.visible {
    display: flex;
}

.sub-filter-btn {
    padding: 0.375rem 1rem;
    border: 1.5px solid var(--color-border);
    border-radius: 50px;
    background: transparent;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.sub-filter-btn:hover {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
}

.sub-filter-btn.active {
    background-color: var(--color-secondary);
    border-color: var(--color-secondary);
    color: var(--color-white);
}

.project-card.hidden {
    display: none;
}

/* Art Grid (masonry-style) */
.art-grid {
    columns: 4 240px;
    column-gap: var(--spacing-sm);
}

.art-item {
    break-inside: avoid;
    margin-bottom: var(--spacing-sm);
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.art-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.art-item img {
    width: 100%;
    height: auto;
    display: block;
}

.art-item.hidden {
    display: none;
}

@media (max-width: 768px) {
    .art-grid {
        columns: 2 150px;
    }
}

/* =========================
   Lightbox
   ========================= */
.lightbox-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
}

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

.lightbox-overlay img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: 8px;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
    background: #fff;
}

.lightbox-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    padding: 0.5rem;
    z-index: 10;
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease;
    z-index: 10;
}

.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }

.lightbox-counter {
    position: absolute;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    font-family: var(--font-body);
    letter-spacing: 1px;
}

/* =========================
   About Section (Brief)
   ========================= */
.about-brief {
    padding: var(--spacing-lg) var(--spacing-md);
    padding-bottom: var(--spacing-xl);
}

.about-brief .container {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.about-photo-wrapper {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.about-photo-circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
}

.about-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 12%;
    transform: scale(1.7);
    transform-origin: center 18%;
}

.about-text h2 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.about-text > p {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
}

.about-details {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    margin-bottom: var(--spacing-md);
}

.about-detail-item h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-primary);
    margin-bottom: 0.35rem;
}

.about-detail-item p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin: 0;
}

.about-detail-full {
    grid-column: 1 / -1;
}

@media (max-width: 480px) {
    .about-details {
        grid-template-columns: 1fr;
    }
}

.about-links {
    display: flex;
    gap: var(--spacing-sm);
}

.about-links a {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--color-text);
    text-decoration: none;
    padding: 0.5rem 1.25rem;
    border: 1.5px solid var(--color-border);
    border-radius: 999px;
    transition: background-color var(--transition-speed) var(--transition-ease),
                color var(--transition-speed) var(--transition-ease),
                border-color var(--transition-speed) var(--transition-ease);
}

.about-links a:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
}

/* =========================
   Footer
   ========================= */
.footer {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-md);
}

.footer .container {
    position: relative;
    max-width: none;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 var(--spacing-md);
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 0;
    flex-wrap: wrap;
}

a.footer-name {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-speed) var(--transition-ease);
}

a.footer-name:hover {
    color: var(--color-accent);
}

.footer-left .separator {
    color: rgba(255, 255, 255, 0.4);
    margin: 0 var(--spacing-sm);
}

.footer-left a {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
    font-size: 0.875rem;
    transition: color var(--transition-speed) var(--transition-ease);
}

.footer-left a:hover {
    color: var(--color-accent);
}

.footer .theme-toggle {
    position: absolute;
    right: var(--spacing-md);
    border-color: rgba(255, 255, 255, 0.3);
    color: rgba(255, 255, 255, 0.8);
}

.footer .theme-toggle:hover {
    border-color: rgba(255, 255, 255, 0.6);
    color: var(--color-white);
    background-color: rgba(255, 255, 255, 0.1);
}

/* =========================
   Animations
   ========================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes blobFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(15px, -20px) rotate(5deg); }
    66% { transform: translate(-10px, 10px) rotate(-3deg); }
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* =========================
   Responsive Design
   ========================= */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1.2fr 1fr;
        gap: var(--spacing-md);
    }

    .project-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding-top: calc(var(--spacing-lg) + 70px);
        padding-bottom: var(--spacing-lg);
    }

    .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero .btn {
        margin: 0 auto;
    }

    .hero-visual {
        min-height: 200px;
        order: -1;
    }

    .blob-primary {
        width: 250px;
        height: 250px;
    }

    .blob-secondary {
        width: 150px;
        height: 150px;
    }

    .hero-name {
        font-size: clamp(2.5rem, 10vw, 3.5rem);
    }

    /* Navigation */
    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--spacing-md);
        background-color: var(--color-primary);
        transform: translateX(100%);
        transition: transform 0.4s var(--transition-ease);
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-menu .nav-link {
        color: var(--color-white);
        font-size: 1.5rem;
        font-family: var(--font-display);
        font-weight: 700;
    }

    .nav-menu .nav-link::after {
        background-color: var(--color-accent);
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active span {
        background-color: var(--color-white);
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }

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

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }

    /* Project grid */
    .project-grid {
        grid-template-columns: 1fr;
    }

    /* About */
    .about-brief .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .about-photo-wrapper {
        margin: 0 auto;
    }

    .about-photo-circle {
        width: 160px;
        height: 160px;
    }

    .about-text p {
        margin-left: auto;
        margin-right: auto;
    }

    .about-links {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.25rem;
    }

    .card-info h3 {
        font-size: 1.125rem;
    }

    .card-info {
        padding: 1.25rem;
    }
}

/* =========================
   Theme Toggle Button
   ========================= */
.theme-toggle {
    background: none;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
    padding: 0;
    flex-shrink: 0;
    transition: all 0.3s ease;
    cursor: pointer;
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* =========================
   Dark Mode
   ========================= */
body,
.project-card,
.card-image,
.tag,
.filter-btn,
.sub-filter-btn,
.about-links a,
#header,
.footer {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] {
    --color-primary: #9B7AFF;
    --color-primary-dark: #7B5CE0;
    --color-secondary: #FF6AAF;
    --color-accent: #A8FF3E;
    --color-warm: #F5A623;
    --color-bg: #121218;
    --color-surface: #1C1C26;
    --color-text: #E8E6F0;
    --color-text-secondary: #9A98A8;
    --color-border: #2E2C3A;
    --color-white: #FFFFFF;
}

[data-theme="dark"] .project-card {
    background: var(--color-surface);
}

[data-theme="dark"] .card-image {
    background: #252530;
}

[data-theme="dark"] .tag {
    background: #2E2C3A;
    color: #B8B6C4;
}

[data-theme="dark"] #header.scrolled {
    background-color: var(--color-bg);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .project-card:hover {
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .btn-primary:hover {
    box-shadow: 0 8px 24px rgba(155, 122, 255, 0.35);
}


[data-theme="dark"] .footer {
    background-color: #0D0D14;
}

@media (max-width: 768px) {
    [data-theme="dark"] .nav-menu {
        background-color: #1C1C26;
    }

    [data-theme="dark"] .nav-menu .nav-link {
        color: var(--color-text);
    }

    .footer .container {
        flex-wrap: wrap;
    }

    .footer-left {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.25rem 0;
    }
}