/* =====================================================
   CSS RESET & BASE
===================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
}

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

ul {
    list-style: none;
}

/* =====================================================
   COLOR PALETTE OPTIONS
   Uncomment ONE block below to change accent colors.
   Default = Palette 1 (Electric Blue)
===================================================== */
:root {
    /* ---- PALETTE 1: Electric Blue (default) ---- */
    --accent: #3b82f6;
    --accent-2: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);

    /* ---- PALETTE 2: Neon Green ----
  --accent: #10b981;
  --accent-2: #06b6d4;
  --accent-gradient: linear-gradient(135deg, #10b981, #06b6d4);
  */

    /* ---- PALETTE 3: Sunset Orange ----
  --accent: #f97316;
  --accent-2: #ec4899;
  --accent-gradient: linear-gradient(135deg, #f97316, #ec4899);
  */

    /* ---- PALETTE 4: Royal Purple ----
  --accent: #8b5cf6;
  --accent-2: #ec4899;
  --accent-gradient: linear-gradient(135deg, #8b5cf6, #ec4899);
  */

    /* ---- PALETTE 5: Crimson Red ----
  --accent: #ef4444;
  --accent-2: #f59e0b;
  --accent-gradient: linear-gradient(135deg, #ef4444, #f59e0b);
  */

    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Inter', sans-serif;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
    --transition: 0.25s ease;
    --container-width: 1200px;
}

/* =====================================================
   LIGHT / DARK THEME VARIABLES
===================================================== */
:root,
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f6f8fb;
    --text-primary: #0f172a;
    --text-secondary: #55607a;
    --border-color: #e5e9f0;
    --card-bg: #ffffff;
    --card-shadow: rgba(15, 23, 42, 0.07);
    --nav-bg: rgba(255, 255, 255, 0.85);
}

[data-theme="dark"] {
    --bg-primary: #0b1120;
    --bg-secondary: #131b2e;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #263148;
    --card-bg: #161f36;
    --card-shadow: rgba(0, 0, 0, 0.35);
    --nav-bg: rgba(11, 17, 32, 0.85);
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background var(--transition), color var(--transition);
    line-height: 1.6;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* =====================================================
   BUTTONS
===================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 26px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition);
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px var(--card-shadow);
}

.btn-outline {
    border: 2px solid var(--accent);
    color: var(--accent);
}

.btn-outline:hover {
    background: var(--accent);
    color: #fff;
}

.btn-sm {
    padding: 9px 18px;
    font-size: 0.85rem;
}

/* =====================================================
   NAVBAR
===================================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 999;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.navbar-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.3rem;
}

.logo-dot {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition);
}

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

.nav-resume-btn {
    color: #fff !important;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--text-primary);
    transition: background var(--transition);
}

.theme-toggle:hover {
    background: var(--bg-secondary);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.icon-moon {
    display: none;
}

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

[data-theme="dark"] .icon-moon {
    display: block;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 30px;
}

.hamburger span {
    height: 2px;
    width: 100%;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition);
}

/* =====================================================
   HERO
===================================================== */
.hero {
    padding: 80px 0;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    align-items: center;
    gap: 50px;
}

.hero-greeting {
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 10px;
}

.hero-name {
    font-size: 2.8rem;
    margin-bottom: 8px;
}

.hero-title {
    font-size: 1.6rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 18px;
}

.hero-tagline {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 520px;
    margin-bottom: 30px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 34px;
    flex-wrap: wrap;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border-radius: 50%;
    color: var(--text-primary);
    transition: all var(--transition);
}

.social-links a:hover {
    background: var(--accent);
    color: #fff;
    transform: translateY(-3px);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

.hero-photo img {
    width: 100%;
    max-width: 380px;
    aspect-ratio: 1/1;
    object-fit: cover;
    border-radius: 50%;
    margin: 0 auto;
    border: 6px solid var(--bg-secondary);
    box-shadow: 0 20px 50px var(--card-shadow);
}

/* =====================================================
   SECTIONS (general)
===================================================== */
.section {
    padding: 90px 0;
}

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

.section-title {
    font-size: 2.2rem;
    text-align: center;
    margin-bottom: 10px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 50px;
}

.about-content {
    max-width: 800px;
    margin: 0 auto 50px;
    text-align: center;
}

.about-content p {
    margin-bottom: 16px;
    color: var(--text-secondary);
}

/* Skills */
.skills-wrapper {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.skill-group h3 {
    margin-bottom: 14px;
    font-size: 1.1rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    padding: 8px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* =====================================================
   PROJECT CARDS / GRID
===================================================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px var(--card-shadow);
}

.project-card img {
    width: 100%;
    aspect-ratio: 3/2;
    object-fit: cover;
}

.project-card-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    flex: 1;
}

.project-category-badge {
    align-self: flex-start;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    background: var(--accent-gradient);
    color: #fff;
}

/* Platform badges (Unity Projects cards) */
.platform-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-self: flex-start;
}

.platform-badge {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 20px;
    color: #fff;
    white-space: nowrap;
    line-height: 1.4;
}

.platform-badge.platform-android {
    background: rgba(16, 185, 129, 0.85);
}

.platform-badge.platform-webgl {
    background: rgba(59, 130, 246, 0.85);
}

.platform-badge.platform-pc {
    background: rgba(139, 92, 246, 0.85);
}

.project-card-body h3 {
    font-size: 1.15rem;
}

.project-card-body p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    flex: 1;
}

.project-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 6px;
}

.project-tech-tags span {
    font-size: 0.72rem;
    padding: 3px 10px;
    background: var(--bg-secondary);
    border-radius: 20px;
    color: var(--text-secondary);
}

.project-card-link {
    margin-top: 10px;
    font-weight: 600;
    color: var(--accent);
    font-size: 0.9rem;
}

.center-btn {
    text-align: center;
    margin-top: 40px;
}

/* =====================================================
   FILTER BAR
===================================================== */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 50px;
}

.filter-btn {
    padding: 10px 20px;
    border-radius: 30px;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition);
}

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

.filter-btn.active {
    background: var(--accent-gradient);
    color: #fff;
    border-color: transparent;
}

.no-results {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px 0;
}

/* =====================================================
   PAGE HEADER (projects.html)
===================================================== */
.page-header {
    padding: 60px 0 30px;
    text-align: center;
}

.page-header h1 {
    font-size: 2.4rem;
    margin-bottom: 10px;
}

.page-header p {
    color: var(--text-secondary);
}

/* =====================================================
   TIMELINE (Experience / Education)
===================================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-bottom: 40px;
    padding-left: 30px;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -30px;
    top: 4px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: 3px solid var(--bg-primary);
}

.timeline-date {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.85rem;
}

.timeline-content h3 {
    margin-top: 6px;
    font-size: 1.2rem;
}

.timeline-content h4 {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.92rem;
}

/* =====================================================
   CONTACT
===================================================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    max-width: 950px;
    margin: 0 auto;
}

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 30px 20px;
    text-align: center;
    transition: all var(--transition);
}

.contact-card:hover {
    transform: translateY(-6px);
    border-color: var(--accent);
}

.contact-card svg {
    width: 30px;
    height: 30px;
    margin: 0 auto 14px;
    color: var(--accent);
}

.contact-card span {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.88rem;
    word-break: break-word;
}

/* =====================================================
   FOOTER
===================================================== */
.footer {
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.88rem;
}

.back-to-top {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: all var(--transition);
}

.back-to-top:hover {
    background: var(--accent);
    color: #fff;
}

/* =====================================================
   PROJECT DETAIL PAGE
===================================================== */
.detail-section {
    padding-top: 50px;
}

.detail-back {
    color: var(--accent);
    font-weight: 600;
    display: inline-block;
    margin-bottom: 24px;
}

.detail-header {
    margin-bottom: 30px;
}

.detail-header .project-category-badge {
    margin-bottom: 14px;
}

.detail-header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.detail-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

/* Detail layout: sidebar LEFT, main content RIGHT on desktop */
.detail-layout {
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 40px;
    align-items: start;
}

.detail-main {
    min-width: 0;
}

.detail-gallery {
    margin-bottom: 30px;
}

.gallery-main {
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 14px;
}

.gallery-main img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.gallery-thumbs {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.gallery-thumbs img {
    width: 100px;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: 8px;
    cursor: pointer;
    opacity: 0.6;
    border: 2px solid transparent;
    transition: all var(--transition);
}

.gallery-thumbs img.active,
.gallery-thumbs img:hover {
    opacity: 1;
    border-color: var(--accent);
}

.detail-description h3 {
    margin-bottom: 14px;
}

.detail-description p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.detail-tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}

.detail-sidebar {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 26px;
    height: fit-content;
    position: sticky;
    top: 90px;
}

.detail-sidebar h4 {
    margin-bottom: 18px;
}

.detail-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.detail-links a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-weight: 600;
    font-size: 0.9rem;
    transition: all var(--transition);
}

.detail-links a svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.detail-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.detail-links a.primary-link {
    background: var(--accent-gradient);
    color: #fff;
    border-color: transparent;
}

.detail-links a.primary-link:hover {
    color: #fff;
    opacity: 0.9;
}

.not-found {
    text-align: center;
    padding: 80px 0;
}

.not-found h2 {
    margin-bottom: 16px;
}

/* =====================================================
   RESPONSIVE
===================================================== */
@media (max-width: 992px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-photo {
        order: -1;
    }

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

    .hero-actions,
    .social-links {
        justify-content: center;
    }

    .skills-wrapper {
        grid-template-columns: 1fr;
    }

    .detail-layout {
        grid-template-columns: 1fr;
    }

    .detail-sidebar {
        position: static;
        order: 1;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 20px 24px;
        gap: 18px;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-150%);
        opacity: 0;
        transition: all var(--transition);
        z-index: 998;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .hamburger.open span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .hero-name {
        font-size: 2.1rem;
    }

    .section {
        padding: 60px 0;
    }

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

    .filter-bar {
        justify-content: flex-start;
        overflow-x: auto;
        flex-wrap: nowrap;
        padding-bottom: 8px;
    }
}

@media (max-width: 480px) {
    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}