/* ─── Theme variables ─── */
:root {
    --bg: #0a0a0f;
    --fg: #e4e4e7;
    --fg-muted: #a1a1aa;
    --fg-dim: #71717a;
    --fg-dimmer: #52525b;
    --accent: #16a34a;
    --accent-hover: #15803d;
    --card-bg: rgba(255,255,255,.03);
    --card-border: rgba(255,255,255,.06);
    --nav-bg: rgba(10,10,15,.85);
    --nav-border: rgba(255,255,255,.06);
    --nav-link: #a1a1aa;
    --nav-link-hover: #fff;
    --btn-sec-bg: rgba(255,255,255,.06);
    --btn-sec-fg: #e4e4e7;
    --btn-sec-border: rgba(255,255,255,.1);
    --btn-sec-hover: rgba(255,255,255,.1);
    --social-bg: rgba(255,255,255,.05);
    --social-border: rgba(255,255,255,.08);
    --social-fg: #a1a1aa;
    --tag-bg: rgba(255,255,255,.05);
    --tag-fg: #71717a;
    --skill-tag-bg: rgba(34,197,94,.12);
    --skill-tag-border: rgba(34,197,94,.2);
    --skill-tag-fg: #c4c4c7;
    --work-dot-border: #0a0a0f;
    --card-shadow: rgba(0,0,0,.3);
    --particle-color: rgba(34,197,94,.25);
}
.light {
    --bg: #f5f5f8;
    --fg: #18181b;
    --fg-muted: #52525b;
    --fg-dim: #71717a;
    --fg-dimmer: #a1a1aa;
    --accent: #16a34a;
    --accent-hover: #15803d;
    --card-bg: rgba(255,255,255,.8);
    --card-border: rgba(0,0,0,.08);
    --nav-bg: rgba(255,255,255,.85);
    --nav-border: rgba(0,0,0,.08);
    --nav-link: #52525b;
    --nav-link-hover: #18181b;
    --btn-sec-bg: rgba(0,0,0,.05);
    --btn-sec-fg: #18181b;
    --btn-sec-border: rgba(0,0,0,.1);
    --btn-sec-hover: rgba(0,0,0,.1);
    --social-bg: rgba(0,0,0,.04);
    --social-border: rgba(0,0,0,.08);
    --social-fg: #52525b;
    --tag-bg: rgba(0,0,0,.04);
    --tag-fg: #52525b;
    --skill-tag-bg: rgba(34,197,94,.1);
    --skill-tag-border: rgba(34,197,94,.15);
    --skill-tag-fg: #166534;
    --work-dot-border: #f5f5f8;
    --card-shadow: rgba(0,0,0,.1);
    --particle-color: rgba(34,197,94,.12);
}

/* ───────── Reset & Base ───────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background .3s, color .3s;
}
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-hover); }

/* ───────── Utilities ───────── */
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; width: 100%; }
.section { padding: 100px 0; }
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 48px;
    position: relative;
    display: inline-block;
}
.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 48px;
    height: 4px;
    border-radius: 2px;
    background: #16a34a;
}
.accent { color: var(--accent); }
.accent-link { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.accent-link:hover { opacity: 0.8; }
.gradient-text {
    color: #16a34a;
}

/* ───────── Particles BG ───────── */
#particles {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}
#particles span {
    position: absolute;
    width: 4px; height: 4px;
    background: var(--particle-color);
    border-radius: 50%;
    animation: float 20s infinite;
}
@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); opacity: .3; }
    50%      { transform: translateY(-80vh) scale(1.4); opacity: .7; }
}

/* ───────── Nav ───────── */
nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--nav-border);
    padding: 16px 0;
    transition: background .3s, border-color .3s;
}
nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.nav-logo {
    font-weight: 700;
    font-size: 1.15rem;
    cursor: pointer;
}
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a {
    color: var(--nav-link);
    font-size: .9rem;
    font-weight: 500;
    letter-spacing: .3px;
    text-transform: uppercase;
    transition: color .2s;
}
.nav-links a:hover { color: var(--nav-link-hover); }
.theme-toggle {
    position: relative;
    width: 48px;
    height: 26px;
    background: var(--card-border);
    border: 1px solid var(--card-border);
    border-radius: 13px;
    cursor: pointer;
    flex-shrink: 0;
    transition: background .3s, border-color .3s;
    padding: 0;
}
.theme-toggle::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--fg);
    transition: transform .3s, background .3s;
}
.light .theme-toggle::after {
    transform: translateX(22px);
}
.theme-toggle .icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: .65rem;
    line-height: 1;
    pointer-events: none;
    transition: opacity .3s;
}
.theme-toggle .icon-sun { left: 4px; opacity: .4; }
.theme-toggle .icon-moon { right: 4px; opacity: .7; }
.light .theme-toggle .icon-sun { opacity: .7; }
.light .theme-toggle .icon-moon { opacity: .4; }

/* ───────── Hero ───────── */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
}
.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    width: 100%;
    min-width: 0;
}
.hero-text h1 .gradient-text {
    white-space: nowrap;
}
.hero-image { flex-shrink: 0; }
.hero-image img {
    width: 240px;
    height: 240px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid rgba(34, 197, 94, .3);
    box-shadow: 0 0 60px rgba(34, 197, 94, .15);
    transition: all .3s;
}
.hero-image img:hover {
    border-color: #16a34a;
    box-shadow: 0 0 80px rgba(34, 197, 94, .25);
    transform: scale(1.02);
}
.hero h1 {
    font-size: clamp(2.5rem, 7vw, 4.2rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
}
.hero p {
    font-size: 1.15rem;
    color: var(--fg-muted);
    margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 10px;
    font-weight: 600;
    font-size: .95rem;
    transition: all .25s;
    cursor: pointer;
    border: none;
}
.btn-primary {
    background: #16a34a;
    color: #fff;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(34, 197, 94, .35);
    color: #fff;
}
.btn-secondary {
    background: var(--btn-sec-bg);
    color: var(--btn-sec-fg);
    border: 1px solid var(--btn-sec-border);
}
.btn-secondary:hover {
    background: var(--btn-sec-hover);
    transform: translateY(-2px);
}
.hero-social {
    display: flex;
    gap: 20px;
    margin-top: 40px;
}
.hero-social a {
    width: 44px; height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: var(--social-bg);
    border: 1px solid var(--social-border);
    color: var(--social-fg);
    font-size: 1.25rem;
    transition: all .25s;
}
.hero-social a:hover {
    background: rgba(34, 197, 94, .15);
    border-color: rgba(34, 197, 94, .3);
    color: #16a34a;
    transform: translateY(-3px);
}

/* ───────── About ───────── */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}
.about-text p { color: var(--fg-muted); margin-bottom: 16px; font-size: 1.05rem; }
.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    transition: background .3s, border-color .3s;
}
.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: #16a34a;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label { font-size: .85rem; color: var(--fg-dim); margin-top: 4px; }

/* ───────── Skills ───────── */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}
.skill-category {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 28px;
    transition: background .3s, border-color .3s;
}
.skill-category h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: .5px;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
    padding: 6px 14px;
    border-radius: 8px;
    background: var(--skill-tag-bg);
    border: 1px solid var(--skill-tag-border);
    font-size: .85rem;
    color: var(--skill-tag-fg);
    font-family: 'Fira Code', monospace;
    transition: background .3s, border-color .3s, color .3s;
}

/* ───────── Projects ───────── */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}
.project-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 28px;
    transition: background .3s, border-color .3s, transform .3s, box-shadow .3s;
    position: relative;
    overflow: hidden;
}
.project-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: #16a34a;
    opacity: 0;
    transition: opacity .3s;
}
.project-card:hover::before { opacity: 1; }
.project-card:hover {
    transform: translateY(-4px);
    border-color: rgba(34, 197, 94, .25);
    box-shadow: 0 12px 40px var(--card-shadow);
}
.project-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.project-icon {
    width: 40px; height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    overflow: hidden;
}
.project-icon img {
    width: 28px;
    height: 28px;
    object-fit: contain;
}
.project-card h3 { font-size: 1.1rem; font-weight: 600; }
.project-card p {
    color: var(--fg-muted);
    font-size: .9rem;
    margin-bottom: 16px;
    line-height: 1.6;
}
.project-tech { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.project-tech span {
    padding: 3px 10px;
    border-radius: 6px;
    background: var(--tag-bg);
    font-size: .75rem;
    font-family: 'Fira Code', monospace;
    color: var(--tag-fg);
    transition: background .3s, color .3s;
}
.project-links { display: flex; gap: 14px; }
.project-links a {
    font-size: .85rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ───────── Work ───────── */
.work-timeline { position: relative; padding-left: 32px; }
.work-timeline::before {
    content: '';
    position: absolute;
    left: 7px; top: 8px;
    width: 2px; height: calc(100% - 16px);
    background: rgba(34, 197, 94, .2);
}
.work-item { position: relative; margin-bottom: 48px; }
.work-item:last-child { margin-bottom: 0; }
.work-dot {
    position: absolute;
    left: -30px; top: 8px;
    width: 14px; height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--work-dot-border);
    box-shadow: 0 0 0 2px rgba(34, 197, 94, .3);
    transition: border-color .3s;
}
.work-item h3 { font-size: 1.1rem; font-weight: 600; }
.work-item .work-meta {
    font-size: .85rem;
    color: var(--fg-dim);
    margin: 4px 0 12px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.work-item p { color: var(--fg-muted); font-size: .9rem; line-height: 1.6; }
.work-item ul { color: var(--fg-muted); font-size: .9rem; padding-left: 20px; margin-top: 8px; }
.work-item ul li { margin-bottom: 4px; }

/* ───────── Achievements ───────── */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}
.achievement-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    padding: 24px;
    text-align: center;
    transition: background .3s, border-color .3s, transform .3s;
}
.achievement-card:hover {
    border-color: rgba(34, 197, 94, .25);
    transform: translateY(-2px);
}
.achievement-icon { font-size: 2rem; margin-bottom: 12px; }
.achievement-card h4 { font-size: .95rem; font-weight: 600; margin-bottom: 4px; }
.achievement-card p { font-size: .8rem; color: var(--fg-dim); }

/* ───────── Contact ───────── */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}
.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: background .3s, border-color .3s, transform .3s;
}
.contact-card:hover {
    background: rgba(34, 197, 94, .08);
    border-color: rgba(34, 197, 94, .25);
    transform: translateY(-2px);
}
.contact-icon {
    width: 44px; height: 44px;
    border-radius: 12px;
    background: rgba(34, 197, 94, .12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    flex-shrink: 0;
}
.contact-card h4 { font-size: .9rem; font-weight: 600; }
.contact-card p { font-size: .8rem; color: var(--fg-dim); }

/* ───────── Footer ───────── */
footer {
    border-top: 1px solid var(--nav-border);
    padding: 32px 0;
    text-align: center;
    font-size: .85rem;
    color: var(--fg-dimmer);
    transition: border-color .3s, color .3s;
}

/* ───────── Back to top ───────── */
#backToTop {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 99;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: opacity .3s, transform .3s, background .2s;
    box-shadow: 0 4px 16px rgba(0,0,0,.25);
    display: flex;
    align-items: center;
    justify-content: center;
}
#backToTop.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}
#backToTop:hover {
    background: var(--accent-hover);
}

/* ───────── Mobile ───────── */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .about-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-stats { grid-template-columns: 1fr 1fr; }
    .skills-grid { grid-template-columns: 1fr; }
    .projects-grid { grid-template-columns: 1fr; }
    .section { padding: 60px 0; }
    .hero { min-height: auto; padding: 120px 0 60px; }
    .hero-content { flex-direction: column-reverse; text-align: center; gap: 32px; align-items: stretch; }
    .hero-text { min-width: 0; }
    .hero-text h1 .gradient-text { white-space: normal; }
    .hero-actions { justify-content: center; }
    .hero-social { justify-content: center; gap: 5px; }
    .hero-image img { width: 160px; height: 160px; }
    .project-links {flex-direction: column;}
}