/* ============================================================
   Shared styles — all project / internship / personal pages
   ============================================================ */

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

/* === Variables === */
:root {
    --bg: #ffffff; --bg-2: #f8f9fc; --text: #0f172a; --muted: #64748b;
    --subtle: #e2e8f0; --blue: #2563eb; --blue-lt: #eff6ff; --blue-dk: #1d4ed8;
    --yellow: #fde047; --black: #0f172a;
}

/* === Base === */
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--text); font-family: 'DM Sans', sans-serif; font-weight: 400; line-height: 1.7; overflow-x: hidden; }

/* === Nav === */
nav.site-nav { position: fixed; top: 0; width: 100%; z-index: 300; padding: 1.4rem 5rem; display: flex; justify-content: space-between; align-items: center; background: var(--blue); border-bottom: 2px solid var(--black); transition: background 0.3s, border-color 0.3s; }
nav.site-nav.nav-light { background: #ffffff; }
nav.site-nav.nav-light .logo { color: var(--text); }
nav.site-nav.nav-light ul a { color: var(--muted); }
nav.site-nav.nav-light ul a::after { background: var(--blue); }
nav.site-nav.nav-light .nav-engineering::after { background: var(--yellow); }
nav.site-nav.nav-light .nav-internship::after { background: #d8b4fe; }
nav.site-nav.nav-light .nav-personal::after { background: #f9a8d4; }
nav.site-nav.nav-light ul a:hover { color: var(--text); }
nav.site-nav.nav-light .hamburger span { background: var(--black); }
@media (max-width: 768px) { nav.site-nav.nav-light ul { background: #ffffff; } }
.logo { font-family: 'Plus Jakarta Sans', sans-serif; font-weight: 800; font-size: 1rem; letter-spacing: 0.08em; text-transform: uppercase; color: white; text-decoration: none; }
nav.site-nav ul { list-style: none; display: flex; gap: 2.8rem; }
nav.site-nav ul a { font-family: 'DM Sans', sans-serif; font-weight: 500; font-size: 0.84rem; color: rgba(255,255,255,0.85); text-decoration: none; transition: color 0.2s; position: relative; }
nav.site-nav ul a::after { content: ''; position: absolute; bottom: -3px; left: 0; width: 100%; height: 2px; background: white; transform: scaleX(0); transform-origin: left; transition: transform 0.25s ease; }
nav.site-nav ul a:hover { color: white; }
nav.site-nav ul a:hover::after { transform: scaleX(1); }
nav.site-nav .nav-engineering::after { background: var(--yellow); }
nav.site-nav .nav-internship::after { background: #d8b4fe; }
nav.site-nav .nav-personal::after { background: #f9a8d4; }
.hamburger { display: none; flex-direction: column; justify-content: space-between; width: 24px; height: 18px; background: none; border: none; cursor: pointer; padding: 0; z-index: 400; outline: none; -webkit-tap-highlight-color: transparent; appearance: none; -webkit-appearance: none; box-shadow: none; overflow: hidden; clip-path: inset(0); -webkit-clip-path: inset(0); }
.hamburger span { display: block; width: 100%; height: 2px; background: white; transition: transform 0.3s ease, opacity 0.3s ease; border-radius: 0; border: none; box-shadow: none; backface-visibility: hidden; -webkit-backface-visibility: hidden; }
.hamburger.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scale(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
.back-link { display: inline-flex; align-items: center; gap: 0.5rem; font-weight: 500; font-size: 0.84rem; color: rgba(255,255,255,0.85); text-decoration: none; transition: color 0.2s, gap 0.2s; }
.back-link:hover { color: white; gap: 0.75rem; }
@media (max-width: 768px) {
    nav.site-nav { padding-left: 1.5rem; padding-right: 1.5rem; }
    .hamburger { display: flex; }
    nav.site-nav ul { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; width: 100%; background: var(--blue); border-bottom: 2px solid var(--black); padding: 1.5rem 2rem; gap: 1.2rem; }
    nav.site-nav ul.open { display: flex; }
    nav.site-nav ul a { font-size: 1rem; }
}

/* === Page wrapper === */
.page { max-width: 1400px; margin: 0 auto; padding: 6rem 4rem 0; }

/* === Layout helpers === */
.layout-full { width: 100%; }
.layout-2col { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.layout-sidebar { display: grid; grid-template-columns: 1fr 2fr; gap: 2.5rem; }
.layout-3col { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1.5rem; }
.layout-4col { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 1rem; }
.col { min-width: 0; }

/* === Typography === */
h1 { font-family: 'Plus Jakarta Sans', sans-serif; font-weight: 800; font-size: clamp(1.6rem, 3vw, 2.4rem); letter-spacing: -0.03em; line-height: 1; color: var(--text); margin-bottom: 1.5rem; }
h2 { font-family: 'Plus Jakarta Sans', sans-serif; font-weight: 800; font-size: clamp(1.5rem, 3vw, 2.2rem); letter-spacing: -0.025em; color: var(--text); text-shadow: 2px 2px 0 rgba(37,99,235,0.08); margin-bottom: 0.5rem; }
p { font-size: 0.97rem; color: var(--muted); line-height: 1.78; margin-bottom: 1rem; }
p strong { color: var(--text); font-weight: 700; }
p em { color: var(--text); font-style: normal; font-weight: 600; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
section { margin-bottom: 3.5rem; }

/* === Stats band === */
.stats-band { background: var(--blue-dk); color: white; padding: 1.4rem 2.5rem; border: 2px solid var(--black); box-shadow: 4px 4px 0 var(--black); }
.stats-band p { color: white; margin: 0; font-size: 1rem; }
.stats-band strong { color: var(--yellow); }
.stats-band em { color: white; font-style: normal; font-weight: 500; }

/* === Images === */
img { width: 100%; height: auto; display: block; object-fit: cover; border: 1px solid var(--subtle); background: var(--bg-2); }
.col img + img { margin-top: 1rem; }
.caption { font-size: 0.82rem; color: var(--muted); line-height: 1.6; margin-top: 0.6rem; margin-bottom: 0; }
.img-num { position: absolute; top: 0.5rem; right: 0.5rem; border: 2px solid var(--black); box-shadow: 2px 2px 0 var(--black); font-family: 'Plus Jakarta Sans', sans-serif; font-weight: 800; font-size: 1.44rem; width: 3.2rem; height: 3.2rem; display: flex; align-items: center; justify-content: center; z-index: 2; }

/* === Video === */
.video-wrap { position: relative; aspect-ratio: 16/9; background: var(--bg-2); border: 1px solid var(--subtle); overflow: hidden; }
.video-wrap iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: none; }

/* === Document placeholder === */
.document-placeholder { background: var(--bg-2); border: 1px solid var(--subtle); aspect-ratio: 8.5/11; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.75rem; padding: 1.5rem; }
.document-placeholder .doc-icon { font-size: 2rem; opacity: 0.3; }
.document-placeholder .doc-label { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); text-align: center; }

/* === Carousel grid === */
.carousel-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.5rem; margin-top: 1rem; }

/* === Photo grid === */
.photo-grid { display: flex; width: 100%; gap: 1rem; align-items: flex-start; }
.photo-grid .pg-col { min-width: 0; }
.photo-grid .pg-col img { width: 100%; height: auto; display: block; border: none; }
.photo-grid .pg-col-stack { display: flex; flex-direction: column; gap: 1rem; }

/* === Header variants === */
.header-a { display: grid; grid-template-columns: 1fr 1fr; border: 2px solid var(--black); overflow: hidden; }
.header-a .img-panel { position: relative; min-height: 340px; }
.header-a .img-panel img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border: none; }
.header-a .text-panel { display: flex; flex-direction: column; justify-content: center; padding: 3rem; background: var(--bg); border-left: 2px solid var(--black); }
.header-b { position: relative; height: 52vh; min-height: 320px; overflow: hidden; border: 2px solid var(--black); }
.header-b img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border: none; }
.header-b .overlay { position: absolute; inset: 0; background: linear-gradient(to right, rgba(0,0,0,0.72) 0%, rgba(0,0,0,0.28) 60%, rgba(0,0,0,0.0) 100%); }
.header-b .text-panel { position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: center; padding: 3.5rem; max-width: 60%; }
.header-b .text-panel h1 { color: white; margin-bottom: 1rem; }
.header-b .text-panel p { color: rgba(255,255,255,0.82); font-size: 0.88rem; margin-bottom: 0.6rem; }
.header-b .eyebrow { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.18em; text-transform: uppercase; color: var(--yellow); margin-bottom: 0.75rem; }
.header-c { display: grid; grid-template-columns: 3fr 2fr; border: 2px solid var(--black); overflow: hidden; }
.header-c .text-panel { display: flex; flex-direction: column; justify-content: center; padding: 3rem; background: var(--bg); }
.header-c .img-panel { position: relative; }
.header-c .img-panel img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border: none; }

/* === Reveal animation === */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.55s ease, transform 0.55s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* === Project nav === */
.project-nav { border-top: 2px solid rgba(255,255,255,0.08); padding: 1.5rem 5rem; display: flex; justify-content: space-between; align-items: center; background: var(--text); }
.proj-nav-link { display: flex; flex-direction: column; gap: 0.3rem; text-decoration: none; color: inherit; transition: opacity 0.2s; }
.proj-nav-link:hover { opacity: 0.6; }
.proj-nav-label { font-size: 0.66rem; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(255,255,255,0.45); }
.proj-nav-title { font-family: 'Plus Jakarta Sans', sans-serif; font-weight: 700; font-size: 1.3rem; letter-spacing: -0.015em; color: white; }
.proj-nav-link.right { text-align: right; }

/* === Footer === */
footer#page-footer { background: var(--text); border-top: 1px solid rgba(255,255,255,0.08); padding: 1.2rem 5rem; display: flex; justify-content: space-between; align-items: center; }

/* === Keyframes === */
@keyframes sigColor {
    0%   { filter: brightness(0) invert(1) sepia(1) saturate(8) hue-rotate(0deg) brightness(0.75); }
    100% { filter: brightness(0) invert(1) sepia(1) saturate(8) hue-rotate(360deg) brightness(0.75); }
}
@keyframes sigColorBg {
    0%   { background-color: #ef4444; }
    16%  { background-color: #f97316; }
    33%  { background-color: #eab308; }
    50%  { background-color: #22c55e; }
    66%  { background-color: #3b82f6; }
    83%  { background-color: #a855f7; }
    100% { background-color: #ef4444; }
}

/* === Responsive === */
@media (max-width: 900px) {
    nav.site-nav { padding-left: 1.5rem; padding-right: 1.5rem; }
    .page { padding: 5rem 1.5rem 0; }
    .layout-2col, .layout-sidebar, .layout-3col { grid-template-columns: 1fr 1fr; }
    .layout-4col { grid-template-columns: 1fr 1fr; }
    .project-nav { padding-left: 1.5rem; padding-right: 1.5rem; flex-direction: column; gap: 2rem; align-items: center; }
    .proj-nav-link, .proj-nav-link.right { text-align: center; }
    footer#page-footer { padding-left: 1.5rem; padding-right: 1.5rem; flex-direction: column; gap: 1rem; align-items: center; text-align: center; }
}
@media (max-width: 768px) {
    .header-a { grid-template-columns: 1fr; }
    .header-a .img-panel { min-height: 240px; }
    .header-a .text-panel { border-left: none; border-top: 2px solid var(--black); }
    .header-b .text-panel { max-width: 100%; padding: 2rem; }
    .header-b .overlay { background: linear-gradient(to bottom, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.75) 100%); }
    .header-b .text-panel { justify-content: flex-end; }
    .header-c .img-panel { display: none; }
    .header-c { grid-template-columns: 1fr; }
    .photo-grid { flex-direction: column; }
    .photo-grid .pg-col { flex: none !important; width: 100%; }
}
@media (max-width: 540px) {
    .layout-2col, .layout-sidebar, .layout-3col, .layout-4col, .carousel-grid { grid-template-columns: 1fr; }
}