/* ------------------------------------------------------------------ *
   Do Tuan Anh — portfolio
   Direction: "Datasheet" — technical off-white paper, ink type,
   one signal-red accent, IBM Plex sans + mono, hairline rules.
 * ------------------------------------------------------------------ */

:root {
    --paper:   #f2f3ef;   /* cool technical off-white */
    --paper-2: #fbfbf8;   /* raised block */
    --ink:     #16181d;   /* near-black */
    --ink-2:   #5c6067;   /* muted / labels */
    --line:    #d8d9d1;   /* hairline */
    --line-2:  #c4c5bb;   /* stronger hairline */
    --accent:  #e4002b;   /* signal red */

    --font-display: 'IBM Plex Sans Condensed', 'IBM Plex Sans', system-ui, sans-serif;
    --font-body:    'IBM Plex Sans', system-ui, -apple-system, sans-serif;
    --font-mono:    'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;

    --maxw: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: var(--font-body);
    background: var(--paper);
    color: var(--ink);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

a { color: inherit; }

.wrap {
    max-width: var(--maxw);
    margin: 0 auto;
    padding-left: 28px;
    padding-right: 28px;
}

/* ---------- Header ---------- */
.site-head {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 100;
    background: color-mix(in srgb, var(--paper) 86%, transparent);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: border-color .25s ease;
}
.site-head.scrolled { border-bottom-color: var(--line); }

.site-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 58px;
}
.brand {
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: .8rem;
    letter-spacing: .08em;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 9px;
}
.brand::before {
    content: "";
    width: 8px; height: 8px;
    background: var(--accent);
    display: inline-block;
}
.menu { display: flex; gap: 26px; list-style: none; }
.menu a {
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--ink-2);
    text-decoration: none;
    transition: color .18s ease;
}
.menu a:hover { color: var(--ink); }

/* ---------- Hero ---------- */
.hero { padding: 122px 28px 64px; }

.eyebrow {
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--ink-2);
    display: flex;
    align-items: center;
    gap: 12px;
}
.eyebrow .mark { width: 22px; height: 2px; background: var(--accent); }

.hero-name {
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -0.005em;
    line-height: .92;
    font-size: clamp(2.9rem, 10vw, 6.5rem);
    margin: .18em 0 .12em;
}
.hero-role {
    font-family: var(--font-body);
    font-weight: 500;
    font-size: clamp(1rem, 2.4vw, 1.4rem);
    color: var(--ink);
}

.hero-signal {
    display: block;
    width: 100%;
    height: 76px;
    margin: 30px 0 34px;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr .85fr;
    gap: 48px;
    align-items: start;
}
.hero-intro {
    font-size: 1.04rem;
    color: var(--ink-2);
    max-width: 56ch;
}
.hero-cta { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }

.btn {
    font-family: var(--font-mono);
    font-size: .74rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    padding: 12px 20px;
    border: 1px solid var(--ink);
    color: var(--ink);
    background: transparent;
    text-decoration: none;
    display: inline-block;
    transition: background .18s ease, color .18s ease, border-color .18s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn--accent { border-color: var(--accent); color: var(--accent); }
.btn--accent:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- Spec table ---------- */
.spec { border-top: 1px solid var(--line-2); }
.spec-row {
    display: grid;
    grid-template-columns: 132px 1fr;
    gap: 18px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
}
.spec-row dt {
    font-family: var(--font-mono);
    font-size: .7rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--ink-2);
    padding-top: 3px;
}
.spec-row dd { font-size: .96rem; color: var(--ink); }
.spec-row dd a {
    text-decoration: none;
    border-bottom: 1px solid var(--accent);
    padding-bottom: 1px;
    transition: color .18s ease;
}
.spec-row dd a:hover { color: var(--accent); }

/* ---------- Sections ---------- */
.section { padding: 78px 28px; }
.section.wrap { padding-left: 28px; padding-right: 28px; }

.sec-head {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 34px;
}
.sec-no {
    font-family: var(--font-mono);
    font-size: .8rem;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: .05em;
}
.sec-title {
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    font-size: 1.1rem;
    white-space: nowrap;
}
.sec-line { flex: 1; height: 1px; background: var(--line-2); }

/* ---------- Stack ---------- */
.stack { border-top: 1px solid var(--line-2); }
.stack-row {
    display: grid;
    grid-template-columns: 168px 1fr;
    gap: 18px;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    align-items: start;
}
.stack-row dt {
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--ink-2);
    padding-top: 5px;
}
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.tags li,
.modal .tech-tag {
    font-family: var(--font-mono);
    font-size: .74rem;
    padding: 5px 10px;
    border: 1px solid var(--line-2);
    background: var(--paper-2);
    color: var(--ink);
    white-space: nowrap;
}

/* ---------- Project entries ---------- */
.entries { border-top: 1px solid var(--line-2); }

.entry {
    display: grid;
    grid-template-columns: 52px 1fr minmax(0, 38%);
    gap: 26px;
    padding: 28px 12px;
    margin: 0 -12px;
    border-bottom: 1px solid var(--line);
    cursor: pointer;
    transition: background .2s ease;
    outline-offset: 3px;
}
.entry:hover { background: var(--paper-2); }
.entry:hover .entry-id { color: var(--accent); }

.entry-id,
.exp-row .entry-id {
    font-family: var(--font-mono);
    font-size: .78rem;
    color: var(--ink-2);
    letter-spacing: .04em;
    padding-top: 6px;
    transition: color .2s ease;
}
.entry-title {
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .01em;
    font-size: 1.32rem;
    line-height: 1.1;
}
.entry-sub {
    font-family: var(--font-mono);
    font-size: .72rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--ink-2);
    margin-top: 4px;
}
.entry-desc {
    color: var(--ink-2);
    font-size: .96rem;
    margin: 13px 0 14px;
    max-width: 60ch;
}
.entry-more {
    font-family: var(--font-mono);
    font-size: .72rem;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--accent);
}
.entry-media {
    align-self: stretch;
    overflow: hidden;
    border: 1px solid var(--line);
    background: var(--paper-2);
}
.entry-media img {
    display: block;
    width: 100%;
    height: 100%;
    max-height: 190px;
    object-fit: cover;
    filter: grayscale(1) contrast(1.03);
    transition: filter .35s ease, transform .35s ease;
}
.entry:hover .entry-media img { filter: none; transform: scale(1.03); }

/* ---------- Experience ---------- */
.jobs { border-top: 1px solid var(--line-2); }
.job {
    display: grid;
    grid-template-columns: 52px 1fr auto;
    gap: 26px;
    padding: 26px 0;
    border-bottom: 1px solid var(--line);
}
.job-head { margin-bottom: 12px; }
.job-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.16rem;
    text-transform: uppercase;
    letter-spacing: .01em;
    line-height: 1.15;
}
.job-kind {
    font-family: var(--font-mono);
    font-size: .6rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--ink-2);
    border: 1px solid var(--line-2);
    padding: 2px 6px;
    margin-left: 8px;
    vertical-align: 2px;
}
.job-org {
    font-family: var(--font-mono);
    font-size: .74rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--ink-2);
    display: block;
    margin-top: 5px;
}
.job-date {
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .04em;
    color: var(--ink-2);
    white-space: nowrap;
    text-align: right;
}
.job-flag {
    display: block;
    font-style: normal;
    color: var(--accent);
    margin-top: 5px;
    letter-spacing: .1em;
    text-transform: uppercase;
    font-size: .66rem;
}

/* shared bullet list */
.points { list-style: none; }
.points li {
    position: relative;
    padding: 6px 0 6px 20px;
    font-size: .95rem;
    color: var(--ink-2);
    max-width: 76ch;
}
.points li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--accent);
}
.points li strong { color: var(--ink); font-weight: 600; }

/* ---------- Records (education) & awards ---------- */
.record { border-top: 1px solid var(--line-2); padding-top: 22px; }
.rec-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 16px;
    flex-wrap: wrap;
}
.rec-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.2rem;
    text-transform: uppercase;
    letter-spacing: .01em;
}
.rec-sub {
    font-family: var(--font-mono);
    font-size: .78rem;
    color: var(--ink-2);
    margin: 8px 0 14px;
}
.award-list { border-top: 1px solid var(--line-2); padding-top: 6px; }
.award-list li { padding-top: 12px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }

/* ---------- Footer ---------- */
.foot {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
    padding-top: 26px;
    padding-bottom: 52px;
    margin-top: 20px;
    border-top: 1px solid var(--line-2);
    font-family: var(--font-mono);
    font-size: .7rem;
    letter-spacing: .04em;
    color: var(--ink-2);
}

/* ---------- Modal ---------- */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(22, 24, 29, .55);
    backdrop-filter: blur(4px);
    padding: 24px;
    overflow-y: auto;
}
.modal.open { display: block; }
.modal-panel {
    position: relative;
    background: var(--paper);
    border: 1px solid var(--ink);
    max-width: 860px;
    width: 100%;
    margin: 6vh auto 8vh;
    animation: modalIn .28s ease;
}
@keyframes modalIn {
    from { opacity: 0; transform: translateY(14px); }
    to   { opacity: 1; transform: none; }
}
.modal-x {
    position: absolute;
    top: 12px; right: 12px;
    width: 34px; height: 34px;
    border: 1px solid var(--line-2);
    background: var(--paper);
    color: var(--ink);
    font-size: 1.3rem;
    line-height: 1;
    cursor: pointer;
    transition: background .18s ease, color .18s ease;
}
.modal-x:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

.modal-head { padding: 28px 30px 20px; border-bottom: 1px solid var(--line); }
.modal-kicker {
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--accent);
}
.modal-head h2 {
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .01em;
    font-size: 1.7rem;
    margin-top: 8px;
}
.modal-sub {
    font-family: var(--font-mono);
    font-size: .74rem;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--ink-2);
    margin-top: 4px;
}
.modal-media { background: #fff; border-bottom: 1px solid var(--line); }
.modal-media img {
    display: block;
    width: 100%;
    max-height: 380px;
    object-fit: contain;
}
.modal-body { padding: 26px 30px 32px; }
.modal-body > p { color: var(--ink-2); margin-bottom: 18px; }
.modal-body .tags { margin-bottom: 22px; }
.modal-features h3 {
    font-family: var(--font-mono);
    font-size: .74rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--ink);
    margin-bottom: 12px;
}
.modal-features ul { list-style: none; }
.modal-features li {
    position: relative;
    padding: 8px 0 8px 20px;
    border-bottom: 1px solid var(--line);
    font-size: .93rem;
    color: var(--ink);
}
.modal-features li::before {
    content: "—";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* ---------- Reveal on scroll ---------- */
.reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .6s ease, transform .6s ease;
}
.reveal.in { opacity: 1; transform: none; }

/* ---------- Focus ---------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
    .hero-grid { grid-template-columns: 1fr; gap: 34px; }
    .entry { grid-template-columns: 44px 1fr; }
    .entry-media { grid-column: 1 / -1; }
    .entry-media img { max-height: 240px; }
}
@media (max-width: 640px) {
    .menu { display: none; }
    .hero { padding-top: 104px; }
    .hero-name { font-size: clamp(2.6rem, 15vw, 4rem); }
    .stack-row { grid-template-columns: 1fr; gap: 8px; }
    .stack-row dt { padding-top: 0; }
    .spec-row { grid-template-columns: 110px 1fr; gap: 12px; }
    .job { grid-template-columns: 40px 1fr; gap: 18px; }
    .job-date { grid-column: 2; text-align: left; margin-top: 12px; }
    .points li { max-width: none; }
    .section { padding: 60px 28px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
    .reveal { opacity: 1; transform: none; transition: none; }
    .entry-media img { transition: none; }
}