/* ==========================================================================
   Lawaz Islam Portfolio — styles.css
   All values derive from DESIGN.md. No drop shadows anywhere (D-007).
   ========================================================================== */

@font-face {
  font-family: 'Mona Sans';
  src: url('assets/fonts/MonaSansVF.woff2') format('woff2');
  font-weight: 200 900;
  font-stretch: 75% 125%;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('assets/fonts/JetBrainsMono-Regular.woff2') format('woff2');
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: 'JetBrains Mono';
  src: url('assets/fonts/JetBrainsMono-Medium.woff2') format('woff2');
  font-weight: 500;
  font-display: swap;
}

:root {
  --color-deep-void: #0d1117;
  --color-abyss: #000000;
  --color-carbon: #151a22;
  --color-slate-edge: #21262d;
  --color-fog: #484f58;
  --color-pearl: #a4aea6;
  --color-moss: #7c8980;
  --color-snow: #ffffff;

  --color-track-data: #08872b;
  --color-track-data-bright: #5fed83;
  --color-track-data-wash: #0d3024;
  --color-track-eng: #8dd6ff;
  --color-track-eng-deep: #1f6feb;

  --surface-glass: rgba(255, 255, 255, 0.06);
  --surface-glass-hover: rgba(255, 255, 255, 0.1);

  --font-sans: 'Mona Sans', 'Inter', ui-sans-serif, system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --radius-button: 6px;
  --radius-input: 8px;
  --radius-image: 8px;
  --radius-card: 24px;

  --page-max-width: 1200px;
  --section-gap: 96px;
  --card-padding: 24px;

  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --duration-micro: 0.2s;
  --duration-reveal: 0.4s;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--color-deep-void);
  color: var(--color-pearl);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-track-eng); text-decoration: none; transition: opacity var(--duration-micro) var(--ease); }
a:hover { opacity: 0.85; }
:focus-visible { outline: 2px solid var(--color-track-data-bright); outline-offset: 2px; border-radius: 2px; }
::selection { background: var(--color-track-data-wash); color: var(--color-snow); }

h1, h2, h3 { color: var(--color-snow); font-weight: 460; }
.display { font-size: clamp(40px, 6vw, 64px); font-weight: 480; line-height: 1.08; letter-spacing: -0.035em; color: var(--color-snow); }
h2 { font-size: clamp(32px, 4vw, 40px); line-height: 1.2; letter-spacing: -0.02em; }
h3 { font-size: 24px; line-height: 1.3; letter-spacing: -0.01em; font-weight: 500; }
.body-lg { font-size: 18px; letter-spacing: 0.01em; }
.body-sm { font-size: 14px; }
.eyebrow { font-family: var(--font-mono); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-moss); display: block; margin-bottom: 16px; }
.eyebrow--data { color: var(--color-track-data-bright); }
.eyebrow--eng { color: var(--color-track-eng); }

.container { max-width: var(--page-max-width); margin: 0 auto; padding: 0 24px; }
section { padding: var(--section-gap) 0; }
@media (max-width: 720px) { section { padding: 56px 0; } }

.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.001s !important; animation-iteration-count: 1 !important; }
}

.nav { position: sticky; top: 0; z-index: 100; height: 64px; display: flex; align-items: center; background: transparent; transition: background var(--duration-micro) var(--ease), border-color var(--duration-micro) var(--ease); border-bottom: 1px solid transparent; }
.nav.is-scrolled { background: rgba(21, 26, 34, 0.85); backdrop-filter: blur(20px); border-bottom-color: var(--color-slate-edge); }
.nav .container { display: flex; align-items: center; justify-content: space-between; width: 100%; }
.nav__brand { color: var(--color-snow); font-weight: 500; font-size: 16px; letter-spacing: -0.01em; }
.nav__links { display: flex; align-items: center; gap: 8px; list-style: none; }
.nav__links a { color: var(--color-pearl); font-size: 15px; padding: 6px 14px; border-radius: var(--radius-button); transition: color var(--duration-micro) var(--ease), background var(--duration-micro) var(--ease); }
.nav__links a:hover { color: var(--color-snow); background: var(--surface-glass); opacity: 1; }
.nav__cta { background: var(--color-track-data); color: var(--color-snow) !important; border-radius: var(--radius-button) !important; font-weight: 500; }
.nav__cta:hover { background: var(--color-track-data); opacity: 0.9 !important; }
@media (max-width: 720px) { .nav__links li:not(.nav__cta-item) { display: none; } }

.btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 20px; border-radius: var(--radius-button); font-family: var(--font-sans); font-size: 16px; font-weight: 500; border: none; cursor: pointer; transition: opacity var(--duration-micro) var(--ease), transform var(--duration-micro) var(--ease), background var(--duration-micro) var(--ease); }
.btn:hover { opacity: 0.9; transform: translateY(-1px); }
.btn--data { background: var(--color-track-data); color: var(--color-snow); }
.btn--eng { background: var(--color-track-eng-deep); color: var(--color-snow); }
.btn--ghost { background: transparent; color: var(--color-snow); border: 1px solid rgba(255, 255, 255, 0.3); }
.btn--ghost:hover { background: var(--surface-glass); opacity: 1; }

.card { background: var(--surface-glass); backdrop-filter: blur(20px); border: 1px solid var(--color-slate-edge); border-radius: var(--radius-card); padding: var(--card-padding); transition: background var(--duration-micro) var(--ease), transform var(--duration-micro) var(--ease); }
.card:hover { background: var(--surface-glass-hover); }

.tag { display: inline-block; font-family: var(--font-mono); font-size: 12px; font-weight: 500; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-pearl); border: 1px solid var(--color-fog); border-radius: var(--radius-button); padding: 4px 12px; }
.tag--data { color: var(--color-track-data-bright); border-color: var(--color-track-data); }
.tag--eng { color: var(--color-track-eng); border-color: var(--color-track-eng); }

.hero { position: relative; min-height: calc(100vh - 64px); display: flex; align-items: center; overflow: hidden; padding: 64px 0; }
.hero::before { content: ''; position: absolute; inset: 0; background: linear-gradient(to right, rgba(128,128,128,0.05) 1px, transparent 1px), linear-gradient(to bottom, rgba(128,128,128,0.05) 1px, transparent 1px); background-size: 24px 24px; mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black, transparent); }
.hero__halo { position: absolute; top: -10%; right: -5%; width: 60vw; height: 60vw; max-width: 800px; max-height: 800px; background: radial-gradient(circle, rgba(31,111,235,0.22), transparent 65%); filter: blur(60px); opacity: 0.35; pointer-events: none; }
.hero__grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0,1.2fr) minmax(0,1fr); gap: 48px; align-items: center; }
@media (max-width: 960px) { .hero__grid { grid-template-columns: 1fr; } }
.hero__keywords { margin-top: 24px; color: var(--color-pearl); font-size: 18px; letter-spacing: 0.01em; }
.hero__keywords .divider { color: var(--color-fog); margin: 0 6px; }
.hero__ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.hero__secondary { margin-top: 20px; display: inline-block; font-size: 15px; }
.hero .stagger { opacity: 0; transform: translateY(20px); animation: heroIn 0.6s var(--ease) forwards; }
.hero .stagger:nth-child(1) { animation-delay: 0.1s; }
.hero .stagger:nth-child(2) { animation-delay: 0.25s; }
.hero .stagger:nth-child(3) { animation-delay: 0.4s; }
.hero .stagger:nth-child(4) { animation-delay: 0.55s; }
.hero .stagger:nth-child(5) { animation-delay: 0.7s; }
@keyframes heroIn { to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .hero .stagger { opacity: 1; transform: none; animation: none; } }
.proof { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.proof .card { padding: 20px; border-radius: var(--radius-card); }
.proof__value { font-size: 28px; font-weight: 480; letter-spacing: -0.02em; color: var(--color-snow); font-variant-numeric: tabular-nums; }
.proof__label { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-moss); margin-top: 6px; }
.proof .card--data { border-top: 3px solid var(--color-track-data); }
.proof .card--eng { border-top: 3px solid var(--color-track-eng); }
@keyframes bob { 0%,100% { transform: translate(-50%,0); } 50% { transform: translate(-50%,8px); } }

.about__body { max-width: 720px; }
.about__body p + p { margin-top: 16px; }
.about__pgwp { color: var(--color-snow); }
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 48px; }
@media (max-width: 820px) { .about__grid { grid-template-columns: 1fr; } }
.edu-item + .edu-item { margin-top: 16px; }
.edu-item strong { color: var(--color-snow); font-weight: 500; }
.edu-item span { display: block; font-size: 14px; color: var(--color-moss); margin-top: 2px; }
.cert-list { list-style: none; }
.cert-list li { padding: 10px 0; border-bottom: 1px solid var(--color-slate-edge); font-size: 15px; }
.cert-list li:last-child { border-bottom: none; }
.cert-list li span { color: var(--color-moss); font-size: 13px; }

.tracks__layout { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.2fr); gap: 48px; align-items: start; margin-top: 40px; }
@media (max-width: 900px) { .tracks__layout { grid-template-columns: 1fr; } }
.track-item { cursor: pointer; padding: 20px; border-radius: var(--radius-card); border: 1px solid transparent; transition: background var(--duration-micro) var(--ease), border-color var(--duration-micro) var(--ease); }
.track-item + .track-item { margin-top: 12px; }
.track-item.is-active { background: var(--surface-glass); backdrop-filter: blur(20px); border-color: var(--color-slate-edge); }
.track-item h3 { margin-bottom: 6px; }
.track-item p { font-size: 15px; }
.track-item__progress { margin-top: 14px; height: 2px; background: var(--color-slate-edge); border-radius: 2px; overflow: hidden; }
.track-item__bar { height: 100%; width: 0%; }
.track-item--data .track-item__bar { background: var(--color-track-data-bright); }
.track-item--eng .track-item__bar { background: var(--color-track-eng); }
.track-preview { position: relative; }
.track-panel { display: none; }
.track-panel.is-active { display: block; animation: heroIn 0.5s var(--ease); }
.track-panel .card { border-radius: var(--radius-card); }
.track-panel--data .card { border-top: 3px solid var(--color-track-data); }
.track-panel--eng .card { border-top: 3px solid var(--color-track-eng); }
.track-panel__stats { display: flex; gap: 24px; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--color-slate-edge); }
.track-panel__stats div strong { display: block; color: var(--color-snow); font-size: 22px; font-weight: 480; letter-spacing: -0.02em; }
.track-panel__stats div span { font-size: 13px; color: var(--color-moss); }
.tracks__more { margin-top: 32px; }

.timeline { position: relative; margin-top: 40px; padding-left: 28px; }
.timeline::before { content: ''; position: absolute; left: 4px; top: 8px; bottom: 8px; width: 1px; background: var(--color-slate-edge); }
.timeline__entry { position: relative; }
.timeline__entry + .timeline__entry { margin-top: 24px; }
.timeline__entry::before { content: ''; position: absolute; left: -28px; top: 8px; width: 8px; height: 8px; border-radius: 50%; background: var(--color-moss); }
.timeline__entry--data::before { background: var(--color-track-data-bright); }
.timeline__entry--eng::before { background: var(--color-track-eng); }
.timeline__entry .card--featured { padding: 32px; }
.card--featured ul { margin-top: 12px; padding-left: 18px; }
.card--featured li { margin-top: 6px; font-size: 15px; }
.role__meta { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-moss); margin-top: 4px; }
.role--compact h3 { font-size: 16px; font-weight: 500; }
.role--compact p { font-size: 14px; margin-top: 4px; }

.leadership__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 40px; }
@media (max-width: 820px) { .leadership__grid { grid-template-columns: 1fr; } }
.leadership__grid .card h3 { font-size: 17px; font-weight: 500; }
.leadership__grid .card p { font-size: 14px; margin-top: 8px; }

.contact { text-align: left; }
.contact__body { max-width: 640px; margin-top: 16px; }
.contact__links { display: flex; flex-wrap: wrap; gap: 24px; margin-top: 28px; font-size: 16px; }
.contact__ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.footer { border-top: 1px solid var(--color-slate-edge); padding: 40px 0; }
.footer .container { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between; }
.footer__status { display: inline-flex; align-items: center; gap: 8px; color: var(--color-pearl); font-size: 14px; }
.footer__status::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--color-track-data-bright); }
.footer__links { display: flex; gap: 20px; font-size: 14px; }
.footer__caption { width: 100%; font-family: var(--font-mono); font-size: 12px; color: var(--color-moss); margin-top: 8px; }

.projects-intro { padding-bottom: 24px; }
.projects-intro p { max-width: 640px; margin-top: 12px; }
.stack { padding-top: 0; }
.stack__card-wrap { position: sticky; display: flex; align-items: flex-start; justify-content: center; padding: 24px 0 64px; }
.stack__card-wrap:nth-child(1) { top: 84px; }
.stack__card-wrap:nth-child(2) { top: 96px; }
.stack__card-wrap:nth-child(3) { top: 108px; }
.stack__card-wrap:nth-child(4) { top: 120px; }
.stack__card-wrap:nth-child(5) { top: 132px; }
.project-card { width: 100%; max-width: 860px; background: var(--color-carbon); border: 1px solid var(--color-slate-edge); border-radius: var(--radius-card); padding: 40px; }
.project-card--data { border-top: 3px solid var(--color-track-data); }
.project-card--eng { border-top: 3px solid var(--color-track-eng); }
.project-card__head { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.project-card h2 { font-size: clamp(24px, 3vw, 32px); }
.project-card__one-liner { color: var(--color-snow); font-size: 17px; margin-bottom: 12px; }
.project-card__body { font-size: 15px; max-width: 680px; }
.project-card__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.project-card__foot { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; margin-top: 24px; }
.project-card__credit { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-moss); }
@media (max-width: 720px) { .project-card { padding: 24px; } .stack__card-wrap { position: static; padding: 12px 0; } }
.projects-cta { text-align: left; }
.projects-cta .contact__ctas { margin-top: 24px; }

.legal h3 { font-size: 20px; }
.legal p { font-size: 16px; }

/* ==========================================================================
   v2 sections (D-020): hero context, who I am, capabilities, impact, journey chapters, side quests
   ========================================================================== */
.hero__inner { position: relative; z-index: 1; max-width: 760px; }
.hero__context { margin-top: 20px; color: var(--color-moss); font-size: 15px; max-width: 560px; }

.whoami { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 32px; max-width: 1040px; }
@media (max-width: 860px) { .whoami { grid-template-columns: 1fr; gap: 16px; } }
.whoami__col p + p { margin-top: 16px; }
.whoami__note { color: var(--color-snow); border-left: 2px solid var(--color-track-data); padding-left: 16px; }

.capabilities { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 40px; }
@media (max-width: 960px) { .capabilities { grid-template-columns: 1fr; } }
.capability { display: flex; flex-direction: column; gap: 12px; }
.capability--data { border-top: 3px solid var(--color-track-data); }
.capability--eng { border-top: 3px solid var(--color-track-eng); }
.capability h3 { font-size: 20px; }
.capability p { font-size: 15px; }
.capability__proof { margin-top: auto; padding-top: 16px; border-top: 1px solid var(--color-slate-edge); font-size: 14px; color: var(--color-pearl); }
.capability__proof strong { display: block; color: var(--color-snow); font-size: 28px; font-weight: 480; letter-spacing: -0.02em; margin-bottom: 4px; }

.about__links { display: flex; flex-wrap: wrap; gap: 20px; margin-top: 20px; font-size: 15px; }

.impact { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 40px; }
@media (max-width: 1000px) { .impact { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .impact { grid-template-columns: 1fr; } }
.impact__tile { padding: 20px; }
.impact__tile--data { border-top: 3px solid var(--color-track-data); }
.impact__tile--eng { border-top: 3px solid var(--color-track-eng); }
.impact__value { color: var(--color-snow); font-size: 30px; font-weight: 480; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.impact__label { margin-top: 6px; font-size: 14px; color: var(--color-pearl); }
.impact__source { margin-top: 12px; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-moss); }

.journey__chapter { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-track-data-bright); margin: 32px 0 16px; }
.journey__chapter:first-child { margin-top: 0; }

.quests { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 40px; }
@media (max-width: 960px) { .quests { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) { .quests { grid-template-columns: 1fr; } }
.quests .card h3 { font-size: 17px; font-weight: 500; margin-top: 12px; }
.quests .card p { font-size: 14px; margin-top: 8px; }

.about__head { display: flex; gap: 20px; align-items: center; margin-bottom: 20px; }
.about__photo { width: 96px; height: 96px; border-radius: var(--radius-image); border: 1px solid var(--color-slate-edge); object-fit: cover; flex-shrink: 0; }
.about__name { color: var(--color-snow); font-size: 18px; font-weight: 500; }
.about__title { color: var(--color-moss); font-size: 13px; margin-top: 2px; }

.project-card__figure { margin: 0 0 20px; }
.project-card__figure img { width: 100%; border-radius: var(--radius-image); border: 1px solid var(--color-slate-edge); }
.project-card__figure figcaption { margin-top: 8px; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.015em; color: var(--color-moss); }
.capability__img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; border-radius: var(--radius-image); border: 1px solid var(--color-slate-edge); }
.stack__card-wrap:nth-child(6) { top: 144px; }
.stack__card-wrap:nth-child(7) { top: 156px; }