/* ============================================================
   CALVIN SAPUTRA — PORTFOLIO
   Minimalist Luxury — Black / White / Gold-line accents
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Color */
  --black: #0a0a0a;
  --black-soft: #141414;
  --white: #fafaf8;
  --gray-100: #e7e5e1;
  --gray-300: #b8b5af;
  --gray-500: #7a776f;
  --gray-700: #46443f;
  --gold: #c8a876;
  --gold-soft: rgba(200, 168, 118, 0.35);

  /* Surface */
  --bg: var(--white);
  --fg: var(--black);
  --line: rgba(10, 10, 10, 0.12);
  --line-strong: rgba(10, 10, 10, 0.22);

  /* Type */
  --font-display: "Fraunces", "Georgia", serif;
  --font-body: "Inter", -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;
  --space-7: 9rem;

  /* Layout */
  --rail-width: 96px;
  --max-width: 1240px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

/* ---------- Grain overlay (subtle texture, removes "flat AI" feel) ---------- */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 200;
  opacity: 0.025;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ---------- Reveal-on-scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.8s var(--ease),
    transform 0.8s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  mix-blend-mode: difference;
}

.nav__mark {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--white);
}

.nav__links {
  display: flex;
  gap: var(--space-4);
}

.nav__link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--white);
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  position: relative;
  padding-bottom: 0.3em;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0%;
  height: 1px;
  background: currentColor;
  transition: width 0.4s var(--ease);
}

.nav__link:hover::after,
.nav__link:focus-visible::after {
  width: 100%;
}

.nav__link--active {
  color: var(--gold);
}

.nav__link--active::after {
  width: 100%;
  background: var(--gold);
}

.nav__num {
  opacity: 0.45;
  font-size: 0.7rem;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 28px;
  height: 28px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 110;
}

.nav__toggle span {
  display: block;
  height: 1px;
  width: 100%;
  background: var(--white);
  mix-blend-mode: difference;
  transition:
    transform 0.3s var(--ease),
    opacity 0.3s var(--ease);
}

.nav__toggle[aria-expanded="true"] span:first-child {
  transform: translateY(3.5px) rotate(45deg);
}
.nav__toggle[aria-expanded="true"] span:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* Mobile menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--black);
  z-index: 105;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-5);
  transform: translateY(-100%);
  visibility: hidden;
  transition:
    transform 0.5s var(--ease),
    visibility 0.5s;
}

.mobile-menu.is-open {
  transform: translateY(0);
  visibility: visible;
}

.mobile-menu__link {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 400;
  color: var(--white);
  letter-spacing: -0.01em;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--black);
  color: var(--white);
  overflow: hidden;
}

.hero__lines {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__svg {
  width: 100%;
  height: 100%;
}

.ln {
  stroke: rgba(250, 250, 248, 0.14);
  stroke-width: 0.1;
  vector-effect: non-scaling-stroke;
}

.ln--a {
  stroke: rgba(250, 250, 248, 0.1);
}

.ln--b {
  stroke: rgba(250, 250, 248, 0.06);
}

.dot {
  fill: var(--gold);
  opacity: 0.7;
}

/* ---------- Signature element: radiating line fan ----------
   Inspired by the intersecting line artwork on the Aria 2021
   shell — a cluster of straight lines fanning from a single
   vertex, varying in length, weight, and warmth. Used as a
   corner accent, never as a literal earphone shape. */

.fan__svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.fan__ln {
  fill: none;
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  stroke-linecap: round;
}

.fan__ln--a {
  stroke: rgba(250, 250, 248, 0.16);
}

.fan__ln--b {
  stroke: rgba(250, 250, 248, 0.08);
}

.fan__ln--c {
  stroke: var(--gold);
  opacity: 0.75;
}

.fan__ln--cross {
  stroke: var(--gold);
  opacity: 0.4;
  stroke-width: 1.4;
}

.fan__ln--cross-soft {
  stroke: rgba(250, 250, 248, 0.1);
}

.fan__dot {
  fill: var(--gold);
  opacity: 0.85;
}

.hero__fan {
  position: absolute;
  right: 0;
  bottom: 0;
  width: min(50vw, 560px);
  height: min(50vw, 560px);
  z-index: 0;
  pointer-events: none;
  opacity: 1;
}

@media (max-width: 680px) {
  .hero__fan {
    width: 82vw;
    height: 82vw;
    opacity: 0.75;
  }
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
}

.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-300);
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.eyebrow__line {
  display: inline-block;
  width: 48px;
  height: 1px;
  background: var(--gold);
  margin-top: 0.6em;
  flex-shrink: 0;
}

.hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(3.2rem, 13vw, 8.5rem);
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-4);
}

.hero__title--outline {
  font-style: italic;
  font-weight: 300;
  color: transparent;
  -webkit-text-stroke: 1px var(--white);
  text-stroke: 1px var(--white);
}

.hero__lede {
  max-width: 46ch;
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.75;
  color: var(--gray-100);
  margin-bottom: var(--space-5);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  padding-top: var(--space-4);
  padding-bottom: var(--space-5);
  border-top: 1px solid rgba(250, 250, 248, 0.12);
  margin-bottom: var(--space-4);
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.4em;
}

.hero__meta-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gray-500);
}

.hero__meta-value {
  font-size: 0.95rem;
  color: var(--gray-100);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.95em 1.8em;
  border: 1px solid currentColor;
  transition:
    background 0.35s var(--ease),
    color 0.35s var(--ease),
    transform 0.35s var(--ease);
}

.btn--primary {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: transparent;
  color: var(--white);
  transform: translateY(-2px);
}

.btn--primary svg {
  transition: transform 0.35s var(--ease);
}

.btn--primary:hover svg {
  transform: translateX(3px);
}

.btn--ghost {
  color: var(--white);
  border-color: rgba(250, 250, 248, 0.3);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--white);
  background: rgba(250, 250, 248, 0.06);
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-4);
  left: var(--space-4);
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-500);
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--gold), transparent);
  animation: scrollline 2.4s ease-in-out infinite;
}

@keyframes scrollline {
  0%,
  100% {
    transform: scaleY(1);
    transform-origin: top;
  }
  50% {
    transform: scaleY(0.4);
    transform-origin: top;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero__scroll-line {
    animation: none;
  }
}

/* ============================================================
   SECTION LAYOUT — shared rail + content grid
   ============================================================ */
.section {
  position: relative;
  display: grid;
  grid-template-columns: var(--rail-width) 1fr;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-6) var(--space-4);
  border-top: 1px solid var(--line);
}

.section__rail {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding-top: 0.3em;
}

.rail__label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gray-500);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  white-space: nowrap;
}

.rail__index {
  display: none;
}

.section__content {
  min-width: 0;
}

.section__heading {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 5.4vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-5);
  max-width: 18ch;
}

.section__heading em {
  font-style: italic;
  color: var(--gold);
}

.section__intro {
  max-width: 56ch;
  font-size: 1rem;
  color: var(--gray-700);
  margin-top: calc(var(--space-5) * -0.55);
  margin-bottom: var(--space-5);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  max-width: 78ch;
  margin-bottom: var(--space-6);
}

.about__text {
  font-size: 1rem;
  color: var(--gray-700);
  line-height: 1.85;
}

.about__text strong {
  color: var(--black);
  font-weight: 500;
}

.about__stack {
  border-top: 1px solid var(--line);
  padding-top: var(--space-4);
}

.about__stack-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: var(--space-3);
}

.stack__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em 0.8em;
}

.stack__list li {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 0.55em 1.1em;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  transition:
    border-color 0.3s var(--ease),
    color 0.3s var(--ease);
}

.stack__list li:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* ============================================================
   EXPERIENCE / TIMELINE
   ============================================================ */
.timeline {
  display: flex;
  flex-direction: column;
}

.timeline__item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--line);
}

.timeline__item:first-child {
  border-top: 1px solid var(--line-strong);
}

.timeline__period {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  align-items: flex-start;
}

.timeline__year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-500);
  letter-spacing: 0.02em;
}

.timeline__tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.35em 0.8em;
  border: 1px solid var(--gold-soft);
  color: var(--gold);
  border-radius: 999px;
}

.timeline__role {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.3rem;
  margin-bottom: 0.35em;
}

.timeline__sep {
  color: var(--gray-300);
  font-style: italic;
  margin: 0 0.15em;
}

.timeline__org {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gold);
  letter-spacing: 0.04em;
  margin-bottom: var(--space-2);
}

.timeline__desc {
  font-size: 0.96rem;
  color: var(--gray-700);
  line-height: 1.8;
  max-width: 62ch;
  margin-bottom: var(--space-3);
}

.timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5em;
}

.timeline__tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--gray-500);
  padding: 0.35em 0.75em;
  border: 1px solid var(--line);
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.project-card {
  position: relative;
  background: var(--bg);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  transition: background 0.4s var(--ease);
}

.project-card:hover {
  background: var(--black);
  color: var(--white);
}

.project-card:hover .project-card__desc {
  color: var(--gray-100);
}

.project-card:hover .timeline__tags span,
.project-card:hover .project-card__tags span {
  color: var(--gray-300);
  border-color: rgba(250, 250, 248, 0.18);
}

.project-card:hover .project-card__index {
  color: var(--gold);
}

.project-card__frame {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  width: 22px;
  height: 22px;
  pointer-events: none;
}

.project-card__frame::before,
.project-card__frame::after {
  content: "";
  position: absolute;
  background: var(--line-strong);
  transition: background 0.4s var(--ease);
}

.project-card__frame::before {
  top: 0;
  right: 0;
  width: 100%;
  height: 1px;
}

.project-card__frame::after {
  top: 0;
  right: 0;
  width: 1px;
  height: 100%;
}

.project-card:hover .project-card__frame::before,
.project-card:hover .project-card__frame::after {
  background: var(--gold);
}

.project-card__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--space-2);
}

.project-card__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.3rem;
}

.project-card__index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-300);
  transition: color 0.4s var(--ease);
}

.project-card__desc {
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--gray-700);
  flex-grow: 1;
  transition: color 0.4s var(--ease);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45em;
  padding-top: var(--space-1);
}

.project-card__tags span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  color: var(--gray-500);
  padding: 0.3em 0.7em;
  border: 1px solid var(--line);
  transition:
    color 0.4s var(--ease),
    border-color 0.4s var(--ease);
}

/* ============================================================
   CONTACT
   ============================================================ */
.section--contact {
  border-bottom: 1px solid var(--line);
}

.section--contact .section__content {
  position: relative;
  text-align: left;
}

.contact__lines {
  position: absolute;
  top: 0;
  right: 0;
  width: min(34vw, 320px);
  height: min(34vw, 320px);
  pointer-events: none;
}

.fan__svg--alt .fan__ln--a {
  stroke: var(--line-strong);
}

.fan__svg--alt .fan__ln--b {
  stroke: var(--line);
}

.fan__svg--alt .fan__ln--c {
  stroke: var(--gold);
  opacity: 0.6;
}

.fan__svg--alt .fan__dot {
  fill: var(--gold);
}

.contact__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: var(--space-3);
}

.contact__heading {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  line-height: 1.1;
  margin-bottom: var(--space-3);
}

.contact__heading em {
  font-style: italic;
  color: var(--gold);
}

.contact__text {
  max-width: 46ch;
  color: var(--gray-700);
  font-size: 1rem;
  margin-bottom: var(--space-5);
}

.contact__links {
  display: flex;
  flex-direction: column;
  max-width: 480px;
  border-top: 1px solid var(--line-strong);
}

.contact__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--line);
  transition:
    padding-left 0.35s var(--ease),
    color 0.35s var(--ease);
}

.contact__link:hover,
.contact__link:focus-visible {
  padding-left: var(--space-2);
  color: var(--gold);
}

.contact__link-label {
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.contact__link-value {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--gray-500);
  flex-grow: 1;
  text-align: right;
  padding-right: var(--space-2);
}

.contact__link-arrow {
  transition: transform 0.35s var(--ease);
  flex-shrink: 0;
}

.contact__link:hover .contact__link-arrow {
  transform: translate(3px, -3px);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-4) var(--space-5);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--gray-500);
  letter-spacing: 0.04em;
}

.footer__top {
  transition: color 0.3s var(--ease);
}

.footer__top:hover {
  color: var(--gold);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablet */
@media (max-width: 960px) {
  :root {
    --rail-width: 64px;
  }

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

  .timeline__item {
    grid-template-columns: 140px 1fr;
  }

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

/* Mobile */
@media (max-width: 680px) {
  :root {
    --space-6: 4rem;
    --rail-width: 0;
  }

  .nav {
    padding: var(--space-2) var(--space-3);
  }

  .nav__links {
    display: none;
  }

  .nav__toggle {
    display: flex;
  }

  .hero__inner {
    padding: var(--space-5) var(--space-3) var(--space-6);
  }

  .hero__title {
    font-size: clamp(2.8rem, 18vw, 5rem);
  }

  .hero__meta {
    flex-direction: column;
    gap: var(--space-3);
  }

  .section {
    grid-template-columns: 1fr;
    padding: var(--space-5) var(--space-3);
    gap: var(--space-3);
  }

  .section__rail {
    flex-direction: row;
    align-items: baseline;
    gap: var(--space-2);
    padding-top: 0;
  }

  .rail__label {
    writing-mode: horizontal-tb;
    transform: none;
  }

  .rail__index {
    display: inline;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    color: var(--gray-300);
  }

  .section__heading {
    font-size: clamp(1.9rem, 9vw, 2.6rem);
    max-width: none;
  }

  .section__intro {
    margin-top: 0;
  }

  .timeline__item {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .timeline__period {
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
  }

  .contact__lines {
    width: 42vw;
    height: 42vw;
    opacity: 0.7;
  }

  .contact__links {
    max-width: none;
  }

  .contact__link-value {
    display: none;
  }

  .footer {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
    padding-bottom: var(--space-4);
  }
}

/* Small mobile */
@media (max-width: 380px) {
  .hero__actions {
    flex-direction: column;
    width: 100%;
  }

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

/* ---------- Focus visibility (accessibility) ---------- */
a:focus-visible,
button:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: 3px;
}