/* ============================
   Tokens (PRD "Look" section)
   ============================ */
:root {
  /* palette */
  --color-blue: #2F6FED;
  --color-light-blue: #7FC7E8;
  --color-green: #4FBFA0;
  --color-yellow: #FFD866;
  --color-light-orange: #FFB067;
  --color-orange: #FF7A45;

  /* gradient, cool to warm */
  --gradient-sunset: linear-gradient(
    135deg,
    var(--color-blue),
    var(--color-light-blue),
    var(--color-green),
    var(--color-yellow),
    var(--color-light-orange),
    var(--color-orange)
  );

  /* base */
  --color-bg: #FFFDF9;
  --color-surface: #FFFFFF;
  --color-text: #1F2430;
  --color-text-muted: #5B6270;
  --color-border: #E9E4DC;

  /* type */
  --font-base: system-ui, -apple-system, "Segoe UI", sans-serif;

  /* layout */
  --max-width: 72rem;
  --radius: 0.75rem;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
}

/* ============================
   Reset / base
   ============================ */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

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

a {
  color: var(--color-blue);
}

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.placeholder {
  color: var(--color-text-muted);
  font-style: italic;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-2);
  background: var(--color-surface);
}

/* ============================
   Header / nav
   ============================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: var(--space-2) var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
}

.nav__links {
  list-style: none;
  display: flex;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
}

.nav__links a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}

.nav__links a:hover,
.nav__links a[aria-current="page"] {
  border-bottom-color: var(--color-orange);
}

@media (max-width: 640px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-2) var(--space-3);
    gap: var(--space-2);
    display: none;
  }

  .nav__links.is-open {
    display: flex;
  }
}

/* ============================
   Hero
   ============================ */
.hero {
  padding: var(--space-5) 0 var(--space-4);
  background: var(--gradient-sunset);
  color: #fff;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  margin: 0 0 var(--space-2);
}

.hero p {
  max-width: 40rem;
  font-size: 1.15rem;
}

/* ============================
   Sections
   ============================ */
.section {
  padding: var(--space-5) 0;
}

.section--muted {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.section__heading h2 {
  margin: 0;
}

.section__link {
  white-space: nowrap;
  font-weight: 600;
  text-decoration: none;
}

/* ============================
   Timeline (accordion)
   ============================ */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.timeline__item {
  border-bottom: 1px solid var(--color-border);
}

.timeline__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  background: none;
  border: none;
  text-align: left;
  font: inherit;
  font-weight: 600;
  padding: var(--space-3) var(--space-1);
  cursor: pointer;
  color: var(--color-text);
}

.timeline__date {
  color: var(--color-text-muted);
  font-weight: 400;
  font-size: 0.9rem;
}

.timeline__icon {
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.timeline__trigger[aria-expanded="true"] .timeline__icon {
  transform: rotate(45deg);
}

.timeline__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}

.timeline__panel[data-open="true"] {
  grid-template-rows: 1fr;
}

.timeline__panel-inner {
  overflow: hidden;
}

.timeline__panel p {
  padding: 0 var(--space-1) var(--space-3);
  margin: 0;
  color: var(--color-text-muted);
}

/* ============================
   Cards (projects / preview grids)
   ============================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--space-3);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: var(--space-3);
}

.card h3 {
  margin-top: 0;
}

.card__meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ============================
   Gallery
   ============================ */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
  gap: var(--space-3);
}

.gallery-item img,
.gallery-item .placeholder-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius);
}

.placeholder-img {
  background: var(--gradient-sunset);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  text-align: center;
  padding: var(--space-2);
}

.gallery-item figcaption {
  margin-top: var(--space-1);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ============================
   Contact
   ============================ */
.contact-list {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 1.1rem;
}

.button {
  display: inline-block;
  background: var(--gradient-sunset);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
}

/* ============================
   Footer
   ============================ */
.site-footer {
  padding: var(--space-3) 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* ============================
   Scroll reveal
   ============================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}