/* ============================================================
   Marcos Cherem — portfolio
   Dark-first, lavender accent. Light theme via [data-theme="light"].
   ============================================================ */

:root {
  --bg: #191f2e;
  --bg-2: #1d2436;
  --card: #222a3d;
  --card-hover: #273049;
  --border: #2c3650;
  --text: #c6cdda;
  --text-dim: #8f97a8;
  --heading: #eef0fb;
  --accent: #b3b7f7;
  --accent-2: #8b8fe6;
  --accent-soft: rgba(155, 160, 240, 0.14);
  --shadow: 0 18px 40px -20px rgba(0, 0, 0, 0.65);
  --radius: 16px;
  --maxw: 980px;
}

[data-theme="light"] {
  --bg: #f5f6fb;
  --bg-2: #eef0f8;
  --card: #ffffff;
  --card-hover: #ffffff;
  --border: #e2e5f0;
  --text: #43485a;
  --text-dim: #7a8195;
  --heading: #272b3d;
  --accent: #6b6fd6;
  --accent-2: #5559c4;
  --accent-soft: rgba(107, 111, 214, 0.1);
  --shadow: 0 18px 40px -24px rgba(60, 66, 120, 0.28);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: "Poppins", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background 0.35s ease, color 0.35s ease;
}

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

/* ---------- NAV ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px clamp(20px, 6vw, 80px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.35s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }

.logo {
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.5px;
  color: var(--heading);
}
.logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 34px);
}
.nav-links a {
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}
.nav-links a:hover { color: var(--accent); }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--accent);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.theme-toggle:hover { background: var(--accent-soft); transform: translateY(-1px); }
.theme-toggle svg { fill: currentColor; stroke: currentColor; }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ---------- LAYOUT ---------- */
main { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(20px, 6vw, 40px); }

.section { padding: 70px 0; }

.section-title {
  text-align: center;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 48px;
  text-shadow: 0 0 26px var(--accent-soft);
}

/* ---------- HERO ---------- */
.hero {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  padding: 60px 0 40px;
}

.avatar {
  position: relative;
  width: 150px;
  height: 150px;
  margin: 0 auto 34px;
}
.avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--accent-soft);
}
.monogram {
  display: none; /* shown only if the photo fails to load (see img onerror) */
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  font-size: 3.4rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: 1px;
  background: linear-gradient(140deg, var(--accent-2), #6d72c9 60%, #4b4f9e);
  box-shadow: 0 12px 34px -10px var(--accent-2);
}

.hero-hi {
  font-size: clamp(1.9rem, 6vw, 2.9rem);
  font-weight: 800;
  color: var(--heading);
  line-height: 1.15;
}
.hero-hi .accent { color: var(--accent); }

.hero-title {
  font-size: clamp(1.4rem, 5vw, 2.3rem);
  font-weight: 700;
  color: var(--heading);
  margin: 6px 0 26px;
  min-height: 1.4em;
}
.caret {
  color: var(--accent);
  font-weight: 400;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-intro { color: var(--text-dim); font-size: 1rem; }

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin-top: 34px;
}

.btn {
  display: inline-block;
  padding: 11px 26px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.btn:hover { background: var(--accent); color: var(--bg); transform: translateY(-2px); }

.icon-link {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  color: var(--text-dim);
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}
.icon-link svg { fill: currentColor; }
.icon-link svg.stroke { fill: none; stroke: currentColor; }
.icon-link:hover { color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }

/* ---------- PROJECTS ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 26px;
  text-align: center;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}
.card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-2);
  background: var(--card-hover);
  box-shadow: var(--shadow);
}
.card h3 {
  color: var(--accent);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.card p { color: var(--text-dim); font-size: 0.92rem; flex-grow: 1; }
.card .tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 14px;
  margin-top: 18px;
}
.card .tags span { color: var(--accent-2); font-size: 0.78rem; font-weight: 600; }
.card .meta {
  margin-top: 16px;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  opacity: 0.75;
}

/* ---------- SKILLS ---------- */
.pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  max-width: 760px;
  margin: 0 auto;
}
.pill {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text);
  transition: transform 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.pill:hover { transform: translateY(-3px); border-color: var(--accent); color: var(--accent); }

/* ---------- TIMELINE ---------- */
.timeline { position: relative; padding: 10px 0; }
.timeline::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
  background: var(--border);
}

.tl-item {
  position: relative;
  width: 50%;
  padding: 0 40px 44px;
  display: flex;
}
.tl-item:nth-child(odd) { left: 0; justify-content: flex-end; text-align: left; }
.tl-item:nth-child(even) { left: 50%; }

.tl-dot {
  position: absolute;
  top: 8px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent-2);
  z-index: 2;
}
.tl-item:nth-child(odd) .tl-dot { right: -7.5px; }
.tl-item:nth-child(even) .tl-dot { left: -7.5px; }

.tl-date {
  position: absolute;
  top: 6px;
  font-weight: 600;
  color: var(--accent);
  font-size: 0.9rem;
  white-space: nowrap;
}
.tl-item:nth-child(odd) .tl-date { left: calc(100% + 34px); }
.tl-item:nth-child(even) .tl-date { right: calc(100% + 34px); }

.tl-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  width: 100%;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.tl-card:hover { border-color: var(--accent-2); transform: translateY(-3px); }
.tl-card h3 { color: var(--heading); font-size: 1.08rem; font-weight: 700; }
.tl-card .role { color: var(--accent); font-weight: 600; font-size: 0.9rem; margin-bottom: 10px; }
.tl-card p { color: var(--text-dim); font-size: 0.9rem; }
.tl-card .more { display: none; margin-top: 10px; }
.tl-card.open .more { display: block; }
.read-more {
  background: none;
  border: none;
  color: var(--accent);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  margin-top: 10px;
  padding: 0;
}
.read-more:hover { text-decoration: underline; }

/* ---------- CONTACT ---------- */
.contact { text-align: center; }
.contact-lead { max-width: 520px; margin: 0 auto 30px; color: var(--text-dim); }

/* ---------- FOOTER ---------- */
.footer { text-align: center; padding: 50px 20px 60px; color: var(--text-dim); font-size: 0.85rem; }
.footer .muted { color: var(--accent-2); margin-top: 6px; opacity: 0.85; }

/* ---------- REVEAL ANIMATION ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 720px) {
  .timeline::before { left: 20px; }
  .tl-item, .tl-item:nth-child(even) { width: 100%; left: 0; padding: 0 0 60px 52px; justify-content: flex-start; }
  .tl-item:nth-child(odd) .tl-dot,
  .tl-item:nth-child(even) .tl-dot { left: 13px; right: auto; }
  .tl-date { position: static; display: block; margin-bottom: 8px; }
  .tl-item:nth-child(odd) .tl-date,
  .tl-item:nth-child(even) .tl-date { left: auto; right: auto; }
  .nav { padding: 16px 20px; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 0.85rem; }
}