/* ---------- DESIGN TOKENS (light theme = default) ---------- */
:root {
  /* Colors — edit these to re-skin the whole site */
  --bg:        #ffffff;
  --fg:        #1a1a1a;
  --muted:     #6b6b6b;
  --surface:   #f2f2f2;   /* form fields, image placeholders */
  --border:    #e6e6e6;
  --accent:    #ff5151;   /* links, hovers — your one pop of color */
  --btn-bg:    #ff5151;
  --btn-fg:    #ffffff;

  /* Type */
  --font-body: "Epilogue", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-head: var(--font-body);

  /* Scale */
  --maxw: 1024px;
  --gap: 1.5rem;
  --section-y: clamp(4rem, 9vw, 8rem);
  --radius: 10px;

  /* Motion */
  --reveal-dur: 0.7s;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- DARK THEME ----------
   Applied two ways:
   - automatically if the OS prefers dark AND the user hasn't chosen,
   - or explicitly when the toggle sets data-theme="dark".            */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:      #121417;
    --fg:      #f1f3f5;
    --muted:   #9aa0a6;
    --surface: #1e2127;
    --border:  #2a2e35;
    --accent:  #ff5151;
    --btn-bg:  #ff5151;
    --btn-fg:  #ffffff;
  }
}
:root[data-theme="dark"] {
  --bg:      #121417;
  --fg:      #f1f3f5;
  --muted:   #9aa0a6;
  --surface: #1e2127;
  --border:  #2a2e35;
  --accent:  #ff5151;
  --btn-bg:  #ff5151;
  --btn-fg:  #ffffff;
}

/* ---------- RESET / BASE ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
h1, h2, h3 { font-family: var(--font-head); line-height: 1.1; font-weight: 800; }
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 1.25rem; }
.section { padding-block: var(--section-y); }
.section__title { font-size: clamp(2rem, 5vw, 3rem); text-align: center; margin-bottom: 3rem; }

/* skip link for keyboard users */
.skip-link { position: absolute; left: -9999px; }
.skip-link:focus { left: 1rem; top: 1rem; background: var(--btn-bg); color: var(--btn-fg); padding: .5rem 1rem; border-radius: var(--radius); z-index: 200; }

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-block;
  padding: 0.9rem 2rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; pointer-events: none; }
.btn:hover { opacity: 0.88; transform: translateY(-2px); }

/* ---------- NAV ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 1rem;
}
.nav__brand { color: var(--fg); font-weight: 800; font-size: 1.1rem; display: flex; align-items: center; }
.nav__logo { height: 40px; width: auto; display: block; }
.nav__right { display: flex; align-items: center; gap: 1.5rem; }
.nav__links { display: flex; align-items: center; gap: 1.5rem; list-style: none; }
.nav__links a { color: var(--fg); font-weight: 500; transition: color 0.2s ease; }
.nav__links a:hover { color: var(--accent); }

/* theme toggle */
.theme-toggle {
  background: none; border: 1px solid var(--border); color: var(--fg);
  width: 38px; height: 38px; border-radius: 50%; cursor: pointer;
  display: grid; place-items: center; transition: border-color 0.2s ease;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: block; }
}

/* hamburger */
.nav__toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 6px;
}
.nav__toggle span { width: 24px; height: 2px; background: var(--fg); border-radius: 2px; transition: transform 0.3s ease, opacity 0.3s ease; }
.nav__toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav__toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- HERO / INTRO ---------- */
.hero { display: grid; grid-template-columns: 1fr 1fr; gap: var(--gap); align-items: center; }
.hero__eyebrow { font-weight: 700; margin-bottom: 0.75rem; }
.hero__name { font-size: clamp(2.5rem, 7vw, 4.5rem); margin-bottom: 1.25rem; max-width: 5ch; }
.hero__bio { color: var(--muted); max-width: 36ch; margin-bottom: 2rem; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__photo { justify-self: center; }

/* image placeholder (gray box w/ icon) — replace with a real <img> later */
.placeholder {
  background: var(--surface);
  border-radius: var(--radius);
  display: grid; place-items: center;
  color: var(--muted);
  aspect-ratio: 1 / 1; width: 100%; max-width: 360px;
}
.placeholder svg { width: 64px; height: 64px; opacity: 0.5; }

/* ---------- ABOUT ---------- */
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 5rem); align-items: center; }
.about__lead { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-bottom: 2rem; }
.about__body { color: var(--fg); }
.about__body p + p { margin-top: 1rem; }

/* ---------- PROJECTS ---------- */
.project { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1.5rem, 4vw, 3.5rem); align-items: center; margin-bottom: clamp(3rem, 7vw, 6rem); }
.project:last-child { margin-bottom: 0; }
/* Alternate image side by row. Odd = image left, even = image right.
   nth-of-type (not nth-child) because the <h2> title is a sibling. */
.project:nth-of-type(odd)  .project__media { order: 0; }
.project:nth-of-type(odd)  .project__body  { order: 1; }
.project:nth-of-type(even) .project__media { order: 1; }
.project:nth-of-type(even) .project__body  { order: 0; }
.project__media .placeholder { max-width: none; aspect-ratio: 4 / 3; }
.project__title { font-size: 1.5rem; margin-top: 1.25rem; }
.project__desc { color: var(--muted); margin-top: 0.5rem; }
.project__body { color: var(--fg); }
.project__body p + p { margin-top: 1rem; }

/* ---------- CONTACT ---------- */
.contact__grid { display: grid; grid-template-columns: 1fr; gap: 2rem; align-items: start; max-width: 600px; margin-inline: auto; }
.contact__lead { font-size: clamp(1.8rem, 4vw, 2.5rem); margin-bottom: 2rem; text-align: center; }
.contact__text { color: var(--fg); }
.contact__text p + p { margin-top: 1rem; }
.form { display: flex; flex-direction: column; gap: 1rem; }
.form input, .form textarea {
  width: 100%; font: inherit; padding: 1rem;
  background: var(--surface); color: var(--fg);
  border: 1px solid transparent; border-radius: var(--radius);
  transition: border-color 0.2s ease;
}
.form input::placeholder, .form textarea::placeholder { color: var(--muted); }
.form input:focus, .form textarea:focus { outline: none; border-color: var(--accent); }
.form textarea { resize: vertical; min-height: 120px; }
.form .btn { margin-top: 0.5rem; align-self: flex-start; }
.honeypot { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ---------- FOOTER ---------- */
.footer { border-top: 1px solid var(--border); padding-block: 2rem; }
.footer__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer p { color: var(--muted); }
.footer a { color: var(--muted); text-decoration: underline; }
.footer a:hover { color: var(--accent); }

/* ---------- TOAST NOTIFICATIONS ---------- */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 999;
  padding: 0.85rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: .95rem;
  white-space: nowrap;
  box-shadow: 0 4px 24px rgba(0,0,0,0.12);
  animation: toast-in 0.3s var(--ease), toast-out 0.4s var(--ease) 4s forwards;
}
.toast--ok  { background: #e6f7ef; color: #0a6b46; }
.toast--err { background: #fdecec; color: #a11; }
@keyframes toast-in  { from { opacity: 0; transform: translateX(-50%) translateY(12px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }
@keyframes toast-out { from { opacity: 1; } to { opacity: 0; pointer-events: none; } }

/* ---------- SCROLL REVEAL ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity var(--reveal-dur) var(--ease), transform var(--reveal-dur) var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- RESPONSIVE ---------- */
@media (max-width: 768px) {
  .hero, .about__grid, .contact__grid { grid-template-columns: 1fr; }
  .hero__photo { justify-self: start; margin-top: 1rem; }
  .project { grid-template-columns: 1fr; }
  .project:nth-of-type(even) .project__media { order: 0; }  /* no flip when stacked */

  /* nav becomes a drawer */
  .nav__toggle { display: flex; }
  .nav__links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg);
    padding: 0.5rem 1.25rem 1rem;
    /* collapsed by default */
    max-height: 0; overflow: hidden; padding-block: 0;
    transition: max-height 0.3s ease, padding 0.3s ease;
  }
  .nav__links.open { max-height: 320px; padding-block: 0.5rem 1rem; }
  .nav__links li { width: 100%; }
  .nav__links a { display: block; padding: 0.65rem 0; width: 100%; }

  .about__grid--flip > :first-child { order: 0; }
  .about__grid--flip > :last-child  { order: 0; }
}

@media (min-width: 769px) {
  .about__grid--flip > :first-child { order: 2; }
  .about__grid--flip > :last-child  { order: 1; }
}

/* respect reduced-motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover { transform: none; }
}

/* Mobile View Buttons */
@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; text-align: center; }
}

/* ---------- TYPEWRITER ---------- */
.typewriter {
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--accent);
  width: 0;
  padding-bottom: 2px;
  animation: typing 2s steps(40, end) 0.5s forwards,
             blink 0.75s step-end infinite;
}
@keyframes typing { from { width: 0; } to { width: var(--tw-width, 100%); } }
@keyframes blink  { from, to { border-color: transparent; } 50% { border-color: var(--accent); } }