/* ================================================
   D1Code Portfolio — Styles
   ================================================ */

/* --- Variables --- */
:root {
  --bg-0:          #07071a;
  --bg-1:          #0a0a20;
  --bg-card:       #0e0e28;
  --bg-card-hover: #121230;

  --accent:        #00d4ff;
  --accent-rgb:    0, 212, 255;
  --accent-dim:    rgba(0, 212, 255, 0.1);
  --accent-glow:   0 0 40px rgba(0, 212, 255, 0.2);
  --accent-border: rgba(0, 212, 255, 0.22);
  --accent-2:      #a855f7;
  --accent-2-rgb:  168, 85, 247;
  --accent-2-dim:  rgba(168, 85, 247, 0.1);
  --accent-2-border: rgba(168, 85, 247, 0.25);

  --text-1:  #f0f4ff;
  --text-2:  #8892b0;
  --text-3:  #44506a;

  --border:  rgba(255, 255, 255, 0.07);

  --radius:    12px;
  --radius-lg: 20px;
  --ease:      0.3s ease;

  --font-body:    'Inter', system-ui, sans-serif;
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;

  --nav-h:         68px;
  --section-pad:   clamp(80px, 10vw, 140px);
  --container:     min(1180px, 100% - 48px);
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.7;
  overflow-x: hidden;
}
body.loading { overflow: hidden; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
ul { list-style: none; }
input, textarea, button { font: inherit; }
textarea { resize: vertical; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.mono { font-family: var(--font-mono); }

/* --- Utilities --- */
.container {
  width: var(--container);
  margin-inline: auto;
}

.highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.inline-code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.1em 0.45em;
  border-radius: 5px;
  border: 1px solid var(--accent-border);
}

/* ================================================
   Loader
   ================================================ */
.loader {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--bg-0);
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
.loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

/* Wrapper: top edge placed so the logo's center sits at 50vh —
   identical to .hero__watermark, keeping the transition seamless */
.loader__inner {
  position: absolute;
  top: calc(50% - min(240px, 40vw));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.loader__logo {
  width: min(480px, 80vw);
  height: min(480px, 80vw);
  object-fit: contain;
  filter: invert(1);
  opacity: 0;
  /* Pull the bar up past the PNG's bottom whitespace (~32% of image height) */
  margin-bottom: calc(min(480px, 80vw) * -0.32);
  animation: loaderLogoIn 0.5s ease 0.1s forwards;
}
@keyframes loaderLogoIn { to { opacity: 0.78; } }

.loader__bar-wrap {
  width: min(220px, 45vw);
  position: relative;
  z-index: 1;
}
.loader__bar {
  height: 1.5px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.loader__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
  animation: loaderFill 1.1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}
@keyframes loaderFill { to { width: 100%; } }

/* ================================================
   Header / Navigation
   ================================================ */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--ease), backdrop-filter var(--ease),
              border-bottom var(--ease), transform 0.35s ease;
}
.header.scrolled {
  background: rgba(7, 7, 26, 0.82);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
}
.header.hidden { transform: translateY(-100%); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  transition: opacity var(--ease);
  line-height: 1;
}
.logo:hover { opacity: 0.8; }
.logo__d1   { color: var(--accent); }
.logo__code { color: var(--text-1); }

/* ---- Logo Badge (tilde mark) ---- */
.logo-badge {
  border-radius: 50%;
  border: 1.5px solid var(--accent-border);
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
  transition: box-shadow var(--ease), border-color var(--ease);
}
.logo-badge--sm {
  width: 34px;
  height: 34px;
}
.logo-badge--lg {
  width: 90px;
  height: 90px;
  border-width: 1.5px;
  box-shadow:
    0 0 24px rgba(var(--accent-rgb), 0.18),
    0 0 60px rgba(var(--accent-rgb), 0.07);
  margin-bottom: 32px;
}
.logo-badge__img {
  width: 64%;
  height: 64%;
  object-fit: contain;
  /* invert makes black→white, screen blend makes the white square bg disappear
     against the dark circle background, leaving only the tilde shape */
  filter: invert(1);
  mix-blend-mode: screen;
}
.logo-badge--lg .logo-badge__img {
  filter: invert(1) drop-shadow(0 0 8px rgba(var(--accent-rgb), 0.7));
}

/* Nav link */
.nav__links {
  display: flex;
  gap: 2.5rem;
}
.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color var(--ease);
  position: relative;
}
.nav__link::after {
  content: '';
  position: absolute;
  bottom: -5px; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width var(--ease);
}
.nav__link:hover { color: var(--text-1); }
.nav__link:hover::after { width: 100%; }

/* Hamburger */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  z-index: 200;
}
.bar {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-1);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}
.nav__toggle.open .bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open .bar:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav__toggle.open .bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 99;
  background: var(--bg-1);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}
.mobile-menu.open { opacity: 1; visibility: visible; }
.mobile-menu__links {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  text-align: center;
}
.mobile-menu__links a {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 8vw, 3.2rem);
  font-weight: 700;
  color: var(--text-2);
  transition: color var(--ease);
}
.mobile-menu__links a:hover { color: var(--accent); }

/* ================================================
   Buttons
   ================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--ease);
  white-space: nowrap;
  border: 1px solid transparent;
}
.btn--primary {
  background: var(--accent);
  color: var(--bg-0);
  border-color: var(--accent);
}
.btn--primary:hover {
  filter: brightness(1.12);
  box-shadow: var(--accent-glow);
  transform: translateY(-2px);
}
.btn--outline {
  background: transparent;
  color: var(--text-1);
  border-color: var(--border);
}
.btn--outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.btn--ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent-border);
}
.btn--ghost:hover {
  background: var(--accent-dim);
  transform: translateY(-2px);
}
.btn--full { width: 100%; justify-content: center; }

/* ================================================
   Hero
   ================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.hero__watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(480px, 80vw);
  height: min(480px, 80vw);
  object-fit: contain;
  filter: invert(1);
  opacity: 0.055;
  pointer-events: none;
  user-select: none;
}
.hero__canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
}
.hero__gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 50% 0%,   rgba(var(--accent-rgb), 0.07) 0%, transparent 70%),
    radial-gradient(ellipse 45% 45% at 85% 80%,  rgba(var(--accent-2-rgb), 0.05) 0%, transparent 60%),
    radial-gradient(ellipse 30% 30% at 10% 60%,  rgba(var(--accent-rgb), 0.04) 0%, transparent 60%);
  pointer-events: none;
}
.hero__content {
  position: relative;
  z-index: 2;
  max-width: 860px;
  padding-top: var(--nav-h);
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: 100px;
  padding: 6px 16px;
  margin-bottom: 32px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.hero__badge-dot {
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.4; transform: scale(0.75); }
}
.hero__title {
  font-size: clamp(2.4rem, 6vw, 5rem);
  line-height: 1.1;
  margin-bottom: 24px;
}
.hero__em { font-style: normal; color: var(--accent); }
.hero__typed { color: var(--accent-2); display: inline; }
.hero__cursor {
  color: var(--accent-2);
  animation: blink 0.85s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

.hero__sub {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  color: var(--text-2);
  margin-bottom: 44px;
  max-width: 580px;
}
.hero__actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero__scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-3);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color var(--ease);
  z-index: 2;
}
.hero__scroll-hint:hover { color: var(--accent); }
.hero__scroll-arrow { animation: bounceY 2s ease-in-out infinite; }
@keyframes bounceY {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(6px); }
}

/* ================================================
   Sections (shared)
   ================================================ */
.section { padding-block: var(--section-pad); }
.section:nth-child(even) { background: var(--bg-1); }

.section__header { margin-bottom: clamp(48px, 7vw, 72px); }
.section__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.section__title { font-size: clamp(2rem, 4.5vw, 3.2rem); }

/* ================================================
   About
   ================================================ */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 7vw, 88px);
  align-items: start;
}
.about__text p {
  color: var(--text-2);
  margin-bottom: 1.2rem;
  font-size: 1.05rem;
}
.about__text strong { color: var(--text-1); font-weight: 600; }
.about__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}
.chip {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text-2);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 4px 13px;
  border-radius: 100px;
  transition: all var(--ease);
}
.chip:hover { border-color: var(--accent); color: var(--accent); }

/* Hex card */
.hex-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}
.hex-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.5;
}
.hex-card__top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.hex-card__label {
  font-size: 0.72rem;
  color: var(--text-3);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.hex-card__uni { font-size: 0.82rem; color: var(--text-3); }
.hex-card__main {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 20px;
}
.hex-card__char {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  color: var(--text-1);
  line-height: 1;
}
.hex-card__eq { font-size: 2rem; color: var(--text-3); }
.hex-card__hex { font-size: clamp(2rem, 4vw, 3rem); color: var(--text-2); }
.hex-card__hex em {
  font-style: normal;
  color: var(--accent);
  text-shadow: 0 0 24px rgba(var(--accent-rgb), 0.55);
}
.hex-card__foot {
  font-size: 0.78rem;
  color: var(--text-3);
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

/* Skills */
.skills { display: flex; flex-direction: column; gap: 20px; }
.skill__header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 9px;
  font-size: 0.9rem;
}
.skill__header span:first-child { color: var(--text-2); }
.skill__header span:last-child  { color: var(--accent); font-size: 0.8rem; }
.skill__track {
  height: 4px;
  background: var(--bg-card);
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.skill__fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 4px;
  transition: width 1.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ================================================
   Projects
   ================================================ */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(340px, 100%), 1fr));
  gap: 24px;
  margin-bottom: 48px;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: all var(--ease);
  position: relative;
  overflow: hidden;
}
/* Mouse-follow glow */
.project-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at var(--mx, 50%) var(--my, 50%),
    rgba(var(--accent-rgb), 0.05) 0%, transparent 60%
  );
  opacity: 0;
  transition: opacity var(--ease);
  pointer-events: none;
}
.project-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-5px);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.35), 0 0 0 1px var(--accent-border);
}
.project-card:hover::after { opacity: 1; }

.project-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.project-card__icon {
  width: 46px; height: 46px;
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}
.project-card__links { display: flex; gap: 14px; }
.icon-link { color: var(--text-3); transition: color var(--ease); display: flex; }
.icon-link:hover { color: var(--accent); }

.project-card__title { font-size: 1.15rem; color: var(--text-1); }
.project-card__desc  { font-size: 0.88rem; color: var(--text-2); flex: 1; line-height: 1.65; }
.project-card__stack {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 4px;
}
.project-card__stack span {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent-border);
  padding: 3px 10px;
  border-radius: 5px;
}
.projects__more { text-align: center; }

/* ================================================
   Blog
   ================================================ */
.blog__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: 24px;
}
.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: all var(--ease);
}
.blog-card:hover {
  border-color: var(--accent-2-border);
  transform: translateY(-4px);
}
.blog-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.blog-card__tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-2);
  background: var(--accent-2-dim);
  border: 1px solid var(--accent-2-border);
  padding: 3px 10px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.blog-card__date { font-size: 0.8rem; color: var(--text-3); }
.blog-card__title   { font-size: 1.05rem; color: var(--text-1); }
.blog-card__excerpt { font-size: 0.875rem; color: var(--text-2); flex: 1; line-height: 1.65; }
.blog-card__read    { font-size: 0.85rem; color: var(--accent); font-weight: 500; }

/* ================================================
   Contact
   ================================================ */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: clamp(40px, 7vw, 88px);
  align-items: start;
}
.contact__info p {
  color: var(--text-2);
  font-size: 1.05rem;
  margin-bottom: 36px;
  line-height: 1.75;
}
.contact__links { display: flex; flex-direction: column; gap: 18px; }
.contact__item {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text-2);
  font-size: 0.9rem;
  transition: color var(--ease);
}
.contact__item svg { flex-shrink: 0; color: var(--accent); }
.contact__item:hover { color: var(--accent); }

/* Form */
.contact__form { display: flex; flex-direction: column; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label {
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--text-2);
  letter-spacing: 0.04em;
}
.form-group input,
.form-group textarea {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 13px 16px;
  color: var(--text-1);
  font-size: 0.95rem;
  transition: border-color var(--ease), box-shadow var(--ease);
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-3); }
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), 0.1);
}

/* ================================================
   Footer
   ================================================ */
.footer {
  border-top: 1px solid var(--border);
  padding-block: 40px;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer__copy { font-size: 0.85rem; color: var(--text-3); }
.footer__links { display: flex; gap: 24px; }
.footer__links a {
  font-size: 0.85rem;
  color: var(--text-3);
  transition: color var(--ease);
}
.footer__links a:hover { color: var(--accent); }

/* ================================================
   Scroll Reveal
   ================================================ */
.reveal-up {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity  0.7s ease var(--delay, 0s),
    transform 0.7s ease var(--delay, 0s);
}
.reveal-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ================================================
   Responsive
   ================================================ */
@media (max-width: 900px) {
  .about__grid,
  .contact__grid { grid-template-columns: 1fr; }
  .about__aside { max-width: 520px; }
}

@media (max-width: 768px) {
  :root { --nav-h: 62px; }
  .nav__links  { display: none; }
  .nav__toggle { display: flex; }
  .hero__sub br { display: none; }
  .footer__inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

@media (max-width: 480px) {
  :root { --container: min(1180px, 100% - 32px); }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .hex-card__main { gap: 12px; }
  .hex-card { padding: 22px 24px; }
}

/* ================================================
   Accessibility — Reduced Motion
   ================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal-up { opacity: 1; transform: none; }
}