/* ===========================================================
   [YOUR NAME] — AI Developer Portfolio
   style.css — variables, layout, components, animations
=========================================================== */

/* ---------- Design Tokens ---------- */
:root{
  /* Surfaces */
  --bg: #0a0e17;
  --bg-alt: #0d1220;
  --surface: #131829;
  --surface-2: #171e33;
  --border: rgba(255,255,255,0.08);
  --border-strong: rgba(255,255,255,0.14);

  /* Text */
  --text-primary: #f2f5fa;
  --text-secondary: rgba(242,245,250,0.66);
  --text-tertiary: rgba(242,245,250,0.42);

  /* Accents */
  --blue: #3b82f6;
  --cyan: #22d3ee;
  --purple: #a855f7;
  --accent-gradient: linear-gradient(135deg, var(--blue), var(--cyan));
  --accent-gradient-2: linear-gradient(135deg, var(--purple), var(--blue));
  --glow-blue: rgba(59,130,246,0.35);
  --glow-cyan: rgba(34,211,238,0.28);
  --glow-purple: rgba(168,85,247,0.28);

  /* Radii */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 20px;
  --r-pill: 999px;

  /* Spacing */
  --sp-1: 4px; --sp-2: 8px; --sp-3: 12px; --sp-4: 16px;
  --sp-6: 24px; --sp-8: 32px; --sp-12: 48px; --sp-16: 64px; --sp-20: 96px;

  /* Type */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Menlo, Consolas, "Courier New", monospace;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.3s;
  --header-h: 76px;
}

/* ---------- Reset ---------- */
*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol{ padding: 0; list-style: none; }
img{ max-width: 100%; display: block; }
button, input, textarea{ font: inherit; color: inherit; }
a{ color: inherit; text-decoration: none; }
body{
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

.container{
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

.section{ padding: var(--sp-20) 0; position: relative; }

.skip-link{
  position: absolute; left: -999px; top: 0;
  background: var(--blue); color: #fff; padding: 8px 16px; z-index: 200;
}
.skip-link:focus{ left: 8px; top: 8px; border-radius: var(--r-sm); }

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Loader ---------- */
.loader{
  position: fixed; inset: 0; z-index: 999;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg);
  transition: opacity 0.5s var(--ease), visibility 0.5s var(--ease);
}
.loader__mark{
  font-family: var(--font-mono);
  font-size: 28px; font-weight: 700; letter-spacing: 2px;
  color: var(--text-primary);
  padding: 18px 26px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(59,130,246,0.12), rgba(34,211,238,0.08));
  box-shadow: 0 0 40px var(--glow-blue);
  animation: pulseLoader 1.1s var(--ease) infinite;
}
@keyframes pulseLoader{
  0%, 100%{ transform: scale(1); opacity: 1; }
  50%{ transform: scale(1.08); opacity: 0.7; }
}
.loader.is-hidden{ opacity: 0; visibility: hidden; pointer-events: none; }

/* ---------- Reusable ---------- */
.text-gradient{
  background: var(--accent-gradient);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

.eyebrow{
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--cyan);
  margin: 0 0 var(--sp-3);
}
.eyebrow__dot{
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--cyan);
}

.section__head{ max-width: 640px; margin-bottom: var(--sp-12); }
.section__title{
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.2; font-weight: 700; letter-spacing: -0.01em;
  margin-bottom: var(--sp-3);
}
.section__subtitle{ color: var(--text-secondary); font-size: 17px; }

.btn{
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 26px; border-radius: var(--r-md);
  font-weight: 600; font-size: 15px; border: 1px solid transparent;
  cursor: pointer; transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  min-height: 44px; white-space: nowrap;
}
.btn--primary{
  background: var(--accent-gradient); color: #071019;
  box-shadow: 0 8px 24px var(--glow-blue);
}
.btn--primary:hover{ transform: translateY(-2px); box-shadow: 0 12px 32px var(--glow-blue); }
.btn--ghost{
  background: rgba(255,255,255,0.03); color: var(--text-primary);
  border-color: var(--border-strong);
}
.btn--ghost:hover{ background: rgba(255,255,255,0.07); transform: translateY(-2px); border-color: var(--cyan); }
.btn--sm{ padding: 10px 18px; font-size: 14px; }
.btn--block{ width: 100%; }

/* ---------- Reveal on scroll ---------- */
.reveal{
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible{ opacity: 1; transform: translateY(0); }

/* ---------- Header ---------- */
.header{
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), height var(--dur) var(--ease);
}
.header.is-scrolled{
  background: rgba(10,14,23,0.75);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom-color: var(--border);
  height: 64px;
}
.nav{ display: flex; align-items: center; justify-content: space-between; width: 100%; gap: 16px; }
.nav__brand{ display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.nav__brand-mark{
  font-family: var(--font-mono); color: var(--cyan);
  border: 1px solid var(--border-strong); border-radius: var(--r-sm);
  padding: 4px 8px; font-size: 13px;
}
.nav__links{ display: flex; align-items: center; gap: 28px; margin-left: auto; margin-right: 24px; }
.nav__link{
  font-size: 14.5px; color: var(--text-secondary); position: relative; padding: 6px 2px;
  transition: color var(--dur) var(--ease);
}
.nav__link::after{
  content:""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--accent-gradient); transition: width var(--dur) var(--ease);
}
.nav__link:hover, .nav__link.is-active{ color: var(--text-primary); }
.nav__link:hover::after, .nav__link.is-active::after{ width: 100%; }
.nav__cta{ flex-shrink: 0; }

.nav__toggle{
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 44px; height: 44px; background: transparent; border: 1px solid var(--border-strong);
  border-radius: var(--r-sm); cursor: pointer;
}
.nav__toggle span{ width: 18px; height: 2px; background: var(--text-primary); margin: 0 auto; transition: transform var(--dur) var(--ease), opacity var(--dur) var(--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 ---------- */
.hero{
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
}
.hero__canvas{ position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }
.hero__glow{
  position: absolute; border-radius: 50%; filter: blur(90px); pointer-events: none;
}
.hero__glow--one{ width: 480px; height: 480px; background: var(--glow-blue); top: -120px; left: -120px; }
.hero__glow--two{ width: 420px; height: 420px; background: var(--glow-purple); bottom: -140px; right: -80px; }

.hero__inner{
  position: relative; z-index: 2;
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: var(--sp-16);
  align-items: center; padding-top: var(--sp-12); padding-bottom: var(--sp-12);
}
.hero__title{ font-size: clamp(36px, 5.4vw, 62px); line-height: 1.08; font-weight: 800; letter-spacing: -0.02em; margin-bottom: var(--sp-3); }
.hero__role{
  font-size: clamp(18px, 2vw, 22px); font-weight: 600; color: var(--cyan);
  margin-bottom: var(--sp-4);
}
.hero__intro{ max-width: 540px; color: var(--text-secondary); font-size: 17.5px; margin-bottom: var(--sp-8); }
.hero__actions{ display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: var(--sp-12); }
.hero__stats{ display: flex; gap: var(--sp-8); flex-wrap: wrap; }
.hero__stat{ display: flex; flex-direction: column; }
.hero__stat-num{ font-size: 26px; font-weight: 800; background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero__stat-label{ font-size: 13px; color: var(--text-tertiary); }

.hero__visual{ display: flex; justify-content: center; align-items: center; }
.orb{ position: relative; width: 340px; height: 340px; }
.orb__ring{
  position: absolute; inset: 0; border-radius: 50%; border: 1px solid var(--border-strong);
}
.orb__ring--a{ animation: spin 18s linear infinite; }
.orb__ring--b{ inset: 30px; border-color: rgba(34,211,238,0.25); animation: spin 24s linear infinite reverse; }
.orb__ring--c{ inset: 60px; border-color: rgba(168,85,247,0.25); animation: spin 30s linear infinite; }
@keyframes spin{ to{ transform: rotate(360deg); } }
.orb__core{
  position: absolute; inset: 110px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono); font-weight: 700; font-size: 22px;
  background: radial-gradient(circle at 35% 30%, rgba(59,130,246,0.35), rgba(10,14,23,0.9));
  border: 1px solid var(--border-strong);
  box-shadow: 0 0 60px var(--glow-blue), inset 0 0 30px rgba(34,211,238,0.15);
  animation: floatCore 5s ease-in-out infinite;
}
@keyframes floatCore{ 0%,100%{ transform: translateY(0); } 50%{ transform: translateY(-8px); } }
.orb__node{
  position: absolute; font-size: 12px; font-weight: 600; font-family: var(--font-mono);
  padding: 6px 10px; border-radius: var(--r-pill);
  background: rgba(19,24,41,0.85); border: 1px solid var(--border-strong);
  backdrop-filter: blur(6px); color: var(--text-secondary);
  animation: floatNode 6s ease-in-out infinite;
}
.orb__node--1{ top: 6%; left: 4%; animation-delay: 0s; }
.orb__node--2{ top: 12%; right: 0%; animation-delay: 1.2s; }
.orb__node--3{ bottom: 8%; left: 0%; animation-delay: 2.1s; }
.orb__node--4{ bottom: 2%; right: 8%; animation-delay: 3s; }
@keyframes floatNode{ 0%,100%{ transform: translateY(0); } 50%{ transform: translateY(-10px); } }

.scroll-cue{
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px; border: 1px solid var(--border-strong); border-radius: var(--r-pill);
  display: flex; justify-content: center; padding-top: 8px; z-index: 2;
}
.scroll-cue__dot{ width: 4px; height: 8px; border-radius: 2px; background: var(--cyan); animation: scrollCue 1.8s ease-in-out infinite; }
@keyframes scrollCue{ 0%{ opacity: 1; transform: translateY(0); } 70%{ opacity: 0; transform: translateY(14px); } 100%{ opacity: 0; } }

/* ---------- About ---------- */
.about__grid{ display: grid; grid-template-columns: 0.85fr 1.15fr; gap: var(--sp-16); align-items: center; }
.about__media{ position: relative; }
.about__frame{
  border-radius: var(--r-lg); overflow: hidden; border: 1px solid var(--border-strong);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.about__badge{
  position: absolute; bottom: -18px; left: -18px;
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--r-md);
  padding: 12px 16px; display: flex; flex-direction: column; box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
.about__badge strong{ font-size: 18px; color: var(--cyan); }
.about__badge span{ font-size: 12px; color: var(--text-tertiary); }

.about__copy p{ color: var(--text-secondary); margin-bottom: var(--sp-4); }
.about__points{ display: grid; gap: 10px; margin: var(--sp-6) 0 var(--sp-8); }
.about__points li{ display: flex; align-items: flex-start; gap: 10px; color: var(--text-secondary); font-size: 15px; }
.about__point-icon{ color: var(--cyan); font-size: 8px; margin-top: 7px; }

/* ---------- Skills ---------- */
.skills__grid{ display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-6); }
.skill-card{
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--sp-8); transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.skill-card:hover{ transform: translateY(-4px); border-color: rgba(59,130,246,0.4); box-shadow: 0 16px 40px rgba(59,130,246,0.12); }
.skill-card__head{ display: flex; align-items: center; gap: 12px; margin-bottom: var(--sp-6); }
.skill-card__icon{ font-size: 22px; }
.skill-card__head h3{ font-size: 18px; font-weight: 700; }
.skill-card__tags{ display: flex; flex-wrap: wrap; gap: 8px; }
.tag{
  font-size: 13px; padding: 7px 13px; border-radius: var(--r-pill);
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  color: var(--text-secondary); transition: border-color var(--dur), color var(--dur), transform var(--dur);
}
.tag:hover{ border-color: var(--cyan); color: var(--text-primary); transform: translateY(-2px); }

/* ---------- Projects ---------- */
.filters{ display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: var(--sp-8); }
.filter-btn{
  background: transparent; border: 1px solid var(--border-strong); color: var(--text-secondary);
  padding: 10px 18px; border-radius: var(--r-pill); font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all var(--dur) var(--ease); min-height: 44px;
}
.filter-btn:hover{ border-color: var(--cyan); color: var(--text-primary); }
.filter-btn.is-active{ background: var(--accent-gradient); color: #071019; border-color: transparent; }

.projects__grid{
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6);
}
.project-card{
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  overflow: hidden; display: flex; flex-direction: column;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  animation: cardIn 0.4s var(--ease);
}
@keyframes cardIn{ from{ opacity: 0; transform: translateY(14px); } to{ opacity: 1; transform: translateY(0); } }
.project-card:hover{ transform: translateY(-6px); border-color: rgba(34,211,238,0.4); box-shadow: 0 20px 50px rgba(0,0,0,0.35); }
.project-card__media{ position: relative; aspect-ratio: 16/10; overflow: hidden; border-bottom: 1px solid var(--border); }
.project-card__media img{ width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s var(--ease); }
.project-card:hover .project-card__media img{ transform: scale(1.06); }
.project-card__category{
  position: absolute; top: 12px; left: 12px; font-size: 11.5px; font-weight: 700;
  padding: 5px 10px; border-radius: var(--r-pill); text-transform: uppercase; letter-spacing: 0.04em;
  background: rgba(10,14,23,0.75); border: 1px solid var(--border-strong); backdrop-filter: blur(6px);
  color: var(--cyan);
}
.project-card__body{ padding: var(--sp-6); display: flex; flex-direction: column; gap: 10px; flex: 1; }
.project-card__body h3{ font-size: 19px; font-weight: 700; }
.project-card__desc{ color: var(--text-secondary); font-size: 14.5px; }
.project-card__problem{ font-size: 13.5px; color: var(--text-tertiary); }
.project-card__problem strong{ color: var(--text-secondary); }
.project-card__tags{ display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.project-card__tags .tag{ padding: 4px 10px; font-size: 12px; }
.project-card__actions{ display: flex; gap: 10px; margin-top: auto; padding-top: var(--sp-3); }
.project-card__actions .btn{ padding: 10px 16px; font-size: 13.5px; }

/* ---------- Modal ---------- */
.modal{ position: fixed; inset: 0; z-index: 200; display: flex; align-items: center; justify-content: center; padding: 24px; }
.modal[hidden]{ display: none; }
.modal__backdrop{ position: absolute; inset: 0; background: rgba(6,8,14,0.72); backdrop-filter: blur(4px); }
.modal__panel{
  position: relative; z-index: 1; max-width: 720px; width: 100%; max-height: 85vh; overflow-y: auto;
  background: var(--surface-2); border: 1px solid var(--border-strong); border-radius: var(--r-lg);
  padding: var(--sp-8); animation: modalIn 0.3s var(--ease);
}
@keyframes modalIn{ from{ opacity: 0; transform: translateY(16px) scale(0.98); } to{ opacity: 1; transform: translateY(0) scale(1); } }
.modal__close{
  position: absolute; top: 16px; right: 16px; width: 40px; height: 40px; border-radius: 50%;
  background: rgba(255,255,255,0.05); border: 1px solid var(--border-strong); color: var(--text-primary);
  font-size: 22px; line-height: 1; cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.modal__close:hover{ background: rgba(255,255,255,0.1); }
.modal-detail__eyebrow{ color: var(--cyan); font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; }
.modal-detail__title{ font-size: 26px; font-weight: 800; margin-bottom: var(--sp-4); }
.modal-detail__section{ margin-bottom: var(--sp-6); }
.modal-detail__section h4{ font-size: 14px; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-tertiary); margin-bottom: 8px; }
.modal-detail__section p{ color: var(--text-secondary); font-size: 15px; }
.modal-detail__section ul{ display: grid; gap: 6px; }
.modal-detail__section li{ color: var(--text-secondary); font-size: 15px; display: flex; gap: 8px; }
.modal-detail__section li::before{ content: "—"; color: var(--cyan); }
.modal-detail__tags{ display: flex; flex-wrap: wrap; gap: 8px; }
.modal-detail__actions{ display: flex; gap: 12px; flex-wrap: wrap; margin-top: var(--sp-6); }

/* ---------- Experience ---------- */
.experience__grid{ display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--sp-6); }
.experience-card{
  background: linear-gradient(160deg, rgba(255,255,255,0.03), rgba(255,255,255,0));
  border: 1px solid var(--border); border-radius: var(--r-lg); padding: var(--sp-6);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.experience-card:hover{ transform: translateY(-4px); border-color: rgba(168,85,247,0.4); }
.experience-card__icon{ font-size: 26px; display: block; margin-bottom: var(--sp-3); }
.experience-card h3{ font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.experience-card p{ font-size: 14px; color: var(--text-secondary); }

/* ---------- Process ---------- */
.process__list{ display: grid; gap: var(--sp-4); }
.process__step{
  display: grid; grid-template-columns: 90px 1fr; gap: var(--sp-8); align-items: start;
  padding: var(--sp-6) 0; border-bottom: 1px solid var(--border);
}
.process__step:last-child{ border-bottom: none; }
.process__num{
  font-family: var(--font-mono); font-size: 34px; font-weight: 800;
  background: var(--accent-gradient); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.process__content h3{ font-size: 20px; font-weight: 700; margin-bottom: 6px; }
.process__content p{ color: var(--text-secondary); }

/* ---------- GitHub ---------- */
.github__panel{
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-16);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--sp-12);
}
.github__info .section__subtitle{ margin-bottom: var(--sp-6); }
.github__stats{ display: flex; gap: var(--sp-8); margin-top: var(--sp-8); flex-wrap: wrap; }
.github__stat{ display: flex; flex-direction: column; }
.github__stat strong{ font-size: 24px; font-weight: 800; color: var(--cyan); }
.github__stat span{ font-size: 12.5px; color: var(--text-tertiary); }
.github__repos{ display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--sp-4); align-content: start; }
.repo-card{
  background: rgba(255,255,255,0.03); border: 1px solid var(--border); border-radius: var(--r-md);
  padding: var(--sp-4); transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.repo-card:hover{ transform: translateY(-3px); border-color: var(--cyan); }
.repo-card__head{ display: flex; align-items: center; gap: 8px; margin-bottom: 6px; font-size: 14.5px; }
.repo-card p{ font-size: 13px; color: var(--text-secondary); margin-bottom: 10px; }
.repo-card__meta{ display: flex; gap: 12px; font-size: 12px; color: var(--text-tertiary); }

/* ---------- Contact ---------- */
.contact__grid{ display: grid; grid-template-columns: 0.8fr 1.2fr; gap: var(--sp-16); }
.contact__info{ display: grid; gap: var(--sp-4); align-content: start; }
.contact__link{
  display: flex; align-items: center; gap: 14px; padding: var(--sp-4);
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.contact__link:hover{ transform: translateX(4px); border-color: var(--cyan); }
.contact__link-icon{ font-size: 20px; width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; border-radius: 50%; background: rgba(255,255,255,0.05); flex-shrink: 0; }
.contact__link strong{ display: block; font-size: 14px; }
.contact__link span{ font-size: 13.5px; color: var(--text-secondary); }

.contact__form{
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-lg);
  padding: var(--sp-8); display: flex; flex-direction: column; gap: var(--sp-4);
}
.form-row{ display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-4); }
.form-field{ display: flex; flex-direction: column; gap: 6px; }
.form-field label{ font-size: 13.5px; font-weight: 600; color: var(--text-secondary); }
.form-field input, .form-field textarea{
  background: rgba(255,255,255,0.03); border: 1px solid var(--border-strong); border-radius: var(--r-sm);
  padding: 12px 14px; color: var(--text-primary); font-size: 15px; resize: vertical;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.form-field input:focus, .form-field textarea:focus{
  border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(34,211,238,0.18); outline: none;
}
.form-field.has-error input, .form-field.has-error textarea{ border-color: #e56458; }
.form-error{ font-size: 12.5px; color: #ff8a80; min-height: 16px; }
.form-status{ font-size: 14px; min-height: 20px; }
.form-status.is-success{ color: #46d19a; }
.form-status.is-error{ color: #ff8a80; }
.form-note{ font-size: 12.5px; color: var(--text-tertiary); }

/* ---------- Footer ---------- */
.footer{ border-top: 1px solid var(--border); padding: var(--sp-12) 0 var(--sp-6); }
.footer__inner{ display: flex; justify-content: space-between; align-items: center; gap: var(--sp-8); flex-wrap: wrap; margin-bottom: var(--sp-8); }
.footer__brand p{ color: var(--text-tertiary); font-size: 13.5px; margin-top: 6px; }
.footer__nav{ display: flex; gap: 20px; flex-wrap: wrap; }
.footer__nav a{ font-size: 14px; color: var(--text-secondary); transition: color var(--dur); }
.footer__nav a:hover{ color: var(--cyan); }
.footer__social{ display: flex; gap: 10px; }
.footer__social a{
  width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center; transition: border-color var(--dur), transform var(--dur);
}
.footer__social a:hover{ border-color: var(--cyan); transform: translateY(-2px); }
.footer__bottom{ border-top: 1px solid var(--border); padding-top: var(--sp-4); }
.footer__bottom p{ font-size: 13px; color: var(--text-tertiary); }

/* ---------- Back to top ---------- */
.back-to-top{
  position: fixed; bottom: 24px; right: 24px; z-index: 90;
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--surface-2); border: 1px solid var(--border-strong); color: var(--text-primary);
  font-size: 18px; cursor: pointer; opacity: 0; pointer-events: none; transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), border-color var(--dur);
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
}
.back-to-top.is-visible{ opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover{ border-color: var(--cyan); }

/* ===========================================================
   Responsive
=========================================================== */
@media (max-width: 980px){
  .hero__inner{ grid-template-columns: 1fr; text-align: left; }
  .hero__visual{ order: -1; margin-bottom: var(--sp-6); }
  .orb{ width: 260px; height: 260px; }
  .about__grid, .contact__grid{ grid-template-columns: 1fr; }
  .about__media{ max-width: 380px; margin: 0 auto var(--sp-8); }
  .skills__grid{ grid-template-columns: 1fr; }
  .projects__grid{ grid-template-columns: repeat(2, 1fr); }
  .experience__grid{ grid-template-columns: repeat(2, 1fr); }
  .github__panel{ grid-template-columns: 1fr; padding: var(--sp-8); }
  .github__repos{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px){
  .nav__links{
    position: fixed; top: var(--header-h); left: 0; right: 0;
    background: rgba(10,14,23,0.97); backdrop-filter: blur(16px);
    flex-direction: column; align-items: flex-start; gap: 4px;
    padding: var(--sp-4) 24px var(--sp-8);
    border-bottom: 1px solid var(--border);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
    margin: 0;
  }
  .nav__links.is-open{ transform: translateY(0); opacity: 1; visibility: visible; }
  .nav__links li{ width: 100%; }
  .nav__link{ display: block; padding: 12px 4px; width: 100%; font-size: 16px; }
  .nav__cta{ display: none; }
  .nav__toggle{ display: flex; }
}

@media (max-width: 720px){
  .process__step{ grid-template-columns: 56px 1fr; gap: var(--sp-4); }
  .process__num{ font-size: 26px; }
  .projects__grid{ grid-template-columns: 1fr; }
  .experience__grid{ grid-template-columns: 1fr; }
  .github__repos{ grid-template-columns: 1fr; }
  .form-row{ grid-template-columns: 1fr; }
  .hero__stats{ gap: var(--sp-6); }
  .section{ padding: var(--sp-16) 0; }
}

@media (max-width: 480px){
  .container{ padding: 0 18px; }
  .hero__title{ font-size: 34px; }
  .btn{ width: 100%; }
  .hero__actions{ flex-direction: column; }
  .hero__actions .btn{ width: 100%; }
  .modal__panel{ padding: var(--sp-6); }
}