/* =========================================================
   Alex Rivera — Developer portfolio
   Lean, dependency-free CSS. Edit the :root tokens to rebrand.
========================================================= */
*,*::before,*::after{box-sizing:border-box}
:root{
  --bg:#080810; --bg2:#0d0d1a; --panel:#12121f;
  --ink:#eef0fb; --muted:#9aa0c0; --line:rgba(255,255,255,.09);
  --brand:#7c6cff; --brand2:#22d3ee; --accent:#f472b6;
  --grad:linear-gradient(120deg,#8b7bff,#22d3ee);
  --grad2:linear-gradient(120deg,#f472b6,#fb923c);
  --r:18px; --maxw:1140px; --ease:cubic-bezier(.2,.7,.2,1);
  --shadow:0 18px 50px -20px rgba(0,0,0,.7);
}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0; font-family:Inter,system-ui,sans-serif; color:var(--ink);
  background:var(--bg); line-height:1.6; overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.brand__name{font-family:Sora,sans-serif;line-height:1.12;letter-spacing:-.02em}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 22px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.grad--2{background:var(--grad2);-webkit-background-clip:text;background-clip:text;color:transparent}
.muted{color:var(--muted)}
.skip-link{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:10px 16px;z-index:200;border-radius:0 0 10px 0}
.skip-link:focus{left:0}
:focus-visible{outline:2px solid var(--brand2);outline-offset:3px;border-radius:6px}

/* ---------- animated backdrop ---------- */
.bg-aurora,.bg-particles,.bg-grid{position:fixed;inset:0;z-index:-3;pointer-events:none}
.bg-aurora{
  z-index:-3;
  background:
    radial-gradient(40vw 40vw at 12% 10%,rgba(124,108,255,.30),transparent 60%),
    radial-gradient(45vw 45vw at 88% 18%,rgba(34,211,238,.22),transparent 60%),
    radial-gradient(50vw 50vw at 60% 95%,rgba(244,114,182,.18),transparent 60%),
    var(--bg);
  animation:aurora 18s var(--ease) infinite alternate;
}
@keyframes aurora{0%{filter:hue-rotate(0deg)}100%{filter:hue-rotate(28deg)}}
.bg-particles{z-index:-2;opacity:.55}
.bg-grid{
  z-index:-2;opacity:.35;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:54px 54px;
  -webkit-mask-image:radial-gradient(70% 60% at 50% 0%,#000,transparent 75%);
  mask-image:radial-gradient(70% 60% at 50% 0%,#000,transparent 75%);
}

/* ---------- buttons ---------- */
.btn{
  --pad:14px 22px; display:inline-flex;align-items:center;gap:.5em;
  padding:var(--pad);border-radius:999px;font-weight:600;font-family:Sora,sans-serif;
  cursor:pointer;border:1px solid transparent;transition:transform .25s var(--ease),box-shadow .25s,background .25s,border-color .25s;
  font-size:.97rem;will-change:transform;
}
.btn--primary{background:var(--grad);color:#0b0b16;box-shadow:0 10px 30px -8px rgba(124,108,255,.6)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px -10px rgba(124,108,255,.75)}
.btn--ghost{background:rgba(255,255,255,.04);border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{transform:translateY(-2px);border-color:var(--brand2);background:rgba(255,255,255,.07)}
.btn__arrow{transition:transform .25s var(--ease)}
.btn:hover .btn__arrow{transform:translateX(4px)}

/* ---------- nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .3s,backdrop-filter .3s,border-color .3s;border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(10,10,20,.72);backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:inline-flex;align-items:center;gap:.55em;font-weight:800;font-size:1.1rem}
.brand__dot{width:12px;height:12px;border-radius:50%;background:var(--grad);box-shadow:0 0 14px var(--brand)}
.nav__links{display:flex;align-items:center;gap:26px}
.nav__links a{color:var(--muted);font-size:.95rem;font-weight:500;transition:color .2s;position:relative}
.nav__links a:not(.btn):hover{color:var(--ink)}
.nav__links a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-6px;height:2px;width:0;background:var(--grad);transition:width .25s var(--ease)}
.nav__links a:not(.btn):hover::after{width:100%}
.nav__cta{padding:9px 18px}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav__toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.3s 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)}
.nav__mobile{display:none;flex-direction:column;gap:6px;padding:0 22px;background:rgba(12,12,22,.97);backdrop-filter:blur(14px);overflow:hidden;max-height:0;transition:max-height .35s var(--ease),padding .35s}
.nav__mobile.open{max-height:380px;padding:14px 22px 22px}
.nav__mobile a{padding:12px 4px;color:var(--ink);border-bottom:1px solid var(--line);font-weight:500}
.nav__mobile a.btn{border:0;justify-content:center;margin-top:10px}

/* ---------- hero ---------- */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;padding:110px 0 60px}
.hero__inner{max-width:880px}
.hero__eyebrow{display:inline-flex;align-items:center;gap:.6em;font-size:.85rem;color:var(--muted);
  border:1px solid var(--line);padding:7px 14px;border-radius:999px;background:rgba(255,255,255,.03)}
.status-dot{width:8px;height:8px;border-radius:50%;background:#34d399;box-shadow:0 0 0 0 rgba(52,211,153,.7);animation:pulse 2.2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 8px rgba(52,211,153,0)}100%{box-shadow:0 0 0 0 rgba(52,211,153,0)}}
.hero__title{font-size:clamp(2.5rem,7vw,4.6rem);font-weight:800;margin:.4em 0 .2em}
.hero__role{font-family:Sora,sans-serif;color:var(--brand2);font-size:clamp(1rem,3.2vw,1.5rem);margin:.2em 0;min-height:1.5em;font-weight:600}
.caret{animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.hero__sub{color:var(--muted);font-size:clamp(1rem,2.4vw,1.18rem);max-width:60ch;margin:1.1em 0 0}
.hero__cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:2em}
.hero__stats{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:3.2em 0 0;padding:0}
.hero__stats li{display:flex;flex-direction:column}
.hero__stats .stat{font-family:Sora,sans-serif;font-weight:800;font-size:clamp(1.5rem,4vw,2.2rem);background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero__stats small{color:var(--muted);font-size:.8rem}
.hero__scroll{position:absolute;left:50%;bottom:24px;transform:translateX(-50%);color:var(--muted);font-size:.75rem;letter-spacing:.18em;text-transform:uppercase;display:flex;flex-direction:column;align-items:center;gap:8px}
.hero__scroll span{width:1px;height:34px;background:linear-gradient(var(--brand2),transparent);animation:scrolldn 1.8s var(--ease) infinite}
@keyframes scrolldn{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform:scaleY(1);transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}

/* ---------- marquee ---------- */
.marquee{overflow:hidden;border-block:1px solid var(--line);padding:18px 0;background:rgba(255,255,255,.02);-webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent)}
.marquee__track{display:flex;gap:46px;width:max-content;animation:marq 28s linear infinite}
.marquee__track span{color:var(--muted);font-family:Sora,sans-serif;font-weight:600;font-size:1.05rem;white-space:nowrap}
@keyframes marq{to{transform:translateX(-50%)}}
.marquee:hover .marquee__track{animation-play-state:paused}

/* ---------- sections ---------- */
.section{padding:clamp(64px,9vw,120px) 0;position:relative}
.section--alt{background:linear-gradient(180deg,transparent,rgba(255,255,255,.02),transparent)}
.section__head{max-width:680px;margin:0 auto 52px;text-align:center}
.kicker{text-transform:uppercase;letter-spacing:.2em;font-size:.78rem;font-weight:600;color:var(--brand2);margin:0 0 .6em}
.section h2{font-size:clamp(1.8rem,4.5vw,2.8rem);margin:0}
.section__lead{color:var(--muted);margin:.8em 0 0}

.grid{display:grid;gap:22px}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--projects{grid-template-columns:repeat(2,1fr)}

/* ---------- cards ---------- */
.card{background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.02));border:1px solid var(--line);border-radius:var(--r);padding:30px;transition:transform .35s var(--ease),border-color .35s,box-shadow .35s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;inset:0;background:radial-gradient(420px circle at var(--mx,50%) var(--my,0%),rgba(124,108,255,.18),transparent 45%);opacity:0;transition:opacity .35s}
.card:hover{border-color:rgba(124,108,255,.5);box-shadow:var(--shadow)}
.card:hover::before{opacity:1}
.card__icon{font-size:2rem;width:60px;height:60px;display:grid;place-items:center;border-radius:14px;background:rgba(124,108,255,.12);border:1px solid var(--line);margin-bottom:18px}
.card h3{margin:0 0 .5em;font-size:1.25rem}
.card p{color:var(--muted);margin:0 0 1em}
.ticks{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}
.ticks li{position:relative;padding-left:24px;font-size:.92rem}
.ticks li::before{content:"✓";position:absolute;left:0;color:var(--brand2);font-weight:700}

/* ---------- projects ---------- */
.project{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:transform .35s var(--ease),box-shadow .35s,border-color .35s}
.project:hover{box-shadow:var(--shadow);border-color:rgba(34,211,238,.4)}
.project__media{position:relative;height:200px;display:grid;place-items:center;background:linear-gradient(135deg,var(--p1),var(--p2));overflow:hidden}
.project__media::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 20%,rgba(255,255,255,.25),transparent 50%)}
.project__badge{position:absolute;top:14px;left:14px;z-index:2;font-size:.72rem;font-weight:600;background:rgba(0,0,0,.45);color:#fff;padding:5px 12px;border-radius:999px;backdrop-filter:blur(4px)}
.project__phone{width:88px;height:150px;border-radius:18px;background:#0c0c16;border:3px solid rgba(255,255,255,.5);padding:8px;box-shadow:0 20px 40px -12px rgba(0,0,0,.6);transition:transform .5s var(--ease)}
.project__screen{width:100%;height:100%;border-radius:9px;background:linear-gradient(180deg,rgba(255,255,255,.25),rgba(255,255,255,.06))}
.project:hover .project__phone{transform:translateY(-6px) rotate(-3deg)}
.project__browser{width:78%;height:120px;border-radius:12px;background:#0c0c16;border:1px solid rgba(255,255,255,.4);box-shadow:0 20px 40px -12px rgba(0,0,0,.6);transition:transform .5s var(--ease);padding:0}
.project__browser i{display:inline-block;width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.6);margin:10px 3px 0 10px}
.project:hover .project__browser{transform:translateY(-6px) scale(1.02)}
.project__body{padding:24px}
.project__body h3{margin:0 0 .4em;font-size:1.2rem}
.project__body p{color:var(--muted);margin:0 0 .6em;font-size:.95rem}
.project__metric{color:var(--brand2)!important;font-weight:600;font-size:.88rem!important}
.project__tags{display:flex;flex-wrap:wrap;gap:8px;margin:.4em 0 1em}
.project__tags span{font-size:.75rem;color:var(--muted);border:1px solid var(--line);padding:4px 10px;border-radius:999px}
.link-arrow{color:var(--ink);font-weight:600;font-size:.92rem;transition:gap .25s;display:inline-flex;gap:4px}
.link-arrow:hover{color:var(--brand2)}

/* ---------- stack ---------- */
.stack{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.stack__col{background:rgba(255,255,255,.02);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.stack__col h3{margin:0 0 1em;font-size:1.05rem;color:var(--brand2)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{font-size:.85rem;padding:7px 13px;border-radius:10px;background:rgba(124,108,255,.1);border:1px solid var(--line);transition:transform .2s,background .2s}
.chips span:hover{transform:translateY(-3px);background:rgba(124,108,255,.22)}

/* ---------- process ---------- */
.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:s}
.step{background:linear-gradient(180deg,rgba(255,255,255,.04),transparent);border:1px solid var(--line);border-radius:var(--r);padding:28px 24px;position:relative}
.step__num{font-family:Sora,sans-serif;font-weight:800;font-size:2.4rem;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;margin-bottom:.2em}
.step h3{margin:0 0 .4em;font-size:1.15rem}
.step p{color:var(--muted);margin:0;font-size:.92rem}

/* ---------- about ---------- */
.about{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px;align-items:center}
.about__media{position:relative;display:grid;place-items:center}
.about__photo{width:min(300px,80%);aspect-ratio:1;border-radius:24px;display:grid;place-items:center;font-family:Sora,sans-serif;font-weight:800;font-size:4rem;color:#0b0b16;background:var(--grad);box-shadow:var(--shadow);position:relative;z-index:1}
.about__glow{position:absolute;inset:10% ;border-radius:50%;background:var(--grad);filter:blur(60px);opacity:.4;z-index:0}
.about__body h2{margin:.2em 0 .5em}
.about__body p{color:var(--muted)}
.about__points{list-style:none;padding:0;margin:1.4em 0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.about__points li{font-size:.95rem}

/* ---------- testimonials ---------- */
.quote{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:28px;margin:0;transition:transform .35s var(--ease),border-color .35s}
.quote:hover{transform:translateY(-5px);border-color:rgba(244,114,182,.4)}
.quote__stars{color:#fbbf24;letter-spacing:2px;margin-bottom:12px}
.quote blockquote{margin:0 0 16px;font-size:1rem;line-height:1.6}
.quote figcaption{display:flex;flex-direction:column}
.quote figcaption strong{font-family:Sora,sans-serif}
.quote figcaption span{color:var(--muted);font-size:.85rem}

/* ---------- contact ---------- */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact__intro h2{margin:.2em 0 .4em}
.contact__intro p{color:var(--muted)}
.contact__list{list-style:none;padding:0;margin:1.6em 0 0;display:flex;flex-direction:column;gap:14px}
.contact__list li{display:flex;align-items:center;gap:12px}
.contact__list a:hover{color:var(--brand2)}
.contact__form{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:30px;display:flex;flex-direction:column;gap:16px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:.88rem;font-weight:500}
.field input,.field select,.field textarea{
  background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:12px;
  padding:13px 15px;color:var(--ink);font:inherit;font-size:.95rem;width:100%;transition:border-color .2s,background .2s}
.field textarea{resize:vertical;min-height:110px}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--brand);background:rgba(124,108,255,.06)}
.field.invalid input,.field.invalid textarea{border-color:#f87171}
.field select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%239aa0c0' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 15px center}
.error{color:#f87171;font-size:.8rem;min-height:1em}
.form-note{font-size:.9rem;margin:0}
.form-note.ok{color:#34d399}

/* ---------- footer ---------- */
.footer{border-top:1px solid var(--line);padding:54px 0 30px;margin-top:40px;background:rgba(0,0,0,.25)}
.footer__inner{display:flex;flex-wrap:wrap;justify-content:space-between;gap:28px;align-items:center}
.footer__tag{color:var(--muted);margin:.6em 0 0;font-size:.92rem}
.footer__links{display:flex;flex-wrap:wrap;gap:20px}
.footer__links a{color:var(--muted);font-size:.92rem}
.footer__links a:hover{color:var(--ink)}
.footer__social{display:flex;gap:10px}
.footer__social a{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--line);border-radius:12px;font-size:.78rem;font-weight:600;color:var(--muted);transition:.25s var(--ease)}
.footer__social a:hover{color:#fff;border-color:var(--brand);transform:translateY(-3px);background:rgba(124,108,255,.15)}
.footer__copy{text-align:center;color:var(--muted);font-size:.82rem;margin:30px 0 0}

/* ---------- back to top ---------- */
.to-top{position:fixed;right:20px;bottom:20px;z-index:90;width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:rgba(12,12,22,.85);backdrop-filter:blur(8px);color:var(--ink);font-size:1.1rem;cursor:pointer;opacity:0;transform:translateY(16px) scale(.8);pointer-events:none;transition:.3s var(--ease)}
.to-top.show{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{border-color:var(--brand);transform:translateY(-3px)}

/* ---------- scroll reveal ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .grid--3{grid-template-columns:1fr 1fr}
  .stack,.steps{grid-template-columns:1fr 1fr}
  .about{grid-template-columns:1fr;gap:32px}
  .about__media{order:-1}
  .contact{grid-template-columns:1fr;gap:32px}
}
@media (max-width:720px){
  .nav__links{display:none}
  .nav__toggle{display:flex}
  .nav__mobile{display:flex}
  .grid--projects{grid-template-columns:1fr}
  .hero__stats{grid-template-columns:1fr 1fr;gap:22px}
}
@media (max-width:520px){
  .grid--3{grid-template-columns:1fr}
  .stack,.steps{grid-template-columns:1fr}
  .about__points{grid-template-columns:1fr}
  .footer__inner{flex-direction:column;align-items:flex-start}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .reveal{opacity:1;transform:none}
  .bg-particles{display:none}
}