/* Zarnethub · Fajar Sidik — dark minimal developer portfolio.
   Layout: 3-column hero (headline · code window · side info), then quiet sections divided by hairlines. */
:root{
  --bg:#1B1E25;          /* page */
  --bg-2:#20242C;        /* alternating band */
  --surface:#272C35;     /* cards */
  --line:#343A45;        /* hairlines */
  --fg:#F4F5F7;          /* text */
  --muted:#A3ABB8;       /* secondary text, 7:1 on --bg */
  --accent:#2F6FEB;      /* blue, white text 4.9:1 */
  --accent-hi:#5A8DF2;   /* accent text on dark */
  --ok:#3FCF8E;
  --f-sans:"Plus Jakarta Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Consolas,monospace;
  --radius:14px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:400 16px/1.65 var(--f-sans);-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--bg)}
img,svg{max-width:100%}
[hidden]{display:none!important}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent-hi);outline-offset:3px;border-radius:4px}
.wrap{max-width:1140px;margin:0 auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:#fff;padding:10px 14px;border-radius:8px;z-index:40}
.skip:focus{left:12px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

/* ---------- header ---------- */
.site-head{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(27,30,37,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:border-color .2s}
.site-head.scrolled{border-bottom-color:var(--line)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:68px}
.brand{display:inline-flex;align-items:center;gap:8px;min-height:44px;font-weight:800;font-size:18px;text-decoration:none;letter-spacing:-.01em}
.brand{gap:10px}
.logo{width:36px;height:36px;flex:none}
.foot-brand{display:inline-flex;align-items:center;gap:10px}
.foot-brand .logo{width:28px;height:28px}
.nav{display:none;align-items:center;gap:28px}
.nav a{text-decoration:none;color:var(--muted);font-size:14.5px;font-weight:500;transition:color .15s}
.nav a:hover,.nav a[aria-current="true"]{color:var(--fg)}
.btn.head-cta{display:none}
.menu-btn{display:inline-grid;place-items:center;width:44px;height:44px;border:0;background:transparent;color:var(--fg);cursor:pointer;border-radius:10px}
.menu-btn span,.menu-btn span::before,.menu-btn span::after{display:block;width:22px;height:2px;background:currentColor;border-radius:2px;position:relative;transition:transform .2s}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0}
.menu-btn span::before{top:-7px}.menu-btn span::after{top:7px}
.menu-btn[aria-expanded="true"] span{background:transparent}
.menu-btn[aria-expanded="true"] span::before{transform:translateY(7px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span::after{transform:translateY(-7px) rotate(-45deg)}
.mobile-nav{border-top:1px solid var(--line);background:var(--bg)}
.mobile-nav .wrap{display:grid;justify-content:stretch;align-items:stretch;padding-block:8px 20px}
.mobile-nav a{display:flex;align-items:center;min-height:48px;text-decoration:none;font-weight:600;font-size:17px;border-bottom:1px solid var(--line)}
.mobile-nav .btn{margin-top:16px;border-bottom:0}

/* ---------- buttons & links ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 22px;border-radius:999px;border:1px solid transparent;font:600 15px/1 var(--f-sans);text-decoration:none;cursor:pointer;transition:background-color .15s,transform .15s,border-color .15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#255fd6;transform:translateY(-1px)}
.btn-line{border-color:var(--line);color:var(--fg);background:transparent}
.btn-line:hover{border-color:var(--muted)}
.btn svg{width:18px;height:18px;flex:none}
.link-arrow{display:inline-flex;align-items:center;gap:8px;min-height:44px;font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;text-decoration:none;border-bottom:1px solid var(--line);transition:gap .15s,border-color .15s}
.link-arrow:hover{gap:12px;border-color:var(--fg)}
.link-arrow svg{width:14px;height:14px}

/* ---------- type ---------- */
.eyebrow{display:flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin:0 0 18px}
.eyebrow::before{content:"/";color:var(--accent-hi);font-weight:800}
h1,h2,h3{margin:0;letter-spacing:-.02em;text-wrap:balance}
h2{font-size:clamp(28px,4.2vw,40px);line-height:1.15;font-weight:700}
h3{font-size:19px;line-height:1.3;font-weight:700}
.muted{color:var(--muted)}
.lede{color:var(--muted);max-width:36em}

/* ---------- hero ---------- */
.hero .wrap{display:grid;gap:44px;padding-block:48px 72px}
.hero-main .rule{display:block;width:56px;height:4px;background:var(--fg);border-radius:2px;margin-bottom:28px}
.hero h1{font-size:clamp(38px,8.4vw,58px);line-height:1.08;font-weight:800}
.hero h1 .hl{color:var(--accent-hi)}
.hero-main p{color:var(--muted);margin:20px 0 32px;max-width:30em}
.hero-actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.round-btn{display:inline-grid;place-items:center;width:72px;height:72px;border-radius:50%;background:var(--accent);color:#fff;text-decoration:none;transition:transform .2s}
.round-btn:hover{transform:translateY(3px)}
.round-btn svg{width:24px;height:24px}
.status{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;color:var(--muted)}
.status i{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(63,207,142,.18)}

/* code window replaces the portrait */
.code{margin:0;min-width:0;background:#15181E;border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 30px 80px -30px rgba(0,0,0,.6);overflow:hidden;align-self:center}
.code-bar{display:flex;align-items:center;gap:8px;padding:12px 14px;border-bottom:1px solid var(--line)}
.code-bar i{width:10px;height:10px;border-radius:50%;background:var(--line)}
.code-bar i:first-child{background:#E5534B}.code-bar i:nth-child(2){background:#D9A400}.code-bar i:nth-child(3){background:#3FB950}
.code-bar span{margin-left:8px;font:500 12px/1 var(--f-mono);color:var(--muted)}
.code pre{margin:0;padding:18px 18px 22px;font:500 12.5px/1.75 var(--f-mono);color:#C9D1D9;overflow-x:auto;counter-reset:ln}
.code .ln{display:block;padding-left:34px;position:relative;white-space:pre}
.code .ln::before{counter-increment:ln;content:counter(ln);position:absolute;left:0;width:20px;text-align:right;color:#4B5263}
.code .ln.on{background:rgba(47,111,235,.12);margin:0 -18px;padding-left:52px;padding-right:18px}
.code .ln.on::before{left:18px}
.k{color:#FF7B72}.v{color:#79C0FF}.s{color:#A5D6FF}.p{color:#D2A8FF}.c{color:#6E7681}
.caret{display:inline-block;width:8px;height:15px;background:var(--accent-hi);vertical-align:-2px;animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}

.hero-side{display:grid;gap:28px;align-content:start}
.side-block h2{font-size:12.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px}
.side-block p{margin:0 0 6px;color:var(--muted);font-size:15px}
.side-block + .side-block{padding-top:28px;border-top:1px solid var(--line)}
.socials{display:flex;flex-wrap:wrap;gap:4px;margin-left:-10px}
.socials a{display:inline-grid;place-items:center;width:44px;height:44px;border-radius:10px;color:var(--fg);transition:background-color .15s,color .15s}
.socials a:hover{background:var(--surface);color:var(--accent-hi)}
.socials svg{width:20px;height:20px}

/* ---------- sections ---------- */
.band{background:var(--bg-2)}
.section .wrap{padding-block:80px}
.divider{border:0;border-top:1px solid var(--line);margin:0}

/* about */
.about-grid{display:grid;gap:40px}
.about-grid .about-text{color:var(--muted);margin:0 0 22px;font-size:17px}

/* skills */
.skill{background:var(--surface);border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;gap:12px;min-width:0}
.skill .ic{width:48px;height:48px;border-radius:12px;background:rgba(47,111,235,.14);color:var(--accent-hi);display:grid;place-items:center}
.skill .ic svg{width:24px;height:24px}
.skill p{margin:0;color:var(--muted);font-size:15px}

/* skills grid */
.skill-grid{display:grid;gap:16px}
.skill .link-arrow{margin-top:auto;align-self:flex-start}



/* process */
.steps{list-style:none;margin:0;padding:0;display:grid;gap:0;counter-reset:st}
.steps li{display:grid;grid-template-columns:56px 1fr;gap:4px 18px;padding:22px 0;border-top:1px solid var(--line)}
.steps li::before{counter-increment:st;content:counter(st,decimal-leading-zero);grid-row:span 2;font:700 15px/1.6 var(--f-mono);color:var(--accent-hi)}
.steps p{margin:0;color:var(--muted);font-size:15px}

/* faq */
.faq{display:grid;gap:0;border-bottom:1px solid var(--line)}
.faq details{border-top:1px solid var(--line)}
.faq summary{list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:64px;padding:14px 0;cursor:pointer;font-weight:700;font-size:17px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:400 26px/1 var(--f-sans);color:var(--accent-hi);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0 0 22px;color:var(--muted);max-width:44em}

/* contact */
.contact-grid{display:grid;gap:44px}
.contact h2{font-size:clamp(34px,6vw,56px);line-height:1.08;font-weight:800}
.contact h2 .hl{color:var(--accent-hi)}
.channels{display:grid;gap:12px;margin-top:28px}
.channel{display:flex;align-items:center;gap:16px;padding:16px 18px;background:var(--surface);border-radius:var(--radius);text-decoration:none;min-width:0;transition:background-color .15s}
.channel:hover{background:#2E3440}
.channel .ic{width:44px;height:44px;flex:none;border-radius:12px;background:rgba(47,111,235,.14);color:var(--accent-hi);display:grid;place-items:center}
.channel .ic svg{width:22px;height:22px}
.channel small{display:block;color:var(--muted);font-size:12.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.channel b{display:block;font-size:17px;overflow-wrap:anywhere}
form.brief{background:var(--surface);border-radius:var(--radius);padding:26px;display:grid;gap:18px;align-content:start}
.field{display:grid;gap:8px}
.field label{font-weight:600;font-size:14.5px}
.field input,.field select,.field textarea{width:100%;min-height:48px;padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--fg);font:400 16px/1.4 var(--f-sans)}
.field textarea{min-height:120px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent-hi);box-shadow:0 0 0 3px rgba(47,111,235,.25)}
.field .err{color:#FF8A80;font-size:13.5px;min-height:0}
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:#FF8A80}
.form-note{font-size:13.5px;color:var(--muted);margin:0}
.form-done{display:grid;gap:10px;padding:14px 16px;border-radius:10px;background:rgba(63,207,142,.1);border:1px solid rgba(63,207,142,.35);font-size:14.5px}
.form-done a{display:inline-flex;align-items:center;min-height:44px;color:var(--ok);font-weight:700}

/* footer */
.site-foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;padding-block:28px;color:var(--muted);font-size:14px;border-top:1px solid var(--line)}
.site-foot a{text-decoration:none}
.site-foot a:hover{color:var(--fg)}

/* floating WhatsApp (phones) */
.fab{position:fixed;right:max(16px,calc(env(safe-area-inset-right,0px) + 16px));bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:15;width:56px;height:56px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;box-shadow:0 10px 30px rgba(0,0,0,.45);transition:opacity .2s,transform .2s}
.fab svg{width:26px;height:26px}
.fab[data-hidden="true"]{opacity:0;transform:translateY(12px);pointer-events:none}

/* ---------- breakpoints ---------- */
@media (max-width:420px){.code pre{font-size:11.5px;padding-inline:14px}.code .ln{padding-left:28px}}

@media (min-width:960px){
  .nav,.btn.head-cta{display:inline-flex}
  .menu-btn,.mobile-nav{display:none!important}
  .hero .wrap{grid-template-columns:minmax(0,1fr) minmax(0,1.08fr) minmax(0,.6fr);align-items:center;gap:40px;padding-block:72px 96px}
  .hero-side{padding-left:8px}
  .about-grid{grid-template-columns:1.1fr 1fr;align-items:end;gap:64px}
  .skill-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .process-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px}
  .contact-grid{grid-template-columns:1fr 1fr;gap:64px}
  .fab{display:none}
}