/* =====================================================
   v6 — IDE Dark Neon · readable Persian · scroll
   ===================================================== */

:root {
    --cyan: #22d3ee;
    --purple: #c084fc;
    --green: #4ade80;
    --amber: #fbbf24;
    --bg: #0a0e17;
    --bg-alt: #0f1520;
    --card: #111827;
    --card-hover: #1a2332;
    --text: #e6edf3;
    --text-muted: #8b98a9;
    --text-dim: #4a5a6e;
    --line: #1e2937;
    --line-hover: #334155;
    --radius: 14px;
    --radius-sm: 10px;
    --font: 'Vazirmatn', 'Tahoma', sans-serif;
    --mono: 'JetBrains Mono', 'Courier New', monospace;
    --tr: .35s cubic-bezier(.4,0,.2,1);
    --grad: linear-gradient(135deg, var(--cyan), var(--purple));
}

[data-theme="light"] {
    --cyan: #0891b2;
    --purple: #7c3aed;
    --green: #16a34a;
    --amber: #d97706;
    --bg: #f0f3f8;
    --bg-alt: #e5e9f0;
    --card: #ffffff;
    --card-hover: #f8fafc;
    --text: #0b1120;
    --text-muted: #4b5a72;
    --text-dim: #8b9ab0;
    --line: #d1d9e6;
    --line-hover: #b8c4d6;
}

*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; scroll-padding-top:72px; }
body {
    font-family:var(--font);
    background:var(--bg);
    color:var(--text);
    line-height:2.1;
    overflow-x:hidden;
    transition:background .5s,color .5s;
}
.mono{font-family:var(--mono);direction:ltr;display:inline-block;letter-spacing:.02em}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea{font-family:inherit;color:inherit;background:transparent;resize:vertical}
.accent{color:var(--cyan)}
::selection{background:var(--cyan);color:var(--bg)}

.container{width:100%;max-width:1100px;margin-inline:auto;padding-inline:24px}

/* ============ PROGRESS BAR ============ */
.progress{position:fixed;top:0;left:0;z-index:999;height:2px;background:var(--grad);width:0;transition:width .1s}

/* ============ PARTICLES ============ */
#particles{position:fixed;inset:0;z-index:0;pointer-events:none}

/* ============ HEADER ============ */
.header{position:fixed;top:0;inset-inline:0;z-index:100;height:64px;transition:background .4s,backdrop-filter .4s,border-color .4s;border-bottom:1px solid transparent}
.header.scrolled{background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(12px);border-color:var(--line)}
.nav{height:100%;display:flex;align-items:center;justify-content:space-between;gap:20px}
.nav__logo{display:flex;align-items:center;gap:10px;font-size:.85rem;color:var(--text-muted)}
.nav__logo-mark{color:var(--cyan);font-weight:700;font-size:1rem;position:relative}
.nav__logo-name{color:var(--text)}
.nav__logo-cursor{color:var(--cyan);animation:blink .8s infinite;font-size:.8rem;margin-inline-start:2px}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.2}}
.nav__menu{display:flex;align-items:center;gap:2px}
.nav__link{padding:8px 14px;font-size:.88rem;font-weight:500;color:var(--text-muted);border-radius:8px;transition:color .3s}
.nav__link:hover{color:var(--text)}
.nav__link.active{color:var(--cyan);font-weight:700}
.nav__actions{display:flex;align-items:center;gap:8px}
.theme-toggle{width:34px;height:34px;display:grid;place-items:center;border-radius:8px;color:var(--text-dim);border:1px solid var(--line);transition:all .3s}
.theme-toggle:hover{color:var(--cyan);border-color:var(--line-hover)}
.theme-toggle .icon-moon{display:none}
[data-theme="dark"] .theme-toggle .icon-sun{display:none}
[data-theme="dark"] .theme-toggle .icon-moon{display:block}
.nav__toggle{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer}
.nav__toggle span{width:20px;height:1.5px;border-radius:2px;background:var(--text);transition:var(--tr)}
.nav__toggle.open span:nth-child(1){transform:translateY(6.5px)rotate(45deg)}
.nav__toggle.open span:nth-child(2){opacity:0}
.nav__toggle.open span:nth-child(3){transform:translateY(-6.5px)rotate(-45deg)}

/* ============ HERO ============ */
.hero{min-height:100vh;display:flex;align-items:center;position:relative;padding:90px 0 60px}
.hero__grid{display:grid;grid-template-columns:1.2fr 1fr;gap:50px;align-items:center;position:relative;z-index:2}
.hero__code{font-size:.78rem;color:var(--text-dim);margin-bottom:14px;display:block}
.hero__title{font-size:clamp(2.5rem,7vw,4.5rem);font-weight:900;line-height:1.15;margin-bottom:8px}
.hero__type{font-size:clamp(1rem,2vw,1.3rem);color:var(--text-muted);margin-bottom:20px;min-height:2em;display:flex;align-items:center;gap:8px}
.hero__type-sign{color:var(--green);animation:blink 1.2s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.4}}
.hero__type-cursor{color:var(--cyan);margin-inline-start:2px;animation:blink .8s infinite}
.hero__desc{color:var(--text-muted);font-size:1.02rem;max-width:520px;line-height:2;margin-bottom:28px}
.hero__cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:30px}
.hero__socials{display:flex;gap:8px}
.social{width:38px;height:38px;display:grid;place-items:center;border-radius:10px;border:1px solid var(--line);color:var(--text-muted);transition:all .3s}
.social:hover{color:var(--cyan);border-color:var(--cyan);box-shadow:0 0 20px rgba(34,211,238,.15)}

/* Code block visual */
.hero__codeblock{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.4)}
.hero__codeblock-head{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--bg-alt)}
.hero__codeblock-title{font-size:.65rem;color:var(--text-dim);margin-inline-start:auto}
.dot{width:8px;height:8px;border-radius:50%}
.dot--r{background:#ef4444}
.dot--y{background:#f59e0b}
.dot--g{background:#22c55e}
.hero__codeblock-body{font-size:.82rem;line-height:1.9;padding:16px 18px;color:var(--text-muted);white-space:pre-wrap;direction:ltr;text-align:left}
.c-keyword{color:var(--purple)}
.c-var{color:var(--cyan)}
.c-string{color:var(--green)}
.c-bool{color:var(--amber)}
.c-num{color:var(--amber)}
.c-comment{color:var(--text-dim)}

.hero__scroll{position:absolute;bottom:24px;inset-inline-start:50%;transform:translateX(-50%)}
.mouse{width:24px;height:38px;border:2px solid var(--text-dim);border-radius:12px;display:flex;justify-content:center;padding-top:6px}
.wheel{width:3px;height:7px;border-radius:3px;background:var(--cyan);animation:wheel 1.6s ease infinite}
@keyframes wheel{0%{transform:translateY(0);opacity:1}100%{transform:translateY(12px);opacity:0}}

/* ============ SECTION ============ */
.section{padding:100px 0;position:relative;z-index:2}
.section--alt{background:var(--bg-alt)}
.section__head{text-align:center;max-width:600px;margin:0 auto 48px}
.section__tag{font-size:.72rem;color:var(--cyan);margin-bottom:12px;display:block}
.section__title{font-size:clamp(1.6rem,4vw,2.4rem);font-weight:900;margin-bottom:8px}
.section__sub{color:var(--text-muted);font-size:.95rem}

/* ============ ABOUT (build log) ============ */
.about{max-width:700px;margin:0 auto}
.about__code{background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);padding:22px 24px;font-size:.82rem;line-height:2.3;direction:ltr;text-align:left;font-family:var(--mono)}
.about__line{color:var(--text-muted)}
.about__line .c-dim{color:var(--text-dim)}
.about__line .c-green{color:var(--green)}
.about__line .c-yellow{color:var(--amber)}
.about__cursor{color:var(--cyan);animation:blink .8s infinite;font-family:var(--mono)}

/* ============ SKILLS ============ */
.skills{display:grid;grid-template-columns:1fr 1.1fr;gap:40px;align-items:center}
.skill{margin-bottom:22px}
.skill__head{display:flex;justify-content:space-between;margin-bottom:8px;font-weight:600;font-size:.95rem}
.skill__head .mono{color:var(--cyan);font-size:.8rem}
.skill__track{height:8px;border-radius:99px;background:var(--bg);border:1px solid var(--line);overflow:hidden}
.skill__fill{height:100%;width:0;border-radius:99px;background:var(--grad);transition:width 1.2s ease}
.skill__fill--inf{background:linear-gradient(90deg,var(--cyan),var(--purple),var(--amber),var(--cyan));background-size:200% 100%;animation:inf-flow 3s linear infinite}
@keyframes inf-flow{0%{background-position:0% 0}100%{background-position:200% 0}}
.skills__chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{padding:8px 18px;border-radius:99px;background:var(--card);border:1px solid var(--line);font-size:.82rem;color:var(--text-muted);transition:all .3s}
.chip:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-3px)}

/* ============ PROJECTS ============ */
.projects{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.project{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:all .4s;transform-style:preserve-3d;position:relative;overflow:hidden}
.project::before{content:'';position:absolute;top:0;inset-inline:0;height:2px;background:var(--grad);transform:scaleX(0);transform-origin:right;transition:transform .5s}
.project:hover{border-color:var(--line-hover);transform:translateY(-6px);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.project:hover::before{transform:scaleX(1)}
.project__top{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.project__name{font-size:.72rem;color:var(--cyan);font-weight:600}
.project__lang{font-size:.6rem;padding:3px 8px;border-radius:99px;background:var(--bg-alt);border:1px solid var(--line);color:var(--text-dim)}
.project__title{font-size:1.15rem;font-weight:700;margin-bottom:8px}
.project__desc{color:var(--text-muted);font-size:.9rem;margin-bottom:16px;line-height:1.9}
.project__tags{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.project__tags span{font-size:.68rem;padding:4px 10px;border-radius:99px;border:1px solid var(--line);color:var(--text-dim)}
.project__demo{font-size:.7rem;padding:4px 12px;border-radius:99px;background:var(--grad);color:#fff;font-weight:700;transition:opacity .3s}
.project__demo:hover{opacity:.8}

/* ============ GUESTBOOK ============ */
.signal{display:grid;grid-template-columns:1.4fr 1fr;gap:30px;align-items:start}
.signal__form{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;display:flex;flex-direction:column;gap:16px}
.signal__term{background:#0a0a09;border:1px solid var(--line);border-radius:var(--radius-sm);padding:20px;font-size:.82rem;display:flex;flex-direction:column;gap:14px;direction:ltr;text-align:left}
.signal__line{color:var(--text-muted);display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.signal__line .c-dim{color:var(--text-dim)}
.signal__line .c-var{color:var(--cyan)}
.signal__line .c-green{color:var(--green)}
.signal__line input,.signal__line textarea{flex:1;min-width:140px;background:var(--bg-alt);border:1px solid var(--line);border-radius:6px;padding:8px 10px;font-size:.8rem;font-family:var(--mono);color:var(--text);resize:vertical}
.signal__line input:focus,.signal__line textarea:focus{outline:none;border-color:var(--cyan)}
.signal__send{align-self:flex-start;color:var(--green);font-family:var(--mono);font-size:.8rem;padding:8px 4px;transition:opacity .3s}
.signal__send:hover{opacity:.7}
.signal__status{min-height:1.6em;font-size:.75rem;color:var(--text-dim)}
.signal__status.success{color:var(--green)}
.signal__status.error{color:#f87171}
.signal__info{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;font-size:.78rem;display:flex;flex-direction:column;gap:12px}
.signal__empty{color:var(--text-dim);margin-top:8px;border-top:1px solid var(--line);padding-top:12px}
.signal__honeypot{position:absolute;left:-9999px;opacity:0}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:.72rem;color:var(--text-muted)}
.field input,.field textarea{background:var(--bg-alt);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;font-size:.95rem;transition:all .3s;width:100%}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(34,211,238,.1)}

/* ============ CONTACT ============ */
.contact{text-align:center;max-width:600px;margin:0 auto}
.contact__head{margin-bottom:36px}
.contact__links{display:flex;flex-direction:row;flex-wrap:nowrap;gap:12px;justify-content:center;align-items:center}
.contact__card{
    display:grid;place-items:center;flex:0 0 auto;
    width:56px;height:56px;
    background:var(--card);border:1px solid var(--line);border-radius:14px;
    transition:all .3s;
}
.contact__card:hover{
    border-color:var(--cyan);color:var(--cyan);
    transform:translateY(-4px);
    box-shadow:0 0 24px rgba(34,211,238,.14);
}
.contact__card-icon{color:var(--text);transition:color .3s;display:grid;place-items:center}
.contact__card:hover .contact__card-icon{color:var(--cyan)}

/* ============ FOOTER ============ */
.footer{border-top:1px solid var(--line);padding:24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:var(--text-dim);font-size:.72rem;position:relative;z-index:2;max-width:1100px;margin:0 auto}

/* ============ TO TOP ============ */
.to-top{position:fixed;bottom:24px;inset-inline-end:24px;z-index:90;width:42px;height:42px;border-radius:12px;background:var(--grad);color:#fff;font-size:1.1rem;box-shadow:0 4px 20px rgba(34,211,238,.3);opacity:0;visibility:hidden;transform:translateY(16px);transition:all .4s}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{transform:translateY(-4px)}

/* ============ BUTTONS ============ */
.btn{display:inline-block;padding:12px 26px;border-radius:12px;font-weight:600;font-size:.92rem;transition:all .3s;border:1px solid transparent}
.btn--primary{background:var(--grad);color:#fff;box-shadow:0 0 20px rgba(34,211,238,.15)}
.btn--primary:hover{transform:translateY(-3px);box-shadow:0 8px 40px rgba(34,211,238,.3)}
.btn--ghost{border-color:var(--line);color:var(--text-muted)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}

/* ============ BLOG (frames) ============ */
.frames{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px}
.frame-post{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:all .3s;display:flex;flex-direction:column}
.frame-post:hover{border-color:var(--cyan);transform:translateY(-4px);box-shadow:0 0 24px rgba(34,211,238,.08)}
.frame-post__meta{display:flex;align-items:center;gap:10px;margin-bottom:12px;font-size:.66rem}
.frame-post__tag{padding:3px 10px;border-radius:99px;background:var(--bg-alt);border:1px solid var(--line);color:var(--cyan)}
.frame-post__date{color:var(--text-dim)}
.frame-post__title{font-size:1.05rem;font-weight:700;margin-bottom:8px;line-height:1.6}
.frame-post__excerpt{color:var(--text-muted);font-size:.86rem;line-height:1.9;flex:1;margin-bottom:12px}
.frame-post__link{color:var(--cyan);font-size:.78rem}
.frame-post__link:hover{text-decoration:underline}

/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}

/* ============ RESPONSIVE ============ */
@media(max-width:900px){
    .hero__grid{grid-template-columns:1fr;text-align:center}
    .hero__desc{margin-inline:auto}
    .hero__cta,.hero__socials{justify-content:center}
    .hero__codeblock{display:none}
    .about,.skills,.signal{grid-template-columns:1fr}
    .signal__info{margin-top:0}
    .contact__links{flex-wrap:wrap}
}
@media(max-width:768px){
    .section{padding:70px 0}
    .nav__toggle{display:flex}
    .nav__menu{position:fixed;top:64px;inset-inline:0;flex-direction:column;align-items:stretch;gap:2px;padding:20px;background:color-mix(in srgb,var(--bg) 96%,transparent);backdrop-filter:blur(16px);transform:translateY(-120%);transition:transform .4s;z-index:99}
    .nav__menu.open{transform:translateY(0)}
    .nav__link{display:block;padding:14px;text-align:center;font-size:1rem}
    .skills__bars{order:1}
}
@media(max-width:480px){
    .hero__scroll{display:none}
    .footer{flex-direction:column;text-align:center}
    .letterbox__t{height:14px}
    .letterbox__b{height:14px}
    .hero__thought{font-size:.66rem;text-align:start}
}
@media(prefers-reduced-motion:reduce){
    *{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
    html{scroll-behavior:auto}
}

/* =====================================================
   v6.1 — subtle details: cinema · space · thought
   ===================================================== */

/* film grain overlay (cinema) */
.grain{position:fixed;inset:-20%;z-index:1;pointer-events:none;opacity:.025;
background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
animation:grain .5s steps(4) infinite}
@keyframes grain{0%{transform:translate(0,0)}25%{transform:translate(-2%,2%)}50%{transform:translate(2%,-2%)}75%{transform:translate(-1%,-1%)}100%{transform:translate(0,0)}}

/* 24fps timecode (cinema) */
.timecode{position:fixed;bottom:14px;inset-inline-start:18px;z-index:60;font-size:.58rem;color:var(--text-dim);letter-spacing:.15em;pointer-events:none}

/* scene number in section tag (cinema structure) */
.section__tag::after{content:'';display:inline-block;width:22px;height:1px;background:var(--line-hover);vertical-align:middle;margin-inline-start:8px}

/* orbit ring around logo (space) */
.nav__logo-mark{position:relative}
.nav__logo-mark::after{content:'';position:absolute;inset:-8px;border:1px solid transparent;border-top-color:var(--cyan);border-inline-start-color:var(--purple);border-radius:8px;opacity:.5;animation:orbit 7s linear infinite}
@keyframes orbit{to{transform:rotate(360deg)}}

/* shooting star sweep across hero (space) */
.hero::before{content:'';position:absolute;top:18%;inset-inline-start:-20%;width:140px;height:1.5px;z-index:1;
background:linear-gradient(90deg,transparent,var(--cyan),transparent);
transform:rotate(-30deg);
animation:shoot 9s ease-in-out infinite}
@keyframes shoot{
    0%,78%{transform:translate(0,0) rotate(-30deg);opacity:0}
    82%{transform:translate(30vw,17vh) rotate(-30deg);opacity:1}
    86%,100%{transform:translate(65vw,37vh) rotate(-30deg);opacity:0}
}

/* cycling thought in footer (philosophy) */
.footer__thought{color:var(--text-dim);font-style:italic;transition:opacity .6s;min-height:1.4em;max-width:420px;text-align:center}

/* cinematic letterbox (fixed, subtle) */
.letterbox{position:fixed;inset:0;z-index:5;pointer-events:none}
.letterbox__t,.letterbox__b{position:absolute;inset-inline:0;background:rgba(0,0,0,.55);opacity:0;transition:opacity .8s ease}
.letterbox__t{top:0;height:26px}
.letterbox__b{bottom:0;height:26px}
body.scrolled .letterbox__t,body.scrolled .letterbox__b{opacity:1}

/* hero thought (philosophy) */
.hero__thought{display:inline-flex;align-items:center;gap:8px;font-size:.72rem;color:var(--text-dim);margin-top:2px;max-width:480px;line-height:1.9;transition:opacity .5s}
.hero__thought-icon{color:var(--cyan);font-size:.85rem}