/* energeiako — design system (Tesla-light / clean-tech energy)
   Φωτεινό, αισιόδοξο, με μέτρο. Ένα solar accent, πολύ λευκό, μεγάλη ήρεμη τυπογραφία.
   Πράσινο ΜΟΝΟ στα readouts εξοικονόμησης/CO₂. Όλα LCP-safe, reduced-motion-safe. */

/* ── Tokens ─────────────────────────────────────────────────────────────── */
:root{
  --paper:#ffffff;
  --paper-2:#f7f8fa;        /* ήπιο off-white για εναλλαγή ζωνών */
  --paper-3:#eef2f6;
  --ink:#0b1014;            /* near-black, καθαρό */
  --ink-2:#48555f;          /* muted body */
  --ink-3:#7a8893;          /* captions */
  --line:rgba(11,16,20,.10);
  --line-2:rgba(11,16,20,.16);

  --sun:#ff8a1e;            /* solar accent */
  --sun-2:#ff6a00;          /* βαθύτερο για gradient */
  --sun-3:#ffb35c;          /* φωτεινό */
  --sun-tint:#fff3e6;       /* πολύ ανοιχτό για backgrounds */
  --gold:#f5a300;

  --eco:#12a45f;            /* ΜΟΝΟ για εξοικονόμηση/CO₂ */
  --eco-tint:#e7f7ef;
  --sky:#2e7bd6;            /* δευτερεύον cool για δίκτυο/έγχυση */
  --sky-tint:#eaf2fc;

  --ok:#12a45f; --warn:#e6a200; --bad:#e23b3b;

  --r:14px; --r-lg:22px; --r-sm:10px; --r-pill:999px;
  --sh-1:0 1px 2px rgba(11,16,20,.05), 0 4px 14px rgba(11,16,20,.05);
  --sh-2:0 6px 22px rgba(11,16,20,.08), 0 2px 6px rgba(11,16,20,.05);
  --sh-3:0 20px 60px rgba(11,16,20,.12);
  --sh-sun:0 14px 40px rgba(255,122,0,.20);

  --max:1180px;
  --gut:clamp(18px,4vw,40px);
  --nav-h:64px;

  --ff:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --ff-mono:'JetBrains Mono','SF Mono',ui-monospace,'Cascadia Code',Menlo,Consolas,monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
}

/* ── Reset / base ───────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;font-family:var(--ff);color:var(--ink);background:var(--paper);
  font-size:clamp(16px,1.05vw,17.5px);line-height:1.65;letter-spacing:-.011em;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px;border-radius:4px}
::selection{background:var(--sun-tint);color:var(--sun-2)}
hr{border:0;border-top:1px solid var(--line);margin:0}

/* ── Type ───────────────────────────────────────────────────────────────── */
.display{
  font-size:clamp(2.6rem,7.2vw,5.4rem);line-height:.98;font-weight:800;
  letter-spacing:-.045em;margin:0;
}
h1,.h1{font-size:clamp(2.1rem,5vw,3.5rem);line-height:1.04;font-weight:800;letter-spacing:-.035em;margin:0}
h2,.h2{font-size:clamp(1.7rem,3.4vw,2.6rem);line-height:1.1;font-weight:780;letter-spacing:-.03em;margin:0}
h3,.h3{font-size:clamp(1.2rem,2vw,1.5rem);line-height:1.2;font-weight:700;letter-spacing:-.02em;margin:0}
.lead{font-size:clamp(1.1rem,1.7vw,1.36rem);line-height:1.5;color:var(--ink-2);font-weight:420;letter-spacing:-.015em}
.eyebrow{font:600 .8rem/1 var(--ff-mono);letter-spacing:.16em;text-transform:uppercase;color:var(--sun-2)}
.muted{color:var(--ink-2)} .cap{color:var(--ink-3);font-size:.86rem}
.mono{font-family:var(--ff-mono);font-feature-settings:'tnum' 1}
strong,b{font-weight:680}

/* ── Layout ─────────────────────────────────────────────────────────────── */
.wrap{max-width:var(--max);margin-inline:auto;padding-inline:var(--gut)}
.sec{padding:clamp(56px,9vw,120px) 0}
.sec-tight{padding:clamp(40px,6vw,72px) 0}
.band{background:var(--paper-2)}
.band-tint{background:linear-gradient(180deg,var(--sun-tint),#fff 70%)}
.sec-head{max-width:720px;margin-bottom:clamp(28px,4vw,52px)}
.sec-head .lead{margin-top:14px}
.grid{display:grid;gap:clamp(16px,2.4vw,26px)}
.cols-2{grid-template-columns:repeat(2,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
.cols-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:860px){.cols-3,.cols-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.cols-2,.cols-3,.cols-4{grid-template-columns:1fr}}

/* ── Buttons ────────────────────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;gap:.55em;justify-content:center;
  padding:.86em 1.4em;border-radius:var(--r-pill);font-weight:640;letter-spacing:-.01em;
  background:var(--ink);color:#fff;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .25s;
  will-change:transform;box-shadow:var(--sh-1)
}
.btn:hover{transform:translateY(-2px);box-shadow:var(--sh-2)}
.btn:active{transform:translateY(0)}
.btn-sun{background:linear-gradient(180deg,var(--sun-3),var(--sun));color:#3a1d00;box-shadow:var(--sh-sun)}
.btn-sun:hover{box-shadow:0 18px 48px rgba(255,122,0,.30)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line-2);box-shadow:none}
.btn-ghost:hover{background:var(--paper-2);border-color:var(--ink)}
.btn-lg{padding:1.02em 1.7em;font-size:1.05rem}
.btn svg{width:1.1em;height:1.1em}
.btn-arrow svg{transition:transform .3s var(--ease)}
.btn-arrow:hover svg{transform:translateX(4px)}

/* ── Nav ────────────────────────────────────────────────────────────────── */
.nav{
  position:sticky;top:0;z-index:60;height:var(--nav-h);display:flex;align-items:center;
  background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(16px);
  -webkit-backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid transparent;
  transition:border-color .3s,background .3s
}
.nav.scrolled{border-bottom-color:var(--line);background:rgba(255,255,255,.85)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;width:100%;gap:18px}
.brand{display:inline-flex;align-items:center;gap:.5em;font-weight:800;letter-spacing:-.03em;font-size:1.18rem}
.brand .sfx{color:var(--ink-3);font-weight:600}
.brand .mark{width:26px;height:26px;flex:0 0 auto}
.nav-links{display:flex;align-items:center;gap:clamp(10px,1.6vw,22px)}
.nav-links a{font-size:.95rem;font-weight:520;color:var(--ink-2);transition:color .2s;position:relative;padding:4px 0;white-space:nowrap}
.nav-links .btn{display:none}
.nav-links a:hover,.nav-links a[aria-current=page]{color:var(--ink)}
.nav-links a::after{content:"";position:absolute;left:0;right:100%;bottom:-2px;height:2px;background:var(--sun);transition:right .3s var(--ease);border-radius:2px}
.nav-links a:hover::after,.nav-links a[aria-current=page]::after{right:0}
.nav-cta{display:flex;align-items:center;gap:10px}
.nav-toggle{display:none;width:42px;height:42px;border-radius:12px;border:1px solid var(--line);align-items:center;justify-content:center}
.nav-toggle span{position:relative;width:18px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);border-radius:2px;transition:.3s}
.nav-toggle span::before{top:-6px}.nav-toggle span::after{top:6px}
body.menu-open .nav-toggle span{background:transparent}
body.menu-open .nav-toggle span::before{top:0;transform:rotate(45deg)}
body.menu-open .nav-toggle span::after{top:0;transform:rotate(-45deg)}
.scrollbar{position:fixed;top:0;left:0;height:3px;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--sun-3),var(--sun-2));z-index:70;will-change:transform}

@media (max-width:920px){
  .nav-toggle{display:flex}
  .nav-links{
    position:fixed;inset:var(--nav-h) 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:rgba(255,255,255,.97);backdrop-filter:blur(20px);padding:8px var(--gut) 22px;
    border-bottom:1px solid var(--line);transform:translateY(-120%);transition:transform .38s var(--ease);
    box-shadow:var(--sh-2);max-height:calc(100vh - var(--nav-h));overflow:auto
  }
  body.menu-open .nav-links{transform:translateY(0)}
  .nav-links a{padding:15px 4px;font-size:1.06rem;border-bottom:1px solid var(--line)}
  .nav-links a::after{display:none}
  .nav-links .btn{display:inline-flex;margin-top:14px}
  .nav-cta .btn-sun{display:none}
}

/* ── Cards ──────────────────────────────────────────────────────────────── */
.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(20px,2.6vw,30px);box-shadow:var(--sh-1)}
.card-pad{padding:clamp(22px,3vw,34px)}
.glow-grid{position:relative}
.glow{position:relative;overflow:hidden;transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s}
.glow::before{content:"";position:absolute;inset:0;border-radius:inherit;opacity:0;transition:opacity .35s;
  background:radial-gradient(340px circle at var(--mx,50%) var(--my,0%),rgba(255,138,30,.14),transparent 60%);pointer-events:none}
.glow:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--line-2)}
.glow:hover::before{opacity:1}
.feature .ic{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;background:var(--sun-tint);color:var(--sun-2);margin-bottom:16px}
.feature .ic svg{width:24px;height:24px}
.feature h3{margin-bottom:8px}
.feature p{color:var(--ink-2);margin:0;font-size:.98rem}

/* Steps */
.steps{counter-reset:s}
.step{display:flex;gap:18px;align-items:flex-start}
.step .n{counter-increment:s;flex:0 0 auto;width:44px;height:44px;border-radius:50%;display:grid;place-items:center;
  font:700 1.05rem/1 var(--ff-mono);background:var(--ink);color:#fff}
.step:nth-child(odd) .n{background:linear-gradient(180deg,var(--sun-3),var(--sun));color:#3a1d00}
.step .n::before{content:counter(s)}
.step h3{margin-bottom:6px}
.step p{margin:0;color:var(--ink-2)}

/* Stats */
.stat{display:flex;flex-direction:column;gap:4px}
.stat .v{font:800 clamp(2rem,4vw,3.1rem)/1 var(--ff-mono);letter-spacing:-.04em;color:var(--ink)}
.stat .v .u{font-size:.5em;color:var(--ink-3);font-weight:600}
.stat .k{color:var(--ink-2);font-size:.95rem}
.stat.eco .v{color:var(--eco)}

/* Badges */
.badge{display:inline-flex;align-items:center;gap:.45em;font:600 .76rem/1 var(--ff-mono);letter-spacing:.04em;
  text-transform:uppercase;padding:.5em .8em;border-radius:var(--r-pill);border:1px solid var(--line-2);color:var(--ink-2)}
.badge::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor}
.badge-open{color:var(--eco);background:var(--eco-tint);border-color:transparent}
.badge-soon{color:var(--sun-2);background:var(--sun-tint);border-color:transparent}
.badge-closed{color:var(--ink-3);background:var(--paper-3);border-color:transparent}

/* Pills / chips */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font:550 .85rem/1 var(--ff);padding:.55em .85em;border-radius:var(--r-pill);background:var(--paper-2);border:1px solid var(--line);color:var(--ink-2)}

/* Verify flag */
.verify{display:inline-flex;align-items:center;gap:.4em;font:600 .72rem/1 var(--ff-mono);color:var(--warn);
  background:#fff7e6;border:1px solid #ffe2ad;padding:.4em .6em;border-radius:8px}

/* Notice / disclaimer block */
.notice{display:flex;gap:14px;padding:18px 20px;border-radius:var(--r);background:var(--sky-tint);border:1px solid #cfe0f7}
.notice.warn{background:#fff7e6;border-color:#ffe2ad}
.notice .ic{flex:0 0 auto;color:var(--sky)}
.notice.warn .ic{color:var(--warn)}
.notice p{margin:0;font-size:.92rem;color:var(--ink-2)}

/* ── Hero ───────────────────────────────────────────────────────────────── */
.eh{position:relative;padding-top:clamp(40px,7vw,76px);padding-bottom:clamp(48px,8vw,90px);overflow:hidden}
.eh-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(28px,4vw,56px);align-items:center}
@media (max-width:940px){.eh-grid{grid-template-columns:1fr;gap:30px}}
.eh h1{margin-bottom:18px}
.eh .lead{max-width:46ch;margin-bottom:28px}
.eh-cta{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.eh-trust{display:flex;flex-wrap:wrap;gap:18px;margin-top:26px;color:var(--ink-3);font-size:.85rem}
.eh-trust span{display:inline-flex;align-items:center;gap:.45em}
.eh-trust svg{width:16px;height:16px;color:var(--eco)}

/* Mesh aura (light solar) + grain */
.aura{position:absolute;inset:-20% -10% auto -10%;height:140%;z-index:-1;pointer-events:none;filter:blur(46px);opacity:.9}
.aura b{position:absolute;border-radius:50%;mix-blend-mode:multiply;will-change:transform}
.aura .a1{width:46vw;height:46vw;left:-6vw;top:-8vw;background:radial-gradient(circle,rgba(255,179,92,.55),transparent 64%)}
.aura .a2{width:40vw;height:40vw;right:-4vw;top:-2vw;background:radial-gradient(circle,rgba(255,138,30,.40),transparent 62%)}
.aura .a3{width:34vw;height:34vw;left:30vw;top:10vw;background:radial-gradient(circle,rgba(46,123,214,.18),transparent 64%)}
.grain{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.035;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* Solar-day instrument (hero device-frame, energy bell-curve) */
.solar{position:relative;background:linear-gradient(170deg,#fff,#fbfcfe);border:1px solid var(--line);
  border-radius:var(--r-lg);box-shadow:var(--sh-3);padding:18px;overflow:hidden}
.solar-bar{display:flex;align-items:center;justify-content:space-between;font:600 .74rem/1 var(--ff-mono);color:var(--ink-3);margin-bottom:10px}
.solar-bar .live{display:inline-flex;align-items:center;gap:.45em;color:var(--eco)}
.solar-bar .live i{width:8px;height:8px;border-radius:50%;background:var(--eco);box-shadow:0 0 0 0 rgba(18,164,95,.5);animation:pulse 2.4s var(--ease) infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(18,164,95,.45)}70%{box-shadow:0 0 0 9px rgba(18,164,95,0)}100%{box-shadow:0 0 0 0 rgba(18,164,95,0)}}
.solar svg{width:100%;height:auto}
.solar-read{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.solar-read .r{background:var(--paper-2);border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.solar-read .r .v{font:800 1.25rem/1 var(--ff-mono);letter-spacing:-.03em}
.solar-read .r.self .v{color:var(--sun-2)} .solar-read .r.grid .v{color:var(--sky)} .solar-read .r.save .v{color:var(--eco)}
.solar-read .r .k{font-size:.74rem;color:var(--ink-3);margin-top:3px}

/* ── Reveal (no-JS safe; transform-only) ────────────────────────────────── */
.js .reveal{opacity:0;transform:translateY(20px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .reveal.in{opacity:1;transform:none}
/* Hero is LCP-critical: visible by default (opacity stays 1), transform-only rise, no JS gate. */
.js .eh .reveal{opacity:1;transform:none;animation:heroRise .8s var(--ease) both}
.js .eh .reveal.reveal-d2{animation-delay:.10s}
.js .eh .reveal.reveal-d3{animation-delay:.20s}
.js .eh .reveal.reveal-d4{animation-delay:.30s}
@keyframes heroRise{from{transform:translateY(18px)}to{transform:translateY(0)}}
.js .reveal-d2{transition-delay:.08s}.js .reveal-d3{transition-delay:.16s}.js .reveal-d4{transition-delay:.24s}
/* word reveal on headings */
.js .wreveal .w{display:inline-block;opacity:0;transform:translateY(.5em);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.js .wreveal.in .w{opacity:1;transform:none}

/* ── Footer ─────────────────────────────────────────────────────────────── */
.foot{background:var(--ink);color:#c7d0d6;padding:clamp(44px,6vw,72px) 0 30px}
.foot a{color:#c7d0d6;transition:color .2s}.foot a:hover{color:#fff}
.foot-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px;margin-bottom:36px}
@media (max-width:780px){.foot-top{grid-template-columns:1fr 1fr}}
@media (max-width:480px){.foot-top{grid-template-columns:1fr}}
.foot h4{color:#fff;font-size:.82rem;letter-spacing:.04em;text-transform:uppercase;margin:0 0 14px;font-family:var(--ff-mono)}
.foot ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px;font-size:.94rem}
.foot .brand{color:#fff;margin-bottom:12px}
.foot .brand .sfx{color:#7d8c93}
.foot-blurb{font-size:.92rem;color:#9aa6ad;max-width:34ch}
.foot-legal{border-top:1px solid rgba(255,255,255,.12);padding-top:22px;display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;font-size:.82rem;color:#8b979e}
.foot-disc{font-size:.8rem;color:#7d8a91;max-width:80ch;margin-top:14px;line-height:1.55}

/* ── Prose (pillars/articles) ───────────────────────────────────────────── */
.prose{max-width:72ch}
.prose>*+*{margin-top:1.1em}
.prose h2{margin-top:1.8em;scroll-margin-top:84px}
.prose h3{margin-top:1.4em}
.prose p{color:var(--ink-2)}
.prose ul,.prose ol{color:var(--ink-2);padding-left:1.3em;display:flex;flex-direction:column;gap:.5em}
.prose a{color:var(--sun-2);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1.5px}
.prose a:hover{color:var(--sun)}
.prose strong{color:var(--ink)}
.prose blockquote{border-left:3px solid var(--sun);padding-left:18px;color:var(--ink-2);font-style:italic;margin-left:0}
.answer{background:var(--sun-tint);border:1px solid #ffe2ad;border-radius:var(--r);padding:18px 20px;font-size:1.06rem;color:var(--ink);font-weight:480}
.toc{position:sticky;top:84px;align-self:start;font-size:.9rem}
.toc a{display:block;padding:5px 0;color:var(--ink-2);border-left:2px solid var(--line);padding-left:12px}
.toc a:hover{color:var(--ink);border-color:var(--sun)}
.article-grid{display:grid;grid-template-columns:1fr;gap:40px}
@media (min-width:1000px){.article-grid{grid-template-columns:220px 1fr;gap:54px}}

/* CTA band */
.cta-band{background:linear-gradient(120deg,var(--ink),#13202a);color:#fff;border-radius:var(--r-lg);padding:clamp(30px,5vw,56px);position:relative;overflow:hidden}
.cta-band h2{color:#fff;max-width:18ch}
.cta-band p{color:#aeb9c0;max-width:46ch;margin:14px 0 26px}
.cta-band .sunblob{position:absolute;right:-60px;top:-60px;width:280px;height:280px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,138,30,.6),transparent 65%);filter:blur(10px);pointer-events:none}

/* Article card */
.acard{display:flex;flex-direction:column;height:100%}
.acard .tag{font:600 .72rem/1 var(--ff-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--sun-2);margin-bottom:10px}
.acard h3{margin-bottom:8px}.acard p{color:var(--ink-2);font-size:.95rem;margin:0 0 16px}
.acard .more{margin-top:auto;font-weight:600;color:var(--ink);display:inline-flex;align-items:center;gap:.4em}
.acard .more svg{width:1em;height:1em;transition:transform .3s var(--ease)}
.acard:hover .more svg{transform:translateX(4px)}

/* Sticky mobile call/CTA bar */
.mbar{position:fixed;left:0;right:0;bottom:0;z-index:55;display:none;gap:10px;padding:10px var(--gut);
  background:rgba(255,255,255,.92);backdrop-filter:blur(14px);border-top:1px solid var(--line)}
.mbar .btn{flex:1}
@media (max-width:680px){.mbar{display:flex}body{padding-bottom:68px}}

/* ── Reduced motion ─────────────────────────────────────────────────────── */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .js .reveal,.js .wreveal .w{opacity:1!important;transform:none!important}
  .aura b{animation:none!important}
  .solar-bar .live i{animation:none}
}