/* ==========================================================================
   Sahan Tissera — SAP Technical Consultant
   Global stylesheet
   Palette: midnight navy base + electric blue accent (modern / trustworthy)
   ========================================================================== */

:root{
  --bg-dark:#070C1C;
  --navy:#0B1430;
  --navy-2:#0e1a3d;
  --bg:#ffffff;
  --surface:#f4f7fe;
  --surface-2:#eef3fd;
  --ink:#0a1736;
  --text:#3a4768;
  --muted:#6a7aa0;
  --line:#e4e9f6;
  --line-strong:#d2dbef;
  --blue:#2d6bff;
  --blue-bright:#5a8bff;
  --blue-deep:#1d4fd6;
  --cyan:#36c5f0;
  --on-dark:#e7ecfb;
  --on-dark-muted:#9bacd6;
  --glow:rgba(45,107,255,.45);
  --radius:14px;
  --maxw:1160px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;color:var(--text);
  background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;overflow-x:hidden;
}
h1,h2,h3,h4{font-family:'Space Grotesk',sans-serif;color:var(--ink);line-height:1.1;letter-spacing:-.015em}
a{color:inherit;text-decoration:none}
::selection{background:var(--blue);color:#fff}

.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.mono{font-family:'IBM Plex Mono',monospace;letter-spacing:.04em}

.eyebrow{
  font-family:'IBM Plex Mono',monospace;font-size:12px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--blue);
  display:inline-flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--blue),transparent)}
.on-dark .eyebrow{color:var(--blue-bright)}

/* dark section texture ----------------------------------------------------- */
.dark{position:relative;background:var(--bg-dark);color:var(--on-dark);isolation:isolate}
.dark h1,.dark h2,.dark h3,.dark h4{color:#fff}
.dark::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(rgba(120,150,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(120,150,255,.05) 1px,transparent 1px);
  background-size:54px 54px;mask-image:radial-gradient(120% 80% at 50% 0%,#000,transparent 75%);
}
.glow{position:absolute;border-radius:50%;filter:blur(90px);z-index:-1;pointer-events:none;opacity:.55}

/* nav ---------------------------------------------------------------------- */
header{position:sticky;top:0;z-index:60;background:var(--bg-dark);transition:background .3s,border-color .3s,backdrop-filter .3s;border-bottom:1px solid transparent}
header.scrolled{background:rgba(7,12,28,.82);backdrop-filter:blur(14px);border-color:rgba(120,150,255,.12)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{display:flex;align-items:center;gap:11px;font-family:'Space Grotesk';font-weight:700;color:#fff;font-size:16.5px}
.brand .mark{
  width:32px;height:32px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--blue),var(--cyan));color:#fff;
  font-family:'IBM Plex Mono';font-size:13px;box-shadow:0 4px 16px var(--glow);
}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-links a{font-size:14.5px;font-weight:500;color:var(--on-dark-muted);transition:color .2s}
.nav-links a:hover{color:#fff}
.btn{
  display:inline-flex;align-items:center;gap:8px;font-family:'Space Grotesk';font-weight:600;font-size:14.5px;
  padding:12px 22px;border-radius:10px;cursor:pointer;border:1px solid transparent;white-space:nowrap;
  transition:transform .15s var(--ease),background .2s,box-shadow .25s,color .2s,border-color .2s;
}
.btn-primary{background:linear-gradient(135deg,var(--blue),var(--blue-deep));color:#fff;box-shadow:0 6px 22px var(--glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px var(--glow)}
.btn-outline{background:rgba(255,255,255,.04);color:#fff;border-color:rgba(154,176,230,.32)}
.btn-outline:hover{border-color:var(--blue-bright);background:rgba(45,107,255,.12);transform:translateY(-2px)}
.nav-cta{display:flex;align-items:center;gap:14px}
.menu-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;color:#fff}

/* hero --------------------------------------------------------------------- */
.hero{padding:96px 0 90px;position:relative;overflow:hidden}
.hero .glow.g1{width:560px;height:560px;background:radial-gradient(circle,var(--blue),transparent 65%);top:-180px;right:-120px}
.hero .glow.g2{width:420px;height:420px;background:radial-gradient(circle,var(--cyan),transparent 65%);bottom:-200px;left:-140px;opacity:.32}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center;position:relative}
.hero h1{font-size:clamp(40px,5.6vw,66px);font-weight:700;margin:24px 0 24px;max-width:13ch;letter-spacing:-.02em}
.hero h1 .accent{background:linear-gradient(120deg,var(--blue-bright),var(--cyan));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lede{font-size:clamp(16px,1.55vw,18.5px);color:var(--on-dark-muted);max-width:48ch;margin-bottom:36px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-loc{margin-top:32px;display:flex;align-items:center;gap:10px;font-size:13.5px;color:var(--on-dark-muted)}
.pulse{width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 0 rgba(54,197,240,.6);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(54,197,240,.5)}70%{box-shadow:0 0 0 10px rgba(54,197,240,0)}100%{box-shadow:0 0 0 0 rgba(54,197,240,0)}}

/* glass stat panel */
.glasscard{
  position:relative;border-radius:20px;padding:28px;
  background:linear-gradient(160deg,rgba(255,255,255,.08),rgba(255,255,255,.02));
  border:1px solid rgba(154,176,230,.2);backdrop-filter:blur(16px);
  box-shadow:0 30px 70px -30px rgba(0,0,0,.7),inset 0 1px 0 rgba(255,255,255,.08);
}
.glasscard::before{content:"profile.sahan";position:absolute;top:16px;left:24px;font-family:'IBM Plex Mono';font-size:11px;letter-spacing:.1em;color:var(--on-dark-muted)}
.glass-status{position:absolute;top:14px;right:22px;display:flex;align-items:center;gap:7px;font-family:'IBM Plex Mono';font-size:11px;color:var(--cyan)}
.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:34px}
.stat{background:rgba(11,20,48,.5);border:1px solid rgba(154,176,230,.16);border-radius:13px;padding:17px 18px;transition:border-color .25s,transform .25s var(--ease)}
.stat:hover{border-color:var(--blue);transform:translateY(-3px)}
.stat .n{font-family:'Space Grotesk';font-weight:700;font-size:30px;color:#fff;line-height:1;background:linear-gradient(120deg,#fff,var(--blue-bright));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat .l{font-family:'IBM Plex Mono';font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--on-dark-muted);margin-top:9px}
.chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}
.chip{font-family:'IBM Plex Mono';font-size:11px;padding:5px 11px;border-radius:7px;background:rgba(45,107,255,.14);border:1px solid rgba(45,107,255,.3);color:#bcd0ff;letter-spacing:.03em}

/* clients (single-line: label + scrolling marquee band) -------------------- */
.clients{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:22px 0;overflow:hidden}
.clients-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:flex;align-items:center;gap:26px}
.clients .label{flex-shrink:0;white-space:nowrap;font-family:'IBM Plex Mono',monospace;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.marquee{flex:1;min-width:0;position:relative;overflow:hidden;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 6%,#000 90%,transparent);
          mask-image:linear-gradient(90deg,transparent,#000 6%,#000 90%,transparent)}
.marquee-track{display:flex;width:max-content;animation:marquee 32s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-group{display:flex;align-items:center;flex-shrink:0}
.marquee-group .client{font-family:'Space Grotesk';font-weight:600;font-size:16px;color:var(--ink);opacity:.72;white-space:nowrap;transition:opacity .2s}
.marquee-group .client:hover{opacity:1}
.marquee-group .dot{color:var(--blue);opacity:.55;margin:0 26px;font-size:9px}
@keyframes marquee{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* sections ----------------------------------------------------------------- */
.section{padding:104px 0}
.section-alt{background:var(--surface)}
.section-head{max-width:64ch;margin-bottom:50px}
.section-head h2{font-size:clamp(28px,3.6vw,42px);font-weight:700;margin:18px 0 14px}
.section-head p{color:var(--muted);font-size:17px}
.dark .section-head p{color:var(--on-dark-muted)}

/* about */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start}
.about-body p{margin-bottom:18px;font-size:16.5px;color:var(--text)}
.about-body p:last-child{margin-bottom:0}
.about-aside{position:relative;padding:28px;border-radius:16px;background:var(--surface);border:1px solid var(--line)}
.about-aside::before{content:"";position:absolute;left:0;top:24px;bottom:24px;width:3px;border-radius:3px;background:linear-gradient(var(--blue),var(--cyan))}
.about-aside h4{font-family:'IBM Plex Mono';font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:16px;font-weight:500;padding-left:18px}
.arow{padding:14px 0 14px 18px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:3px}
.arow:last-child{border-bottom:0;padding-bottom:0}
.arow .k{font-family:'Space Grotesk';font-weight:600;color:var(--ink);font-size:15.5px}
.arow .v{font-size:13.5px;color:var(--muted)}

/* expertise */
.skill-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.skill-card{position:relative;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px;overflow:hidden;transition:transform .28s var(--ease),box-shadow .28s,border-color .28s}
.skill-card::after{content:"";position:absolute;inset:0;background:radial-gradient(220px 120px at 80% -10%,rgba(45,107,255,.12),transparent 70%);opacity:0;transition:opacity .3s}
.skill-card:hover{transform:translateY(-5px);box-shadow:0 26px 50px -30px rgba(20,40,100,.4);border-color:var(--blue)}
.skill-card:hover::after{opacity:1}
.skill-card .idx{font-family:'IBM Plex Mono';font-size:12px;color:var(--blue);letter-spacing:.05em}
.skill-card h3{font-size:18.5px;margin:14px 0 16px;font-weight:600}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tag{font-family:'IBM Plex Mono';font-size:12px;color:var(--blue-deep);background:var(--surface-2);border:1px solid var(--line);padding:5px 10px;border-radius:7px;position:relative;z-index:1}

/* work */
.work-list{display:flex;flex-direction:column;gap:20px}
.case{display:grid;grid-template-columns:auto 1fr auto;gap:34px;align-items:start;background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:34px;transition:border-color .25s,box-shadow .25s,transform .25s var(--ease)}
.case:hover{border-color:var(--blue);box-shadow:0 28px 54px -32px rgba(20,40,100,.45);transform:translateY(-4px)}
.case-num{font-family:'IBM Plex Mono';font-size:13px;color:var(--blue);padding-top:5px}
.case h3{font-size:23px;font-weight:600;margin-bottom:13px}
.case p{color:var(--text);font-size:16px;max-width:62ch;margin-bottom:18px}
.case-side{text-align:right;min-width:130px}
.case-side .role{font-family:'Space Grotesk';font-weight:600;color:var(--ink);font-size:14px}
.case-side .org{font-size:13px;color:var(--muted);margin-top:4px}

/* experience (dark) */
#experience .glow.ge{width:480px;height:480px;background:radial-gradient(circle,var(--blue),transparent 65%);top:10%;right:-160px;opacity:.28}
.timeline{position:relative;max-width:860px;margin:0 auto;padding-left:8px}
.tl-item{position:relative;padding:0 0 40px 40px;border-left:1px solid rgba(154,176,230,.22)}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{content:"";position:absolute;left:-6px;top:4px;width:11px;height:11px;border-radius:50%;background:var(--bg-dark);border:2px solid var(--blue-bright)}
.tl-item.cur::before{background:var(--cyan);border-color:var(--cyan);box-shadow:0 0 0 5px rgba(54,197,240,.18)}
.tl-date{font-family:'IBM Plex Mono';font-size:12px;letter-spacing:.04em;color:var(--blue-bright);margin-bottom:7px}
.tl-item h3{font-size:19px;font-weight:600;color:#fff}
.tl-org{font-size:14.5px;color:var(--on-dark-muted);margin:4px 0 11px}
.tl-item p{font-size:15.5px;color:#c2cdec;max-width:64ch}

/* certs + education */
.cert-edu{display:grid;grid-template-columns:1.4fr 1fr;gap:56px;align-items:start}
.cert-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.cert{background:var(--bg);border:1px solid var(--line);border-radius:13px;padding:22px;display:flex;flex-direction:column;gap:13px;transition:border-color .22s,transform .22s var(--ease),box-shadow .22s}
.cert:hover{border-color:var(--blue);transform:translateY(-3px);box-shadow:0 20px 40px -28px rgba(20,40,100,.4)}
.cert .badge{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,rgba(45,107,255,.16),rgba(54,197,240,.16));color:var(--blue-deep);display:grid;place-items:center;font-family:'IBM Plex Mono';font-size:12px;border:1px solid rgba(45,107,255,.2)}
.cert h4{font-size:15px;font-weight:600;line-height:1.3}
.cert .when{font-family:'IBM Plex Mono';font-size:11.5px;color:var(--muted);margin-top:auto}
.edu-head{font-family:'IBM Plex Mono';font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:18px;font-weight:500}
.edu-card{background:var(--bg);border:1px solid var(--line);border-radius:13px;padding:22px;margin-bottom:16px}
.edu-card:last-child{margin-bottom:0}
.edu-card .deg{font-family:'Space Grotesk';font-weight:600;color:var(--ink);font-size:16px;line-height:1.3}
.edu-card .inst{font-size:14px;color:var(--muted);margin:6px 0 8px}
.edu-card .yr{font-family:'IBM Plex Mono';font-size:11.5px;color:var(--blue)}

/* contact (dark) */
#contact .glow.gc{width:560px;height:360px;background:radial-gradient(circle,var(--blue),transparent 65%);top:-120px;right:8%;opacity:.32}
.contact-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:52px;align-items:center;position:relative}
.contact h2{font-size:clamp(30px,4vw,46px);margin:18px 0 16px;font-weight:700}
.contact .lede{color:var(--on-dark-muted);font-size:17px;max-width:44ch}
.contact-actions{display:flex;flex-direction:column;gap:12px}
.clink{display:flex;align-items:center;gap:14px;background:rgba(255,255,255,.04);border:1px solid rgba(154,176,230,.18);border-radius:13px;padding:16px 18px;transition:background .2s,border-color .2s,transform .15s var(--ease)}
.clink:hover{background:rgba(45,107,255,.12);border-color:var(--blue);transform:translateX(4px)}
.clink .ico{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,rgba(45,107,255,.2),rgba(54,197,240,.2));color:var(--blue-bright);display:grid;place-items:center;flex-shrink:0}
.clink .ico svg{width:18px;height:18px}
.clink .ico.brand{background:transparent;padding:0;overflow:hidden}
.clink .ico.brand svg{width:40px;height:40px}
.clink .ct{display:flex;flex-direction:column;gap:3px}
.clink .ct .k{font-family:'IBM Plex Mono';font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--on-dark-muted)}
.clink .ct .v{font-family:'Space Grotesk';font-weight:600;color:#fff;font-size:15px}

/* footer */
footer{background:var(--bg-dark);color:var(--on-dark-muted);padding:34px 0;border-top:1px solid rgba(154,176,230,.12)}
.foot{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.foot .mono{font-size:13px}
.foot-links{display:flex;gap:22px}
.foot-links a{font-size:14px;color:var(--on-dark-muted);transition:color .2s}
.foot-links a:hover{color:#fff}

/* reveal animation */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* responsive --------------------------------------------------------------- */
@media (max-width:980px){
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .glasscard{max-width:480px}
  .about-grid,.cert-edu,.contact-grid{grid-template-columns:1fr;gap:36px}
  .skill-grid{grid-template-columns:1fr 1fr}
  .case{grid-template-columns:auto 1fr;gap:24px}
  .case-side{grid-column:1/-1;text-align:left;border-top:1px solid var(--line);padding-top:16px;display:flex;gap:20px;align-items:baseline}
  .case-side .org{margin-top:0}
}
@media (max-width:680px){
  .nav-links{display:none}
  .nav-cta .btn-outline{display:none}
  .menu-toggle{display:block}
  .nav-links.open{display:flex;flex-direction:column;align-items:flex-start;gap:2px;position:absolute;top:72px;left:0;right:0;background:rgba(7,12,28,.97);backdrop-filter:blur(14px);border-bottom:1px solid rgba(154,176,230,.14);padding:12px 24px}
  .nav-links.open a{padding:11px 0;width:100%;border-bottom:1px solid rgba(154,176,230,.1)}
  .section{padding:76px 0}
  .skill-grid,.cert-grid{grid-template-columns:1fr}
  .hero{padding:64px 0 60px}
  .clients-inner{gap:16px}.marquee-group .client{font-size:15px}.marquee-group .dot{margin:0 20px}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;animation:none!important}
  .reveal{opacity:1;transform:none;transition:none}
  .marquee-group.dup{display:none}
}

/* CV download modal -------------------------------------------------------- */
.modal[hidden]{display:none}
.modal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:20px}
.modal-backdrop{position:absolute;inset:0;background:rgba(4,8,20,.62);backdrop-filter:blur(6px)}
.modal-card{position:relative;width:100%;max-width:440px;max-height:92vh;overflow:auto;background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:32px;box-shadow:0 40px 90px -30px rgba(4,10,30,.6);animation:modalIn .28s var(--ease)}
@keyframes modalIn{from{opacity:0;transform:translateY(14px) scale(.985)}to{opacity:1;transform:none}}
.modal-card .eyebrow{color:var(--blue)}
.modal-card h3{font-size:22px;font-weight:600;margin:12px 0 6px}
.modal-sub{color:var(--muted);font-size:14.5px;margin-bottom:22px}
.modal-x{position:absolute;top:16px;right:16px;width:34px;height:34px;border:0;background:var(--surface);border-radius:9px;font-size:22px;line-height:1;color:var(--muted);cursor:pointer;transition:background .2s,color .2s}
.modal-x:hover{background:var(--surface-2);color:var(--ink)}
.field{margin-bottom:14px;display:flex;flex-direction:column;gap:6px}
.field label{font-family:'Space Grotesk';font-size:13px;font-weight:600;color:var(--ink)}
.field label span{color:var(--muted);font-weight:400}
.field input,.field select{width:100%;font-family:'Inter';font-size:15px;color:var(--ink);background:var(--surface);border:1px solid var(--line-strong);border-radius:10px;padding:11px 13px;transition:border-color .2s,box-shadow .2s}
.field input:focus,.field select:focus{outline:0;border-color:var(--blue);box-shadow:0 0 0 3px rgba(45,107,255,.15)}
.hp{position:absolute!important;left:-9999px!important;width:1px!important;height:1px!important;opacity:0!important;pointer-events:none}
.form-error{color:#b42318;background:#fdeceb;border:1px solid #f4c7c3;font-size:13.5px;padding:9px 12px;border-radius:9px;margin:2px 0 14px}
#cvForm .btn-primary{width:100%;justify-content:center;margin-top:6px}
#cvForm .btn-primary:disabled{opacity:.7;cursor:default}
.form-note{font-size:12px;color:var(--muted);text-align:center;margin-top:12px}