/* ==========================================================
   TUMELO RESOURCES — design tokens
   Palette derived from logo: dark navy + gold/bronze accent
   ========================================================== */
:root{
  --navy-950:#050e18;
  --navy-900:#0a1c30;
  --navy-800:#123055;
  --navy-700:#1c4270;
  --gold-600:#a87c2c;
  --gold-500:#c89b3c;
  --gold-300:#e6c877;
  --ivory:#f3efe4;
  --white:#ffffff;
  --slate:#8fa0b5;
  --slate-dark:#4a5568;
  --ink:#0d1b2a;

  --font-display:'Montserrat', sans-serif;
  --font-body:'EB Garamond', serif;
  --font-mono:'Montserrat', sans-serif;

  --container:1220px;
  --gutter:clamp(24px, 5vw, 72px);
  --radius:2px;

  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--ivory);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{
  font-family:var(--font-display);
  margin:0 0 .5em;
  line-height:1.08;
  letter-spacing:-.01em;
  color:var(--navy-900);
}
p{margin:0 0 1em;line-height:1.7;color:var(--slate-dark);}
ul{margin:0;padding:0;}
:focus-visible{outline:2px solid var(--gold-500);outline-offset:3px;}

.section-inner{
  max-width:var(--container);
  margin:0 auto;
  padding:0 var(--gutter);
}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; scroll-behavior:auto !important;}
}

/* ==========================================================
   LOADER
   ========================================================== */
#loader{
  position:fixed;inset:0;z-index:9999;
  background:radial-gradient(circle at 50% 40%, var(--navy-800), var(--navy-950) 75%);
  display:flex;align-items:center;justify-content:center;
  transition:opacity .7s var(--ease), visibility .7s var(--ease);
}
#loader.loader-hidden{opacity:0;visibility:hidden;pointer-events:none;}
.loader-inner{display:flex;flex-direction:column;align-items:center;gap:22px;}
.loader-mark{position:relative;width:64px;height:64px;display:flex;align-items:center;justify-content:center;}
.loader-logo{width:64px;height:64px;position:absolute;inset:0;}
.loader-ring{
  fill:none;stroke:var(--gold-500);stroke-width:2;
  stroke-dasharray:163;stroke-dashoffset:163;
  transform-origin:center;transform:rotate(-90deg);
  animation:ring-draw 1.6s var(--ease) infinite;
}
@keyframes ring-draw{
  0%{stroke-dashoffset:163;}
  50%{stroke-dashoffset:0;}
  100%{stroke-dashoffset:-163;}
}
.loader-initials{
  font-family:var(--font-display);font-weight:700;
  color:var(--gold-300);font-size:1.1rem;letter-spacing:.05em;
}
.loader-label{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.32em;
  color:var(--slate);text-transform:uppercase;
}
.loader-bar-track{width:160px;height:2px;background:rgba(255,255,255,.12);}
.loader-bar-fill{
  height:100%;width:0%;background:var(--gold-500);
  animation:bar-fill 1.8s var(--ease) forwards;
}
@keyframes bar-fill{ to{width:100%;} }

/* ==========================================================
   HEADER / NAV
   ========================================================== */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:500;
  transition:background .4s var(--ease), padding .4s var(--ease), box-shadow .4s var(--ease);
  padding:22px 0;
}
.site-header.scrolled{
  background:rgba(10,28,48,.92);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  padding:12px 0;
  box-shadow:0 8px 30px rgba(0,0,0,.18);
}
.header-inner{
  max-width:var(--container);margin:0 auto;padding:0 var(--gutter);
  display:flex;align-items:center;justify-content:space-between;gap:20px;
}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{height:38px;width:auto;}
.brand-word{
  font-family:var(--font-display);font-weight:600;
  font-size:.95rem;letter-spacing:.08em;color:var(--white);
  text-transform:uppercase;
}
.brand-word em{color:var(--gold-300);font-style:normal;font-weight:400;}
.main-nav{display:flex;align-items:center;gap:34px;}
.main-nav a{
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.06em;
  color:var(--ivory);opacity:.82;
  position:relative;padding:4px 0;transition:opacity .25s;
}
.main-nav a:hover{opacity:1;}
.main-nav a:not(.nav-cta)::after{
  content:'';position:absolute;left:0;bottom:-3px;width:0;height:1px;
  background:var(--gold-500);transition:width .3s var(--ease);
}
.main-nav a:not(.nav-cta):hover::after{width:100%;}
.nav-cta{
  border:1px solid var(--gold-500);padding:9px 18px !important;
  color:var(--gold-300) !important;opacity:1 !important;border-radius:var(--radius);
}
.nav-cta:hover{background:var(--gold-500);color:var(--navy-950) !important;}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:36px;height:36px;background:none;border:none;cursor:pointer;padding:0;
}
.nav-toggle span{display:block;height:2px;background:var(--white);border-radius:2px;transition:transform .3s var(--ease), opacity .3s;}

/* ==========================================================
   HERO
   ========================================================== */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:center;
  overflow:hidden;background:var(--navy-950);
  padding:110px 0 80px;
}
.hero-bg{
  position:absolute;inset:-10% -5%;
  background-size:cover;background-position:center;
  filter:saturate(0.85) brightness(.55);
}
.hero-veil{
  position:absolute;inset:0;
  background:linear-gradient(180deg, rgba(5,14,24,.55) 0%, rgba(5,14,24,.35) 40%, rgba(5,14,24,.92) 100%),
             linear-gradient(90deg, rgba(5,14,24,.75) 0%, rgba(5,14,24,.15) 55%);
}
.hero-strata{position:absolute;left:0;right:0;bottom:0;height:120px;z-index:1;pointer-events:none;}
.hero-strata span{
  position:absolute;left:0;right:0;height:2px;background:var(--gold-500);opacity:.35;
}
.hero-strata span:nth-child(1){bottom:80px;opacity:.18;}
.hero-strata span:nth-child(2){bottom:52px;opacity:.28;}
.hero-strata span:nth-child(3){bottom:28px;opacity:.4;}
.hero-strata span:nth-child(4){bottom:8px;opacity:.6;}
.hero-content{
  position:relative;z-index:2;max-width:760px;
  padding:0 var(--gutter);margin-left:clamp(0px, 4vw, 30px);
}
.eyebrow{
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.26em;
  text-transform:uppercase;color:var(--gold-300);margin:0 0 14px;
}
.eyebrow-dark{color:var(--gold-600);}
.hero h1{
  color:var(--white);font-size:clamp(1.9rem, 4.3vw, 3.6rem);
  font-weight:600;margin-bottom:.35em;
}
.hero h1 span{color:var(--gold-300);}
.hero-lede{
  color:rgba(243,239,228,.82);font-size:1.05rem;max-width:50ch;line-height:1.65;
  margin-bottom:1.7em;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;
  padding:13px 26px;border-radius:var(--radius);
  transition:transform .3s var(--ease), background .3s, color .3s, border-color .3s, box-shadow .3s;
  cursor:pointer;border:1px solid transparent;
}
.btn-gold{background:var(--gold-500);color:var(--navy-950);}
.btn-gold:hover{background:var(--gold-300);transform:translateY(-2px);box-shadow:0 10px 24px rgba(200,155,60,.28);}
.btn-ghost{border-color:rgba(243,239,228,.4);color:var(--ivory);}
.btn-ghost:hover{border-color:var(--gold-300);color:var(--gold-300);transform:translateY(-2px);}
.btn-block{width:100%;}

.scroll-cue{
  position:absolute;right:var(--gutter);bottom:38px;z-index:2;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.2em;
  color:rgba(243,239,228,.65);text-transform:uppercase;
}
.scroll-cue-line{width:1px;height:46px;background:linear-gradient(180deg, var(--gold-500), transparent);
  animation:cue-move 2s ease-in-out infinite;}
@keyframes cue-move{0%,100%{transform:scaleY(1);}50%{transform:scaleY(.6);}}

/* ==========================================================
   REVEAL ANIMATIONS
   ========================================================== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease), transform .8s var(--ease);}
.reveal.is-visible{opacity:1;transform:translateY(0);}

/* ==========================================================
   SECTION GENERIC
   ========================================================== */
.section{padding:min(14vw, 140px) 0;position:relative;}
.section h2{font-size:clamp(1.9rem, 3.4vw, 2.7rem);}

/* ==========================================================
   ABOUT
   ========================================================== */
.about{background:var(--ivory);}
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(30px,6vw,90px);align-items:center;}
.about-copy p{max-width:56ch;}
.about-stats{display:flex;gap:clamp(20px,4vw,48px);margin-top:36px;padding-top:28px;border-top:1px solid rgba(13,27,42,.12);}
.stat-num{display:block;font-family:var(--font-display);font-size:2.2rem;font-weight:700;color:var(--navy-900);}
.stat-label{font-family:var(--font-mono);font-size:.72rem;color:var(--slate-dark);letter-spacing:.03em;line-height:1.5;}
.about-media{position:relative;}
.about-img{
  width:100%;aspect-ratio:4/5;background-size:cover;background-position:center;
  border-radius:var(--radius);box-shadow:0 30px 60px -20px rgba(10,28,48,.35);
}
.about-img-caption{
  font-family:var(--font-mono);font-size:.68rem;color:var(--slate-dark);
  letter-spacing:.04em;margin-top:14px;
}

/* ==========================================================
   OPERATIONS
   ========================================================== */
.operations{background:var(--navy-950);color:var(--ivory);overflow:hidden;}
.operations-bg{position:absolute;inset:-10%;background-size:cover;background-position:center;opacity:.28;}
.operations-veil{position:absolute;inset:0;background:linear-gradient(180deg, var(--navy-950) 0%, rgba(5,14,24,.75) 40%, var(--navy-950) 100%);}
.operations .section-inner{position:relative;z-index:1;}
.operations h2{color:var(--white);max-width:16ch;margin-bottom:.7em;}
.operations .eyebrow{margin-bottom:14px;}
.ops-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(243,239,228,.12);margin-top:40px;border:1px solid rgba(243,239,228,.12);}
.ops-card{background:var(--navy-900);display:flex;flex-direction:column;transition:transform .4s var(--ease), background .4s;}
.ops-card:hover{transform:translateY(-6px);background:var(--navy-800);}
.ops-card-media{
  aspect-ratio:4/3;background-size:cover;background-position:center;
  filter:saturate(.9);position:relative;
}
.ops-card-media::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg, transparent 40%, rgba(5,14,24,.55));}
.ops-card-body{padding:26px 22px 30px;flex:1;display:flex;flex-direction:column;}
.ops-tag{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold-300);margin-bottom:10px;
}
.ops-card h3{color:var(--white);font-size:1.15rem;margin-bottom:.5em;}
.ops-card p{color:rgba(243,239,228,.68);font-size:.92rem;margin-bottom:0;}

/* ==========================================================
   VALUE CHAIN / CORE SAMPLE (signature element)
   ========================================================== */
.chain{background:var(--ivory);}
.chain-intro{max-width:60ch;font-size:1.05rem;}
.core-sample{
  margin-top:60px;display:grid;grid-template-columns:120px 1fr;gap:clamp(30px,6vw,70px);align-items:stretch;
}
.core-tube{
  position:relative;border-radius:60px;overflow:hidden;
  border:1px solid rgba(13,27,42,.18);box-shadow:inset 0 0 30px rgba(13,27,42,.12);
  display:flex;flex-direction:column;background:var(--white);
}
.core-layer{flex:1;position:relative;border-bottom:1px solid rgba(13,27,42,.1);}
.core-layer:last-child{border-bottom:none;}
.core-fill{position:absolute;inset:0;transform:scaleY(0);transform-origin:bottom;transition:transform 1s var(--ease);}
.core-layer[data-layer="extract"] .core-fill{background:linear-gradient(180deg,#3a5372,#12314f);}
.core-layer[data-layer="process"] .core-fill{background:linear-gradient(180deg,#c89b3c,#a87c2c);}
.core-layer[data-layer="trade"] .core-fill{background:linear-gradient(180deg,#0a1c30,#050e18);}
.core-sample.is-visible .core-fill{transform:scaleY(1);}
.core-sample.is-visible .core-layer[data-layer="process"] .core-fill{transition-delay:.25s;}
.core-sample.is-visible .core-layer[data-layer="trade"] .core-fill{transition-delay:.5s;}
.core-labels{display:flex;flex-direction:column;justify-content:space-between;gap:28px;}
.core-label{padding:6px 0;border-top:1px solid rgba(13,27,42,.12);}
.core-label:first-child{border-top:none;}
.core-label-index{
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold-600);
}
.core-label h4{margin:.35em 0 .3em;font-size:1.3rem;}
.core-label p{max-width:52ch;margin:0;}

@media (max-width:720px){
  .core-sample{grid-template-columns:56px 1fr;}
  .core-tube{border-radius:28px;}
}

/* ==========================================================
   VISION & VALUES
   ========================================================== */
.vision{background:var(--navy-950);color:var(--ivory);position:relative;overflow:hidden;}
.vision-bg{position:absolute;inset:-10%;background-size:cover;background-position:center;opacity:.22;}
.vision-veil{position:absolute;inset:0;background:linear-gradient(160deg, rgba(5,14,24,.94), rgba(10,28,48,.86));}
.vision-inner{position:relative;z-index:1;}
.vision-block h2{
  color:var(--white);font-weight:500;font-size:clamp(1.7rem,3.2vw,2.5rem);
  max-width:22ch;line-height:1.28;margin-bottom:.3em;
}
.mission-block{max-width:70ch;margin:34px 0 60px;padding-top:28px;border-top:1px solid rgba(243,239,228,.15);}
.mission-text{color:rgba(243,239,228,.78);font-size:1.05rem;}
.values-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:rgba(243,239,228,.14);border:1px solid rgba(243,239,228,.14);}
.value-card{background:rgba(10,28,48,.6);padding:30px 26px;transition:background .35s;}
.value-card:hover{background:rgba(200,155,60,.12);}
.value-card h4{color:var(--gold-300);font-size:1.05rem;margin-bottom:.4em;}
.value-card p{color:rgba(243,239,228,.68);font-size:.9rem;margin:0;}

@media (max-width:720px){
  .values-grid{grid-template-columns:1fr 1fr;}
}

/* ==========================================================
   WHY / DIFFERENTIATORS
   ========================================================== */
.why{background:var(--ivory);}
.why h2{max-width:20ch;margin-bottom:.9em;}
.why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:rgba(13,27,42,.1);border:1px solid rgba(13,27,42,.1);margin-top:10px;}
.why-item{background:var(--ivory);padding:30px 26px;display:flex;flex-direction:column;justify-content:center;min-height:150px;}
.why-item p{margin:0;font-size:.98rem;color:var(--navy-900);}
.why-media{grid-column:span 1;aspect-ratio:1;background-size:cover;background-position:center;min-height:150px;padding:0 !important;}

@media (max-width:900px){
  .why-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:560px){
  .why-grid{grid-template-columns:1fr;}
}

/* Compact hero on short viewports (small laptops, landscape phones) */
@media (max-height:720px){
  .hero{padding:90px 0 56px;}
  .hero h1{font-size:clamp(1.6rem, 3.6vw, 2.6rem);}
  .hero-lede{font-size:.98rem;line-height:1.55;margin-bottom:1.3em;}
  .btn{padding:11px 22px;}
  .eyebrow{margin-bottom:10px;}
  .scroll-cue{bottom:20px;}
}

/* ==========================================================
   CONTACT
   ========================================================== */
.contact{background:var(--navy-950);color:var(--ivory);}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,6vw,90px);}
.contact h2{color:var(--white);max-width:16ch;font-size:clamp(1.9rem,3.4vw,2.6rem);}
.contact-copy p{color:rgba(243,239,228,.72);max-width:44ch;}
.contact-details{display:flex;gap:40px;margin-top:36px;padding-top:28px;border-top:1px solid rgba(243,239,228,.15);}
.contact-details dt{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-300);margin-bottom:.4em;}
.contact-details dd{margin:0;color:rgba(243,239,228,.85);font-size:.94rem;}

.contact-form{display:flex;flex-direction:column;gap:18px;}
.form-row{display:flex;flex-direction:column;gap:8px;}
.form-row label{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:rgba(243,239,228,.6);}
.form-row input,.form-row textarea{
  background:rgba(243,239,228,.05);border:1px solid rgba(243,239,228,.22);
  color:var(--ivory);padding:13px 16px;font-family:var(--font-body);font-size:.95rem;
  border-radius:var(--radius);transition:border-color .25s, background .25s;resize:vertical;
}
.form-row input:focus,.form-row textarea:focus{border-color:var(--gold-500);background:rgba(243,239,228,.08);outline:none;}
.form-note{font-family:var(--font-mono);font-size:.78rem;color:var(--gold-300);min-height:1.2em;margin:0;}

/* ==========================================================
   FOOTER
   ========================================================== */
.site-footer{background:var(--navy-950);color:var(--ivory);padding-top:70px;border-top:1px solid rgba(243,239,228,.1);}
.footer-inner{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:50px;}
.footer-mark{height:32px;margin-bottom:14px;}
.footer-brand p{max-width:38ch;color:rgba(243,239,228,.6);font-size:.9rem;}
.footer-links{display:flex;gap:26px;flex-wrap:wrap;align-content:flex-start;}
.footer-links a{font-family:var(--font-mono);font-size:.78rem;color:rgba(243,239,228,.7);letter-spacing:.04em;transition:color .25s;}
.footer-links a:hover{color:var(--gold-300);}
.footer-base{
  border-top:1px solid rgba(243,239,228,.1);padding:22px var(--gutter);
  font-family:var(--font-mono);font-size:.7rem;color:rgba(243,239,228,.4);
  text-align:center;letter-spacing:.05em;
}

/* ==========================================================
   RESPONSIVE
   ========================================================== */
@media (max-width:980px){
  .about-grid{grid-template-columns:1fr;}
  .about-media{order:-1;}
  .ops-grid{grid-template-columns:repeat(2,1fr);}
  .contact-grid{grid-template-columns:1fr;}
}

@media (max-width:760px){
  .main-nav{
    position:fixed;top:0;right:0;bottom:0;width:min(78vw,320px);
    background:var(--navy-950);flex-direction:column;align-items:flex-start;
    padding:110px 32px 40px;gap:26px;
    transform:translateX(100%);transition:transform .4s var(--ease);
    box-shadow:-20px 0 50px rgba(0,0,0,.3);
  }
  .main-nav.open{transform:translateX(0);}
  .nav-toggle{display:flex;}
  .nav-cta{margin-top:6px;}
  .hero-content{max-width:100%;}
  .ops-grid{grid-template-columns:1fr;}
  .values-grid{grid-template-columns:1fr;}
  .core-sample{grid-template-columns:1fr;}
  .core-tube{width:56px;height:220px;margin-bottom:10px;}
}

.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.open span:nth-child(2){opacity:0;}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}