/* ==========================================================================
   Slate Crest Path — Shared Stylesheet
   静山路 — Editorial Japanese Mountain Trail Aesthetic
   ========================================================================== */

:root{
  --slate:        #4a5560;
  --slate-dark:   #2b3138;
  --slate-deep:   #1b1f24;
  --forest:       #3f5c46;
  --forest-dark:  #263a2b;
  --beige:        #ece4d6;
  --beige-light:  #f8f4ec;
  --cedar:        #8a5a3b;
  --cedar-dark:   #6b4429;
  --mist:         #b9c8cc;
  --mist-soft:    #dbe5e6;
  --ink:          #23262b;
  --paper:        #faf7f1;
  --gold:         #c8a25a;
  --shadow-soft: 0 20px 60px -20px rgba(27,31,36,.35);
  --ease: cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:'Jost', sans-serif;
  color:var(--ink);
  background:var(--paper);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{text-decoration:none;color:inherit;}
ul{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4{margin:0;font-weight:600;}
.font-display{font-family:'Fraunces',serif;}
.font-jp{font-family:'Shippori Mincho',serif;}
.font-jp-sans{font-family:'Zen Kaku Gothic New',sans-serif;}
.tracking-wide2{letter-spacing:.35em;}

/* ---------- Mist / Ambient Layers ---------- */
.mist-layer{
  position:fixed;inset:0;pointer-events:none;z-index:2;
  background:
    radial-gradient(ellipse 60% 40% at 20% 30%, rgba(255,255,255,.05), transparent 60%),
    radial-gradient(ellipse 50% 30% at 80% 70%, rgba(255,255,255,.04), transparent 60%);
  opacity:.6;
}
.mist-drift{
  position:absolute;inset:-10% -10%;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='800' height='200'%3E%3Cfilter id='b'%3E%3CfeGaussianBlur stdDeviation='40'/%3E%3C/filter%3E%3Cg filter='url(%23b)' fill='%23ffffff' fill-opacity='0.18'%3E%3Cellipse cx='150' cy='100' rx='180' ry='40'/%3E%3Cellipse cx='550' cy='60' rx='220' ry='50'/%3E%3Cellipse cx='700' cy='140' rx='150' ry='35'/%3E%3C/g%3E%3C/svg%3E");
  background-repeat:repeat-x;background-size:900px 220px;
  animation:driftMist 38s linear infinite;
  mix-blend-mode:screen;
}
.mist-drift.slow{animation-duration:60s;opacity:.5;background-size:1200px 260px;}
@keyframes driftMist{from{transform:translateX(0);}to{transform:translateX(-50%);}}

.sunlight-glow{
  position:absolute;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle, rgba(255,224,178,.55) 0%, rgba(255,224,178,0) 70%);
  animation:sunPulse 7s ease-in-out infinite;
  filter:blur(2px);
}
@keyframes sunPulse{0%,100%{opacity:.55;transform:scale(1);}50%{opacity:.85;transform:scale(1.08);}}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(36px);transition:opacity 1s var(--ease),transform 1s var(--ease);}
.reveal.is-visible{opacity:1;transform:translateY(0);}
.reveal-scale{opacity:0;transform:scale(.94);transition:opacity 1.1s var(--ease),transform 1.1s var(--ease);}
.reveal-scale.is-visible{opacity:1;transform:scale(1);}
.stagger > *{transition-delay:calc(var(--i,0) * 120ms);}

/* ---------- Navigation ---------- */
.site-nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  padding:22px 5%;
  display:flex;align-items:center;justify-content:space-between;
  transition:background .5s var(--ease),padding .4s var(--ease),box-shadow .4s var(--ease);
  background:linear-gradient(to bottom, rgba(20,22,20,.45), transparent);
}
.site-nav.scrolled{
  background:rgba(250,247,241,.86);
  backdrop-filter:blur(14px);
  padding:12px 5%;
  box-shadow:0 6px 30px -12px rgba(0,0,0,.15);
}
.site-nav.scrolled .nav-link,.site-nav.scrolled .logo-word,.site-nav.scrolled .logo-jp{color:var(--slate-deep);}
.site-nav.scrolled .logo-mark path,.site-nav.scrolled .logo-mark line{stroke:var(--forest-dark);}
.nav-link{color:#fff;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;position:relative;padding:6px 0;transition:color .3s;}
.nav-link::after{content:'';position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--gold);transition:width .35s var(--ease);}
.nav-link:hover::after,.nav-link.active::after{width:100%;}
.nav-link.active{color:var(--gold);}
.logo-word{color:#fff;font-size:1.28rem;letter-spacing:.06em;transition:color .3s;}
.logo-jp{color:#fff;font-size:.68rem;letter-spacing:.3em;opacity:.85;transition:color .3s;}
.logo-mark path,.logo-mark line{stroke:#fff;transition:stroke .3s;}

#mobile-menu{transition:max-height .5s var(--ease), opacity .4s;}

/* ---------- Buttons ---------- */
.btn-nature{
  display:inline-flex;align-items:center;gap:10px;
  padding:15px 34px;border-radius:2px;
  font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;
  transition:transform .45s var(--ease), box-shadow .45s var(--ease), background .45s, color .45s;
  position:relative;overflow:hidden;
}
.btn-primary{background:var(--forest);color:#fdfaf3;}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 18px 34px -12px rgba(63,92,70,.55);}
.btn-outline{border:1px solid rgba(255,255,255,.65);color:#fff;background:rgba(255,255,255,.04);backdrop-filter:blur(4px);}
.btn-outline:hover{background:#fff;color:var(--slate-deep);transform:translateY(-3px);}
.btn-outline.dark{border-color:var(--slate-dark);color:var(--slate-dark);}
.btn-outline.dark:hover{background:var(--slate-dark);color:#fff;}

/* ---------- Glass Panels ---------- */
.glass{
  background:rgba(255,255,255,.5);
  backdrop-filter:blur(16px);
  border:1px solid rgba(255,255,255,.6);
  box-shadow:var(--shadow-soft);
}
.glass-dark{
  background:rgba(27,31,36,.4);
  backdrop-filter:blur(16px);
  border:1px solid rgba(255,255,255,.12);
}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:flex-end;overflow:hidden;
}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.08);animation:heroZoom 22s ease-in-out infinite alternate;}
@keyframes heroZoom{from{transform:scale(1.08);}to{transform:scale(1.16);}}
.hero-scrim{position:absolute;inset:0;background:linear-gradient(180deg, rgba(20,24,22,.25) 0%, rgba(20,24,22,.15) 35%, rgba(15,18,16,.75) 100%);}
.hero-inner{position:relative;z-index:5;width:100%;padding:0 5% 9vh;}
.ridge-parallax{position:absolute;left:0;right:0;bottom:0;height:22vh;background:linear-gradient(180deg, transparent, var(--paper) 92%);z-index:3;}

/* ---------- Section headers ---------- */
.eyebrow{font-size:.72rem;letter-spacing:.32em;text-transform:uppercase;color:var(--cedar);font-weight:500;}
.section-title{font-family:'Fraunces',serif;font-size:clamp(2rem,4.2vw,3.4rem);color:var(--slate-deep);line-height:1.08;}
.section-sub{font-family:'Shippori Mincho',serif;color:var(--forest-dark);font-size:1.05rem;letter-spacing:.08em;}

/* ---------- Editorial Cards ---------- */
.card-trail{position:relative;overflow:hidden;border-radius:4px;background:var(--slate-deep);}
.card-trail img{transition:transform 1s var(--ease),filter .8s;height:100%;width:100%;object-fit:cover;}
.card-trail:hover img{transform:scale(1.09);filter:brightness(.85);}
.card-trail .card-scrim{position:absolute;inset:0;background:linear-gradient(180deg, rgba(0,0,0,0) 30%, rgba(10,12,10,.88) 100%);}
.card-trail .card-body{position:absolute;left:0;right:0;bottom:0;padding:26px;color:#fff;}
.card-trail .card-tag{display:inline-block;padding:4px 12px;font-size:.65rem;letter-spacing:.18em;text-transform:uppercase;border:1px solid rgba(255,255,255,.5);border-radius:20px;margin-bottom:12px;}
.card-trail .card-arrow{transition:transform .4s var(--ease);}
.card-trail:hover .card-arrow{transform:translateX(8px);}

.info-card{background:#fff;border:1px solid rgba(43,49,56,.08);transition:transform .5s var(--ease), box-shadow .5s var(--ease);}
.info-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-soft);}

/* ---------- Divider / texture ---------- */
.slate-divider{height:1px;background:linear-gradient(90deg, transparent, var(--slate) 50%, transparent);opacity:.35;}
.texture-noise{position:absolute;inset:0;opacity:.05;mix-blend-mode:overlay;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");}

/* ---------- Masonry Gallery ---------- */
.masonry{column-count:1;column-gap:14px;}
@media(min-width:640px){.masonry{column-count:2;}}
@media(min-width:1024px){.masonry{column-count:3;}}
.masonry figure{break-inside:avoid;margin:0 0 14px;position:relative;overflow:hidden;border-radius:3px;cursor:zoom-in;}
.masonry figure img{width:100%;display:block;transition:transform .8s var(--ease),filter .6s;}
.masonry figure:hover img{transform:scale(1.06);filter:brightness(.82);}
.masonry figure figcaption{position:absolute;left:0;right:0;bottom:0;padding:16px;color:#fff;font-size:.78rem;letter-spacing:.06em;opacity:0;transform:translateY(10px);transition:opacity .4s,transform .4s;background:linear-gradient(180deg,transparent,rgba(0,0,0,.72));}
.masonry figure:hover figcaption{opacity:1;transform:translateY(0);}

/* Lightbox */
#lightbox{position:fixed;inset:0;z-index:200;background:rgba(15,17,15,.94);display:none;align-items:center;justify-content:center;padding:4vh 3vw;}
#lightbox.open{display:flex;}
#lightbox img{max-height:88vh;max-width:92vw;border:1px solid rgba(255,255,255,.15);opacity:0;transform:scale(.97);transition:opacity .35s,transform .35s;}
#lightbox img.show{opacity:1;transform:scale(1);}
#lightbox .lb-caption{position:absolute;bottom:5vh;left:0;right:0;text-align:center;color:#f1ece0;font-family:'Shippori Mincho',serif;letter-spacing:.08em;}
.lb-btn{position:absolute;color:#fff;opacity:.75;transition:opacity .3s,transform .3s;cursor:pointer;}
.lb-btn:hover{opacity:1;}
#lb-close{top:4vh;right:4vw;font-size:1.6rem;}
#lb-prev{left:2vw;top:50%;transform:translateY(-50%);font-size:2rem;}
#lb-next{right:2vw;top:50%;transform:translateY(-50%);font-size:2rem;}

/* ---------- Accordion (FAQ) ---------- */
.accordion-item{border-bottom:1px solid rgba(43,49,56,.14);}
.accordion-q{display:flex;align-items:center;justify-content:space-between;padding:26px 4px;cursor:pointer;}
.accordion-q h3{font-family:'Fraunces',serif;font-size:1.15rem;color:var(--slate-deep);}
.accordion-icon{width:22px;height:22px;position:relative;flex-shrink:0;margin-left:20px;}
.accordion-icon::before,.accordion-icon::after{content:'';position:absolute;background:var(--forest);top:50%;left:50%;transform:translate(-50%,-50%);}
.accordion-icon::before{width:100%;height:1px;}
.accordion-icon::after{width:1px;height:100%;transition:transform .35s var(--ease);}
.accordion-item.open .accordion-icon::after{transform:translate(-50%,-50%) rotate(90deg) scale(0);}
.accordion-a{max-height:0;overflow:hidden;transition:max-height .5s var(--ease);}
.accordion-a p{padding:0 4px 26px;color:var(--slate);line-height:1.85;max-width:64ch;}

/* ---------- Forms ---------- */
.field{width:100%;background:transparent;border:none;border-bottom:1px solid rgba(43,49,56,.28);padding:14px 4px;font-family:'Jost',sans-serif;font-size:.95rem;color:var(--ink);transition:border-color .3s;}
.field:focus{outline:none;border-color:var(--forest);}
.field::placeholder{color:rgba(43,49,56,.45);}
label.field-label{font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;color:var(--slate);margin-bottom:6px;display:block;}

/* ---------- Toast ---------- */
#toast-wrap{position:fixed;top:24px;right:24px;z-index:300;display:flex;flex-direction:column;gap:10px;width:min(340px,88vw);}
.toast{
  background:var(--slate-deep);color:#f6f2e8;padding:16px 20px;border-radius:3px;
  box-shadow:0 20px 40px -12px rgba(0,0,0,.4);
  display:flex;align-items:flex-start;gap:12px;
  transform:translateX(120%);opacity:0;transition:transform .5s var(--ease),opacity .5s;
  border-left:3px solid var(--gold);
}
.toast.show{transform:translateX(0);opacity:1;}
.toast .t-title{font-family:'Fraunces',serif;font-size:.95rem;margin-bottom:2px;}
.toast .t-msg{font-size:.8rem;color:rgba(246,242,232,.75);line-height:1.5;}
.toast .t-close{margin-left:auto;cursor:pointer;opacity:.6;}
.toast .t-close:hover{opacity:1;}

/* ---------- Back to top ---------- */
#back-top{position:fixed;bottom:24px;right:24px;z-index:60;width:46px;height:46px;border-radius:50%;background:var(--slate-deep);color:#fff;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .4s,transform .4s;transform:translateY(10px);}
#back-top.show{opacity:.85;pointer-events:auto;transform:translateY(0);}
#back-top:hover{opacity:1;transform:translateY(-4px);}

/* ---------- Footer ---------- */
.site-footer{background:var(--slate-deep);color:var(--mist-soft);position:relative;overflow:hidden;}
.site-footer a:hover{color:var(--gold);}
.footer-links li{margin-bottom:10px;}

/* ---------- Misc ---------- */
.vert-line{width:1px;background:linear-gradient(180deg,transparent,var(--gold),transparent);}
.num-tag{font-family:'Fraunces',serif;font-size:.85rem;color:var(--gold);}
.clip-ridge{clip-path:polygon(0 18%,12% 8%,26% 22%,40% 4%,55% 16%,70% 2%,86% 14%,100% 0,100% 100%,0 100%);}
::selection{background:var(--forest);color:#fff;}

/* Scrollbar */
::-webkit-scrollbar{width:9px;}
::-webkit-scrollbar-track{background:var(--paper);}
::-webkit-scrollbar-thumb{background:var(--slate);border-radius:6px;}

@media(max-width:768px){
  .hero-inner{padding-bottom:12vh;}
}