/* =========================================================
   Olive Web Agency — Design System
   Apple-style structure & motion, olive-green palette.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root{
  /* Palette */
  --paper:      #FBFBF9; /* primary background, warm off-white */
  --tint:       #F2F1EA; /* alternating section background */
  --tint-deep:  #EAE8DC; /* card / hover surface */
  --ink:        #1D1D1F; /* primary text, Apple's near-black */
  --gray:       #6E6E73; /* secondary text */
  --line:       #DEDDD3; /* hairline dividers */

  --olive-900:  #2E3A1C;
  --olive-700:  #4A5D29; /* brand primary */
  --olive-600:  #5F7A34; /* interactive */
  --olive-500:  #77914A;
  --olive-400:  #8FA35E; /* light accent */
  --olive-100:  #E7EBD9; /* soft tint */

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 10px;

  --maxw: 1120px;

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

*{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body{
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}

img{ max-width: 100%; display: block; }

a{ color: inherit; text-decoration: none; }

:focus-visible{
  outline: 2px solid var(--olive-600);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Typography ---------- */

h1, h2, h3{
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0;
}

.eyebrow{
  font-size: 14px;
  font-weight: 600;
  color: var(--olive-600);
  letter-spacing: 0.02em;
  margin: 0 0 12px;
}

.section-title{
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.08;
}

.section-lede{
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--gray);
  max-width: 620px;
  margin: 16px 0 0;
  font-weight: 400;
  letter-spacing: 0;
}

p{ margin: 0; }

/* ---------- Nav ---------- */

.nav{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(251,251,249,0.78);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease);
}
.nav.scrolled{ border-bottom-color: var(--line); }

.nav-inner{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand{ display: flex; align-items: center; gap: 10px; }
.brand img{ height: 26px; width: auto; }
.brand-word{
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.brand-word em{ color: var(--olive-700); font-style: normal; }

.nav-links{
  display: flex;
  gap: 30px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a{
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  opacity: 0.82;
  transition: opacity .2s;
}
.nav-links a:hover{ opacity: 1; }
.nav-links a.active{ color: var(--olive-700); opacity: 1; }

.nav-cta{
  font-size: 13px;
  font-weight: 600;
  background: var(--olive-700);
  color: #fff;
  padding: 9px 18px;
  border-radius: 999px;
  transition: background .2s;
  white-space: nowrap;
}
.nav-cta:hover{ background: var(--olive-900); }

.nav-actions{
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ---------- Language toggle ---------- */

.lang-switch{
  position: relative;
  display: inline-flex;
  align-items: center;
  background: var(--tint-deep);
  border-radius: 999px;
  padding: 3px;
  height: 30px;
  flex-shrink: 0;
}
.lang-switch input[type="radio"]{
  position: absolute;
  opacity: 0;
  width: 1px; height: 1px;
  pointer-events: none;
}
.lang-switch label{
  position: relative;
  z-index: 1;
  width: 34px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--gray);
  cursor: pointer;
  border-radius: 999px;
  transition: color .2s var(--ease);
  user-select: none;
}
.lang-switch input:checked + label{ color: #fff; }
.lang-thumb{
  position: absolute;
  top: 3px; left: 3px;
  width: 34px;
  height: 24px;
  background: var(--olive-700);
  border-radius: 999px;
  transition: transform .25s var(--ease);
  z-index: 0;
}
.lang-switch input#lang-ja:checked ~ .lang-thumb{
  transform: translateX(34px);
}
.lang-switch input:focus-visible + label{
  outline: 2px solid var(--olive-600);
  outline-offset: 2px;
}

.nav-toggle{
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span{
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
  transition: transform .25s, opacity .25s;
}

/* ---------- Buttons ---------- */

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  padding: 13px 26px;
  border-radius: 999px;
  transition: transform .2s var(--ease), background .2s, box-shadow .2s;
  cursor: pointer;
  border: none;
}
.btn-primary{ background: var(--olive-700); color: #fff; }
.btn-primary:hover{ background: var(--olive-900); transform: translateY(-1px); }
.btn-ghost{ background: transparent; color: var(--olive-700); border: 1px solid var(--line); }
.btn-ghost:hover{ border-color: var(--olive-600); background: var(--olive-100); }
.btn-row{ display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Hero ---------- */

.hero{
  padding: 108px 0 64px;
  text-align: center;
}
.hero h1{
  font-size: clamp(40px, 7vw, 80px);
  line-height: 1.03;
  max-width: 900px;
  margin: 0 auto;
}
.hero h1 .accent{ color: var(--olive-700); }
.hero-sub{
  font-size: clamp(18px, 2vw, 22px);
  color: var(--gray);
  max-width: 620px;
  margin: 22px auto 0;
  font-weight: 400;
}
.hero .btn-row{ justify-content: center; margin-top: 34px; }

/* Hero visual: abstract "browser build" mockup */
.hero-visual{
  margin: 72px auto 0;
  max-width: 980px;
  position: relative;
}
.mock-window{
  background: linear-gradient(180deg, #fff, var(--tint));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 40px 90px -30px rgba(46,58,28,0.28);
  overflow: hidden;
  transform: translateY(0);
  animation: rise .9s var(--ease) both;
}
@keyframes rise{
  from{ opacity: 0; transform: translateY(28px) scale(.98); }
  to{ opacity: 1; transform: translateY(0) scale(1); }
}
.mock-bar{
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.mock-dot{ width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.mock-bar .mock-dot:nth-child(1){ background: var(--olive-400); }
.mock-bar .mock-dot:nth-child(2){ background: var(--olive-500); }
.mock-bar .mock-dot:nth-child(3){ background: var(--olive-700); }
.mock-url{
  margin-left: 12px;
  font-size: 12px;
  color: var(--gray);
  background: var(--tint);
  border-radius: 6px;
  padding: 5px 14px;
  flex: 1;
  max-width: 280px;
}
.mock-body{
  padding: 40px 44px 52px;
  display: grid;
  gap: 16px;
}
.mock-line{ height: 14px; border-radius: 7px; background: var(--tint-deep); }
.mock-line.w-60{ width: 60%; }
.mock-line.w-40{ width: 40%; }
.mock-line.w-90{ width: 90%; }
.mock-blocks{
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 16px;
  margin-top: 10px;
}
.mock-block{
  height: 92px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--olive-100), var(--tint-deep));
  border: 1px solid var(--line);
}

/* ---------- Logos / trust strip ---------- */

.trust{
  padding: 40px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.trust-inner{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 46px;
  flex-wrap: wrap;
  text-align: center;
}
.trust-item{
  font-size: 14px;
  font-weight: 600;
  color: var(--gray);
  letter-spacing: 0.01em;
}
.trust-label{
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray);
  margin-right: 6px;
}

/* ---------- Generic section ---------- */

.section{ padding: 96px 0; }
.section.tint{ background: var(--tint); }
.section-head{ margin-bottom: 52px; }
.section-head.center{ text-align: center; }
.section-head.center .section-lede{ margin-left: auto; margin-right: auto; }

/* ---------- Stats ---------- */

.stats{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 20px;
}
.stat{
  text-align: center;
  padding: 28px 12px;
}
.stat .num{
  font-size: clamp(34px, 4vw, 48px);
  font-weight: 800;
  color: var(--olive-700);
  letter-spacing: -0.02em;
}
.stat .label{
  font-size: 14px;
  color: var(--gray);
  margin-top: 6px;
}

/* ---------- Services grid ---------- */

.service-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.service-card{
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}
.service-card:hover{
  transform: translateY(-4px);
  box-shadow: 0 24px 48px -28px rgba(46,58,28,0.35);
  border-color: var(--olive-400);
}
.service-icon{
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--olive-100);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
  color: var(--olive-700);
}
.service-card h3{
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}
.service-card p{
  font-size: 15px;
  color: var(--gray);
  line-height: 1.55;
}

/* ---------- Skills ---------- */

.skills-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 20px;
}
.skill-chip{
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}
.skill-chip .dot{
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--olive-500);
  flex-shrink: 0;
}
.skill-group-title{
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--olive-700);
  font-weight: 700;
  margin: 36px 0 14px;
}
.skill-group-title:first-child{ margin-top: 0; }

/* ---------- Timeline (track record) ---------- */

.timeline{
  border-left: 2px solid var(--line);
  margin-left: 6px;
  padding-left: 34px;
  display: grid;
  gap: 40px;
}
.timeline-item{ position: relative; }
.timeline-item::before{
  content: '';
  position: absolute;
  left: -41px;
  top: 4px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--olive-600);
  border: 3px solid var(--paper);
  box-shadow: 0 0 0 2px var(--line);
}
.timeline-item .when{
  font-size: 13px;
  font-weight: 600;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.timeline-item h3{
  font-size: 19px;
  margin: 6px 0 6px;
}
.timeline-item h3 span{ color: var(--olive-700); }
.timeline-item p{
  font-size: 15px;
  color: var(--gray);
  max-width: 620px;
}

/* ---------- Portfolio grid & cards ---------- */

.filter-row{
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 40px;
}
.filter-btn{
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray);
  cursor: pointer;
  transition: all .2s;
}
.filter-btn:hover{ border-color: var(--olive-400); color: var(--ink); }
.filter-btn.active{
  background: var(--olive-700);
  border-color: var(--olive-700);
  color: #fff;
}

.portfolio-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.portfolio-card{
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--paper);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
  display: flex;
  flex-direction: column;
}
.portfolio-card:hover{
  transform: translateY(-5px);
  box-shadow: 0 30px 60px -30px rgba(46,58,28,0.35);
}
.portfolio-thumb{
  aspect-ratio: 16/10.5;
  background: linear-gradient(135deg, var(--olive-100), var(--tint-deep));
  position: relative;
  overflow: hidden;
}
.portfolio-thumb img{
  width: 100%; height: 100%; object-fit: cover;
}
.portfolio-thumb .placeholder-mark{
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  opacity: 0.35;
}
.portfolio-body{ padding: 22px 22px 26px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.portfolio-tag{
  font-size: 12px;
  font-weight: 700;
  color: var(--olive-700);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.portfolio-card h3{ font-size: 18px; }
.portfolio-card p{ font-size: 14px; color: var(--gray); flex: 1; }
.portfolio-link{
  font-size: 14px;
  font-weight: 600;
  color: var(--olive-700);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
}
.portfolio-link .arrow{ transition: transform .2s; }
.portfolio-card:hover .portfolio-link .arrow{ transform: translateX(3px); }

.portfolio-empty{
  text-align: center;
  padding: 80px 20px;
  color: var(--gray);
  border: 1px dashed var(--line);
  border-radius: var(--radius-md);
}

/* ---------- CTA band ---------- */

.cta-band{
  background: var(--olive-900);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 64px 40px;
  text-align: center;
  margin: 0 24px;
}
.cta-band h2{ color: #fff; font-size: clamp(28px, 3.6vw, 40px); }
.cta-band p{ color: rgba(255,255,255,0.72); max-width: 520px; margin: 14px auto 30px; font-size: 16px; }
.cta-band .btn-primary{ background: #fff; color: var(--olive-900); }
.cta-band .btn-primary:hover{ background: var(--olive-100); }
.cta-band .btn-ghost{ border-color: rgba(255,255,255,0.3); color: #fff; }
.cta-band .btn-ghost:hover{ background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.5); }

/* ---------- Footer ---------- */

.footer{
  border-top: 1px solid var(--line);
  padding: 52px 0 34px;
}
.footer-top{
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  flex-wrap: wrap;
  padding-bottom: 32px;
}
.footer-brand p{
  color: var(--gray);
  font-size: 14px;
  max-width: 280px;
  margin-top: 10px;
}
.footer-cols{
  display: flex;
  gap: 60px;
  flex-wrap: wrap;
}
.footer-col h4{
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray);
  margin: 0 0 14px;
}
.footer-col ul{ list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-col a{ font-size: 14px; color: var(--ink); }
.footer-col a:hover{ color: var(--olive-700); }
.footer-bottom{
  border-top: 1px solid var(--line);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 13px;
  color: var(--gray);
}

/* ---------- Reveal on scroll ---------- */

.reveal{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.in{ opacity: 1; transform: translateY(0); }

/* ---------- Page hero (portfolio page) ---------- */

.page-hero{
  padding: 80px 0 20px;
  text-align: center;
}
.page-hero h1{ font-size: clamp(34px, 5vw, 58px); }
.page-hero .section-lede{ margin: 18px auto 0; }

/* ---------- Responsive ---------- */

@media (max-width: 880px){
  .service-grid{ grid-template-columns: repeat(2,1fr); }
  .skills-grid{ grid-template-columns: repeat(2,1fr); }
  .portfolio-grid{ grid-template-columns: repeat(2,1fr); }
  .stats{ grid-template-columns: repeat(2,1fr); }
  .mock-blocks{ grid-template-columns: repeat(3,1fr); }
}

@media (max-width: 680px){
  .nav-links{
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--paper);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--line);
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s var(--ease);
  }
  .nav-links.open{ max-height: 320px; }
  .nav-links li{ width: 100%; }
  .nav-links a{
    display: block;
    padding: 16px 24px;
    border-top: 1px solid var(--line);
    opacity: 1;
  }
  .nav-cta{ display: none; }
  .nav-toggle{ display: block; }
  .nav-actions{ gap: 10px; }

  .service-grid{ grid-template-columns: 1fr; }
  .skills-grid{ grid-template-columns: 1fr 1fr; }
  .portfolio-grid{ grid-template-columns: 1fr; }
  .stats{ grid-template-columns: 1fr 1fr; }
  .footer-top{ flex-direction: column; }
  .mock-body{ padding: 26px 20px 34px; }
  .mock-blocks{ grid-template-columns: 1fr; }
  .cta-band{ margin: 0 16px; padding: 48px 24px; }
}