/* ==========================================================================
   SIANALABS TECHNOLOGIES — V2
   Clean corporate-innovation aesthetic: white/near-black + indigo accent
   ========================================================================== */

:root{
  --white:        #FFFFFF;
  --bg:           #F7F8FB;
  --ink:          #12131A;
  --ink-soft:     #5B5F6B;
  --line:         #E6E8EE;
  --indigo:       #3B4CFF;
  --indigo-dark:  #2C3AE0;
  --navy:         #05060F;
  --navy-card:    #10121F;
  --navy-line:    rgba(255,255,255,0.09);
  --navy-text:    #B7BAC8;

  --f-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --container: 1360px;
  --pad: clamp(20px, 5vw, 72px);
  --ease: cubic-bezier(.2,.7,.2,1);
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img, svg{ display:block; max-width:100%; }
a{ color: inherit; text-decoration: none; }
h1,h2,h3,p{ margin:0; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family: inherit; cursor:pointer; }

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.skip-link{
  position:absolute; left:-9999px; top:0;
  background:var(--ink); color:#fff; padding:12px 18px;
  z-index:999; font-size:13px;
}
.skip-link:focus{ left: var(--pad); top: 12px; }

:focus-visible{ outline: 2px solid var(--indigo); outline-offset: 3px; }

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size: 14.5px;
  font-weight: 600;
  white-space: nowrap;
  border: none;
  background:none;
}
.btn svg{ width:15px; height:15px; transition: transform .3s var(--ease); }
.btn:hover svg{ transform: translate(2px,-2px); }

.btn-dark{
  background: var(--ink);
  color: #fff;
  padding: 13px 22px;
  border-radius: 999px;
  transition: background .25s var(--ease), transform .25s var(--ease);
}
.btn-dark:hover{ background: var(--indigo); transform: translateY(-1px); }

.btn-header{ padding: 11px 20px; font-size: 14px; }

.btn-lg{ padding: 16px 26px; font-size: 15px; }

.btn-play{
  align-items:center;
  color: var(--ink);
  font-weight: 600;
  font-size: 15px;
}
.play-circle{
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1.4px solid var(--ink);
  display:flex; align-items:center; justify-content:center;
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
}
.play-circle svg{ width:12px; height:12px; margin-left: 1px; }
.btn-play:hover .play-circle{ background: var(--indigo); border-color: var(--indigo); color:#fff; }

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247,248,251,0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content: space-between;
  height: 84px;
  gap: 24px;
}

.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{ width:38px; height:42px; flex:0 0 auto; display:flex; align-items:center; justify-content:center; }
.brand-mark img{ width:100%; height:100%; object-fit:contain; display:block; }
.brand-word{ display:flex; flex-direction:column; line-height:1.05; }
.brand-name{ font-size:19px; font-weight:700; letter-spacing:-0.01em; color:var(--ink); }
.brand-sub{ font-size:11.5px; font-weight:500; color:var(--ink-soft); letter-spacing:0.01em; }

.primary-nav{
  display:flex;
  gap: 30px;
  flex: 1;
  justify-content: center;
}
.primary-nav a{
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 6px;
  transition: color .25s var(--ease);
}
.primary-nav a::after{
  content:"";
  position:absolute;
  left:0; right:100%;
  bottom:0;
  height:2px;
  background: var(--ink);
  transition: right .3s var(--ease);
}
.primary-nav a:hover{ color: var(--ink); }
.primary-nav a:hover::after{ right:0; }
.primary-nav a.active{ color: var(--ink); }
.primary-nav a.active::after{ right:0; }

.nav-toggle{
  display:none;
  width:38px; height:38px;
  border:none; background:none;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
}
.nav-toggle span{
  width:22px; height:1.6px; background: var(--ink);
  transition: transform .3s var(--ease), opacity .3s var(--ease);
}
.nav-toggle.open span:nth-child(1){ transform: translateY(6.6px) rotate(45deg); }
.nav-toggle.open span:nth-child(2){ opacity:0; }
.nav-toggle.open span:nth-child(3){ transform: translateY(-6.6px) rotate(-45deg); }

.mobile-nav{
  display:none;
  flex-direction: column;
  border-top: 1px solid var(--line);
  background: var(--bg);
  padding: 8px var(--pad) 20px;
}
.mobile-nav.open{ display:flex; }
.mobile-nav a{
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.mobile-nav .btn{ margin-top:18px; justify-content:center; }

/* ==========================================================================
   HERO
   ========================================================================== */
.hero{ overflow:hidden; }
.hero-grid{
  display:grid;
  grid-template-columns: 0.86fr 1.14fr;
  align-items: stretch;
  min-height: 560px;
  gap: 0;
  width: 100%;
}

.hero-copy{
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding-top: 46px;
  padding-bottom: 46px;
  padding-right: clamp(20px, 4vw, 56px);
  padding-left: max(var(--pad), calc((100vw - var(--container)) / 2 + var(--pad)));
}

.eyebrow{
  display:flex;
  align-items:center;
  gap:10px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 22px;
}
.eyebrow-dash{ width:22px; height:2px; background: var(--indigo); display:inline-block; }
.eyebrow-dark{ color: var(--navy-text); }

.hero-title{
  font-size: clamp(38px, 4.6vw, 56px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--ink);
}
.accent-text{ color: var(--indigo); }

.hero-desc{
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--ink-soft);
  max-width: 40ch;
  margin-top: 24px;
}

.hero-actions{
  display:flex;
  align-items:center;
  gap: 28px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.hero-visual{
  position: relative;
  overflow:hidden;
}
.trails-svg{
  width:100%; height:100%;
  min-height: 380px;
  display:block;
}
.hero-visual-fade{
  display:none;
}

.trails-svg{ animation: heroFadeIn 1.1s var(--ease) both; }
@keyframes heroFadeIn{ from{ opacity:0; transform: scale(1.02); } to{ opacity:1; transform: scale(1); } }

/* ==========================================================================
   SOLUTIONS
   ========================================================================== */
.solutions-section{
  position: relative;
  background: var(--navy);
  color: #fff;
  padding: clamp(64px, 9vw, 120px) 0;
  overflow: hidden;
}
.wave-graphic{
  position:absolute;
  left:0; bottom:0;
  width: 46%;
  max-width: 620px;
  height:auto;
  pointer-events:none;
}

.solutions-grid{
  position: relative;
  z-index: 1;
  display:grid;
  grid-template-columns: 0.85fr 1.7fr;
  gap: clamp(32px, 5vw, 56px);
  align-items:start;
}

.solutions-intro{ padding-top: 8px; }
.solutions-title{
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.18;
  margin-top: 18px;
  max-width: 13ch;
}

.solutions-cards{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.solution-card{
  background: var(--navy-card);
  border: 1px solid var(--navy-line);
  border-radius: 14px;
  padding: 28px 24px 26px;
  display:flex;
  flex-direction:column;
  gap: 16px;
  transition: border-color .3s var(--ease), transform .3s var(--ease), background .3s var(--ease);
}
.solution-card:hover{
  border-color: rgba(59,76,255,0.55);
  transform: translateY(-4px);
  background: #12152A;
}

.solution-icon{
  width: 46px; height: 46px;
  border-radius: 10px;
  border: 1px solid var(--navy-line);
  display:flex; align-items:center; justify-content:center;
  color: var(--indigo);
}
.solution-icon svg{ width:24px; height:24px; }

.solution-card h3{
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.005em;
}
.solution-card p{
  font-size: 14px;
  line-height: 1.65;
  color: var(--navy-text);
  flex: 1;
}

.card-link{
  width: 34px; height: 34px;
  border-radius: 50%;
  border: 1px solid var(--navy-line);
  display:flex; align-items:center; justify-content:center;
  color: var(--indigo);
  transition: background .25s var(--ease), color .25s var(--ease), transform .25s var(--ease), border-color .25s var(--ease);
}
.card-link svg{ width:14px; height:14px; }
.card-link:hover{ background: var(--indigo); color:#fff; border-color: var(--indigo); transform: translate(2px,-2px); }

/* ==========================================================================
   RESPONSIVE — TABLET
   ========================================================================== */
@media (max-width: 1100px){
  .primary-nav{ display:none; }
  .btn-header{ display:none; }
  .nav-toggle{ display:flex; }

  .hero-grid{ grid-template-columns: 1fr; min-height: auto; }
  .hero-copy{ padding-right: 0; padding-top: 48px; }
  .hero-visual{ order: -1; height: 340px; }
  .hero-visual-fade{ display:none; }

  .solutions-grid{ grid-template-columns: 1fr; }
  .solutions-title{ max-width: none; }
  .solutions-cards{ grid-template-columns: repeat(2, 1fr); }
  .wave-graphic{ width: 70%; opacity:0.6; }
}

/* ==========================================================================
   RESPONSIVE — MOBILE
   ========================================================================== */
@media (max-width: 640px){
  .header-inner{ height: 68px; }
  .brand-name{ font-size:16px; }
  .brand-sub{ font-size:10px; }

  .hero-title{ font-size: clamp(32px, 9vw, 42px); }
  .hero-actions{ flex-direction: column; align-items: flex-start; gap: 18px; }

  .solutions-cards{ grid-template-columns: 1fr; }
  .wave-graphic{ width: 100%; opacity:0.4; }
}

/* ==========================================================================
   REDUCED MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
  .trails-svg{ opacity:1; transform:none; }
}