/* ==========================================================================
   NusSolar — A Nusfun Clean Energy Platform
   Shared stylesheet
   ========================================================================== */

:root{
  --color-navy: #0E3A53;
  --color-navy-deep: #0A2A3E;
  --color-green: #1F8A5F;
  --color-green-light: #E4F3EC;
  --color-sky: #EAF4F8;
  --color-sun: #F5A623;
  --color-white: #FFFFFF;
  --color-ink: #152531;
  --color-slate: #55707D;
  --color-line: #DCE7EC;

  --font-display: 'Manrope', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;

  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-soft: 0 12px 30px rgba(14, 58, 83, 0.08);
  --shadow-card: 0 8px 24px rgba(14, 58, 83, 0.10);
  --max-width: 1180px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4{
  font-family: var(--font-display);
  color: var(--color-navy);
  line-height: 1.2;
  margin: 0 0 0.5em;
}

h1{ font-size: clamp(2.1rem, 4vw, 3.1rem); font-weight: 800; }
h2{ font-size: clamp(1.5rem, 2.6vw, 2.1rem); font-weight: 800; }
h3{ font-size: 1.25rem; font-weight: 700; }

p{ margin: 0 0 1em; color: var(--color-slate); }

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

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

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

.eyebrow{
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--color-green);
  background: var(--color-green-light);
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
}

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.btn:hover{ transform: translateY(-2px); }
.btn-primary{
  background: var(--color-navy);
  color: var(--color-white);
  box-shadow: 0 10px 24px rgba(14,58,83,0.25);
}
.btn-primary:hover{ background: var(--color-navy-deep); }
.btn-secondary{
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-navy);
}
.btn-secondary:hover{ background: var(--color-navy); color: var(--color-white); }
.btn-ghost{
  background: var(--color-white);
  color: var(--color-navy);
  border-color: var(--color-line);
}
.btn-ghost:hover{ border-color: var(--color-navy); }
.btn-sun{
  background: var(--color-sun);
  color: var(--color-navy-deep);
}
.btn-sun:hover{ filter: brightness(1.05); }

/* ---------- Utility bar ---------- */
.utility-bar{
  background: var(--color-navy-deep);
  color: #CFE3EC;
  font-size: 0.82rem;
}
.utility-bar .container{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 8px;
  padding-bottom: 8px;
  gap: 12px;
  flex-wrap: wrap;
}
.utility-bar a{ display:flex; align-items:center; gap:8px; opacity:0.95; }
.utility-bar a:hover{ opacity: 1; }
.utility-bar .powered-logo{ filter: brightness(0) invert(1); opacity: 0.92; height: 18px; width: auto; }
.utility-tagline{ letter-spacing: 0.02em; }

/* ---------- Header / nav ---------- */
header.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
}
.nav-row{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}
.brand{
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
}
.brand-mark{ font-size: 1.5rem; font-weight: 800; color: var(--color-navy); }
.brand-mark span{ color: var(--color-green); }
.brand-sub{ font-size: 0.72rem; color: var(--color-slate); letter-spacing: 0.03em; }

nav.main-nav{ display: flex; align-items: center; gap: 28px; }
nav.main-nav a{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-navy);
  position: relative;
  padding: 6px 0;
}
nav.main-nav a.active,
nav.main-nav a:hover{ color: var(--color-green); }
nav.main-nav a.active::after{
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--color-green);
  border-radius: 2px;
}

.nav-actions{ display: flex; align-items: center; gap: 14px; }

.menu-toggle{
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.menu-toggle span{
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-navy);
  margin: 5px 0;
  transition: 0.2s;
}

/* ---------- Hero ---------- */
.hero{
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--color-sky) 0%, var(--color-white) 100%);
}
.hero .container{
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  padding-top: 64px;
  padding-bottom: 64px;
}
.hero-copy p.lead{ font-size: 1.08rem; color: var(--color-slate); max-width: 46ch; }
.hero-actions{ display: flex; flex-wrap: wrap; gap: 14px; margin-top: 28px; }
.hero-media{
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
  aspect-ratio: 16/9;
}
.hero-media img{ width: 100%; height: 100%; object-fit: cover; }

.page-hero{
  background: linear-gradient(180deg, var(--color-sky) 0%, var(--color-white) 100%);
  padding: 56px 0 44px;
}
.page-hero .container{ max-width: 860px; text-align: left; }
.page-hero .eyebrow{ margin-bottom: 16px; }

/* ---------- Sections ---------- */
section{ padding: 72px 0; }
section.alt{ background: var(--color-sky); }
.section-head{ max-width: 640px; margin-bottom: 40px; }
.section-head.center{ margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Product cards ---------- */
.card-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.card{
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  height: 100%;
}
.card .eyebrow{ align-self: flex-start; }
.card h3{ margin-bottom: 4px; }
.card .card-sub{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.86rem;
  color: var(--color-green);
  margin-bottom: 12px;
}
.card p{ flex-grow: 1; }
.card .card-link{
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-navy);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
}
.card .card-link:hover{ color: var(--color-green); }

/* ---------- Media + text split ---------- */
.split{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.split.reverse .split-media{ order: 2; }
.split-media img{
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  aspect-ratio: 16/9;
  object-fit: cover;
  width: 100%;
}
.check-list{ list-style: none; padding: 0; margin: 20px 0; }
.check-list li{
  position: relative;
  padding-left: 28px;
  margin-bottom: 10px;
  color: var(--color-ink);
}
.check-list li::before{
  content: "";
  position: absolute;
  left: 0; top: 6px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--color-green-light);
  border: 2px solid var(--color-green);
}

/* ---------- Compliance / note callouts ---------- */
.note-box{
  background: var(--color-sky);
  border-left: 4px solid var(--color-navy);
  border-radius: 8px;
  padding: 18px 22px;
  font-size: 0.92rem;
  color: var(--color-slate);
  margin: 28px 0;
}
.note-box strong{ color: var(--color-navy); }

/* ---------- Applications / tag list ---------- */
.tag-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}
.tag-item{
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--color-navy);
  display: flex;
  align-items: center;
  gap: 10px;
}
.tag-item::before{
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--color-sun);
  flex-shrink: 0;
}

/* ---------- Partner types ---------- */
.partner-grid{
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
}
.partner-chip{
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 18px;
  font-weight: 600;
  font-family: var(--font-display);
  color: var(--color-navy);
  font-size: 0.95rem;
}

/* ---------- Downloads ---------- */
.download-card{
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-card);
}
.download-status{
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-slate);
  background: var(--color-sky);
  padding: 4px 12px;
  border-radius: 999px;
  width: fit-content;
}

/* ---------- CTA band ---------- */
.cta-band{
  background: var(--color-navy);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-band h2{ color: var(--color-white); margin-bottom: 6px; }
.cta-band p{ color: #CFE3EC; margin: 0; }
.cta-band .btn-primary{ background: var(--color-sun); color: var(--color-navy-deep); box-shadow: none; }
.cta-band .btn-primary:hover{ filter: brightness(1.05); }

/* ---------- Forms ---------- */
form.contact-form{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
form.contact-form .full{ grid-column: 1 / -1; }
.field label{
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--color-navy);
  margin-bottom: 6px;
}
.field input,
.field select,
.field textarea{
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-line);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-ink);
  background: var(--color-white);
}
.field input:focus,
.field select:focus,
.field textarea:focus{
  outline: 2px solid var(--color-green);
  outline-offset: 1px;
}
.contact-info-card{
  background: var(--color-sky);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-info-card h3{ margin-bottom: 16px; }
.contact-info-card .info-line{ display:flex; gap:10px; margin-bottom: 12px; color: var(--color-ink); }

/* ---------- Footer ---------- */
footer.site-footer{
  background: var(--color-navy-deep);
  color: #B9D2DE;
  padding: 56px 0 26px;
}
.footer-grid{
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.footer-grid h4{ color: var(--color-white); font-size: 0.95rem; margin-bottom: 16px; }
.footer-brand .brand-mark{ color: var(--color-white); }
.footer-brand .brand-mark span{ color: var(--color-sun); }
.footer-brand p{ color: #9FBACB; max-width: 32ch; margin-top: 12px; }
.footer-links{ list-style: none; padding: 0; margin: 0; }
.footer-links li{ margin-bottom: 10px; }
.footer-links a{ color: #B9D2DE; }
.footer-links a:hover{ color: var(--color-white); }
.footer-bottom{
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 24px;
  font-size: 0.82rem;
  color: #82A0B0;
}
.footer-bottom .powered-logo{ filter: brightness(0) invert(1); opacity: 0.9; height: 18px; width: auto; }
.footer-legal{
  max-width: 900px;
  font-size: 0.8rem;
  color: #82A0B0;
  margin-top: 18px;
  line-height: 1.6;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px){
  .hero .container{ grid-template-columns: 1fr; padding-top: 40px; padding-bottom: 40px; }
  .hero-media{ order: -1; }
  .split{ grid-template-columns: 1fr; gap: 28px; }
  .split.reverse .split-media{ order: 0; }
  .footer-grid{ grid-template-columns: 1fr 1fr; }
  form.contact-form{ grid-template-columns: 1fr; }
}

@media (max-width: 720px){
  nav.main-nav{
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-line);
    box-shadow: var(--shadow-soft);
    transform: translateY(-130%);
    transition: transform 0.25s ease;
  }
  nav.main-nav.open{ transform: translateY(0); }
  .menu-toggle{ display: block; }
  .nav-actions .btn-secondary{ display: none; }
  .footer-grid{ grid-template-columns: 1fr; }
  .utility-bar .utility-tagline{ display: none; }
}