:root {
  --color-primary: #0f4c5c;
  --color-primary-dark: #0a3540;
  --color-secondary: #1b7f8e;
  --color-accent: #e09f3e;
  --color-accent-dark: #c47f1a;
  --color-bg: #f4f9f8;
  --color-bg-alt: #e8f4f2;
  --color-text: #1a2e35;
  --color-text-muted: #4a6570;
  --color-white: #ffffff;
  --color-hero-overlay: rgba(15, 76, 92, 0.88);
  --shadow: 0 4px 24px rgba(15, 76, 92, 0.12);
  --radius: 8px;
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
  --max-width: 1100px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-accent);
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  min-height: 72px;
}

.logo {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  text-decoration: none;
}

.logo:hover {
  color: var(--color-white);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
  padding: 0.35rem 0;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-white);
  border-bottom-color: var(--color-accent);
}

/* Hero */
.hero {
  background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
  text-align: center;
  padding: 3rem 1.5rem 4rem;
}

.hero-tagline {
  font-size: 1.1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 0 0 0.5rem;
  color: var(--color-accent);
}

.hero-sub {
  font-size: 1.25rem;
  margin: 0 0 0.25rem;
  opacity: 0.95;
}

.hero-city {
  font-size: 1.1rem;
  margin: 0 0 2rem;
  opacity: 0.85;
}

.hero h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  line-height: 1.3;
}

.hero h2 {
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 600;
  margin: 0 0 1.5rem;
  color: var(--color-accent);
}

.hero-lead {
  max-width: 800px;
  margin: 0 auto 1.5rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

.hero-quote {
  font-size: 1.15rem;
  font-weight: 700;
  font-style: italic;
  color: var(--color-accent);
  margin: 0;
}

/* Main layout */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.section {
  padding: 3rem 0;
  border-bottom: 1px solid rgba(15, 76, 92, 0.1);
}

.section:last-child {
  border-bottom: none;
}

.section-title {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  color: var(--color-primary);
  margin: 0 0 1.25rem;
  font-weight: 700;
}

.section-title.accent {
  color: var(--color-accent-dark);
}

.section p {
  margin: 0 0 1rem;
  color: var(--color-text);
}

.section p:last-child {
  margin-bottom: 0;
}

/* Two column blocks */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

@media (max-width: 768px) {
  .split {
    grid-template-columns: 1fr;
  }
}

.specs-list p {
  text-align: justify;
}

.specs-list strong {
  color: var(--color-primary);
}

/* Images */
.figure-wrap {
  text-align: center;
}

.figure-wrap img {
  margin: 0 auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.figure-main img {
  max-width: 420px;
}

.figure-device img {
  max-width: 360px;
}

.figure-lamp img {
  max-width: 320px;
}

/* Highlight card */
.highlight-card {
  background: var(--color-bg-alt);
  border-left: 4px solid var(--color-accent);
  padding: 1.5rem 1.75rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 2rem 0;
}

/* Lamp section */
.lamp-section {
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
  margin: 0 -1.5rem;
  padding: 3rem 1.5rem;
}

.lamp-section .section-title {
  text-align: center;
}

.in-stock {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  font-weight: 700;
  padding: 0.5rem 1.5rem;
  border-radius: 999px;
  margin-top: 1rem;
  font-size: 1.1rem;
}

/* Page header (inner pages) */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-secondary));
  color: var(--color-white);
  padding: 2.5rem 1.5rem;
  text-align: center;
}

.page-hero h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.page-hero p {
  margin: 0.75rem 0 0;
  opacity: 0.9;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Contacts */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin-top: 1rem;
}

.contact-card {
  background: var(--color-white);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-top: 4px solid var(--color-accent);
}

.contact-card h3 {
  margin: 0 0 1rem;
  color: var(--color-primary);
}

.contact-card p {
  margin: 0.5rem 0;
}

.contact-card a {
  font-weight: 600;
}

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.8);
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0.25rem 0;
}

.site-footer a {
  color: var(--color-accent);
}

/* Intro banner on home */
.intro-banner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  padding: 3rem 0;
}

@media (max-width: 768px) {
  .intro-banner {
    grid-template-columns: 1fr;
  }
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
}

.feature-list li {
  padding: 0.5rem 0 0.5rem 1.5rem;
  position: relative;
}

.feature-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}