/* ============================================
   WINDOOR — Design Tokens & Styles
   Aluminium windows, doors & glazing, Cheboksary
   Art Direction: Clean, modern, industrial precision
   Palette: Steel grey + warm white + chrome accents
   ============================================ */

/* --- Fonts --- */
/* GothicE (pseudo-gothic display, Cyrillic) + General Sans (body) */
@font-face {
  font-family: 'GothicE';
  src: url('./gothice.woff2') format('woff2'),
       url('./gothice.woff') format('woff');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

/* --- Type Scale --- */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* --- Spacing (4px base) --- */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* --- Font Families --- */
  --font-display: 'GothicE', 'Times New Roman', serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;

  /* --- Radius --- */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* --- Transitions --- */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* --- Content widths --- */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
}

/* ======== LIGHT MODE ======== */
:root, [data-theme="light"] {
  --color-bg:             #f5f7fa;
  --color-surface:        #ffffff;
  --color-surface-2:      #f0f4f8;
  --color-surface-offset: #e8edf3;
  --color-divider:        #d1d9e6;
  --color-border:         #c4cdd9;

  --color-text:           #1a2332;
  --color-text-muted:     #5a6a7e;
  --color-text-faint:     #9aa8b8;
  --color-text-inverse:   #ffffff;

  /* Primary — Steel Grey (industrial precision, reliability) */
  --color-primary:        #3d4f5c;
  --color-primary-hover:  #2e3d48;
  --color-primary-active: #1e2c36;
  --color-primary-light:  #eaecee;

  /* Accent — Chrome Silver (metallic highlight) */
  --color-accent:         #7a8fa0;
  --color-accent-hover:   #5e7585;

  /* Success */
  --color-success:        #27ae60;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(26, 35, 50, 0.06);
  --shadow-md: 0 4px 12px rgba(26, 35, 50, 0.08);
  --shadow-lg: 0 12px 32px rgba(26, 35, 50, 0.12);
}

/* ======== DARK MODE ======== */
[data-theme="dark"] {
  --color-bg:             #0f1419;
  --color-surface:        #1a2029;
  --color-surface-2:      #1f2733;
  --color-surface-offset: #252d3a;
  --color-divider:        #2d3748;
  --color-border:         #3a4556;

  --color-text:           #d4dbe6;
  --color-text-muted:     #8a96a8;
  --color-text-faint:     #5a6678;
  --color-text-inverse:   #1a2332;

  --color-primary:        #8fa8bb;
  --color-primary-hover:  #7898ac;
  --color-primary-active: #62849a;
  --color-primary-light:  #1e2830;

  --color-accent:         #a0b8cc;
  --color-accent-hover:   #8fa8bb;

  --color-success:        #4cca7a;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0f1419;
    --color-surface:        #1a2029;
    --color-surface-2:      #1f2733;
    --color-surface-offset: #252d3a;
    --color-divider:        #2d3748;
    --color-border:         #3a4556;
    --color-text:           #d4dbe6;
    --color-text-muted:     #8a96a8;
    --color-text-faint:     #5a6678;
    --color-text-inverse:   #1a2332;
    --color-primary:        #8fa8bb;
    --color-primary-hover:  #7898ac;
    --color-primary-active: #62849a;
    --color-primary-light:  #1e2830;
    --color-accent:         #a0b8cc;
    --color-accent-hover:   #8fa8bb;
    --color-success:        #4cca7a;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.4);
  }
}

/* ======== GLOBAL STYLES ======== */

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover {
  color: var(--color-primary-hover);
}

/* ======== HEADER ======== */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s ease;
}
.header--scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}
.logo-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding-bottom: 2px;
}
.nav a:hover {
  color: var(--color-text);
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}
.nav a:hover::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.phone-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--color-primary);
  white-space: nowrap;
}
.phone-link:hover {
  color: var(--color-primary-hover);
}
.phone-link svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  padding: var(--space-2);
  color: var(--color-text);
}

@media (max-width: 768px) {
  .nav { display: none; }
  .phone-link span { display: none; }
  .mobile-menu-btn { display: flex; }

  .nav.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-6);
    gap: var(--space-5);
    box-shadow: var(--shadow-md);
  }
}

/* ======== HERO SECTION ======== */

.hero {
  padding: clamp(var(--space-16), 10vw, var(--space-32)) var(--space-6);
  text-align: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}

.hero-content {
  max-width: var(--content-default);
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  letter-spacing: -0.03em;
}

.hero p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto var(--space-8);
  line-height: 1.7;
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--text-sm);
  text-decoration: none;
  box-shadow: var(--shadow-md);
}
.hero-cta:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-10);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.stat {
  text-align: center;
}
.stat-number {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

@media (max-width: 600px) {
  .hero-stats {
    flex-direction: column;
    gap: var(--space-6);
  }
}

/* ======== SECTIONS ======== */

.section {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
}

.section-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.section-header p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto;
}

/* Alternating background */
.section--alt {
  background: var(--color-surface);
}

/* ======== SERVICES GRID ======== */

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.section--alt .service-card {
  background: var(--color-bg);
}
.service-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.service-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-primary);
}

.service-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
}

.service-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ======== ADVANTAGES ======== */

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-6);
}

.advantage-item {
  text-align: center;
  padding: var(--space-6);
}

.advantage-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-5);
  color: var(--color-text-inverse);
}

.advantage-item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.advantage-item p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 280px;
  margin: 0 auto;
}

/* ======== ABOUT SECTION ======== */

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: center;
}

.about-text h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.about-text p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

.about-visual {
  background: var(--color-surface-2);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 4/3;
  border: 1px solid var(--color-divider);
}

@media (max-width: 768px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
}

/* ======== CONTACT SECTION ======== */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.contact-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
}

.contact-item h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  margin-bottom: var(--space-1);
  color: var(--color-text);
}

.contact-item p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
}

.contact-map {
  background: var(--color-surface-2);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-divider);
  overflow: hidden;
  min-height: 300px;
}

.contact-map iframe {
  width: 100%;
  height: 100%;
  min-height: 300px;
  border: 0;
}

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

/* ======== FOOTER ======== */

.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-6);
}

.footer-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
}

.footer-links a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-links a:hover {
  color: var(--color-text);
}

/* ======== SCROLL ANIMATIONS ======== */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ======== DECORATIVE ELEMENTS ======== */

.hero-bg-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  opacity: 0.04;
  background-image:
    linear-gradient(var(--color-primary) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-primary) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ======== PORTFOLIO SECTION ======== */

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.portfolio-card {
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.portfolio-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.portfolio-card-visual {
  height: 220px;
  background: var(--color-surface-offset);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.portfolio-card-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.portfolio-card:hover .portfolio-card-visual img {
  transform: scale(1.04);
}

.portfolio-card-visual svg {
  opacity: 0.35;
}

.portfolio-card-badge {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
}

.portfolio-card-body {
  padding: var(--space-5) var(--space-6);
}

.portfolio-card-body h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.portfolio-card-body p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.55;
}

.portfolio-card-meta {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-divider);
}

.portfolio-meta-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.portfolio-meta-label {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.portfolio-meta-value {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.portfolio-filter {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

/* ======== PRODUCTS / TYPES ======== */

.product-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.product-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.03em;
}

[data-theme="dark"] .product-tag {
  background: var(--color-primary-light);
  color: var(--color-primary);
}