/* ===================================================================
   BASE & RESET
   =================================================================== */

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px; /* offset for sticky header */
}

html,
body {
  margin: 0;
  font-family: var(--font-family);
  background: transparent; /* allow background image to show through */
  color: var(--text);
  line-height: 1.6;
}

/* Fixed background layer with gradient overlay and image */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, var(--overlay-gradient-top) 0%, var(--overlay-gradient-mid) 40%, var(--overlay-gradient-bottom) 100%),
    url('../assets/power-lines-raw-pixel-wikimedia.jpg') center / cover no-repeat fixed;
}


/* ===================================================================
   LAYOUT
   =================================================================== */

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: var(--space-3);
}

main.wrap {
  padding-bottom: var(--space-6);
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

#services {
  margin-bottom: var(--space-4);
}


/* ===================================================================
   TYPOGRAPHY
   =================================================================== */

h1 {
  font-size: clamp(1.8rem, 2.6vw, 2.6rem);
  line-height: var(--line-height-tight);
  margin: 0 0 var(--space-2) 0;
}

h2 {
  font-size: var(--font-size-xl);
  margin: 0 0 var(--space-1) 0;
}

.title {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  letter-spacing: var(--letter-spacing-normal);
}

.tag {
  color: var(--muted);
  margin: 0 0 var(--space-3) 0;
  font-size: var(--font-size-lg);
}

.kicker {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-tight);
  text-transform: uppercase;
  color: var(--muted);
}


/* ===================================================================
   COMPONENTS
   =================================================================== */

/* Brand
   ------------------------------------------------------------------- */

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: inherit;
}

.brand img {
  height: 52px;
  width: auto;
  object-fit: contain;
}

/* Logo theme switching */
.logo-light {
  display: inline;
}

.logo-dark {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .logo-light {
    display: none;
  }

  .logo-dark {
    display: inline;
  }
}

/* Manual theme overrides for logos */
html.theme-dark .logo-light {
  display: none;
}

html.theme-dark .logo-dark {
  display: inline;
}

html.theme-light .logo-light {
  display: inline;
}

html.theme-light .logo-dark {
  display: none;
}


/* Header
   ------------------------------------------------------------------- */

header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  backdrop-filter: var(--backdrop-blur-lg);
  background: var(--overlay-header);
  border-bottom: 1px solid var(--border);
}

header .wrap {
  position: relative;
  padding-top: var(--space-1);
  padding-bottom: var(--space-1);
}


/* Navigation
   ------------------------------------------------------------------- */

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
  color: var(--text);
  transition: color var(--transition-fast);
}

.hamburger:hover {
  color: var(--brand);
}

.hamburger .icon {
  width: var(--icon-size-md);
  height: var(--icon-size-md);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
  color: var(--text);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  color: var(--brand);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  width: var(--icon-size-md);
  height: var(--icon-size-md);
}

/* Show sun icon in dark mode, moon icon in light mode */
.theme-toggle .icon-sun {
  display: none;
}

.theme-toggle .icon-moon {
  display: block;
}

@media (prefers-color-scheme: dark) {
  .theme-toggle .icon-sun {
    display: block;
  }

  .theme-toggle .icon-moon {
    display: none;
  }
}

/* Manual theme overrides */
html.theme-dark .theme-toggle .icon-sun {
  display: block;
}

html.theme-dark .theme-toggle .icon-moon {
  display: none;
}

html.theme-light .theme-toggle .icon-sun {
  display: none;
}

html.theme-light .theme-toggle .icon-moon {
  display: block;
}

.text-nav {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  margin-left: auto;
}

.text-nav a {
  text-decoration: none;
  color: var(--text);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  transition: color var(--transition-fast);
}

.text-nav a:hover {
  color: var(--brand);
}


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

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px solid var(--border);
  background: var(--brand);
  color: white;
  text-decoration: none;
  padding: var(--space-2);
  border-radius: var(--radius-pill);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow);
}

.btn.secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn.btn-full-width {
  width: 100%;
  justify-content: center;
}


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

.hero {
  margin-top: var(--space-4);
  padding: clamp(var(--space-4), 6vw, 64px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--overlay-surface);
  backdrop-filter: var(--backdrop-blur-lg);
  box-shadow: var(--shadow);
}


/* Cards
   ------------------------------------------------------------------- */

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--overlay-surface);
  padding: var(--space-3);
  box-shadow: var(--shadow);
  backdrop-filter: var(--backdrop-blur-sm);
}


/* Forms
   ------------------------------------------------------------------- */

.contact-form {
  margin-top: var(--space-2);
}

.form-group {
  margin-bottom: var(--space-2);
}

.form-group label {
  display: block;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-1);
  color: var(--text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  font-size: var(--font-size-base);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--brand);
}

.form-group textarea {
  resize: vertical;
  min-height: var(--space-6);
}

.form-status {
  margin-top: var(--space-2);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  display: none;
}

.form-status.success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success-border);
}

.form-status.error {
  background: var(--error-bg);
  color: var(--error);
  border: 1px solid var(--error-border);
}

.form-status.show {
  display: block;
}


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

footer {
  padding: var(--space-4) var(--space-3);
  color: var(--text);
  font-size: var(--font-size-sm);
  text-align: center;
  backdrop-filter: var(--backdrop-blur-lg);
  background: var(--overlay-footer);
  border-top: 1px solid var(--border);
  margin-top: var(--space-6);
}


/* ===================================================================
   UTILITIES
   =================================================================== */

/* Focus styles */
.text-nav a:focus-visible,
.btn:focus-visible,
.theme-toggle:focus-visible,
.hamburger:focus-visible {
  outline: var(--outline-width) solid var(--accent);
  outline-offset: var(--outline-offset);
}

.muted {
  color: var(--muted);
}

ul.clean {
  margin: var(--space-2) 0 0 0;
  padding: 0;
  list-style: none;
}

ul.clean li {
  display: grid;
  grid-template-columns: var(--icon-size-md) 1fr;
  gap: var(--space-2);
  align-items: start;
  padding: var(--space-1) 0;
}

.icon {
  width: var(--icon-size-sm);
  height: var(--icon-size-sm);
  margin-top: 3px; /* optical alignment with text baseline */
}


/* ===================================================================
   MEDIA QUERIES
   =================================================================== */

@media (min-width: 1000px) {
  .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .wrap {
    padding: var(--space-2);
  }

  .hamburger {
    display: block;
    margin-left: auto;
  }

  .text-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--overlay-surface);
    backdrop-filter: var(--backdrop-blur-lg);
    border-bottom: 1px solid var(--border);
    padding: var(--space-2) 0;
    display: none;
    box-shadow: var(--shadow);
    z-index: calc(var(--z-sticky) - 1);
    margin-left: 0;
  }

  .text-nav.active {
    display: flex;
  }

  .text-nav a {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-base);
    width: 100%;
    border-bottom: 1px solid var(--border);
  }

  .text-nav a:last-child {
    border-bottom: none;
  }

  .text-nav a:hover {
    background: var(--overlay-header);
  }
}