:root {
  /* Color palette - nature-inspired & urban */
  --color-background: #0f1418; /* deep urban slate */
  --color-surface: #171e24; /* elevated surfaces */
  --color-surface-muted: #1f2830;
  --color-text: #f7f9fb;
  --color-text-muted: #a5b0bc;
  --color-border-subtle: #2b3540;

  --color-primary: #3aa47f; /* nature green, modern */
  --color-primary-soft: rgba(58, 164, 127, 0.12);
  --color-primary-strong: #2d8566;

  --color-success: #3cb371;
  --color-warning: #f0a43c;
  --color-danger: #e35757;

  --color-neutral-50: #0c1014;
  --color-neutral-100: #161b21;
  --color-neutral-200: #232a33;
  --color-neutral-300: #3c4651;
  --color-neutral-400: #5a6673;
  --color-neutral-500: #7c8896;
  --color-neutral-600: #99a5b3;
  --color-neutral-700: #c2ccd7;
  --color-neutral-800: #dde3ea;
  --color-neutral-900: #f5f7fb;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
  --font-serif: "Playfair Display", "Times New Roman", serif;
  --font-mono: "JetBrains Mono", Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;

  --font-size-xs: 0.75rem; /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem; /* 16px */
  --font-size-md: 1.0625rem; /* 17px, primary body size */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem; /* 20px */
  --font-size-2xl: 1.5rem; /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem; /* 36px */
  --font-size-5xl: 3rem; /* 48px */

  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem; /* 4px */
  --space-2: 0.5rem; /* 8px */
  --space-3: 0.75rem; /* 12px */
  --space-4: 1rem; /* 16px */
  --space-5: 1.25rem; /* 20px */
  --space-6: 1.5rem; /* 24px */
  --space-7: 1.75rem; /* 28px */
  --space-8: 2rem; /* 32px */
  --space-10: 2.5rem; /* 40px */
  --space-12: 3rem; /* 48px */
  --space-16: 4rem; /* 64px */
  --space-20: 5rem; /* 80px */
  --space-24: 6rem; /* 96px */

  /* Radius */
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
  --radius-full: 999px;

  /* Shadows - subtle, architectural */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.22);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.28);
  --shadow-lg: 0 18px 45px rgba(0, 0, 0, 0.35);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-normal: 180ms ease-out;
  --transition-slow: 260ms ease-out;

  /* Layout */
  --container-width: 1120px;
  --container-gutter: var(--space-4);
}

/*
 * RESET / NORMALIZE
 * -------------------------------------------------- */

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  overflow-x: hidden;
  width: 100%;
}

body {
  margin: 0;
  overflow-x: hidden;
  width: 100%;
}

h1, h2, h3, h4, h5, h6,
p, figure, blockquote,
dl, dd {
  margin: 0;
}

ul, ol {
  margin: 0;
  padding: 0;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, textarea, select {
  margin: 0;
  font: inherit;
  color: inherit;
  background: none;
  border: none;
}

button {
  padding: 0;
  cursor: pointer;
}

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

table {
  border-collapse: collapse;
  border-spacing: 0;
}

:focus {
  outline: none;
}

/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/*
 * BASE STYLES
 * -------------------------------------------------- */

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

@media (max-width: 480px) {
  body {
    font-size: var(--font-size-base);
    line-height: 1.6;
  }
}

main {
  display: block;
  width: 100%;
  overflow-x: hidden;
}

p {
  margin-bottom: var(--space-4);
  /* comfortable reading line length */
  color: var(--color-text-muted);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: var(--line-height-tight);
  color: var(--color-text);
  word-wrap: break-word;
  overflow-wrap: break-word;
}

h1 {
  font-size: clamp(2.4rem, 2vw + 2rem, 3.2rem);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.8rem, 1.2vw + 1.4rem, 2.4rem);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: var(--space-3);
}

h4 {
  font-size: 1.25rem;
  margin-bottom: var(--space-2);
}

h5 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
}

h6 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
  color: var(--color-text-muted);
}

strong, b {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

a {
  position: relative;
  color: var(--color-primary);
  transition: color var(--transition-normal);
}

a:hover {
  color: var(--color-primary-strong);
}

/* minimalist underline accent for in-text links */
a:not(.btn)::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.1em;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  opacity: 0;
  transform: translateY(2px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

a:not(.btn):hover::after,
a:not(.btn):focus-visible::after {
  opacity: 1;
  transform: translateY(0);
}

hr {
  border: none;
  border-top: 1px solid var(--color-border-subtle);
  margin: var(--space-8) 0;
}

code, pre {
  font-family: var(--font-mono);
}

::selection {
  background-color: var(--color-primary-soft);
  color: var(--color-text);
}

/*
 * ACCESSIBILITY & FOCUS
 * -------------------------------------------------- */

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

/* for dark surfaces, make focus ring more visible */
[data-surface="dark"] :focus-visible {
  outline-color: #e4f8f1;
}

/* Screen-reader-only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sr-only-focusable:focus,
.sr-only-focusable:active {
  position: static;
  width: auto;
  height: auto;
  margin: 0;
  overflow: visible;
  clip: auto;
  white-space: normal;
}

/*
 * UTILITIES
 * -------------------------------------------------- */

.container {
  width: 100%;
  max-width: calc(var(--container-width) + var(--container-gutter) * 2);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

.section {
  padding-top: var(--space-12);
  padding-bottom: var(--space-12);
}

.section--dense {
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

@media (max-width: 640px) {
  .flex-between {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
  
  .container {
    padding-left: max(var(--container-gutter), 1rem);
    padding-right: max(var(--container-gutter), 1rem);
  }
  
  .flex-wrap {
    flex-direction: column;
  }
  
  .split {
    gap: var(--space-4);
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }
  
  .section {
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }
  
  .section--dense {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }
  
  h1 {
    margin-bottom: var(--space-3);
  }
  
  h2 {
    margin-bottom: var(--space-2);
  }
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.py-4 {
  padding-top: var(--space-4);
  padding-bottom: var(--space-4);
}

.py-6 {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.px-4 {
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.hidden {
  display: none !important;
}

.max-w-readable {
  max-width: 72ch;
}

/* Utility for surface blocks (sections, cards) */
.surface {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
}

/*
 * COMPONENTS
 * -------------------------------------------------- */

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1.35rem;
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  white-space: nowrap;
  background-color: var(--color-primary);
  color: #08110e;
  box-shadow: var(--shadow-xs);
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal),
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    transform var(--transition-fast);
}

@media (max-width: 640px) {
  .btn {
    width: 100%;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 0.85rem;
  }
}

.btn:hover {
  background-color: var(--color-primary-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

.btn:focus-visible {
  outline: 2px solid #e4f8f1;
  outline-offset: 3px;
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border-subtle);
  box-shadow: none;
}

.btn--ghost:hover {
  background-color: var(--color-surface-muted);
  border-color: var(--color-neutral-400);
}

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

.btn--secondary:hover {
  background-color: var(--color-surface-muted);
}

.btn--danger {
  background-color: var(--color-danger);
  color: #fff7f7;
}

.btn--danger:hover {
  background-color: #c94949;
}

.btn[disabled],
.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

/* Inputs & form controls */

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.input,
textarea,
select {
  width: 100%;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: #0c1014;
  color: var(--color-text);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition:
    border-color var(--transition-normal),
    box-shadow var(--transition-normal),
    background-color var(--transition-normal);
}

@media (max-width: 640px) {
  .input,
  textarea,
  select {
    padding: 0.75rem 1rem;
    font-size: var(--font-size-base);
  }
}

.input::placeholder,
textarea::placeholder {
  color: var(--color-neutral-400);
}

.input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
}

.input[disabled],
textarea[disabled],
select[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* Cards - for product highlights, case studies, etc. */

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  border-radius: var(--radius-xl);
  background: radial-gradient(circle at top left, rgba(58, 164, 127, 0.08), transparent 55%),
    var(--color-surface);
  border: 1px solid rgba(255, 255, 255, 0.03);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

@media (max-width: 768px) {
  .card {
    padding: var(--space-4);
    gap: var(--space-2);
  }
  
  .card__header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  
  .card__footer {
    padding-top: var(--space-2);
  }
  
  .card__title {
    font-size: 1rem;
  }
  
  .card__subtitle {
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .card {
    padding: var(--space-3);
    border-radius: var(--radius-lg);
  }
  
  .card__title {
    font-size: 0.95rem;
  }
}

.card--muted {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.card__title {
  font-size: 1.1rem;
  font-weight: 600;
}

.card__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

.card__footer {
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border-subtle);
}

/* Image wrapper for cards and hero visuals */

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-neutral-100);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--elevated {
  box-shadow: var(--shadow-lg);
}

@media (max-width: 768px) {
  .media-frame {
    border-radius: var(--radius-md);
  }
  
  .media-frame--elevated {
    box-shadow: var(--shadow-md);
  }
}

@media (max-width: 480px) {
  .media-frame {
    border-radius: var(--radius-sm);
  }
}

/* Badges / tags (e.g., categories, materials, use cases) */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.15rem 0.6rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background-color: rgba(10, 14, 17, 0.85);
  font-size: var(--font-size-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-neutral-700);
}

@media (max-width: 640px) {
  .badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
  }
}

.badge--accent {
  border-color: var(--color-primary-soft);
  background-color: rgba(58, 164, 127, 0.08);
  color: #d2f2e6;
}

/* Simple layout helper for hero/content split */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.1fr);
  gap: var(--space-10);
  align-items: center;
}

@media (max-width: 960px) {
  .split {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

@media (max-width: 640px) {
  .split {
    gap: var(--space-4);
  }
}

/* Navigation basics (header) */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(16px);
  background: linear-gradient(
    to bottom,
    rgba(9, 12, 16, 0.92),
    rgba(9, 12, 16, 0.75),
    transparent
  );
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.navbar__link {
  position: relative;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.navbar__link:hover,
.navbar__link[aria-current="page"] {
  color: var(--color-text);
}

.navbar__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 1.75rem;
  height: 2px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--color-primary), transparent);
}

@media (max-width: 960px) {
  .navbar__links {
    display: none;
  }
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
  background: radial-gradient(circle at top, rgba(58, 164, 127, 0.05), transparent 60%),
    #05080b;
}

.site-footer p {
  }

/*
 * END
 */