/* ==========================================================================
   SES Environmental — Design System
   "Clean air, protected property."
   Foundation: tokens → layout → components. Mobile-first, WCAG AA floor.
   ========================================================================== */

/* ---------- 1. TOKENS ---------- */
:root {
  /* Brand ramp — midnight teal base, "air" green accent */
  --teal-950: #04191A;
  --teal-900: #06282B;
  --teal-850: #083133;
  --teal-800: #0B3B3C;
  --teal-700: #10504F;
  --teal-600: #176B68;
  --teal-400: #3E9C95;
  --teal-200: #9FD4CC;

  --air-500: #38E8A0;
  --air-400: #5FF3B6;
  --air-300: #8DF8CD;
  --air-700: #17B37A;
  --air-900: #0A6B47;

  --amber-400: #F5B957;
  --amber-300: #FFCF85;

  /* Semantic — dark is the default surface identity */
  --bg: var(--teal-950);
  --bg-raised: var(--teal-900);
  --bg-raised-2: var(--teal-850);
  --bg-inset: #030f10;
  --surface-glass: rgba(11, 59, 60, 0.55);
  --line: rgba(159, 212, 204, 0.16);
  --line-strong: rgba(159, 212, 204, 0.3);

  --text: #EAF6F2;
  --text-muted: #A8C7C1;
  --text-dim: #7E9E99;
  --text-inverse: #04201F;

  --accent: var(--air-500);
  --accent-text: #052E23; /* on light: contrast > 7:1 on air-500 */
  --focus: var(--air-300);

  /* Type scale — 1.25 modular, clamped for fluid responsive */
  --font-sans: "Inter", "Söhne", -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, Helvetica, Arial, sans-serif;
  --font-display: "Inter Tight", "Inter", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --fs-100: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);
  --fs-200: clamp(0.875rem, 0.84rem + 0.18vw, 0.9375rem);
  --fs-300: clamp(1rem, 0.96rem + 0.22vw, 1.0625rem);
  --fs-400: clamp(1.125rem, 1.06rem + 0.3vw, 1.25rem);
  --fs-500: clamp(1.375rem, 1.25rem + 0.6vw, 1.75rem);
  --fs-600: clamp(1.75rem, 1.5rem + 1.15vw, 2.5rem);
  --fs-700: clamp(2.25rem, 1.7rem + 2.6vw, 4rem);
  --fs-800: clamp(2.75rem, 1.75rem + 4.6vw, 5.5rem);

  --lh-tight: 1.05;
  --lh-snug: 1.2;
  --lh-normal: 1.6;
  --tracking-tight: -0.03em;
  --tracking-wide: 0.18em;

  /* Spacing — 4px base */
  --sp-1: 0.25rem;
  --sp-2: 0.5rem;
  --sp-3: 0.75rem;
  --sp-4: 1rem;
  --sp-5: 1.5rem;
  --sp-6: 2rem;
  --sp-7: 3rem;
  --sp-8: 4rem;
  --sp-9: 6rem;
  --section-y: clamp(3.5rem, 2rem + 7vw, 7.5rem);

  /* Radii */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-xl: 32px;
  --r-pill: 999px;

  /* Elevation */
  --sh-1: 0 1px 2px rgba(0, 0, 0, 0.4);
  --sh-2: 0 6px 20px -6px rgba(0, 0, 0, 0.5);
  --sh-3: 0 18px 48px -18px rgba(0, 0, 0, 0.7);
  --glow: 0 0 0 1px rgba(56, 232, 160, 0.28), 0 12px 40px -12px rgba(56, 232, 160, 0.35);

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-1: 140ms;
  --dur-2: 260ms;
  --dur-3: 520ms;

  --container: 76rem;
  --container-narrow: 48rem;
  --nav-h: 68px;
}

/* Light theme — token swap only, no component changes */
[data-theme="light"] {
  --bg: #F4F8F6;
  --bg-raised: #FFFFFF;
  --bg-raised-2: #EAF2EF;
  --bg-inset: #E2ECEA;
  --surface-glass: rgba(255, 255, 255, 0.72);
  --line: rgba(6, 40, 43, 0.12);
  --line-strong: rgba(6, 40, 43, 0.24);

  --text: #05201F;
  --text-muted: #3D5C58;
  --text-dim: #5A7B77;
  --text-inverse: #F4F8F6;

  --accent: var(--air-700);
  --accent-text: #FFFFFF;
  --focus: var(--air-900);

  --sh-1: 0 1px 2px rgba(6, 40, 43, 0.08);
  --sh-2: 0 8px 24px -10px rgba(6, 40, 43, 0.22);
  --sh-3: 0 20px 50px -24px rgba(6, 40, 43, 0.32);
  --glow: 0 0 0 1px rgba(23, 179, 122, 0.3), 0 12px 36px -14px rgba(23, 179, 122, 0.35);
}

/* ---------- 2. RESET ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1rem);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-300);
  line-height: var(--lh-normal);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.is-locked {
  overflow: hidden;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
  margin: 0 0 var(--sp-3);
  text-wrap: balance;
}

h1 {
  font-size: var(--fs-800);
}
h2 {
  font-size: var(--fs-600);
}
h3 {
  font-size: var(--fs-400);
}
h4 {
  font-size: var(--fs-300);
}

p {
  margin: 0 0 var(--sp-4);
  text-wrap: pretty;
}

a {
  color: var(--accent);
  text-underline-offset: 0.22em;
  text-decoration-thickness: from-font;
}

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

ul,
ol {
  margin: 0 0 var(--sp-4);
  padding-left: 1.15em;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: var(--sp-6) 0;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--air-500);
  color: var(--text-inverse);
}

.skip-link {
  position: absolute;
  left: var(--sp-3);
  top: -100px;
  z-index: 200;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 700;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
  transition: top var(--dur-2) var(--ease-out);
}
.skip-link:focus {
  top: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 3. LAYOUT ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 0.6rem + 2.4vw, 2.5rem);
}
.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  position: relative;
  padding-block: var(--section-y);
}
.section--tight {
  padding-block: clamp(2.5rem, 1.5rem + 4vw, 4.5rem);
}

.grid {
  display: grid;
  gap: var(--sp-5);
}
@media (min-width: 640px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 900px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1100px) {
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.split {
  display: grid;
  gap: clamp(2rem, 1rem + 4vw, 4rem);
  align-items: center;
}
@media (min-width: 900px) {
  .split {
    grid-template-columns: 1fr 1fr;
  }
  .split--wide-media {
    grid-template-columns: 1.05fr 0.95fr;
  }
  .split--media-first .split__media {
    order: -1;
  }
}

.stack > * + * {
  margin-top: var(--sp-4);
}
.stack--lg > * + * {
  margin-top: var(--sp-5);
}

/* ---------- 4. TYPE UTILITIES ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--sp-3);
}
.eyebrow::before {
  content: "";
  width: 1.75rem;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.lede {
  font-size: var(--fs-400);
  color: var(--text-muted);
  max-width: 46ch;
}

.muted {
  color: var(--text-muted);
}
.dim {
  color: var(--text-dim);
}
.mono {
  font-family: var(--font-mono);
}
.gradient-text {
  background: linear-gradient(100deg, var(--air-300), var(--air-500) 45%, var(--amber-300));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
/* The light-mint end of the ramp is invisible on a pale ground, so the light
   theme uses the deep end of the same ramp instead. */
[data-theme="light"] .gradient-text {
  background: linear-gradient(100deg, var(--air-700), var(--teal-700) 45%, #8A6410);
  -webkit-background-clip: text;
  background-clip: text;
}

.section-head {
  max-width: 60ch;
  margin-bottom: clamp(2rem, 1rem + 3vw, 3.25rem);
}

/* ---------- 5. BUTTONS ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--text);
  --btn-line: var(--line-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  min-height: 48px;
  padding: 0.7rem 1.4rem;
  font-family: var(--font-sans);
  font-size: var(--fs-200);
  font-weight: 650;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--btn-fg);
  background: var(--btn-bg);
  border: 1px solid var(--btn-line);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: transform var(--dur-1) var(--ease-out),
    background var(--dur-2) var(--ease-out), border-color var(--dur-2) var(--ease-out),
    box-shadow var(--dur-2) var(--ease-out), color var(--dur-2) var(--ease-out);
}
.btn:hover {
  transform: translateY(-2px);
}
.btn:active {
  transform: translateY(0);
}
.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn--primary {
  --btn-bg: var(--air-500);
  --btn-fg: #052E23;
  --btn-line: transparent;
  font-weight: 700;
  box-shadow: 0 6px 22px -10px rgba(56, 232, 160, 0.8);
}
.btn--primary:hover {
  --btn-bg: var(--air-400);
  box-shadow: 0 12px 34px -10px rgba(56, 232, 160, 0.95);
}

.btn--ghost {
  --btn-line: var(--line-strong);
  backdrop-filter: blur(10px);
  background: var(--surface-glass);
}
.btn--ghost:hover {
  --btn-line: var(--accent);
  --btn-fg: var(--accent);
}

.btn--solid {
  --btn-bg: var(--bg-raised);
  --btn-line: var(--line);
}
.btn--solid:hover {
  --btn-line: var(--accent);
}

.btn--lg {
  min-height: 56px;
  padding: 0.9rem 1.9rem;
  font-size: var(--fs-300);
}
.btn--block {
  width: 100%;
}

.btn__arrow {
  transition: transform var(--dur-2) var(--ease-out);
}
.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* ---------- 6. CARDS ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: clamp(1.25rem, 0.9rem + 1.4vw, 1.85rem);
  overflow: hidden;
  transition: transform var(--dur-2) var(--ease-out),
    border-color var(--dur-2) var(--ease-out), box-shadow var(--dur-2) var(--ease-out);
}
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(120% 90% at 0% 0%, rgba(56, 232, 160, 0.12), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-3) var(--ease-out);
  pointer-events: none;
}
.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--sh-3);
}
.card:hover::after,
.card:focus-within::after {
  opacity: 1;
}
.card h3 {
  margin-bottom: var(--sp-2);
}
.card p:last-child {
  margin-bottom: 0;
}
.card__media {
  position: relative;
  aspect-ratio: 3 / 2;
  margin: calc(-1 * clamp(1.25rem, 0.9rem + 1.4vw, 1.85rem))
    calc(-1 * clamp(1.25rem, 0.9rem + 1.4vw, 1.85rem))
    var(--sp-4);
  overflow: hidden;
  background: var(--bg-inset);
}
.card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.02);
  transition: transform 900ms var(--ease-out);
}
.card:hover .card__media img {
  transform: scale(1.08);
}
.card__index {
  position: absolute;
  top: 0.75rem;
  left: clamp(1.25rem, 0.9rem + 1.4vw, 1.85rem);
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  color: var(--text-dim);
  letter-spacing: 0.1em;
  z-index: 2;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  margin-top: auto;
  padding-top: var(--sp-4);
  font-weight: 650;
  text-decoration: none;
  color: var(--accent);
}
.link-arrow::after {
  content: "→";
  transition: transform var(--dur-2) var(--ease-out);
}
.link-arrow:hover::after {
  transform: translateX(5px);
}

/* ---------- 7. CHIPS / BADGES ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.4rem 0.85rem;
  font-size: var(--fs-100);
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface-glass);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  backdrop-filter: blur(8px);
}
.chip--live {
  color: var(--accent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
}
.chip__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 70%, transparent);
  animation: pulse-dot 2.4s var(--ease-out) infinite;
}
@keyframes pulse-dot {
  0% {
    box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent);
  }
  70% {
    box-shadow: 0 0 0 10px transparent;
  }
  100% {
    box-shadow: 0 0 0 0 transparent;
  }
}

/* ---------- 8. STATS ---------- */
.stat {
  padding: var(--sp-4) 0;
  border-top: 1px solid var(--line);
}
.stat__value {
  font-family: var(--font-display);
  font-size: var(--fs-600);
  font-weight: 700;
  line-height: 1;
  letter-spacing: var(--tracking-tight);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.stat__label {
  margin-top: var(--sp-2);
  font-size: var(--fs-200);
  color: var(--text-muted);
}

/* ---------- 9. FORMS ---------- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
}
.field label {
  font-size: var(--fs-200);
  font-weight: 600;
}
.field .hint {
  font-size: var(--fs-100);
  color: var(--text-dim);
}
input,
textarea,
select {
  font-family: inherit;
  font-size: var(--fs-300);
  color: var(--text);
  background: var(--bg-inset);
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  padding: 0.85rem 1rem;
  min-height: 52px;
  width: 100%;
  transition: border-color var(--dur-2) var(--ease-out),
    box-shadow var(--dur-2) var(--ease-out);
}
textarea {
  min-height: 140px;
  resize: vertical;
}
input::placeholder,
textarea::placeholder {
  color: var(--text-dim);
}
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%),
    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: calc(100% - 22px) 55%, calc(100% - 16px) 55%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 2.75rem;
}
[data-theme="light"] input,
[data-theme="light"] textarea,
[data-theme="light"] select {
  background-color: #FFFFFF;
}

.form-status {
  margin-top: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--r-md);
  font-size: var(--fs-200);
  border: 1px solid var(--line-strong);
  background: var(--bg-raised);
}
.form-status[hidden] {
  display: none;
}

/* ---------- 10. SCROLL REVEAL ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms var(--ease-out), transform 700ms var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 11. MOTION PREFERENCES ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 12. PRINT ---------- */
@media print {
  .site-header,
  .site-footer,
  .hero,
  .emergency-bar {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
}

/* Media fallback — used where a photograph is withheld pending image
   provenance approval. A quiet, branded panel rather than a broken <img>
   and, deliberately, not a stand-in illustration: an unapproved photo of
   "our work" is the thing we are holding.

   It must still read as a finished card, not a hole in the layout, so it
   carries the mark as a watermark plus a faint horizon line. */
.media-fallback {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 12rem;
  display: grid;
  place-items: center;
  background:
    radial-gradient(120% 90% at 30% 20%,
      color-mix(in srgb, var(--brand, #2dd4bf) 12%, transparent), transparent 60%),
    linear-gradient(160deg, var(--bg-inset), var(--bg, #04191a));
  border: 1px solid var(--line);
  border-radius: var(--r-xl, 1rem);
  overflow: hidden;
}
.media-fallback::before {
  /* watermark: the logo at low opacity so the panel is unmistakably ours */
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("../img/logo.png");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 34% auto;
  opacity: 0.1;
  filter: grayscale(1);
}
.media-fallback::after {
  /* a quiet horizon, echoing the hero skyline */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 18%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--accent, #38e8a0) 32%, transparent),
    transparent
  );
}