/* ============================================================
   Eco Water Solutions — style.css
   Clean, modern blue/green eco design system
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  /* Type scale (fluid) */
  --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 */
  --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;

  /* Radius */
  --radius-sm: 0.375rem; --radius-md: 0.625rem; --radius-lg: 1rem; --radius-xl: 1.5rem; --radius-full: 9999px;

  /* Widths */
  --content-narrow: 680px; --content-default: 1000px; --content-wide: 1240px;

  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Source Sans 3', system-ui, -apple-system, sans-serif;
}

/* Light (default) */
:root, [data-theme='light'] {
  --color-bg: #f5faf8;
  --color-surface: #ffffff;
  --color-surface-2: #eef6f3;
  --color-surface-offset: #e5f1ed;
  --color-border: #d3e6df;
  --color-divider: #e2efeb;

  --color-text: #10312c;
  --color-text-muted: #4c6862;
  --color-text-faint: #86a29b;
  --color-text-inverse: #f5faf8;

  /* Primary — deep teal */
  --color-primary: #0f7a6f;
  --color-primary-hover: #0b5f56;
  --color-primary-active: #084a43;
  --color-primary-soft: #d5ebe6;

  /* Accent — fresh green */
  --color-accent: #4ca64c;
  --color-accent-hover: #3d8a3d;

  /* Deep blue (water) */
  --color-blue: #1a6ea8;
  --color-blue-soft: #d7e8f2;

  --color-warning: #c26a12;

  --shadow-sm: 0 1px 2px rgba(16, 49, 44, 0.06);
  --shadow-md: 0 6px 20px rgba(16, 49, 44, 0.09);
  --shadow-lg: 0 18px 44px rgba(16, 49, 44, 0.14);
  --shadow-primary: 0 10px 30px rgba(15, 122, 111, 0.28);
}

[data-theme='dark'] {
  --color-bg: #0a1614;
  --color-surface: #10201d;
  --color-surface-2: #142823;
  --color-surface-offset: #16302a;
  --color-border: #244039;
  --color-divider: #1c332e;

  --color-text: #e2efeb;
  --color-text-muted: #96b3ab;
  --color-text-faint: #5f7d75;
  --color-text-inverse: #0a1614;

  --color-primary: #2fb3a3;
  --color-primary-hover: #45c7b7;
  --color-primary-active: #5ad3c4;
  --color-primary-soft: #143b35;

  --color-accent: #63c463;
  --color-accent-hover: #79d179;

  --color-blue: #4c9fd4;
  --color-blue-soft: #16303f;

  --color-warning: #e08a3a;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 6px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 18px 44px rgba(0,0,0,0.5);
  --shadow-primary: 0 10px 30px rgba(47, 179, 163, 0.25);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #0a1614; --color-surface: #10201d; --color-surface-2: #142823;
    --color-surface-offset: #16302a; --color-border: #244039; --color-divider: #1c332e;
    --color-text: #e2efeb; --color-text-muted: #96b3ab; --color-text-faint: #5f7d75;
    --color-text-inverse: #0a1614; --color-primary: #2fb3a3; --color-primary-hover: #45c7b7;
    --color-primary-active: #5ad3c4; --color-primary-soft: #143b35; --color-accent: #63c463;
    --color-accent-hover: #79d179; --color-blue: #4c9fd4; --color-blue-soft: #16303f;
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  -webkit-text-size-adjust: none; text-size-adjust: none;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility; scroll-behavior: smooth; scroll-padding-top: 6rem;
}
body {
  min-height: 100dvh; line-height: 1.65; font-family: var(--font-body);
  font-size: var(--text-base); color: var(--color-text); background: var(--color-bg);
}
img, picture, video, svg { display: block; max-width: 100%; height: auto; }
ul[role='list'] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1,h2,h3,h4 { font-family: var(--font-display); text-wrap: balance; line-height: 1.1; font-weight: 700; letter-spacing: -0.02em; }
p, li { text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; background: none; border: none; }
::selection { background: color-mix(in oklab, var(--color-primary) 25%, transparent); }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--radius-sm); }
a, button { transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition), transform var(--transition); }
.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; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--content-wide); margin-inline: auto; padding-inline: var(--space-6); }
.wrap-narrow { max-width: var(--content-narrow); }
.wrap-default { max-width: var(--content-default); }
.section { padding-block: clamp(var(--space-16), 8vw, var(--space-32)); }
.section-sm { padding-block: clamp(var(--space-12), 6vw, var(--space-20)); }

.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--color-primary);
}
.eyebrow::before { content: ''; width: 22px; height: 2px; background: var(--color-accent); border-radius: 2px; }

.lead { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 60ch; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  padding: var(--space-3) var(--space-6); font-size: var(--text-sm); font-weight: 700;
  border-radius: var(--radius-full); white-space: nowrap;
}
.btn-primary { background: var(--color-primary); color: #fff; box-shadow: var(--shadow-primary); }
.btn-primary:hover { background: var(--color-primary-hover); transform: translateY(-2px); }
.btn-outline { border: 1.5px solid var(--color-border); color: var(--color-text); background: var(--color-surface); }
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); transform: translateY(-2px); }
.btn-white { background: #fff; color: var(--color-primary); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); }

/* ---------- Header ---------- */
.header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px); border-bottom: 1px solid var(--color-divider);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--space-6); min-height: 72px; padding-block: var(--space-2); }
.brand { display: flex; align-items: center; gap: var(--space-3); font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; line-height: 1.15; letter-spacing: -0.02em; color: var(--color-text); }
.brand svg { flex-shrink: 0; }
.brand-logo { flex-shrink: 0; width: 40px; height: 40px; object-fit: contain; }
.brand-logo-full { display: block; width: 120px; height: auto; max-width: 100%; }
.footer .brand { margin-bottom: var(--space-4); }
.brand > span { display: flex; flex-direction: column; justify-content: center; }
.brand .brand-sub { display:block; font-family: var(--font-body); font-weight: 500; font-size: 0.68rem; line-height: 1.3; letter-spacing: 0.06em; color: var(--color-text-muted); text-transform: uppercase; }
.nav { display: flex; align-items: center; gap: var(--space-1); }
.nav a { padding: var(--space-2) var(--space-3); font-size: var(--text-sm); font-weight: 600; color: var(--color-text-muted); border-radius: var(--radius-md); }
.nav a:hover, .nav a[aria-current='page'] { color: var(--color-primary); background: var(--color-surface-2); }
.header-actions { display: flex; align-items: center; gap: var(--space-3); }
.theme-toggle { display:grid; place-items:center; width:40px; height:40px; border-radius: var(--radius-full); color: var(--color-text-muted); border: 1px solid var(--color-border); }
.theme-toggle:hover { color: var(--color-primary); border-color: var(--color-primary); }
.menu-btn { display: none; width: 44px; height: 44px; place-items: center; border-radius: var(--radius-md); color: var(--color-text); }

.mobile-nav { display: none; flex-direction: column; gap: var(--space-1); padding: var(--space-4) 0 var(--space-6); border-top: 1px solid var(--color-divider); }
.mobile-nav.open { display: flex; }
.mobile-nav a { padding: var(--space-3) var(--space-4); font-weight: 600; border-radius: var(--radius-md); color: var(--color-text); }
.mobile-nav a:hover { background: var(--color-surface-2); color: var(--color-primary); }
.mobile-nav .btn { margin-top: var(--space-3); }

@media (max-width: 860px) {
  .nav, .header-actions .btn { display: none; }
  .menu-btn { display: grid; }
}

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(var(--space-8), 5vw, var(--space-20)); align-items: center; padding-block: clamp(var(--space-16), 7vw, var(--space-32)); }
.hero-title { font-size: var(--text-2xl); margin-block: var(--space-4) var(--space-5); }
.hero-title .accent { color: var(--color-primary); }
.hero p { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 52ch; }
.hero-solo { grid-template-columns: 1fr; max-width: 860px; margin-inline: auto; text-align: center; }
.hero-solo .eyebrow { justify-content: center; }
.hero-solo .hero-title { max-width: 18ch; margin-inline: auto; }
.hero-solo p { max-width: 60ch; margin-inline: auto; }
.hero-slogan { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 600; color: var(--color-primary) !important; letter-spacing: 0.01em; margin-top: var(--space-4); max-width: none !important; }
.hero-solo .hero-cta { justify-content: center; }
.hero-solo .trust-row { justify-content: center; }
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-4); margin-top: var(--space-8); }
.hero-media { position: relative; }
.hero-media img { width: 100%; border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); aspect-ratio: 4/3; object-fit: cover; }
.hero-badge {
  position: absolute; bottom: -18px; left: -18px; background: var(--color-surface);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg); display: flex; align-items: center; gap: var(--space-3); max-width: 260px;
}
.hero-badge .dot { width: 42px; height: 42px; flex-shrink:0; display:grid; place-items:center; border-radius: var(--radius-full); background: var(--color-primary-soft); color: var(--color-primary); }
.hero-badge strong { display:block; font-family: var(--font-display); font-size: 1rem; }
.hero-badge span { font-size: var(--text-xs); color: var(--color-text-muted); }

.trust-row { display:flex; flex-wrap: wrap; gap: var(--space-6) var(--space-8); margin-top: var(--space-10); padding-top: var(--space-8); border-top: 1px solid var(--color-divider); }
.trust-item { display:flex; align-items:center; gap: var(--space-3); font-size: var(--text-sm); font-weight: 600; color: var(--color-text-muted); }
.trust-item svg { color: var(--color-primary); flex-shrink: 0; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-media { order: -1; }
  .hero-badge { left: var(--space-4); bottom: var(--space-4); }
}

/* ---------- Section heads ---------- */
.section-head { max-width: 60ch; margin-bottom: var(--space-12); }
.section-head.center { margin-inline: auto; text-align: center; }
.section-head h2 { font-size: var(--text-xl); margin-block: var(--space-3) var(--space-4); }
.section-head p { color: var(--color-text-muted); font-size: var(--text-base); }

/* ---------- Service cards ---------- */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.service-card {
  background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl);
  overflow: hidden; display: flex; flex-direction: column; box-shadow: var(--shadow-sm);
}
.service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: color-mix(in oklab, var(--color-primary) 40%, var(--color-border)); }
.service-card img { aspect-ratio: 4/3; object-fit: cover; width: 100%; }
.service-card-body { padding: var(--space-6); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.service-icon { width: 48px; height: 48px; display: grid; place-items: center; border-radius: var(--radius-md); background: var(--color-primary-soft); color: var(--color-primary); margin-top: calc(-1 * var(--space-10)); position: relative; z-index: 2; border: 3px solid var(--color-surface); }
.service-card h3 { font-size: var(--text-lg); }
.service-card p { font-size: var(--text-sm); color: var(--color-text-muted); flex: 1; }
.service-link { display:inline-flex; align-items:center; gap: var(--space-2); font-size: var(--text-sm); font-weight: 700; color: var(--color-primary); margin-top: var(--space-2); }
.service-link svg { transition: transform var(--transition); }
.service-card:hover .service-link svg { transform: translateX(4px); }

@media (max-width: 900px) { .services-grid { grid-template-columns: 1fr; } }

/* ---------- Alt section ---------- */
.alt { background: var(--color-surface-2); }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(var(--space-8), 5vw, var(--space-20)); align-items: center; }
.split img { border-radius: var(--radius-xl); box-shadow: var(--shadow-md); aspect-ratio: 4/3; object-fit: cover; width: 100%; }
.split.reverse .split-media { order: 2; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } .split.reverse .split-media { order: -1; } }

.check-list { display: grid; gap: var(--space-3); margin-top: var(--space-6); }
.check-list li { display: flex; align-items: flex-start; gap: var(--space-3); font-size: var(--text-base); }
.check-list svg { color: var(--color-accent); flex-shrink: 0; margin-top: 3px; }

/* ---------- Stats ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }
.stat { text-align: center; padding: var(--space-6); }
.stat .num { font-family: var(--font-display); font-size: var(--text-2xl); color: var(--color-primary); font-weight: 700; line-height: 1; }
.stat .label { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-2); }
@media (max-width: 640px) { .stats { grid-template-columns: repeat(2, 1fr); } }

/* ---------- Process ---------- */
.process-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); counter-reset: step; }
.process-step { position: relative; padding: var(--space-6); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); }
.process-step .step-num { font-family: var(--font-display); font-size: var(--text-lg); font-weight: 700; color: var(--color-primary); background: var(--color-primary-soft); width: 44px; height: 44px; display: grid; place-items: center; border-radius: var(--radius-full); margin-bottom: var(--space-4); }
.process-step h3 { font-size: var(--text-base); margin-bottom: var(--space-2); }
.process-step p { font-size: var(--text-sm); color: var(--color-text-muted); }
@media (max-width: 860px) { .process-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .process-grid { grid-template-columns: 1fr; } }

/* ---------- Areas ---------- */
.areas-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: var(--space-3); margin-top: var(--space-8); }
.area-chip { display:flex; align-items:center; gap: var(--space-2); padding: var(--space-3) var(--space-4); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); font-size: var(--text-sm); font-weight: 600; }
.area-chip svg { color: var(--color-primary); flex-shrink: 0; }

/* ---------- FAQ ---------- */
.faq-list { display: grid; gap: var(--space-3); }
.faq-item { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; }
.faq-item summary { padding: var(--space-5) var(--space-6); font-family: var(--font-display); font-weight: 700; font-size: var(--text-base); cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.5rem; color: var(--color-primary); transition: transform var(--transition); font-family: var(--font-body); }
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item .faq-body { padding: 0 var(--space-6) var(--space-5); color: var(--color-text-muted); font-size: var(--text-sm); }

/* ---------- CTA banner ---------- */
.cta-banner { background: linear-gradient(135deg, var(--color-primary), var(--color-blue)); color: #fff; border-radius: var(--radius-xl); padding: clamp(var(--space-10), 6vw, var(--space-20)); text-align: center; }
.cta-banner h2 { font-size: var(--text-xl); color: #fff; margin-bottom: var(--space-4); }
.cta-banner p { color: rgba(255,255,255,0.9); max-width: 52ch; margin: 0 auto var(--space-8); }
.cta-banner .btn-group { display: flex; flex-wrap: wrap; gap: var(--space-4); justify-content: center; }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(var(--space-8), 5vw, var(--space-16)); align-items: start; }
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-card { display: flex; gap: var(--space-4); padding: var(--space-5); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); margin-bottom: var(--space-4); }
.contact-card .ic { width: 46px; height: 46px; flex-shrink:0; display:grid; place-items:center; border-radius: var(--radius-md); background: var(--color-primary-soft); color: var(--color-primary); }
.contact-card strong { display:block; font-family: var(--font-display); }
.contact-card a, .contact-card span { color: var(--color-text-muted); font-size: var(--text-sm); }
.contact-card a:hover { color: var(--color-primary); }
.form { display: grid; gap: var(--space-4); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-xl); padding: clamp(var(--space-6), 4vw, var(--space-10)); }
.field { display: grid; gap: var(--space-2); }
.field label { font-size: var(--text-sm); font-weight: 600; }
.field input, .field select, .field textarea {
  padding: var(--space-3) var(--space-4); border: 1px solid var(--color-border); border-radius: var(--radius-md);
  background: var(--color-bg); font-size: var(--text-sm);
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px var(--color-primary-soft); }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
@media (max-width: 520px) { .field-row { grid-template-columns: 1fr; } }
.form-note { font-size: var(--text-xs); color: var(--color-text-faint); }

/* ---------- Page hero (interior) ---------- */
.page-hero { background: var(--color-surface-2); border-bottom: 1px solid var(--color-divider); padding-block: clamp(var(--space-12), 7vw, var(--space-24)); }
.page-hero h1 { font-size: var(--text-2xl); margin-block: var(--space-3) var(--space-4); max-width: 18ch; }
.page-hero p { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 56ch; }
.breadcrumb { font-size: var(--text-xs); color: var(--color-text-muted); display:flex; gap: var(--space-2); align-items:center; }
.breadcrumb a:hover { color: var(--color-primary); }

/* ---------- Prose ---------- */
.prose h2 { font-size: var(--text-xl); margin-block: var(--space-10) var(--space-4); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: var(--text-lg); margin-block: var(--space-6) var(--space-3); }
.prose p { margin-bottom: var(--space-4); color: var(--color-text-muted); max-width: 70ch; }
.prose ul { margin: 0 0 var(--space-4) var(--space-5); color: var(--color-text-muted); display: grid; gap: var(--space-2); }
.prose strong { color: var(--color-text); }

/* ---------- Footer ---------- */
.footer { background: var(--color-surface); border-top: 1px solid var(--color-divider); padding-block: var(--space-16) var(--space-8); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: var(--space-8); margin-bottom: var(--space-12); }
.footer h4 { font-family: var(--font-display); font-size: var(--text-sm); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: var(--space-4); color: var(--color-text); }
.footer ul { display: grid; gap: var(--space-2); }
.footer a { font-size: var(--text-sm); color: var(--color-text-muted); }
.footer a:hover { color: var(--color-primary); }
.footer-about p { font-size: var(--text-sm); color: var(--color-text-muted); margin-block: var(--space-4); max-width: 34ch; }
.footer-slogan { font-family: var(--font-display); font-weight: 600; font-size: var(--text-base) !important; color: var(--color-primary) !important; margin-top: var(--space-3) !important; margin-bottom: 0 !important; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--space-4); padding-top: var(--space-6); border-top: 1px solid var(--color-divider); font-size: var(--text-xs); color: var(--color-text-faint); }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.16,1,0.3,1); }
.reveal.in { opacity: 1; transform: none; }