/* =============================================
   Tank Logic — home.css  v5  NATURE THEME
   Premium freshwater ecosystem homepage
   ============================================= */

.nav__logo-mark { flex-shrink: 0; }

/* ── HERO ─────────────────────────────────────── */
.home-hero {
  position: relative;
  padding-top: calc(var(--nav-h) + 96px);
  padding-bottom: 104px;
  overflow: hidden;
}
.home-hero__bg { position: absolute; inset: 0; pointer-events: none; }
.home-hero__glow--1 {
  position: absolute; width: 800px; height: 600px; top: -200px; left: -100px;
  background: radial-gradient(ellipse, rgba(122,182,72,0.13) 0%, rgba(45,122,58,0.05) 45%, transparent 70%);
  filter: blur(80px); border-radius: 50%;
}
.home-hero__glow--2 {
  position: absolute; width: 600px; height: 500px; bottom: -100px; right: -80px;
  background: radial-gradient(ellipse, rgba(42,127,168,0.1) 0%, transparent 65%);
  filter: blur(80px); border-radius: 50%;
}
.home-hero__grid {
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(178deg, transparent, transparent 44px, rgba(45,122,58,0.03) 44px, rgba(45,122,58,0.03) 45px);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black, transparent);
}
.home-hero__inner { position: relative; z-index: 1; max-width: 700px; }

.home-hero__pill {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: var(--sz-12); font-weight: 500; color: var(--tx-lo);
  background: var(--bg-1); border: 1px solid var(--border-mid);
  border-radius: 100px; padding: 6px 14px 6px 10px; margin-bottom: 30px;
  text-decoration: none; box-shadow: var(--shadow-sm);
  transition: border-color var(--t), color var(--t), box-shadow var(--t);
}
.home-hero__pill:hover { border-color: var(--border-hi); color: var(--tx); box-shadow: var(--shadow-md); }
.home-hero__pill-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 8px var(--accent);
  flex-shrink: 0; animation: pulse-dot 2.8s ease-in-out infinite;
}
.home-hero__pill-arrow { opacity: 0.5; font-size: var(--sz-11); }

.home-hero__h1 {
  font-family: var(--font-head);
  font-size: clamp(2.8rem, 7vw, 4.8rem);
  font-weight: 800; letter-spacing: -0.048em; line-height: 1.05;
  color: var(--tx-hi); margin-bottom: 24px;
}
.home-hero__gradient {
  background: linear-gradient(135deg, var(--accent) 0%, var(--leaf) 40%, var(--water) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.home-hero__sub { font-size: var(--sz-18); color: var(--tx-lo); line-height: 1.65; max-width: 500px; margin-bottom: 38px; }
.home-hero__ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 52px; }

.btn-hero-primary {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font); font-size: var(--sz-15); font-weight: 700;
  padding: 13px 24px; border-radius: var(--r-lg); border: none; cursor: pointer;
  text-decoration: none; background: var(--accent); color: #fff;
  box-shadow: 0 2px 12px rgba(45,122,58,0.3), 0 1px 3px rgba(45,122,58,0.2);
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), background var(--t);
}
.btn-hero-primary:hover { background: #256b31; transform: translateY(-2px); box-shadow: 0 6px 24px rgba(45,122,58,0.38); }

.btn-hero-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font); font-size: var(--sz-15); font-weight: 500;
  padding: 13px 22px; border-radius: var(--r-lg); border: 1px solid var(--border-mid);
  cursor: pointer; text-decoration: none; background: var(--bg-1); color: var(--tx);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--t), color var(--t), background var(--t), transform var(--t) var(--ease), box-shadow var(--t);
}
.btn-hero-secondary:hover { border-color: var(--border-hi); color: var(--tx-hi); background: var(--bg-2); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.home-hero__trust { display: flex; align-items: center; flex-wrap: wrap; gap: 0; padding-top: 36px; border-top: 1px solid var(--border); }
.home-hero__trust-item { display: flex; flex-direction: column; gap: 3px; padding-right: 32px; margin-right: 32px; }
.home-hero__trust-item:last-child { padding-right: 0; margin-right: 0; }
.home-hero__trust-sep { width: 1px; height: 30px; background: var(--border-mid); flex-shrink: 0; margin-right: 32px; }
.home-hero__trust-num { font-family: var(--font-head); font-size: var(--sz-24); font-weight: 800; color: var(--tx-hi); letter-spacing: -0.04em; line-height: 1; }
.home-hero__trust-label { font-size: var(--sz-12); color: var(--tx-xlo); font-weight: 500; }

/* ── SECTION HEADERS ─────────────────────────── */
.home-section-header { margin-bottom: 48px; }
.home-section-header--split { display: flex; align-items: flex-end; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.home-section-kicker { font-family: var(--font-head); font-size: var(--sz-11); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
.home-section-title { font-family: var(--font-head); font-size: clamp(1.7rem, 3.5vw, 2.6rem); font-weight: 800; letter-spacing: -0.038em; line-height: 1.12; color: var(--tx-hi); margin-bottom: 10px; }
.home-section-sub { font-size: var(--sz-15); color: var(--tx-lo); }

/* ── TOOLS ───────────────────────────────────── */
.home-tools { padding-block: 100px; border-top: 1px solid var(--border); position: relative; }
.home-tools::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 40% at 80% 20%, rgba(122,182,72,0.05) 0%, transparent 55%);
  pointer-events: none;
}
.home-tools-grid { display: grid; grid-template-columns: 1fr; gap: 12px; position: relative; }

.home-tool-card {
  display: block; background: var(--bg-1); border: 1px solid var(--border);
  border-radius: var(--r-xl); padding: 26px; text-decoration: none; color: inherit;
  position: relative; overflow: hidden; box-shadow: var(--shadow-sm);
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), box-shadow 180ms var(--ease);
}
.home-tool-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(45,122,58,0.2), transparent);
  opacity: 0; transition: opacity var(--t);

  pointer-events: none;
}
.home-tool-card:hover::before { opacity: 1; }
.home-tool-card:hover { border-color: var(--border-mid); transform: translateY(-3px); box-shadow: var(--shadow-lg); }

.home-tool-card__icon { width: 42px; height: 42px; border-radius: 11px; display: flex; align-items: center; justify-content: center; margin-bottom: 16px; transition: transform 200ms var(--ease); }
.home-tool-card:hover .home-tool-card__icon { transform: scale(1.06); }
.home-tool-card__icon--teal   { background: var(--accent-lo); color: var(--accent); }
.home-tool-card__icon--blue   { background: var(--water-lo);  color: var(--water);  }
.home-tool-card__icon--gold   { background: var(--gold-lo);   color: var(--gold);   }
.home-tool-card__icon--purple { background: var(--purple-lo); color: var(--purple); }

.home-tool-card__kicker { font-family: var(--font-head); font-size: var(--sz-10); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--tx-xlo); margin-bottom: 6px; }
.home-tool-card__title  { font-family: var(--font-head); font-size: var(--sz-17); font-weight: 700; color: var(--tx-hi); letter-spacing: -0.022em; line-height: 1.25; margin-bottom: 9px; }
.home-tool-card__desc   { font-size: var(--sz-13); color: var(--tx-lo); line-height: 1.62; margin-bottom: 20px; }
.home-tool-card__cta    { display: inline-flex; align-items: center; gap: 5px; font-size: var(--sz-13); font-weight: 600; color: var(--accent); transition: gap var(--t) var(--ease); }
.home-tool-card:hover .home-tool-card__cta { gap: 9px; }

.home-tool-card--featured { display: grid; grid-template-columns: 1fr; gap: 22px; background: linear-gradient(145deg, rgba(45,122,58,0.04) 0%, var(--bg-1) 60%); border-color: var(--accent-mid); }
.home-tool-card--featured:hover { border-color: var(--border-hi); box-shadow: 0 8px 36px rgba(45,122,58,0.14); }
.home-tool-card__content { display: flex; flex-direction: column; }
.home-tool-card__preview { display: none; }

.tool-preview { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 16px 18px; display: flex; flex-direction: column; gap: 9px; }
.tool-preview__row { display: flex; justify-content: space-between; align-items: center; font-size: var(--sz-12); color: var(--tx-lo); border-bottom: 1px solid var(--border); padding-bottom: 9px; }
.tool-preview__val { font-weight: 600; color: var(--tx); }
.tool-preview__result { display: flex; justify-content: space-between; align-items: baseline; padding-top: 4px; }
.tool-preview__result-label { font-family: var(--font-head); font-size: var(--sz-11); color: var(--tx-lo); text-transform: uppercase; letter-spacing: 0.07em; font-weight: 700; }
.tool-preview__result-val { font-family: var(--font-head); font-size: 1.7rem; font-weight: 800; color: var(--accent); letter-spacing: -0.04em; }
.tool-preview__result-val small { font-size: var(--sz-12); font-weight: 500; color: var(--tx-lo); margin-left: 4px; }

/* ── FEATURE STRIP ───────────────────────────── */
.home-feature-strip { border-top: 1px solid var(--border); padding-block: 64px; background: linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 100%); position: relative; overflow: hidden; }
.home-feature-strip::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 50% 80% at 100% 50%, rgba(42,127,168,0.05) 0%, transparent 60%); pointer-events: none; }

.home-feature-card {
  display: flex; flex-direction: column; gap: 36px;
  background: var(--bg-1); border: 1px solid var(--border-mid); border-radius: var(--r-2xl);
  padding: 40px; text-decoration: none; color: inherit; position: relative; overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: border-color 180ms, transform 180ms var(--ease), box-shadow 180ms;
}
.home-feature-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--accent), var(--leaf), var(--water)); 
  pointer-events: none;
}
.home-feature-card:hover { border-color: var(--border-hi); transform: translateY(-3px); box-shadow: var(--shadow-lg); }

.home-feature-card__left  { max-width: 540px; position: relative; z-index: 1; }
.home-feature-card__right { position: relative; z-index: 1; }
.home-feature-card__kicker { font-family: var(--font-head); font-size: var(--sz-11); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--water); margin-bottom: 14px; }
.home-feature-card__title { font-family: var(--font-head); font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -0.032em; line-height: 1.18; color: var(--tx-hi); margin-bottom: 16px; }
.home-feature-card__sub { font-size: var(--sz-15); color: var(--tx-lo); line-height: 1.7; margin-bottom: 26px; }
.home-feature-card__cta { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-head); font-size: var(--sz-14); font-weight: 700; color: var(--water); transition: gap var(--t) var(--ease); }
.home-feature-card:hover .home-feature-card__cta { gap: 12px; }

.home-feature-card__diagram { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; justify-content: center; }
.cycle-step { display: flex; flex-direction: column; align-items: center; gap: 7px; background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--r-lg); padding: 16px 20px; min-width: 85px; text-align: center; box-shadow: var(--shadow-sm); }
.cycle-step__icon  { font-size: 1.6rem; }
.cycle-step__label { font-family: var(--font-head); font-size: var(--sz-12); font-weight: 700; color: var(--tx-hi); }
.cycle-step__badge { font-family: var(--font-head); font-size: var(--sz-10); font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; border-radius: 100px; padding: 3px 9px; }
.cycle-step--1 .cycle-step__badge,
.cycle-step--2 .cycle-step__badge { background: rgba(201,64,64,0.1); color: var(--red); border: 1px solid rgba(201,64,64,0.2); }
.cycle-step--3 .cycle-step__badge { background: var(--accent-lo); color: var(--accent); border: 1px solid var(--accent-mid); }
.cycle-arrow { font-size: 1.3rem; color: var(--tx-xlo); }

/* ── GUIDES ──────────────────────────────────── */
.home-guides { padding-block: 100px; border-top: 1px solid var(--border); }
.home-guides-all { display: inline-flex; align-items: center; gap: 6px; font-size: var(--sz-13); font-weight: 600; color: var(--tx-lo); text-decoration: none; transition: color var(--t); white-space: nowrap; flex-shrink: 0; }
.home-guides-all:hover { color: var(--accent); }
.home-guides-layout { display: grid; grid-template-columns: 1fr; gap: 12px; margin-bottom: 12px; }

.home-guide-feature { display: flex; flex-direction: column; background: var(--bg-1); border: 1px solid var(--border); border-radius: var(--r-xl); padding: 30px; text-decoration: none; color: inherit; box-shadow: var(--shadow-sm); transition: border-color 180ms, transform 180ms var(--ease), box-shadow 180ms; }
.home-guide-feature:hover { border-color: var(--border-mid); transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.home-guide-feature__tag   { font-family: var(--font-head); font-size: var(--sz-10); font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--water); margin-bottom: 14px; }
.home-guide-feature__title { font-family: var(--font-head); font-size: clamp(1.3rem, 2.5vw, 1.75rem); font-weight: 800; letter-spacing: -0.032em; line-height: 1.2; color: var(--tx-hi); margin-bottom: 12px; }
.home-guide-feature__desc  { font-size: var(--sz-14); color: var(--tx-lo); line-height: 1.68; flex: 1; margin-bottom: 22px; }
.home-guide-feature__meta  { display: flex; align-items: center; justify-content: space-between; padding-top: 18px; border-top: 1px solid var(--border); }
.home-guide-feature__time  { font-size: var(--sz-12); color: var(--tx-xlo); font-weight: 500; }
.home-guide-feature__cta   { font-family: var(--font-head); font-size: var(--sz-13); font-weight: 700; color: var(--accent); }

.home-guides-stack { display: flex; flex-direction: column; gap: 8px; }
.home-guide-item { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; background: var(--bg-1); border: 1px solid var(--border); border-left: 3px solid transparent; border-radius: var(--r-lg); padding: 16px 18px; text-decoration: none; color: inherit; flex: 1; box-shadow: var(--shadow-sm); transition: border-color 160ms, border-left-color 160ms, transform 160ms var(--ease), box-shadow 160ms; }
.home-guide-item:hover { border-color: var(--border-mid); border-left-color: var(--accent); transform: translateX(3px); box-shadow: var(--shadow-md); }
.home-guide-item__body { flex: 1; min-width: 0; }
.home-guide-item__tag { font-family: var(--font-head); font-size: var(--sz-10); font-weight: 700; text-transform: uppercase; letter-spacing: 0.09em; color: var(--tx-xlo); margin-bottom: 5px; display: block; transition: color 160ms; }
.home-guide-item:hover .home-guide-item__tag { color: var(--accent); }
.home-guide-item__title { font-family: var(--font-head); font-size: var(--sz-14); font-weight: 700; color: var(--tx-hi); letter-spacing: -0.016em; line-height: 1.32; margin-bottom: 5px; }
.home-guide-item__desc  { font-size: var(--sz-12); color: var(--tx-lo); line-height: 1.55; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; }
.home-guide-item__time  { font-size: var(--sz-11); color: var(--tx-xlo); white-space: nowrap; font-weight: 500; flex-shrink: 0; padding-top: 2px; }

.home-guides-row { display: grid; grid-template-columns: 1fr; gap: 12px; }
.home-guide-card { display: flex; flex-direction: column; background: var(--bg-1); border: 1px solid var(--border); border-radius: var(--r-xl); padding: 24px; text-decoration: none; color: inherit; box-shadow: var(--shadow-sm); transition: border-color 180ms, transform 180ms var(--ease), box-shadow 180ms; }
.home-guide-card:hover { border-color: var(--border-mid); transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.home-guide-card__tag   { font-family: var(--font-head); font-size: var(--sz-10); font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: var(--tx-xlo); margin-bottom: 9px; display: block; transition: color 160ms; }
.home-guide-card:hover .home-guide-card__tag { color: var(--accent); }
.home-guide-card__title { font-family: var(--font-head); font-size: var(--sz-15); font-weight: 700; color: var(--tx-hi); letter-spacing: -0.018em; line-height: 1.28; margin-bottom: 9px; }
.home-guide-card__desc  { font-size: var(--sz-13); color: var(--tx-lo); line-height: 1.62; flex: 1; margin-bottom: 18px; }
.home-guide-card__cta   { font-family: var(--font-head); font-size: var(--sz-12); font-weight: 700; color: var(--accent); }
.home-guides-footer { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--border); display: flex; justify-content: center; }

/* ── ABOUT ───────────────────────────────────── */
.home-about { padding-block: 100px; border-top: 1px solid var(--border); background: linear-gradient(180deg, var(--bg-2) 0%, var(--bg) 100%); position: relative; }
.home-about::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 40% 60% at 0% 50%, rgba(45,122,58,0.05) 0%, transparent 55%); pointer-events: none; }
.home-about__inner { display: grid; grid-template-columns: 1fr; gap: 52px; align-items: start; position: relative; z-index: 1; }
.home-about__title { font-family: var(--font-head); font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 800; letter-spacing: -0.038em; line-height: 1.15; color: var(--tx-hi); margin-bottom: 18px; }
.home-about__p { font-size: var(--sz-15); color: var(--tx-lo); line-height: 1.75; margin-bottom: 14px; }
.home-about__link { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; text-decoration-color: var(--accent-mid); transition: text-decoration-color var(--t); }
.home-about__link:hover { text-decoration-color: var(--accent); }
.home-about__stats { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; background: var(--border); border: 1px solid var(--border); border-radius: var(--r-xl); overflow: hidden; box-shadow: var(--shadow-sm); }
.home-about__stat { background: var(--bg-1); padding: 24px 26px; display: flex; flex-direction: column; gap: 7px; transition: background 160ms; }
.home-about__stat:hover { background: var(--bg-2); }
.home-about__stat-num   { font-family: var(--font-head); font-size: 2.2rem; font-weight: 800; color: var(--accent); letter-spacing: -0.04em; line-height: 1; }
.home-about__stat-label { font-size: var(--sz-12); color: var(--tx-lo); line-height: 1.5; }

/* ── CTA ─────────────────────────────────────── */
.home-cta { padding-block: 100px; border-top: 1px solid var(--border); position: relative; overflow: hidden; }
.home-cta::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 60% 80% at 50% 100%, rgba(45,122,58,0.06) 0%, transparent 60%), radial-gradient(ellipse 40% 50% at 20% 0%, rgba(122,182,72,0.05) 0%, transparent 50%); pointer-events: none; }
.home-cta__inner { text-align: center; max-width: 580px; margin-inline: auto; position: relative; z-index: 1; }
.home-cta__title { font-family: var(--font-head); font-size: clamp(1.9rem, 4vw, 3rem); font-weight: 800; letter-spacing: -0.042em; line-height: 1.1; color: var(--tx-hi); margin-bottom: 18px; }
.home-cta__sub   { font-size: var(--sz-16); color: var(--tx-lo); line-height: 1.68; margin-bottom: 34px; }
.home-cta__btns  { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }

/* ── RESPONSIVE ──────────────────────────────── */
@media (min-width: 640px) {
  .home-tools-grid  { grid-template-columns: repeat(2, 1fr); }
  .home-guides-row  { grid-template-columns: repeat(2, 1fr); }
  .footer__cols     { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 860px) {
  .home-tools-grid          { grid-template-columns: repeat(3, 1fr); }
  .home-tool-card--featured { grid-template-columns: 1fr 240px; grid-column: 1 / -1; }
  .home-tool-card__preview  { display: block; }
  .home-guides-layout       { grid-template-columns: 1.15fr 1fr; }
  .home-guides-row          { grid-template-columns: repeat(3, 1fr); }
  .home-about__inner        { grid-template-columns: 1fr 1fr; }
  .home-feature-card        { flex-direction: row; align-items: center; }
  .footer__inner            { grid-template-columns: 1fr 2fr; gap: 56px; }
}
@media (min-width: 900px) {
  .home-tools-grid          { grid-template-columns: repeat(3, 1fr); }
  .home-tool-card--featured { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .home-hero { padding-top: calc(var(--nav-h) + 60px); padding-bottom: 72px; }
  .home-hero__h1 { font-size: 2.5rem; }
  .home-hero__trust-sep { display: none; }
  .home-hero__trust-item { padding-right: 0; margin-right: 0; }
  .home-tools, .home-feature-strip, .home-guides, .home-about, .home-cta { padding-block: 72px; }
  .home-about__stats { grid-template-columns: 1fr; }
  .home-section-header--split { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) {
  .home-hero__pill-dot { animation: none !important; }
  .home-tool-card, .home-guide-feature, .home-guide-item,
  .home-guide-card, .home-feature-card, .home-about__stat { transition: none !important; }
}