/* =========================================================
   ATPEAK — BRAND IDENTITY & PACKAGING SYSTEM
   Hydrate. Optimize. Peak.
   ========================================================= */

:root {
  --peak-black: #0A0A0A;
  --carbon-gray: #1A1A1A;
  --carbon-gray-2: #141414;
  --molecule-silver: #D9D9D9;
  --silver-dim: #8a8a8a;
  --pure-white: #FFFFFF;
  --hairline: rgba(255, 255, 255, 0.08);
  --hairline-strong: rgba(255, 255, 255, 0.18);

  --font-display: 'Bebas Neue', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;

  --maxw: 1280px;
  --gutter: clamp(20px, 4vw, 48px);

  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--peak-black);
  color: var(--pure-white);
  font-family: var(--font-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: 0.01em;
  line-height: 1.55;
  scroll-behavior: smooth;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* Display type */
.display, h1, h2, h3, .nav-logo-text {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 0.95;
  text-transform: uppercase;
  margin: 0;
}

h1 { font-size: clamp(48px, 8vw, 120px); }
h2 { font-size: clamp(36px, 5vw, 72px); }
h3 { font-size: clamp(22px, 2.5vw, 32px); }

p { margin: 0 0 1em; }

.eyebrow {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--molecule-silver);
  display: inline-block;
}

.divider {
  width: 64px;
  height: 1px;
  background: var(--molecule-silver);
  margin: 24px 0;
}

/* Layout */
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

section {
  padding: clamp(72px, 10vw, 140px) 0;
  position: relative;
}

.section-head {
  max-width: 720px;
  margin-bottom: 56px;
}

.grid-2 { display: grid; gap: 48px; grid-template-columns: 1fr 1fr; align-items: center; }
.grid-3 { display: grid; gap: 24px; grid-template-columns: repeat(3, 1fr); }
.grid-4 { display: grid; gap: 24px; grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* =========================================================
   NAV
   ========================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10,10,10,0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--hairline);
}

.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-logo svg { width: 28px; height: 28px; }

.nav-logo-text {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.18em;
  color: var(--pure-white);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--molecule-silver);
  transition: color 0.2s var(--ease);
}

.nav-links a:hover, .nav-links a.active { color: var(--pure-white); }

.nav-cta {
  display: flex;
  align-items: center;
  gap: 14px;
}

.cart-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--pure-white);
  cursor: pointer;
  transition: border-color 0.2s var(--ease);
}
.cart-pill:hover { border-color: var(--pure-white); }

@media (max-width: 800px) {
  .nav-links { display: none; }
}

/* =========================================================
   BUTTONS
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 28px;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 0;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.btn-primary {
  background: var(--pure-white);
  color: var(--peak-black);
}
.btn-primary:hover {
  background: var(--molecule-silver);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--pure-white);
  border-color: var(--hairline-strong);
}
.btn-ghost:hover {
  border-color: var(--pure-white);
}

.btn-arrow::after {
  content: "→";
  font-size: 14px;
  transition: transform 0.2s var(--ease);
}
.btn-arrow:hover::after { transform: translateX(4px); }

/* =========================================================
   HERO (photo-driven)
   ========================================================= */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 80px 0 60px;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 560px at 80% 50%, rgba(255,255,255,0.06), transparent 70%),
    radial-gradient(620px 420px at 18% 30%, rgba(217,217,217,0.04), transparent 70%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 64px;
  align-items: center;
  position: relative;
  z-index: 1;
}

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

.hero h1 {
  font-size: clamp(56px, 9vw, 132px);
  margin-bottom: 24px;
}

.hero h1 .accent {
  color: var(--molecule-silver);
}

.hero-sub {
  max-width: 460px;
  color: var(--molecule-silver);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 36px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Photo stage — hero & product */
.photo-stage {
  position: relative;
  aspect-ratio: 4/5;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--carbon-gray-2);
}
.photo-stage img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.8s var(--ease);
}
.photo-stage:hover img { transform: scale(1.03); }

.photo-stage--square { aspect-ratio: 1/1; }
.photo-stage--portrait { aspect-ratio: 3/4; }
.photo-stage--wide { aspect-ratio: 16/10; }

/* =========================================================
   STAT / VALUE STRIP
   ========================================================= */
.value-strip {
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  padding: 28px 0;
  background: var(--carbon-gray-2);
}

.value-strip-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.value-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--molecule-silver);
}

.value-item svg { width: 22px; height: 22px; flex-shrink: 0; }

/* =========================================================
   FEATURE CARDS
   ========================================================= */
.feature-card {
  padding: 36px;
  border: 1px solid var(--hairline);
  background: var(--carbon-gray);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.feature-card:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
}

.feature-card .icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--hairline-strong);
  border-radius: 50%;
  margin-bottom: 24px;
}

.feature-card h3 {
  font-size: 18px;
  letter-spacing: 0.18em;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--molecule-silver);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

/* =========================================================
   PRODUCT CARDS (single SKU)
   ========================================================= */
.product-card {
  background: var(--carbon-gray);
  border: 1px solid var(--hairline);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.product-card:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-3px);
}

.product-stage {
  aspect-ratio: 1/1;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--hairline);
  background: var(--carbon-gray-2);
}

.product-stage img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.8s var(--ease);
}

.product-card:hover .product-stage img { transform: scale(1.04); }

.product-info {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.product-name {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.product-meta {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--silver-dim);
}

.product-price {
  font-family: var(--font-display);
  font-size: 32px;
  letter-spacing: 0.06em;
  margin-top: 4px;
}

.product-card .btn {
  margin-top: 12px;
  justify-content: center;
}

/* Tag */
.tag {
  position: absolute;
  top: 14px;
  left: 14px;
  font-size: 10px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--peak-black);
  background: var(--pure-white);
  padding: 6px 10px;
  z-index: 2;
}

/* Single-product layout */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: stretch;
}
@media (max-width: 900px) { .product-detail { grid-template-columns: 1fr; gap: 32px; } }

.product-detail .product-stage {
  aspect-ratio: 4/5;
  border: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}

.product-detail .product-info {
  padding: 0;
  background: transparent;
  align-self: center;
  gap: 14px;
}

.product-detail .product-name { font-size: clamp(48px, 6vw, 80px); }
.product-detail .product-price { font-size: clamp(40px, 5vw, 56px); }

.spec-list {
  list-style: none;
  margin: 16px 0 24px;
  padding: 0;
  border-top: 1px solid var(--hairline);
}
.spec-list li {
  display: flex;
  justify-content: space-between;
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.spec-list li span:first-child { color: var(--silver-dim); }
.spec-list li span:last-child { color: var(--pure-white); font-weight: 600; }

/* =========================================================
   SCIENCE / SPLIT
   ========================================================= */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: 48px; } }

.molecule-mark {
  width: 100%;
  max-width: 460px;
  margin: 0 auto;
  aspect-ratio: 1;
  position: relative;
}

/* =========================================================
   QUOTE BAND
   ========================================================= */
.quote-band {
  background: var(--carbon-gray-2);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  text-align: center;
}

.quote-band h2 {
  font-size: clamp(36px, 6vw, 84px);
  max-width: 900px;
  margin: 0 auto;
}

.quote-band p {
  color: var(--molecule-silver);
  margin-top: 24px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

/* =========================================================
   STAT HERO BLOCK (research headline number)
   ========================================================= */
.stat-hero {
  text-align: center;
  padding: clamp(80px, 10vw, 140px) 0;
  background:
    radial-gradient(900px 500px at 50% 50%, rgba(255,255,255,0.06), transparent 70%),
    var(--peak-black);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
}
.stat-hero .stat-number {
  font-family: var(--font-display);
  font-size: clamp(140px, 22vw, 320px);
  line-height: 0.85;
  letter-spacing: 0.02em;
  margin: 24px 0;
  background: linear-gradient(180deg, #ffffff 0%, #cfcfcf 60%, #7a7a7a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-hero .stat-caption {
  font-size: 14px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--molecule-silver);
  max-width: 720px;
  margin: 0 auto;
}

/* =========================================================
   RESEARCH / STUDY CARDS
   ========================================================= */
.study-card {
  position: relative;
  padding: 40px 36px 36px;
  border: 1px solid var(--hairline);
  background: var(--carbon-gray);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.study-card:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
}
.study-card .study-school {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.22em;
}
.study-card .study-stat {
  font-family: var(--font-display);
  font-size: clamp(48px, 5vw, 64px);
  line-height: 1;
  letter-spacing: 0.02em;
  margin: 8px 0 4px;
  color: var(--pure-white);
}
.study-card blockquote {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--molecule-silver);
  font-style: italic;
  border-left: 2px solid var(--molecule-silver);
  padding-left: 16px;
}
.study-card .study-credit {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--silver-dim);
  margin-top: auto;
  padding-top: 8px;
}

/* =========================================================
   LIFESTYLE TILES (photo-backed)
   ========================================================= */
.lifestyle-tile {
  position: relative;
  aspect-ratio: 1/1;
  overflow: hidden;
  border: 1px solid var(--hairline);
}
.lifestyle-tile img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 1s var(--ease);
}
.lifestyle-tile:hover img { transform: scale(1.05); }
.lifestyle-tile::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 30%, rgba(0,0,0,0.85) 100%);
}
.lifestyle-tile .tile-text {
  position: absolute;
  inset: auto 0 0 0;
  padding: 24px 28px;
  z-index: 2;
}
.lifestyle-tile .eyebrow { color: var(--molecule-silver); }
.lifestyle-tile h3 {
  font-size: 24px;
  letter-spacing: 0.16em;
  margin-top: 8px;
}

/* =========================================================
   CTA BAND
   ========================================================= */
.cta-band {
  background:
    linear-gradient(180deg, rgba(0,0,0,0) 0%, rgba(0,0,0,0.6) 100%),
    radial-gradient(ellipse at 50% 50%, #1f1f1f 0%, #0a0a0a 70%);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  text-align: center;
}

.cta-band h2 { margin-bottom: 24px; }
.cta-band p { color: var(--molecule-silver); margin-bottom: 32px; }

/* =========================================================
   FOOTER
   ========================================================= */
.footer {
  background: var(--peak-black);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 32px;
  color: var(--silver-dim);
  font-size: 13px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 500px) { .footer-grid { grid-template-columns: 1fr; } }

.footer h4 {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.22em;
  color: var(--pure-white);
  margin: 0 0 16px;
}

.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 10px; }
.footer a { color: var(--molecule-silver); transition: color 0.2s var(--ease); }
.footer a:hover { color: var(--pure-white); }

.footer-base {
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.social-row { display: flex; gap: 14px; }
.social-row a {
  width: 36px;
  height: 36px;
  border: 1px solid var(--hairline-strong);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.social-row a:hover {
  border-color: var(--pure-white);
  background: var(--pure-white);
  color: var(--peak-black);
}
.social-row svg { width: 16px; height: 16px; }

/* =========================================================
   FORM
   ========================================================= */
.form-card {
  background: var(--carbon-gray);
  border: 1px solid var(--hairline);
  padding: 40px;
}

.field {
  display: flex;
  flex-direction: column;
  margin-bottom: 20px;
}

.field label {
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--molecule-silver);
  margin-bottom: 8px;
}

.field input, .field textarea, .field select {
  background: var(--peak-black);
  border: 1px solid var(--hairline-strong);
  padding: 14px 16px;
  color: var(--pure-white);
  font-family: var(--font-body);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s var(--ease);
}

.field input:focus, .field textarea:focus, .field select:focus {
  border-color: var(--pure-white);
}

.field textarea { min-height: 140px; resize: vertical; }

/* =========================================================
   PAGE HERO (for non-home pages)
   ========================================================= */
.page-hero {
  padding: clamp(80px, 12vw, 160px) 0 clamp(48px, 6vw, 80px);
  border-bottom: 1px solid var(--hairline);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(800px 400px at 80% 50%, rgba(255,255,255,0.05), transparent 70%);
  pointer-events: none;
}

.page-hero .container { position: relative; z-index: 1; }
.page-hero h1 { font-size: clamp(48px, 7vw, 96px); margin-bottom: 16px; }
.page-hero p { max-width: 580px; color: var(--molecule-silver); }

/* =========================================================
   SCIENCE PAGE BLOCKS
   ========================================================= */
.spec-row {
  display: grid;
  grid-template-columns: 200px 1fr 1fr;
  gap: 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--hairline);
  align-items: baseline;
}
.spec-row:last-child { border-bottom: 0; }
.spec-row .label {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.18em;
}
.spec-row .value {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: 0.04em;
}
.spec-row .desc { color: var(--molecule-silver); font-size: 14px; }
@media (max-width: 700px) {
  .spec-row { grid-template-columns: 1fr; gap: 8px; }
}

/* =========================================================
   ABOUT PAGE
   ========================================================= */
.pillar {
  border: 1px solid var(--hairline);
  padding: 28px;
  background: var(--carbon-gray);
}

.pillar h3 {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.2em;
  margin-bottom: 12px;
}

.pillar p { color: var(--molecule-silver); font-size: 14px; margin: 0; }

/* =========================================================
   UTILITY
   ========================================================= */
.center { text-align: center; }
.muted { color: var(--molecule-silver); }
.mt-1 { margin-top: 16px; } .mt-2 { margin-top: 32px; } .mt-3 { margin-top: 48px; }
.mb-1 { margin-bottom: 16px; } .mb-2 { margin-bottom: 32px; } .mb-3 { margin-bottom: 48px; }

/* =========================================================
   ANIMATIONS
   ========================================================= */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.float { animation: float 6s ease-in-out infinite; }

@keyframes spin-slow {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

.spin-slow { animation: spin-slow 40s linear infinite; }

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fade-in 0.8s var(--ease) forwards;
}
@keyframes fade-in { to { opacity: 1; transform: translateY(0); } }