/* ==========================================================================
   PITH — Shared Design System
   "Warm Editorial Minimalism"

   Shared tokens, reset, nav, footer, buttons, sections, reveal animations.
   Loaded by all light-theme pages (landing, tour, quiz, PDPs, protocol).
   ========================================================================== */

/* ---------- DESIGN TOKENS ---------- */
:root {
  /* Color Palette — Warm Earth (Light Theme) */
  --color-bg-primary: #FAFAF7;
  --color-bg-warm: #F0EBE1;
  --color-bg-dark: #1A1A1E;
  --color-bg-dark-alt: #232328;
  --color-bg-card: #FFFFFF;

  --color-accent: #B85C38;
  --color-accent-hover: #A34E2E;
  --color-accent-light: rgba(184, 92, 56, 0.08);
  --color-accent-glow: rgba(184, 92, 56, 0.25);
  --color-green: #2B4C3F;
  --color-green-light: #3D6B5E;
  --color-gold: #C49B5C;
  --color-gold-muted: rgba(196, 155, 92, 0.15);

  --color-text: #1A1A1E;
  --color-text-secondary: #6B6862;
  --color-text-muted: #9B9790;
  --color-text-on-dark: #F0EBE1;
  --color-text-on-dark-secondary: rgba(240, 235, 225, 0.65);

  --color-border: rgba(26, 26, 30, 0.08);
  --color-border-dark: rgba(240, 235, 225, 0.12);

  /* Product Colors */
  --color-creatine: #5A9A7A;
  --color-energy: #B85C38;
  --color-ashwagandha: #7B68AE;
  --color-magnesium: #4A8DB7;

  /* Typography */
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'Source Serif 4', 'Source Serif Pro', Georgia, serif;
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Type Scale */
  --text-hero: clamp(3.5rem, 8vw, 7rem);
  --text-display: clamp(2.5rem, 5vw, 4.5rem);
  --text-h1: clamp(2rem, 4vw, 3.5rem);
  --text-h2: clamp(1.75rem, 3vw, 2.5rem);
  --text-h3: clamp(1.25rem, 2vw, 1.75rem);
  --text-body-lg: clamp(1.125rem, 1.5vw, 1.375rem);
  --text-body: 1.0625rem;
  --text-small: 0.875rem;
  --text-xs: 0.75rem;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 5rem;
  --space-3xl: 8rem;
  --space-4xl: 12rem;

  --section-gap: clamp(6rem, 12vw, 12rem);

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --max-width-text: 640px;
  --gutter: clamp(1.5rem, 4vw, 3rem);

  /* Effects */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.08);

  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 700ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- RESET & BASE ---------- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* ---------- TYPOGRAPHY ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.text-hero {
  font-size: var(--text-hero);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 400;
}

.text-display {
  font-size: var(--text-display);
  line-height: 1.1;
}

.text-h1 { font-size: var(--text-h1); }
.text-h2 { font-size: var(--text-h2); }
.text-h3 { font-size: var(--text-h3); }

.text-body-lg {
  font-size: var(--text-body-lg);
  line-height: 1.7;
}

.text-small { font-size: var(--text-small); }

.text-xs {
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: var(--font-ui);
  font-weight: 500;
}

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

.font-ui { font-family: var(--font-ui); }
.font-serif { font-family: var(--font-display); }

.italic { font-style: italic; }

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

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--text {
  max-width: var(--max-width-text);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- BUTTONS ---------- */
.btn {
  font-family: var(--font-ui);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  cursor: pointer;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  padding: 0.875rem 2rem;
  font-size: var(--text-body);
  border: none;
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 0 24px var(--color-accent-glow);
}

.btn--outline {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.75rem 1.5rem;
  font-size: var(--text-small);
}

.btn--outline:hover {
  border-color: var(--color-text-secondary);
  background: var(--color-accent-light);
}

.btn--secondary {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.75rem 1.5rem;
  font-size: var(--text-small);
}

.btn--secondary:hover {
  border-color: var(--color-text-secondary);
  background: var(--color-accent-light);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  font-family: var(--font-ui);
  font-size: var(--text-small);
  padding: 0.5rem 1rem;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.btn--ghost:hover {
  color: var(--color-text-secondary);
}

.btn--lg {
  padding: 1rem 2.5rem;
  font-size: 1.0625rem;
}

.btn__arrow {
  transition: transform var(--transition-fast);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* ---------- NAVIGATION ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  transition: var(--transition-normal);
  mix-blend-mode: difference;
}

.nav--scrolled {
  mix-blend-mode: normal;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}

/* For pages that always have a solid nav (no dark hero) */
.nav--solid {
  mix-blend-mode: normal;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
}

.nav--solid .nav__logo { color: var(--color-text); }
.nav--solid .nav__links a { color: var(--color-text-secondary); }
.nav--solid .nav__links a:hover { color: var(--color-text); }
.nav--solid .nav__cta {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.nav--solid .nav__cta:hover {
  background: var(--color-accent-hover);
}
.nav--solid .nav__hamburger span { background: var(--color-text); }

/* Active nav link */
.nav__links a.nav__link--active {
  color: var(--color-accent);
}
.nav--scrolled .nav__links a.nav__link--active,
.nav--solid .nav__links a.nav__link--active {
  color: var(--color-accent);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-ui);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  transition: var(--transition-fast);
}

.nav__logo svg {
  width: auto;
  height: 28px;
  flex-shrink: 0;
}

/* Nav mark color control — overrides fill="currentColor" in SVG HTML */
.nav .nav__logo svg path {
  fill: #fff; /* White for mix-blend-mode: difference over dark hero */
  transition: fill 150ms ease;
}

.nav--scrolled .nav__logo {
  color: var(--color-text);
}

/* Rust mark when nav is on a solid/scrolled background */
.nav--scrolled .nav__logo svg path,
.nav--solid .nav__logo svg path {
  fill: var(--color-accent);
}

.nav__links {
  display: none;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

.nav__links a {
  font-family: var(--font-ui);
  font-size: var(--text-small);
  font-weight: 500;
  color: rgba(255,255,255,0.8);
  transition: var(--transition-fast);
  letter-spacing: 0.01em;
}

.nav--scrolled .nav__links a {
  color: var(--color-text-secondary);
}

.nav__links a:hover {
  color: #fff;
}

.nav--scrolled .nav__links a:hover {
  color: var(--color-text);
}

.nav__link--highlight {
  color: var(--color-gold) !important;
}

.nav__cta {
  font-family: var(--font-ui);
  font-size: var(--text-small);
  font-weight: 600;
  padding: 0.625rem 1.5rem;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.2);
  transition: var(--transition-fast);
  text-decoration: none;
}

.nav--scrolled .nav__cta {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.nav__cta:hover {
  background: rgba(255,255,255,0.25);
}

.nav--scrolled .nav__cta:hover {
  background: var(--color-accent-hover);
}

/* Hamburger — mobile */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  cursor: pointer;
  z-index: 110;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: #fff;
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav--scrolled .nav__hamburger span {
  background: var(--color-text);
}

.nav__hamburger[aria-expanded="true"] span {
  background: var(--color-text);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu */
.nav__mobile {
  display: none;
  flex-direction: column;
  padding: var(--space-md) var(--gutter) var(--space-lg);
  background: rgba(250, 250, 247, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-border);
}

.nav__mobile a {
  font-family: var(--font-ui);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
  transition: color var(--transition-fast);
}

.nav__mobile a:last-child {
  border-bottom: none;
}

.nav__mobile a:hover {
  color: var(--color-text);
}

.nav__mobile--open {
  display: flex;
}

.nav:has(.nav__mobile--open) {
  mix-blend-mode: normal;
  background: rgba(250, 250, 247, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

@media (max-width: 767px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__cta {
    display: none;
  }
}

/* ---------- SECTIONS ---------- */
section {
  padding: var(--section-gap) 0;
}

.section__header {
  margin-bottom: var(--space-2xl);
}

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

.section__eyebrow {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.section__title {
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--text-body-lg);
  color: var(--color-text-secondary);
  max-width: var(--max-width-text);
  line-height: 1.7;
}

.section__header--centered .section__subtitle {
  margin: 0 auto;
}

/* Dark sections */
.section--dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-on-dark);
}

.section--dark .section__eyebrow {
  color: var(--color-gold);
}

.section--dark .section__subtitle {
  color: var(--color-text-on-dark-secondary);
}

/* Warm sections */
.section--warm {
  background-color: var(--color-bg-warm);
}

/* Section rules */
.section-rule {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0;
}

/* Divider */
.divider {
  width: 60px;
  height: 1px;
  background: var(--color-accent);
  margin: var(--space-xl) 0;
}

.divider--center {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- SCROLL REVEAL ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 150ms; }
.reveal--delay-2 { transition-delay: 300ms; }
.reveal--delay-3 { transition-delay: 450ms; }

/* ---------- FOOTER ---------- */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  padding: var(--space-2xl) 0 var(--space-xl);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-2xl);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer__brand p {
  font-size: var(--text-small);
  color: var(--color-text-on-dark-secondary);
  max-width: 320px;
  margin-top: var(--space-sm);
  line-height: 1.6;
}

.footer__heading {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-on-dark-secondary);
  margin-bottom: var(--space-md);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links a {
  font-family: var(--font-ui);
  font-size: var(--text-small);
  color: var(--color-text-on-dark-secondary);
  transition: color var(--transition-fast);
}

.footer__links a:hover {
  color: var(--color-text-on-dark);
}

.footer__bottom {
  border-top: 1px solid var(--color-border-dark);
  padding-top: var(--space-lg);
}

.footer__disclaimer {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-on-dark-secondary);
  opacity: 0.7;
  line-height: 1.6;
  margin-bottom: var(--space-md);
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
}

.footer__legal {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-on-dark-secondary);
  opacity: 0.5;
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
}

/* ---------- FORMS ---------- */
.waitlist-form__fields {
  display: flex;
  gap: var(--space-sm);
}

.waitlist-form__input {
  flex: 1;
  padding: 0.875rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg-card);
  color: var(--color-text);
  font-family: var(--font-ui);
  font-size: var(--text-body);
  outline: none;
  transition: border-color var(--transition-fast);
}

.waitlist-form__input:focus {
  border-color: var(--color-accent);
}

.waitlist-form__input::placeholder {
  color: var(--color-text-muted);
}

.waitlist-form__note {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-sm);
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
}

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

.waitlist-form__success-icon {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent-light);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin: 0 auto var(--space-md);
}

.waitlist-form__success-title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  margin-bottom: var(--space-xs);
}

.waitlist-form__success-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
}

/* Feedback form */
.feedback-form__label {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--text-small);
  font-weight: 500;
  margin-bottom: var(--space-sm);
}

.feedback-form__textarea {
  width: 100%;
  padding: var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  color: var(--color-text);
  font-family: var(--font-ui);
  font-size: var(--text-small);
  resize: vertical;
  outline: none;
  transition: border-color var(--transition-fast);
  margin-bottom: var(--space-sm);
}

.feedback-form__textarea:focus {
  border-color: var(--color-accent);
}

.feedback-form__textarea::placeholder {
  color: var(--color-text-muted);
}

.feedback-form__row {
  display: flex;
  gap: var(--space-sm);
  align-items: center;
}

.feedback-form__email {
  flex: 1;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg-card);
  color: var(--color-text);
  font-family: var(--font-ui);
  font-size: var(--text-small);
  outline: none;
  transition: border-color var(--transition-fast);
}

.feedback-form__email:focus {
  border-color: var(--color-accent);
}

.feedback-form__email::placeholder {
  color: var(--color-text-muted);
}

.feedback-form__success p {
  font-family: var(--font-ui);
  font-size: var(--text-body);
  color: var(--color-accent);
}

/* ---------- RESPONSIVE FORM TWEAKS ---------- */
@media (max-width: 480px) {
  .waitlist-form__fields {
    flex-direction: column;
  }

  .feedback-form__row {
    flex-direction: column;
    align-items: stretch;
  }
}

/* ---------- ANNOUNCEMENT BAR ---------- */
.announcement {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  background: var(--color-bg-warm);
  color: var(--color-text);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid rgba(184, 92, 56, 0.2);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.announcement--hidden {
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
}

.announcement__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.announcement__text {
  font-family: var(--font-ui);
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.announcement__badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: #fff;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.announcement__close {
  color: var(--color-text-muted);
  font-size: 1.25rem;
  padding: var(--space-xs);
  line-height: 1;
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

.announcement__close:hover {
  color: var(--color-text);
}

body:has(.announcement:not(.announcement--hidden)) .nav {
  top: 0;
  transform: translateY(var(--announcement-height, 40px));
}

body:has(.announcement.announcement--hidden) .nav {
  transform: translateY(0);
}

/* ---------- FDA DISCLAIMER ---------- */
.fda-disclaimer {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.5;
  opacity: 0.6;
  padding: var(--space-lg) var(--gutter);
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
}