/* ============================================================
   SERENA — aserena.com
   quiet tools. nothing extra.
   ============================================================ */


/* ------------------------------------------------------------
   TOKENS
   ------------------------------------------------------------ */

:root {
  /* Palette */
  --color-bg:           #F9F6F2;   /* linen — page background */
  --color-surface:      #FDFBF8;   /* slightly lighter — cards */
  --color-border:       #E8E3DC;   /* warm stone — dividers, card borders */
  --color-border-light: #C4BDB0;   /* lighter — labels, section marks */

  --color-ink:          #1E2825;   /* near-black — headlines, wordmark */
  --color-body:         #8A9690;   /* muted sage — body text */
  --color-muted:        #A89E94;   /* warmer — nav links, secondary text */
  --color-ghost:        #C4BDB0;   /* product numbers, footer tag */

  --color-accent:       #6A9FBF;   /* sky blue — eyebrow, quote rule */
  --color-accent-bg:    #EAF3F8;   /* sky blue tint — button background */
  --color-accent-border:#B8D8E8;   /* sky blue mid — button border */
  --color-accent-dark:  #2E6A8A;   /* sky blue dark — button text */

  /* Typography */
  --font-ui:      'Nunito', sans-serif;       /* nav, headlines, buttons, labels */
  --font-body:    'Patrick Hand', cursive;    /* body text, product descriptions, quotes */

  /* Type scale */
  --text-xs:    11px;
  --text-sm:    12px;
  --text-base:  14px;
  --text-md:    15px;
  --text-lg:    20px;
  --text-xl:    34px;
  --text-hero:  42px;

  /* Spacing */
  --space-xs:   0.5rem;
  --space-sm:   1rem;
  --space-md:   1.5rem;
  --space-lg:   2.5rem;
  --space-xl:   3rem;
  --space-2xl:  4rem;
  --space-3xl:  6rem;

  /* Layout */
  --page-pad:   3rem;
  --radius-sm:  8px;
  --radius-md:  12px;
}


/* ------------------------------------------------------------
   RESET & BASE
   ------------------------------------------------------------ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-ui);
  line-height: 1.5;
}

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

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

h1, h2, h3 {
  font-weight: 400;
  line-height: 1.2;
}

blockquote {
  margin: 0;
  padding: 0;
}


/* ------------------------------------------------------------
   UTILITIES
   ------------------------------------------------------------ */

.divider {
  border: none;
  border-top: 0.5px solid var(--color-border);
  margin: 0 var(--page-pad);
}

.eyebrow {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-accent);
  font-weight: 400;
}

.section-label {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ghost);
  font-weight: 400;
  margin-bottom: var(--space-lg);
}

.btn-primary {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.08em;
  padding: 0.7rem 1.6rem;
  border-radius: 24px;
  background: var(--color-accent-bg);
  color: var(--color-accent-dark);
  border: 0.5px solid var(--color-accent-border);
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.btn-primary:hover {
  opacity: 0.8;
}


/* ------------------------------------------------------------
   NAVIGATION
   ------------------------------------------------------------ */

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem var(--page-pad);
  border-bottom: 0.5px solid var(--color-border);
  position: sticky;
  top: 0;
  background: var(--color-bg);
  z-index: 100;
}

.nav-wordmark {
  height: 22px;
  opacity: 0.85;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-muted);
  letter-spacing: 0.06em;
  font-weight: 400;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--color-ink);
}


/* ------------------------------------------------------------
   HERO
   ------------------------------------------------------------ */

.hero {
  padding: var(--space-3xl) var(--page-pad) var(--space-2xl);
  max-width: 640px;
}

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

.hero-headline {
  font-family: var(--font-ui);
  font-size: var(--text-hero);
  font-weight: 300;
  color: var(--color-ink);
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin-bottom: var(--space-md);
}

.hero-body {
  font-family: var(--font-body);
  font-size: var(--text-md);
  color: var(--color-body);
  line-height: 1.85;
  margin-bottom: var(--space-lg);
  max-width: 420px;
}


/* ------------------------------------------------------------
   PRODUCTS
   ------------------------------------------------------------ */

.products {
  padding: var(--space-2xl) var(--page-pad);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.product-card {
  padding: 1.75rem;
  border-radius: var(--radius-md);
  border: 0.5px solid var(--color-border);
  background: var(--color-surface);
  transition: border-color 0.2s ease;
}

.product-card:hover {
  border-color: var(--color-accent-border);
}

.product-num {
  display: block;
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-ghost);
  letter-spacing: 0.08em;
  margin-bottom: var(--sm);
  margin-bottom: var(--space-sm);
}

.product-name {
  font-family: var(--font-ui);
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--color-ink);
  letter-spacing: 0.02em;
  margin-bottom: 0.4rem;
}

.product-desc {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--color-body);
  line-height: 1.65;
}


/* ------------------------------------------------------------
   PHILOSOPHY
   ------------------------------------------------------------ */

.philosophy {
  padding: var(--space-2xl) var(--page-pad);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

.phil-quote {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-ink);
  line-height: 1.65;
  border-left: 1.5px solid var(--color-accent-border);
  padding-left: var(--space-md);
}

.phil-body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-body);
  line-height: 1.9;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}


/* ------------------------------------------------------------
   PRINCIPLES
   ------------------------------------------------------------ */

.principles {
  padding: 0 var(--page-pad) var(--space-2xl);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.principle {
  border-top: 0.5px solid var(--color-border);
  padding-top: 1.25rem;
}

.principle-title {
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  color: #3D4A45;
  margin-bottom: 0.5rem;
}

.principle-desc {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-body);
  line-height: 1.65;
}


/* ------------------------------------------------------------
   FOOTER
   ------------------------------------------------------------ */

.footer {
  padding: var(--space-md) var(--page-pad);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-wordmark {
  height: 16px;
  opacity: 0.35;
}

.footer-tag {
  font-family: var(--font-ui);
  font-size: var(--text-xs);
  color: var(--color-ghost);
  letter-spacing: 0.08em;
}


/* ------------------------------------------------------------
   RESPONSIVE — TABLET
   ------------------------------------------------------------ */

@media (max-width: 900px) {
  :root {
    --page-pad: 2rem;
  }

  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .philosophy {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .principles {
    grid-template-columns: repeat(2, 1fr);
  }
}


/* ------------------------------------------------------------
   RESPONSIVE — MOBILE
   ------------------------------------------------------------ */

@media (max-width: 580px) {
  :root {
    --page-pad: 1.25rem;
  }

  .nav-links {
    gap: 1.25rem;
  }

  .hero-headline {
    font-size: 30px;
  }

  .product-grid {
    grid-template-columns: 1fr;
  }

  .principles {
    grid-template-columns: 1fr;
  }

  .philosophy {
    padding: var(--space-lg) var(--page-pad);
  }
}


/* ------------------------------------------------------------
   REDUCED MOTION
   ------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}