/* ============================================================
   STERLING BIN CO. — DESIGN SYSTEM
   Reusable tokens. Carry across plans, booking flow, dashboard.
   ============================================================ */

:root {
  /* Palette ---------------------------------------------------- */
  --ink:       #15161B;   /* near-black charcoal — primary text, dark sections */
  --graphite:  #33363F;   /* secondary dark */
  --pewter:    #6E727A;   /* mid grey — secondary text */
  --silver:    #AFB4BB;   /* tertiary, borders */
  --mist:      #E6E7EA;   /* hairlines, soft fills */
  --paper:     #F6F5F2;   /* warm off-white page background */
  --champagne: #B79C7D;   /* metallic accent — used like jewelry */

  /* Type ------------------------------------------------------- */
  --font-display: 'Fraunces', Georgia, serif;
  --font-sans:    'Hanken Grotesk', system-ui, sans-serif;

  /* Motion ----------------------------------------------------- */
  --ease:        cubic-bezier(0.22, 0.61, 0.36, 1);
  --t-slow:      560ms;
  --t-med:       380ms;
  --t-fast:      220ms;

  /* Rhythm ----------------------------------------------------- */
  --shell-x: clamp(20px, 5vw, 64px);
  --rule:    1px solid var(--mist);
  --rule-champagne: 1px solid color-mix(in oklab, var(--champagne) 60%, transparent);
}

/* ============================================================
   BASE
   ============================================================ */
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); }

::selection { background: color-mix(in oklab, var(--champagne) 35%, transparent); color: var(--ink); }

/* Fraunces display: tighter leading, subtle optical-size pull */
.font-display { font-family: var(--font-display); font-optical-sizing: auto; letter-spacing: -0.012em; }
.display { font-family: var(--font-display); font-weight: 300; letter-spacing: -0.02em; line-height: 0.98; font-optical-sizing: auto; }
.display em { font-style: italic; font-weight: 300; color: var(--graphite); }

/* Eyebrow / small-caps tracked label */
.eyebrow {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--champagne);
}
.eyebrow--mist { color: var(--silver); }

/* Wordmark */
.wordmark {
  font-family: var(--font-sans);
  font-weight: 500;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}

/* ============================================================
   ATMOSPHERE — paper grain
   ============================================================ */
.grain {
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220' viewBox='0 0 220 220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.08  0 0 0 0 0.08  0 0 0 0 0.10  0 0 0 0.16 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  background-size: 220px 220px;
}

/* ============================================================
   HAIRLINES & LINKS
   ============================================================ */
.rule       { border-top: var(--rule); }
.rule-bot   { border-bottom: var(--rule); }
.rule-v     { border-left: var(--rule); }
.rule-cham  { border-top: var(--rule-champagne); }

/* The signature "hairline draw" link */
.link {
  position: relative;
  display: inline-block;
  color: inherit;
  text-decoration: none;
  padding-bottom: 3px;
  transition: color var(--t-med) var(--ease);
}
.link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: currentColor;
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform var(--t-slow) var(--ease);
}
.link:hover::after,
.link:focus-visible::after { transform: scaleX(1); }

/* Champagne-underlined link (used in nav CTA, hero CTA) */
.link-cham {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5ch;
  color: var(--ink);
  text-decoration: none;
  padding-bottom: 4px;
  font-weight: 500;
  transition: color var(--t-med) var(--ease);
}
.link-cham::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 1px;
  background: var(--champagne);
  transform-origin: left center;
  transition: transform var(--t-slow) var(--ease);
}
.link-cham:hover { color: var(--graphite); }
.link-cham .arrow { transition: transform var(--t-med) var(--ease); color: var(--champagne); }
.link-cham:hover .arrow,
.link-cham:focus-visible .arrow { transform: translateX(4px); }

/* Inverse on dark sections */
.on-dark .link::after,
.on-dark .link-cham::after { background: var(--champagne); }
.on-dark .link-cham { color: var(--paper); }
.on-dark .link-cham:hover { color: var(--mist); }

/* ============================================================
   FOCUS — visible, restrained, brand-correct
   ============================================================ */
:focus { outline: none; }
:focus-visible {
  outline: 1px solid var(--champagne);
  outline-offset: 3px;
}

/* ============================================================
   FORMS — input with champagne hairline focus
   ============================================================ */
.field {
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--silver);
  transition: border-color var(--t-med) var(--ease);
}
.field:focus-within { border-bottom-color: var(--champagne); }
.field input {
  flex: 1;
  background: transparent;
  border: 0;
  outline: none;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(20px, 2.2vw, 28px);
  letter-spacing: -0.01em;
  color: var(--ink);
  padding: 18px 0;
}
.field input::placeholder { color: var(--silver); font-style: italic; }
.field button {
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
  background: transparent;
  border: 0;
  padding: 10px 0 10px 24px;
  cursor: pointer;
  transition: color var(--t-med) var(--ease);
}
.field button:hover { color: var(--champagne); }

/* ============================================================
   IMAGE FRAME (placeholder + real photo, same chrome)
   ============================================================ */
.frame {
  position: relative;
  background: var(--mist);
  border: 1px solid var(--silver);
  outline: 1px solid transparent;
  outline-offset: 8px;
  overflow: hidden;
}
.frame::after {
  /* inner hairline */
  content: "";
  position: absolute; inset: 8px;
  border: 1px solid color-mix(in oklab, var(--paper) 60%, transparent);
  pointer-events: none;
}
.frame img {
  width: 100%; height: 100%; object-fit: cover;
  filter: grayscale(1) contrast(1.05);
}
.frame-caption {
  position: absolute;
  left: 16px; bottom: 12px;
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper);
  text-shadow: 0 1px 2px rgba(0,0,0,0.45);
  z-index: 2;
}

/* Placeholder textures used inside .frame when no photo */
.placeholder {
  position: absolute; inset: 0;
}
.placeholder-dark {
  background:
    radial-gradient(120% 80% at 30% 10%, #2b2c33 0%, #15161B 60%, #0c0d11 100%);
}
.placeholder-light {
  background:
    radial-gradient(120% 80% at 70% 10%, #fbfaf7 0%, #ECE9E3 55%, #D9D6CF 100%);
}
.placeholder-warm {
  background:
    linear-gradient(170deg, #2a2b32 0%, #1b1c22 60%, #131319 100%);
}

/* Hairline interior grid for editorial frame */
.placeholder-grid::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 56px 56px;
}

/* ============================================================
   PAGE-LOAD REVEAL (staggered fade + translate up)
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  animation: reveal var(--t-slow) var(--ease) forwards;
  animation-delay: var(--d, 0ms);
}
@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}

/* In-view reveal (for sections beyond the fold) */
.iv {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}
.iv.is-in {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal, .iv {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  html { scroll-behavior: auto; }
}

/* ============================================================
   NAV — sticky, transparent→paper on scroll
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  transition: background-color var(--t-med) var(--ease),
              border-color var(--t-med) var(--ease),
              color var(--t-med) var(--ease);
  background: transparent;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: color-mix(in oklab, var(--paper) 94%, transparent);
  backdrop-filter: saturate(1.05) blur(6px);
  -webkit-backdrop-filter: saturate(1.05) blur(6px);
  border-bottom-color: var(--mist);
}

/* ============================================================
   PROOF / BEFORE-AFTER REVEAL SLIDER
   ============================================================ */
.compare {
  position: relative;
  overflow: hidden;
  user-select: none;
  -webkit-user-select: none;
  cursor: ew-resize;
  background: var(--ink);
}
.compare-layer {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}
.compare-after {
  /* clipped from left; controlled via inline style --x */
  clip-path: inset(0 0 0 var(--x, 50%));
}
.compare-handle {
  position: absolute;
  top: 0; bottom: 0;
  left: var(--x, 50%);
  width: 1px;
  background: var(--champagne);
  transform: translateX(-0.5px);
  pointer-events: none;
}
.compare-knob {
  position: absolute;
  top: 50%;
  left: var(--x, 50%);
  width: 44px; height: 44px;
  transform: translate(-50%, -50%);
  border: 1px solid var(--champagne);
  background: color-mix(in oklab, var(--paper) 92%, transparent);
  border-radius: 999px;
  display: grid;
  place-items: center;
  cursor: ew-resize;
  transition: background-color var(--t-med) var(--ease), transform var(--t-fast) var(--ease);
}
.compare-knob:hover { background: var(--paper); }
.compare-knob:active { transform: translate(-50%, -50%) scale(0.96); }
.compare-knob svg { color: var(--ink); }

/* Label chips inside the compare */
.compare-chip {
  position: absolute;
  top: 18px;
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper);
  background: color-mix(in oklab, var(--ink) 55%, transparent);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  padding: 8px 12px;
  border: 1px solid color-mix(in oklab, var(--paper) 20%, transparent);
}

/* ============================================================
   PLANS — clean tier row
   ============================================================ */
.plan {
  position: relative;
  padding: 40px 32px 36px;
  border-top: 1px solid var(--mist);
  display: flex;
  flex-direction: column;
  min-height: 100%;
}
.plan + .plan { border-left: 1px solid var(--mist); }
@media (max-width: 880px) {
  .plan + .plan { border-left: 0; }
}
.plan--popular {
  background:
    linear-gradient(180deg, color-mix(in oklab, var(--champagne) 6%, transparent) 0%, transparent 30%);
}
.plan--popular::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 1px;
  background: var(--champagne);
}
.plan-mark {
  position: absolute;
  top: 14px; right: 24px;
  font-family: var(--font-sans);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--champagne);
}

/* ============================================================
   NEIGHBORHOOD CHIPS — quiet, no pill drama
   ============================================================ */
.nbhd {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  color: var(--graphite);
}
.nbhd::before {
  content: "";
  width: 6px; height: 1px;
  background: var(--champagne);
  display: inline-block;
}

/* ============================================================
   UTILITIES
   ============================================================ */
.shell { max-width: 1320px; margin: 0 auto; padding-left: var(--shell-x); padding-right: var(--shell-x); }
.balance { text-wrap: balance; }
.pretty  { text-wrap: pretty; }

/* Tiny numeric monogram used in process steps */
.numeral {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(64px, 8vw, 112px);
  line-height: 1;
  color: var(--silver);
  font-variant-numeric: lining-nums;
}