/* ==========================================================================
   RBT Bank — Design Tokens
   Single source of truth for color, type, spacing, shadows, glass, motion.
   Components below must consume these variables — no hardcoded raw values.
   This file must be loaded FIRST on every page — every other stylesheet
   (nav.css, footer.css, home.css, about.css, products-services.css,
   responsive.css, animations.css) depends on these custom properties and
   on the base/layout rules below.
   ========================================================================== */

:root {
  /* Brand palette — from assets/images/color palette.png. No gold in this
     brand; --color-gold is kept as a token name (52 existing consumers)
     but repurposed to the cyan accent below. */
  --color-blue: #0077b6; /* primary — actions, links, focus */
  --color-navy: #03045e; /* dark backgrounds — header/hero/footer */
  --color-gold: #00b4d8; /* accent — cyan, used sparingly for CTAs/highlights */
  --color-white: #ffffff;
  --color-light-gray: #caf0f8; /* section backgrounds on light pages */

  /* Derived shades (for gradients, hover states, borders) */
  --color-blue-600: #00669e;
  --color-blue-700: #005580;
  --color-navy-800: #020340;
  --color-navy-700: #020347;
  --color-gold-600: #007a94; /* darker than --color-gold for AA contrast on white (eyebrows) */
  --color-tint-light: #90e0ef; /* lighter section tint, between light-gray and white */
  --color-section-tint: #eef9fc; /* very pale blue section background (Explore our Services) */

  --color-text: #12233b; /* headings/body on light backgrounds */
  --color-text-muted: #55647a; /* secondary text on light backgrounds */
  --color-text-inverse: #ffffff; /* text on navy/dark backgrounds */
  --color-text-inverse-muted: #b9c4d6;

  --color-border: rgba(0, 119, 182, 0.12);
  --color-border-inverse: rgba(255, 255, 255, 0.14);

  /* Functional colors — status only, never decorative */
  --color-success: #157a4a;
  --color-danger: #b3261e;
  --color-warning: #97650a;

  /* Type */
  --font-heading:
    "Poppins", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-body:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --font-size-2xs: 0.75rem; /* 12px */
  --font-size-xs: 0.8125rem; /* 13px */
  --font-size-sm: 0.9375rem; /* 15px */
  --font-size-base: 1rem; /* 16px */
  --font-size-lg: 1.25rem; /* 20px */
  --font-size-xl: 1.625rem; /* 26px */
  --font-size-2xl: 2.0625rem; /* 33px */
  --font-size-3xl: 2.75rem; /* 44px */
  --font-size-4xl: 3.5rem; /* 56px */

  --line-height-tight: 1.15;
  --line-height-base: 1.6;

  /* Spacing — 4px unit */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Elevation + glass
     Two-layer shadows: a tight contact shadow grounds the element, a wide
     soft one gives it height. A single blur reads flat and cheap by
     comparison — this is the biggest low-effort lift in the whole system.
     Tinted with the brand navy rather than neutral black so elevation
     feels part of the palette instead of a grey wash over it. */
  --shadow-sm:
    0 1px 2px rgba(3, 4, 94, 0.06),
    0 2px 8px rgba(3, 4, 94, 0.05);
  --shadow-md:
    0 2px 4px rgba(3, 4, 94, 0.05),
    0 10px 28px rgba(3, 4, 94, 0.1);
  --shadow-lg:
    0 4px 10px rgba(3, 4, 94, 0.06),
    0 24px 56px rgba(3, 4, 94, 0.16);
  --shadow-xl:
    0 8px 18px rgba(3, 4, 94, 0.08),
    0 44px 88px rgba(3, 4, 94, 0.2);
  --shadow-gold: 0 2px 6px rgba(0, 180, 216, 0.2), 0 12px 28px rgba(0, 180, 216, 0.28);

  /* Hairline rings — pair with a shadow to define an edge without the
     wireframe look a full 1px border gives every surface. */
  --ring: inset 0 0 0 1px rgba(0, 119, 182, 0.1);
  --ring-strong: 0 0 0 3px rgba(0, 119, 182, 0.16);

  --glass-bg: rgba(255, 255, 255, 0.65);
  --glass-bg-dark: rgba(7, 26, 47, 0.55);
  --glass-border: rgba(255, 255, 255, 0.35);
  --glass-blur: 16px;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --radius-full: 999px;

  /* Motion
     --ease-emphasized leaves fast and settles slowly (Material's emphasized
     curve): the right default for anything entering the screen.
     --ease-spring overshoots slightly — reserve it for small, playful
     confirmations, never for large surfaces on a bank site. */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --ease-spring: cubic-bezier(0.34, 1.4, 0.64, 1);
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 450ms;
  --duration-slower: 700ms;

  --nav-height: 108px;
  --nav-height-shrunk: 92px;
}

/* ==========================================================================
   Reset + base
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-white);
  overflow-x: hidden;
}

h1,
h2,
h3,
h4,
h5,
p,
figure {
  margin: 0;
}

h1,
h2,
h3,
h4,
h5 {
  font-family: var(--font-heading);
  line-height: var(--line-height-tight);
  font-weight: 700;
  color: var(--color-navy);
}

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

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

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Visible, consistent focus state for keyboard users. The soft halo behind
   the hard outline keeps it legible on both white and navy surfaces. */
:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
  box-shadow: var(--ring-strong);
}

/* On dark sections the blue outline sinks into the background — go white. */
.section--dark :focus-visible,
.site-header.is-scrolled :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--color-white);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.22);
}

/* Cross-document View Transitions — zero JS, zero dependency. Degrades
   gracefully: unsupported browsers just navigate normally. */
@view-transition {
  navigation: auto;
}

/* ==========================================================================
   Layout
   ========================================================================== */

.container {
  max-width: 80rem;
  margin-inline: auto;
  padding-inline: var(--space-6);
}

section {
  padding-block: var(--space-24);
}

.section-heading {
  max-width: 40rem;
  margin-bottom: var(--space-12);
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  font-weight: 200;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold-600);
  margin-bottom: var(--space-3);
}

.section-heading h2 {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
}

.section-heading p {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
}

.section--dark {
  background: linear-gradient(
    180deg,
    var(--color-navy) 0%,
    var(--color-navy-800) 100%
  );
  color: var(--color-text-inverse);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-text-inverse);
}

.section--dark .section-heading p {
  color: var(--color-text-inverse-muted);
}

.section--light {
  background: var(--color-light-gray);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

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

/* Centered variant — used by any section-heading that isn't left-aligned
   (About Page, Loan Products, Board of Directors, etc.). */
.section-heading--center {
  max-width: 48rem;
  margin-inline: auto;
  text-align: center;
}

.section-heading__rule {
  display: block;
  width: 56px;
  height: 3px;
  margin: var(--space-4) auto 0;
  /* Gradient rather than flat navy, fading into the cyan accent — the same
     brand gradient the primary buttons use, so the accent reads as one
     system rather than a decorative stripe. */
  background: linear-gradient(90deg, var(--color-navy) 0%, var(--color-gold) 100%);
  border-radius: var(--radius-full);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 48px;
  padding-inline: var(--space-8);
  border-radius: var(--radius-full);
  border: 1px solid transparent;
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  /* Set by initMagneticButtons in main.js — the button leans a few pixels
     toward the cursor. Falls back to 0 with JS off. */
  --btn-pull-x: 0px;
  --btn-pull-y: 0px;
  transform: translate3d(var(--btn-pull-x), var(--btn-pull-y), 0);
  transition:
    transform var(--duration-base) var(--ease-out),
    box-shadow var(--duration-base) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out),
    filter var(--duration-fast) var(--ease-out);
}

/* Sheen — a soft highlight that sweeps across on hover. Skewed so it reads
   as light catching a surface rather than a bar sliding past. */
.btn::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -75%;
  width: 50%;
  height: 200%;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.28) 50%,
    transparent 100%
  );
  transform: translateX(0) skewX(-18deg);
  opacity: 0;
  transition: transform var(--duration-slower) var(--ease-out), opacity var(--duration-fast) linear;
}

.btn:hover::after {
  transform: translateX(420%) skewX(-18deg);
  opacity: 1;
}

/* Arrows and glyphs lean toward the direction of travel. */
.btn svg {
  transition: transform var(--duration-base) var(--ease-out);
}

.btn:hover svg {
  transform: translateX(2px);
}

.btn:active {
  transform: translate3d(var(--btn-pull-x), var(--btn-pull-y), 0) scale(0.97);
  transition-duration: var(--duration-fast);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  filter: saturate(0.6);
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background: linear-gradient(
    135deg,
    var(--color-blue) 0%,
    var(--color-blue-700) 100%
  );
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  box-shadow: var(--shadow-xl);
  filter: brightness(1.06);
  transform: translate3d(var(--btn-pull-x), calc(var(--btn-pull-y) - 2px), 0);
}

.btn--gold {
  background: linear-gradient(
    135deg,
    var(--color-gold) 0%,
    var(--color-gold-600) 100%
  );
  color: var(--color-navy);
  box-shadow: var(--shadow-gold);
}

.btn--gold:hover {
  box-shadow: var(--shadow-xl);
  filter: brightness(1.06);
  transform: translate3d(var(--btn-pull-x), calc(var(--btn-pull-y) - 2px), 0);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-border-inverse);
  color: var(--color-text-inverse);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
}

.btn--outline {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-navy);
}

.btn--outline:hover {
  background: var(--color-light-gray);
}

.btn--navy {
  background: linear-gradient(
    135deg,
    var(--color-navy) 0%,
    var(--color-navy-800) 100%
  );
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn--navy:hover {
  box-shadow: var(--shadow-xl);
  filter: brightness(1.12);
  transform: translate3d(var(--btn-pull-x), calc(var(--btn-pull-y) - 2px), 0);
}

/* Outline/ghost buttons have no fill for a sheen to catch. */
.btn--outline::after,
.btn--ghost::after {
  display: none;
}

.btn--outline:hover {
  border-color: var(--color-blue);
  box-shadow: var(--shadow-sm);
}

/* Ripple effect — element added by assets/js/main.js on click */
.btn__ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: scale(0);
  pointer-events: none;
  animation: ripple 600ms var(--ease-out);
}

/* ==========================================================================
   Glass utility
   ========================================================================== */

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
}

.glass--dark {
  background: var(--glass-bg-dark);
  border-color: rgba(255, 255, 255, 0.1);
}