/* ==========================================================================
   GLOBAL.CSS — Carbon Drawdown Symposium 2026
   Impressive, modern, clean — WCAG 2.1 AA compliant
   ========================================================================== */

/* 1. Fonts & Custom Properties
   -------------------------------------------------------------------------- */

@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Sans+Condensed:wght@600;700&family=IBM+Plex+Mono:wght@400&display=swap");

:root {
  /* Primary */
  --color-primary-hsl: 201, 98%, 41%;
  --color-primary: hsl(var(--color-primary-hsl));
  --color-primary-hover: hsl(201, 98%, 36%); /* -5% L */

  /* Secondary */
  --color-secondary-hsl: 93, 49%, 42%;
  --color-secondary: hsl(var(--color-secondary-hsl));
  --color-secondary-hover: hsl(93, 49%, 37%); /* -5% L */

  /* Backgrounds & Surfaces */
  --color-bg: hsl(204, 33%, 98%);
  --color-surface: hsl(0, 0%, 100%);
  --color-surface-alt: hsl(204, 28%, 96%);
  --color-surface-dark: hsl(210, 28%, 10%);
  --color-border: hsl(210, 20%, 88%);

  /* Text */
  --color-text: hsl(210, 24%, 12%);
  --color-text-muted: hsl(210, 10%, 38%);
  --color-text-inverse: hsl(0, 0%, 100%);
  --color-text-on-primary: hsl(0, 0%, 100%);
  --color-text-on-secondary: hsl(0, 0%, 100%);
  --color-text-on-surface-dark: hsl(0, 0%, 100%);

  /* Status */
  --color-success: hsl(154, 60%, 33%);
  --color-error: hsl(0, 74%, 45%);
  --color-overlay: hsla(210, 28%, 10%, 0.8);

  /* Spacing (8px base) */
  --space-xs: 0.25rem;  /* 4px */
  --space-sm: 0.5rem;   /* 8px */
  --space-md: 1rem;     /* 16px */
  --space-lg: 1.5rem;   /* 24px */
  --space-xl: 3rem;     /* 48px */
  --space-2xl: 5rem;    /* 80px */

  /* Typography */
  --font-heading: "IBM Plex Sans Condensed", system-ui, -apple-system, "Segoe UI",
    Roboto, Arial, sans-serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, Arial,
    sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --text-display: clamp(2.5rem, 5vw, 4rem);
  --text-h1: clamp(2rem, 4vw, 3rem);
  --text-h2: clamp(1.5rem, 3vw, 2rem);
  --text-h3: clamp(1.125rem, 2vw, 1.5rem);
  --text-body: 1rem;
  --text-small: 0.875rem;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px hsla(210, 28%, 10%, 0.08), 0 2px 8px hsla(210, 28%, 10%, 0.06);
  --shadow-md: 0 6px 18px hsla(210, 28%, 10%, 0.12), 0 2px 10px hsla(210, 28%, 10%, 0.08);
  --shadow-lg: 0 14px 40px hsla(210, 28%, 10%, 0.18), 0 6px 16px hsla(210, 28%, 10%, 0.12);

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition-base: 200ms ease;

  /* Layout */
  --container-max: 1200px;
}

/* 2. Reset
   -------------------------------------------------------------------------- */

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

html {
  color-scheme: light;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

a {
  color: inherit;
}

/* 3. Typography
   -------------------------------------------------------------------------- */

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  margin: 0 0 var(--space-md);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

h1 {
  font-size: var(--text-h1);
  font-weight: 700;
}

h2 {
  font-size: var(--text-h2);
  font-weight: 600;
}

h3 {
  font-size: var(--text-h3);
  font-weight: 600;
  line-height: 1.3;
}

h4 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
}

p {
  margin: 0 0 var(--space-md);
}

small,
.text-small {
  font-size: var(--text-small);
  line-height: 1.5;
}

code,
pre,
kbd,
samp {
  font-family: var(--font-mono);
}

a:not(.btn) {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.15em;
  text-decoration-thickness: 1px;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:not(.btn):hover {
  color: var(--color-primary-hover);
}

a:not(.btn):active {
  opacity: 0.9;
}

/* 4. Accessibility (skip link, focus, sr-only, reduced motion)
   -------------------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: var(--space-sm);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* 5. Layout & GrapesJS Grid
   -------------------------------------------------------------------------- */

.container {
  width: min(var(--container-max), calc(100% - (2 * var(--space-xl))));
  margin-inline: auto;
}

.section {
  padding-block: var(--space-2xl);
}

.section .section-header {
  margin-bottom: var(--space-xl);
}

.section .section-kicker {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-small);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.gjs-row {
  display: flex;
  justify-content: flex-start;
  align-items: stretch;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.gjs-cell {
  min-height: 50px;
  flex-grow: 1;
  flex-basis: 100%;
}

/* ==========================================================================
   SECTION COLOR UTILITIES
   Sets background, text, links, and button variants for full coverage
   ========================================================================== */

/* Dark sections (testimonials, CTAs, contrast areas) */
.section-dark {
  background-color: var(--color-surface-dark);
  color: var(--color-text-on-surface-dark);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4,
.section-dark h5,
.section-dark h6,
.section-dark p,
.section-dark span,
.section-dark li {
  color: inherit;
}

.section-dark a:not(.btn) {
  color: inherit;
  text-decoration: underline;
}

.section-dark a:not(.btn):hover {
  opacity: 0.85;
}

/* Buttons in dark sections - invert for contrast */
.section-dark .btn-primary {
  background-color: var(--color-text-on-surface-dark);
  color: var(--color-surface-dark);
}

.section-dark .btn-primary:hover {
  background-color: var(--color-surface);
  color: var(--color-surface-dark);
}

.section-dark .btn-outline {
  border-color: var(--color-text-on-surface-dark);
  color: var(--color-text-on-surface-dark);
}

.section-dark .btn-outline:hover {
  background-color: var(--color-text-on-surface-dark);
  color: var(--color-surface-dark);
}

/* Primary color sections */
.section-primary {
  background-color: var(--color-primary);
  color: var(--color-text-on-primary);
}

.section-primary h1,
.section-primary h2,
.section-primary h3,
.section-primary h4,
.section-primary h5,
.section-primary h6,
.section-primary p,
.section-primary span,
.section-primary li {
  color: inherit;
}

.section-primary a:not(.btn) {
  color: inherit;
  text-decoration: underline;
}

.section-primary a:not(.btn):hover {
  opacity: 0.9;
}

.section-primary .btn-primary {
  background-color: var(--color-text-on-primary);
  color: var(--color-primary);
}

.section-primary .btn-primary:hover {
  background-color: var(--color-surface);
  color: var(--color-primary);
}

.section-primary .btn-outline {
  border-color: var(--color-text-on-primary);
  color: var(--color-text-on-primary);
}

.section-primary .btn-outline:hover {
  background-color: var(--color-text-on-primary);
  color: var(--color-primary);
}

/* Secondary color sections */
.section-secondary {
  background-color: var(--color-secondary);
  color: var(--color-text-on-secondary);
}

.section-secondary h1,
.section-secondary h2,
.section-secondary h3,
.section-secondary h4,
.section-secondary h5,
.section-secondary h6,
.section-secondary p,
.section-secondary span,
.section-secondary li {
  color: inherit;
}

.section-secondary a:not(.btn) {
  color: inherit;
  text-decoration: underline;
}

.section-secondary a:not(.btn):hover {
  opacity: 0.9;
}

.section-secondary .btn-primary {
  background-color: var(--color-text-on-secondary);
  color: var(--color-secondary);
}

.section-secondary .btn-primary:hover {
  background-color: var(--color-surface);
  color: var(--color-secondary);
}

.section-secondary .btn-outline {
  border-color: var(--color-text-on-secondary);
  color: var(--color-text-on-secondary);
}

.section-secondary .btn-outline:hover {
  background-color: var(--color-text-on-secondary);
  color: var(--color-secondary);
}

/* Light alternate sections */
.section-light {
  background-color: var(--color-surface-alt);
  color: var(--color-text);
}

/* 6. Components (buttons, inputs, cards)
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  min-height: 44px;
  padding: 0 var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-fast),
    box-shadow var(--transition-base);
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px hsla(var(--color-primary-hsl), 0.3);
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

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

.btn-outline:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

.btn-small {
  min-height: 36px;
  padding: 0 var(--space-sm);
  font-size: var(--text-small);
}

.input,
select,
textarea,
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
input[type="search"],
input[type="password"] {
  width: 100%;
  min-height: 44px;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  color: var(--color-text);
  box-shadow: none;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

textarea,
textarea.input {
  min-height: 120px;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
  resize: vertical;
}

label {
  display: inline-block;
  margin-bottom: var(--space-xs);
  font-size: var(--text-small);
  color: var(--color-text);
  font-weight: 600;
}

input::placeholder,
textarea::placeholder {
  color: var(--color-text-muted);
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px hsla(var(--color-primary-hsl), 0.18);
}

.input[aria-invalid="true"],
input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--color-error);
}

.input[aria-invalid="true"]:focus-visible,
input[aria-invalid="true"]:focus-visible,
select[aria-invalid="true"]:focus-visible,
textarea[aria-invalid="true"]:focus-visible {
  outline: 2px solid var(--color-error);
  box-shadow: 0 0 0 4px hsla(0, 74%, 45%, 0.18);
}

.help-text {
  margin-top: var(--space-xs);
  font-size: var(--text-small);
  color: var(--color-text-muted);
}

.form-error {
  margin-top: var(--space-xs);
  font-size: var(--text-small);
  color: var(--color-error);
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: var(--space-lg);
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: hsla(var(--color-primary-hsl), 0.25);
}

/* 7. Utilities
   -------------------------------------------------------------------------- */

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-primary {
  color: var(--color-primary);
}

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

.mt-md {
  margin-top: var(--space-md);
}

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

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.mt-xl {
  margin-top: var(--space-xl);
}

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

/* 8. Responsive
   -------------------------------------------------------------------------- */

@media (min-width: 768px) {
  .gjs-row {
    flex-wrap: nowrap;
  }

  .gjs-cell {
    flex-basis: 0;
  }
}

@media (max-width: 1023px) {
  .container {
    width: min(var(--container-max), calc(100% - (2 * var(--space-lg))));
  }

  .section {
    padding-block: calc(var(--space-2xl) - var(--space-md));
  }
}

@media (max-width: 767px) {
  .container {
    width: calc(100% - (2 * var(--space-md)));
  }

  .section {
    padding-block: calc(var(--space-xl) + var(--space-md));
  }

  .btn {
    width: 100%;
  }
}