/* ============================================================
   STARTUP ASSIST UK — GLOBAL STYLES
   Structured, calm UK professional-services aesthetic.
   ============================================================ */

@import './tokens.css';

/* ── Reset & box model ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Base ── */
html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-normal);
  line-height: var(--lh-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ── Accessible Focus Ring ── */
:focus-visible {
  outline: 2px solid var(--color-teal);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

/* ── Typography & Hierarchy ── */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  color: var(--color-navy);
  letter-spacing: -0.025em;
}

h1 {
  font-size: clamp(2rem, 4.5vw + 0.5rem, 2.875rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.5rem, 3vw + 0.25rem, 2.25rem);
  letter-spacing: -0.025em;
  line-height: 1.22;
}

h3 {
  font-size: clamp(1.25rem, 2vw + 0.25rem, 1.625rem);
  letter-spacing: -0.018em;
  line-height: 1.3;
}

h4 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.012em;
  line-height: 1.35;
}

p {
  max-width: var(--max-w-prose);
  color: var(--color-text);
}

a {
  color: var(--color-teal);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1.5px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-teal-hover);
  text-decoration-thickness: 2px;
}

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

ul, ol {
  padding-left: var(--space-6);
}

/* ── Layout helpers ── */
.container {
  width: 100%;
  max-width: var(--max-w-site);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

@media (max-width: 640px) {
  .container {
    padding-inline: var(--space-4);
  }
}

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

.section {
  padding-block: clamp(var(--space-12), 6vw, var(--space-20));
}

.section--alt {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

/* ── Buttons — Solid, tactile, trustworthy ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: 1.2;
  padding: 0.875rem 1.75rem;
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              transform var(--transition-fast);
  white-space: nowrap;
  min-height: 48px; /* Touch target */
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

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

.btn--primary {
  background-color: var(--color-teal);
  color: var(--color-white);
  border-color: var(--color-teal);
  box-shadow: 0 1px 3px rgba(19, 34, 56, 0.12), 0 2px 6px rgba(26, 117, 108, 0.24);
}

.btn--primary:hover {
  background-color: var(--color-teal-hover);
  border-color: var(--color-teal-hover);
  color: var(--color-white);
  box-shadow: 0 2px 6px rgba(19, 34, 56, 0.15), 0 4px 12px rgba(26, 117, 108, 0.32);
}

.btn--primary:focus-visible {
  outline: 2px solid var(--color-navy);
  outline-offset: 3px;
}

.btn--outline {
  background-color: var(--color-white);
  color: var(--color-navy);
  border-color: var(--color-navy);
  box-shadow: var(--shadow-xs);
}

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

.btn--outline:focus-visible {
  outline: 2px solid var(--color-teal);
  outline-offset: 3px;
}

.btn--ghost {
  background: transparent;
  border: none;
  color: var(--color-navy);
  font-weight: var(--fw-semibold);
  padding: 0.5rem 0.75rem;
  min-height: auto;
  text-decoration: underline;
  text-underline-offset: 3px;
  border-radius: var(--radius-sm);
}

.btn--ghost:hover {
  color: var(--color-teal);
  background-color: rgba(26, 117, 108, 0.06);
}

.btn--lg {
  font-size: var(--fs-md);
  padding: 1rem 2rem;
  min-height: 52px;
}

.btn--full {
  width: 100%;
}

/* ── Eyebrow label ── */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-teal);
  margin-bottom: var(--space-3);
}

/* ── Generic Cards ── */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border);
}

/* ── Grid helpers ── */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 1024px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

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

/* ── Skip link ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  background: var(--color-navy);
  color: var(--color-white);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: var(--fw-semibold);
  text-decoration: none;
  box-shadow: var(--shadow-lg);
}

.skip-link:focus {
  top: var(--space-4);
  outline: 2px solid var(--color-teal);
  outline-offset: 2px;
}

/* ── Disclaimer note ── */
.disclaimer {
  font-size: var(--fs-sm);
  color: var(--color-muted);
  line-height: var(--lh-snug);
}

/* ── Icon circle wrapper ── */
.icon-circle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  border-radius: var(--radius-md);
  background-color: var(--color-teal-light);
  color: var(--color-teal);
  border: 1px solid rgba(26, 117, 108, 0.15);
}

/* ── Divider ── */
.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin-block: var(--space-8);
}

/* ── Text helpers ── */
.text-center { text-align: center; }
.text-muted  { color: var(--color-muted); }
.text-navy   { color: var(--color-navy); }
.text-teal   { color: var(--color-teal); }

/* ── Scrollbar (subtle) ── */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-alt); }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: #C8C2B7; }