/* ========================================
   DESIGN TOKENS — David Sandison & Co
   Navy blue corporate palette
   ======================================== */

:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Spacing (4px base) */
  --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;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fonts */
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
}

/* ========================================
   LIGHT MODE (default)
   ======================================== */
:root, [data-theme="light"] {
  /* Surfaces — cool white with subtle warmth */
  --color-bg:             #f5f6f8;
  --color-surface:        #ffffff;
  --color-surface-2:      #fafbfc;
  --color-surface-offset: #eef0f4;
  --color-divider:        #d8dce4;
  --color-border:         #c8cdd8;

  /* Text */
  --color-text:           #1a1f2e;
  --color-text-muted:     #5a6178;
  --color-text-faint:     #9499ab;
  --color-text-inverse:   #f5f6f8;

  /* Primary — DSC Navy */
  --color-primary:        #0E2C62;
  --color-primary-hover:  #0a2050;
  --color-primary-active: #071840;
  --color-primary-light:  #e8ecf4;

  /* Accent — Warm gold for subtle highlights */
  --color-accent:         #b8860b;
  --color-accent-hover:   #9a7209;
  --color-accent-light:   #faf3e0;

  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0.2 0.02 250 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.02 250 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.02 250 / 0.12);
}

/* ========================================
   DARK MODE
   ======================================== */
[data-theme="dark"] {
  --color-bg:             #0f1219;
  --color-surface:        #171b24;
  --color-surface-2:      #1c2130;
  --color-surface-offset: #141822;
  --color-divider:        #252b3a;
  --color-border:         #333a4d;

  --color-text:           #d0d4de;
  --color-text-muted:     #8890a4;
  --color-text-faint:     #5a6178;
  --color-text-inverse:   #1a1f2e;

  --color-primary:        #6889c4;
  --color-primary-hover:  #4f72b0;
  --color-primary-active: #3a5c9a;
  --color-primary-light:  #1e2640;

  --color-accent:         #d4a830;
  --color-accent-hover:   #c09520;
  --color-accent-light:   #2a2418;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:             #0f1219;
    --color-surface:        #171b24;
    --color-surface-2:      #1c2130;
    --color-surface-offset: #141822;
    --color-divider:        #252b3a;
    --color-border:         #333a4d;
    --color-text:           #d0d4de;
    --color-text-muted:     #8890a4;
    --color-text-faint:     #5a6178;
    --color-text-inverse:   #1a1f2e;
    --color-primary:        #6889c4;
    --color-primary-hover:  #4f72b0;
    --color-primary-active: #3a5c9a;
    --color-primary-light:  #1e2640;
    --color-accent:         #d4a830;
    --color-accent-hover:   #c09520;
    --color-accent-light:   #2a2418;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.2);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.3);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.4);
  }
}

/* ========================================
   GLOBAL STYLES
   ======================================== */

a {
  color: var(--color-primary);
  text-decoration: none;
}
a:hover {
  color: var(--color-primary-hover);
}

/* ========================================
   SKIP LINK
   ======================================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  z-index: 100;
}
.skip-link:focus {
  top: var(--space-2);
}

/* ========================================
   HEADER & NAV
   ======================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-surface) l c h / 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s ease;
}
.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-3) var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}
.logo-mark {
  flex-shrink: 0;
}
.logo-text {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  line-height: 1.3;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.main-nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.main-nav a:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Theme toggle */
.theme-toggle {
  padding: var(--space-2);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
  display: none;
  padding: var(--space-2);
  color: var(--color-text-muted);
}

/* CTA button */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  color: var(--color-text-inverse);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: transparent;
  color: var(--color-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* ========================================
   HERO
   ======================================== */
.hero {
  padding: clamp(var(--space-16), 10vw, var(--space-32)) var(--space-4);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 80% 40%, oklch(0.3 0.06 250 / 0.4), transparent),
    radial-gradient(ellipse 60% 80% at 20% 80%, oklch(0.15 0.04 250 / 0.3), transparent);
  pointer-events: none;
}
.hero-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}
.hero-content {
  max-width: 700px;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: var(--space-6);
  color: #ffffff;
}
.hero-subtitle {
  font-size: var(--text-base);
  line-height: 1.7;
  color: oklch(1 0 0 / 0.8);
  max-width: 560px;
  margin-bottom: var(--space-8);
}
.hero-cta {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.hero .btn-primary {
  background: #ffffff;
  color: var(--color-primary);
}
.hero .btn-primary:hover {
  background: oklch(1 0 0 / 0.9);
  color: var(--color-primary-hover);
}
.hero .btn-outline {
  border-color: oklch(1 0 0 / 0.4);
  color: #ffffff;
}
.hero .btn-outline:hover {
  background: oklch(1 0 0 / 0.12);
  border-color: oklch(1 0 0 / 0.6);
  color: #ffffff;
}

/* Credentials bar */
.credentials {
  padding: var(--space-6) var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
}
.credentials-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  justify-content: center;
  gap: var(--space-10);
  flex-wrap: wrap;
}
.credential-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  white-space: nowrap;
}
.credential-item svg {
  color: var(--color-primary);
  flex-shrink: 0;
}

/* ========================================
   SECTIONS
   ======================================== */
.section {
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-4);
}
.section-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}
.section-alt {
  background: var(--color-surface-offset);
}
.section-header {
  margin-bottom: clamp(var(--space-8), 4vw, var(--space-16));
}
.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.section-desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 600px;
  line-height: 1.7;
}

/* ========================================
   SERVICES
   ======================================== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr));
  gap: var(--space-6);
}
.service-card {
  background: var(--color-surface);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.service-icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}
.service-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.service-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}
.service-card ul {
  list-style: none;
  padding: 0;
  margin-top: var(--space-4);
}
.service-card li {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-1) 0;
  padding-left: var(--space-5);
  position: relative;
}
.service-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  opacity: 0.5;
}

/* ========================================
   ABOUT / TEAM
   ======================================== */
.about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: start;
}
@media (min-width: 768px) {
  .about-layout {
    grid-template-columns: 280px 1fr;
  }
}
.about-photo-wrapper {
  position: relative;
}
.about-photo {
  width: 100%;
  max-width: 280px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}
.about-content h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.about-role {
  font-size: var(--text-sm);
  color: var(--color-primary);
  font-weight: 500;
  margin-bottom: var(--space-6);
}
.about-bio {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}
.about-bio p + p {
  margin-top: var(--space-4);
}

/* Team placeholder grid */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(200px, 100%), 1fr));
  gap: var(--space-6);
  margin-top: var(--space-10);
}
.team-card {
  text-align: center;
  padding: var(--space-6);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
}
.team-photo-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--color-primary-light);
  margin: 0 auto var(--space-4);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--text-lg);
}
.team-card h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.team-card .team-role {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ========================================
   TESTIMONIALS
   ======================================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: var(--space-6);
}
.testimonial-card {
  background: var(--color-surface);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  position: relative;
}
.testimonial-quote {
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: var(--space-6);
}
.testimonial-quote::before {
  content: '\201C';
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--color-primary);
  opacity: 0.3;
  display: block;
  line-height: 1;
  margin-bottom: var(--space-2);
}
.testimonial-author {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.testimonial-role {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}
.testimonial-placeholder-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-style: italic;
  margin-top: var(--space-2);
}

/* ========================================
   CASE STUDIES
   ======================================== */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: var(--space-6);
}
.case-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  overflow: hidden;
  transition: box-shadow var(--transition-interactive);
}
.case-card:hover {
  box-shadow: var(--shadow-md);
}
.case-tag-bar {
  padding: var(--space-3) var(--space-6);
  background: var(--color-primary-light);
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}
.case-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.case-body {
  padding: var(--space-6);
}
.case-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}
.case-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}
.case-outcome {
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}
.case-outcome strong {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: var(--space-1);
}
.case-outcome span {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ========================================
   CONTACT
   ======================================== */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}
@media (min-width: 768px) {
  .contact-layout {
    grid-template-columns: 1fr 1fr;
  }
}
.contact-info h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-6);
}
.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}
.contact-detail svg {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}
.contact-detail-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}
.contact-detail-text strong {
  display: block;
  color: var(--color-text);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.contact-form {
  background: var(--color-surface);
  padding: var(--space-8);
  border-radius: var(--radius-lg);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
}
.form-group {
  margin-bottom: var(--space-5);
}
.form-group label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.12);
}
.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* ========================================
   FOOTER
   ======================================== */
.site-footer {
  background: var(--color-primary);
  color: oklch(1 0 0 / 0.7);
  padding: var(--space-12) var(--space-4) var(--space-6);
}
.footer-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}
.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}
@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 2fr 1fr 1fr;
  }
}
.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.7;
  max-width: 360px;
  color: oklch(1 0 0 / 0.6);
}
.footer-logo {
  margin-bottom: var(--space-4);
}
.footer-nav h4 {
  font-size: var(--text-sm);
  font-weight: 600;
  color: #ffffff;
  margin-bottom: var(--space-4);
  letter-spacing: 0.03em;
}
.footer-nav ul {
  list-style: none;
  padding: 0;
}
.footer-nav li {
  margin-bottom: var(--space-2);
}
.footer-nav a {
  font-size: var(--text-sm);
  color: oklch(1 0 0 / 0.6);
  text-decoration: none;
}
.footer-nav a:hover {
  color: #ffffff;
}
.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid oklch(1 0 0 / 0.12);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-copyright {
  font-size: var(--text-xs);
  color: oklch(1 0 0 / 0.5);
}
.footer-attribution a {
  font-size: var(--text-xs);
  color: oklch(1 0 0 / 0.4);
  text-decoration: none;
}
.footer-attribution a:hover {
  color: oklch(1 0 0 / 0.7);
}

/* ========================================
   MOBILE RESPONSIVE
   ======================================== */
@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-divider);
    flex-direction: column;
    padding: var(--space-4);
    box-shadow: var(--shadow-md);
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav a {
    padding: var(--space-3) var(--space-4);
    width: 100%;
  }
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .header-inner {
    position: relative;
  }
  .hero h1 {
    font-size: clamp(1.75rem, 1.2rem + 2.5vw, 3rem);
  }
  .credentials-inner {
    gap: var(--space-6);
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   SCROLL ANIMATIONS
   ======================================== */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========================================
   EDIT HINTS (for placeholder content)
   ======================================== */
.edit-hint {
  display: none; /* hidden by default; set to inline for dev mode */
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-style: italic;
  background: var(--color-accent-light);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
}