/* ============================
   BCS Mechanical — Design Tokens
   ============================ */

:root, [data-theme="light"] {
  /* 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 */
  --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;

  /* Fonts */
  --font-display: 'Montserrat', 'Helvetica Neue', sans-serif;
  --font-body: 'Montserrat', 'Helvetica Neue', sans-serif;

  /* Surfaces — clean white/light gray */
  --color-bg:             #f5f5f7;
  --color-surface:        #ffffff;
  --color-surface-2:      #fafafa;
  --color-surface-offset: #eef0f3;
  --color-divider:        #d8dce2;
  --color-border:         #cdd2d9;

  /* Text */
  --color-text:           #111111;
  --color-text-muted:     #4a4a4a;
  --color-text-faint:     #8a8a8a;
  --color-text-inverse:   #ffffff;

  /* Primary — BCS Blue */
  --color-primary:        #1a6cb4;
  --color-primary-hover:  #155a96;
  --color-primary-active: #104878;

  /* Accent — BCS Red */
  --color-accent:         #d42030;
  --color-accent-hover:   #b81a28;
  --color-accent-active:  #9c1520;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

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

  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0.2 0.01 80 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.01 80 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.01 80 / 0.12);

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

[data-theme="dark"] {
  --color-bg:             #0a0a0a;
  --color-surface:        #141414;
  --color-surface-2:      #1c1c1c;
  --color-surface-offset: #181818;
  --color-divider:        #252525;
  --color-border:         #303030;

  --color-text:           #e8e8e8;
  --color-text-muted:     #a0a0a0;
  --color-text-faint:     #606060;
  --color-text-inverse:   #0a0a0a;

  --color-primary:        #4a9de0;
  --color-primary-hover:  #3b8cd0;
  --color-primary-active: #2d7bbf;

  --color-accent:         #e84050;
  --color-accent-hover:   #d43545;
  --color-accent-active:  #c02a3a;

  --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:             #0a0a0a;
    --color-surface:        #141414;
    --color-surface-2:      #1c1c1c;
    --color-surface-offset: #181818;
    --color-divider:        #252525;
    --color-border:         #303030;
    --color-text:           #e8e8e8;
    --color-text-muted:     #a0a0a0;
    --color-text-faint:     #606060;
    --color-text-inverse:   #0a0a0a;
    --color-primary:        #4a9de0;
    --color-primary-hover:  #3b8cd0;
    --color-primary-active: #2d7bbf;
    --color-accent:         #e84050;
    --color-accent-hover:   #d43545;
    --color-accent-active:  #c02a3a;
    --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);
  }
}

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

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

/* ============================
   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);
  z-index: 100;
  font-size: var(--text-sm);
  text-decoration: none;
}
.skip-link:focus { top: var(--space-2); }

/* ============================
   Header
   ============================ */

.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: oklch(from var(--color-bg) l c h / 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
  transition: box-shadow 0.3s ease;
}

.header--scrolled { box-shadow: var(--shadow-sm); }

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.header__logo-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.header__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.header__logo-sub {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.header__nav { display: flex; align-items: center; gap: var(--space-6); }

.header__nav a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
}
.header__nav a:hover { color: var(--color-text); }

.header__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  background: var(--color-accent);
  color: #fff;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  text-decoration: none;
}
.header__cta:hover { background: var(--color-accent-hover); }
.header__cta:active { background: var(--color-accent-active); }

.header__theme-toggle {
  color: var(--color-text-muted);
  padding: var(--space-2);
  border-radius: var(--radius-md);
}
.header__theme-toggle:hover { color: var(--color-text); background: var(--color-surface-offset); }

.header__mobile-toggle {
  display: none;
  color: var(--color-text);
  padding: var(--space-2);
}

/* ============================
   Hero
   ============================ */

.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    oklch(0.1 0 0 / 0.85) 0%,
    oklch(0.1 0 0 / 0.6) 50%,
    oklch(0.1 0 0 / 0.25) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 600px;
  padding-block: var(--space-16);
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}

.hero__badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: #ffffff;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
}

.hero__sub {
  font-size: var(--text-base);
  color: oklch(0.85 0 0);
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  text-decoration: none;
  min-height: 48px;
}

.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover { background: var(--color-accent-hover); }
.btn--primary:active { background: var(--color-accent-active); }

.btn--outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid oklch(1 0 0 / 0.3);
}
.btn--outline:hover { background: oklch(1 0 0 / 0.1); border-color: oklch(1 0 0 / 0.5); }

/* ============================
   Services
   ============================ */

.services {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.section-header {
  margin-bottom: var(--space-10);
}

.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr));
  gap: var(--space-5);
}

.service-card {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow var(--transition-interactive), transform var(--transition-interactive);
}
.service-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.service-card__icon {
  width: 36px;
  height: 36px;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

[data-theme="dark"] .service-card__icon {
  color: var(--color-primary);
}

.service-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.service-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ============================
   Why BCS
   ============================ */

.why-bcs {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-surface-offset);
}

.why-bcs__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: center;
}

.why-bcs__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.why-bcs__item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.why-bcs__item-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  border-radius: var(--radius-full);
}

[data-theme="dark"] .why-bcs__item-num {
  background: var(--color-accent);
  color: #fff;
}

.why-bcs__item h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.why-bcs__item p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.why-bcs__image {
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.why-bcs__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ============================
   Service Area
   ============================ */

.area {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
}

.area__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

.area__towns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2) var(--space-6);
  margin-top: var(--space-4);
}

.area__town {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
}

.area__town::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.area__cta {
  background: var(--color-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 300px;
}

.area__cta h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.area__cta p {
  font-size: var(--text-sm);
  color: oklch(0.85 0 0);
  margin-bottom: var(--space-6);
  max-width: 40ch;
}

.area__cta .btn--primary {
  align-self: flex-start;
}

/* ============================
   FAQ
   ============================ */

.faq {
  padding-block: clamp(var(--space-12), 8vw, var(--space-24));
  background: var(--color-surface-offset);
}

.faq__list {
  max-width: 800px;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq__item {
  background: var(--color-surface);
  border: 1px solid oklch(from var(--color-text) l c h / 0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition-interactive);
}

.faq__item[open] {
  box-shadow: var(--shadow-sm);
}

.faq__question {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  padding: var(--space-5) var(--space-6);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.faq__question::-webkit-details-marker { display: none; }

.faq__question::after {
  content: '+';
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text-faint);
  flex-shrink: 0;
  transition: transform var(--transition-interactive);
}

.faq__item[open] .faq__question::after {
  content: '\2212';
  color: var(--color-primary);
}

.faq__answer {
  padding: 0 var(--space-6) var(--space-5);
}

.faq__answer p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.faq__answer a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

.faq__answer a:hover {
  text-decoration: underline;
}

/* ============================
   Contact Form
   ============================ */

.contact-form-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
}

[data-theme="dark"] .contact-form-card {
  background: var(--color-surface-2);
}

.contact-form-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.contact-form-card__sub {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

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

.contact-form__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.contact-form__field label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.contact-form__field input,
.contact-form__field textarea {
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  outline: none;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.contact-form__field input::placeholder,
.contact-form__field textarea::placeholder {
  color: var(--color-text-faint);
}

.contact-form__field input:focus,
.contact-form__field textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15);
}

[data-theme="dark"] .contact-form__field input,
[data-theme="dark"] .contact-form__field textarea {
  background: var(--color-surface-offset);
}

.contact-form__field textarea {
  resize: vertical;
  min-height: 100px;
}

.contact-form__submit {
  align-self: flex-start;
  margin-top: var(--space-2);
  cursor: pointer;
  border: none;
}

.contact-form__submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.contact-form__submit svg {
  animation: cf-spin 1s linear infinite;
}

@keyframes cf-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.contact-form__status {
  font-size: var(--text-sm);
  min-height: 1.4em;
}

.contact-form__status--success {
  color: #16a34a;
}

[data-theme="dark"] .contact-form__status--success {
  color: #4ade80;
}

.contact-form__status--error {
  color: var(--color-accent);
}

.contact-form-card__email {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
}

.contact-form-card__email a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

.contact-form-card__email a:hover {
  text-decoration: underline;
}

/* ============================
   Footer
   ============================ */

.footer {
  background: #0d0d0d;
  color: #fff;
  padding-block: var(--space-12) var(--space-6);
}

[data-theme="dark"] .footer {
  background: #050505;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

.footer__brand-text {
  font-size: var(--text-sm);
  color: oklch(0.8 0 0);
  margin-top: var(--space-3);
  max-width: 36ch;
  line-height: 1.6;
}

[data-theme="dark"] .footer__brand-text {
  color: var(--color-text-muted);
}

.footer h4 {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  margin-bottom: var(--space-4);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__links a {
  font-size: var(--text-sm);
  color: oklch(0.75 0 0);
  text-decoration: none;
}
.footer__links a:hover { color: #fff; }

[data-theme="dark"] .footer__links a {
  color: var(--color-text-muted);
}
[data-theme="dark"] .footer__links a:hover {
  color: var(--color-text);
}

.footer__bottom {
  border-top: 1px solid oklch(1 0 0 / 0.15);
  padding-top: var(--space-4);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
  color: oklch(0.65 0 0);
}

[data-theme="dark"] .footer__bottom {
  border-top-color: var(--color-border);
  color: var(--color-text-faint);
}

.footer__bottom a {
  color: oklch(0.7 0 0);
  text-decoration: none;
}
.footer__bottom a:hover { color: #fff; }

[data-theme="dark"] .footer__bottom a {
  color: var(--color-text-muted);
}

/* Mobile nav (hidden by default) */
.mobile-nav {
  display: none;
}

/* ============================
   Mobile
   ============================ */

@media (max-width: 768px) {
  .header__nav { display: none; }
  .header__cta { display: none; }
  .header__theme-toggle { order: 1; }
  .header__mobile-toggle { display: block; order: 2; }

  .mobile-nav {
    display: flex;
    position: fixed;
    inset: 0;
    z-index: 60;
    background: var(--color-bg);
    display: flex;
    flex-direction: column;
    padding: var(--space-16) var(--space-6);
    gap: var(--space-4);
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .mobile-nav.open { transform: translateX(0); }
  .mobile-nav a {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-divider);
  }
  .mobile-nav__close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    color: var(--color-text);
    padding: var(--space-2);
  }

  .hero { min-height: 60vh; }
  .hero h1 { font-size: clamp(1.5rem, 1rem + 3vw, 2.5rem); }
  .hero__content { padding-block: var(--space-10); }

  .services__grid { grid-template-columns: 1fr; }

  .why-bcs__grid { grid-template-columns: 1fr; }
  .why-bcs__image { order: -1; }

  .area__content { grid-template-columns: 1fr; }

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

  .contact-form__row { grid-template-columns: 1fr; }
  .contact-form-card { padding: var(--space-6); }
}