/* ==========================================
   Frontier AI Consulting — Stylesheet
   Light theme default with manual dark toggle
   ========================================== */

/* ---- Light Theme Variables ---- */
:root {
  --color-bg: #ffffff;
  --color-surface: #f7f9fc;
  --color-primary: #003366;
  --color-accent: #004c99;
  --color-text: #1b1b1b;
  --color-muted: #555;
  --color-border: #e1e5ec;
  --color-btn-primary: #003366;
  --color-btn-primary-text: #ffffff;
  --color-btn-secondary-bg: #ffffff;
  --color-btn-secondary-text: #003366;
  --color-hero-gradient-start: #003366;
  --color-hero-gradient-end: #004c99;
  --color-card-bg: #f7f9fc;
  --shadow-card: 0 2px 6px rgba(0, 0, 0, 0.08);
}

/* ---- Global Base ---- */
html, body {
  margin: 0;
  padding: 0;
  font-family: "Inter", "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

main {
  padding: 0 1.5rem 3rem;
}

@media (min-width: 768px) {
  main {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }
}

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* ---------- NAVBAR ---------- */
nav.site-nav {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 0 rgba(0,0,0,0.02);
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 0;
}

nav.site-nav .nav-grid {
  display: grid;
  grid-template-columns: 160px 1fr 120px;
  align-items: center;
  min-height: 68px;
  padding: 0 16px;
}

nav.site-nav .brand img:not(.logo-wordmark) {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}

nav.site-nav .brand .logo-wordmark {
  width: 180px;
  height: auto;
  border-radius: 0;
  filter: drop-shadow(0 16px 30px rgba(0, 0, 0, 0.18));
}

nav.site-nav .links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
}

nav.site-nav .links a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: color 0.2s ease;
}

nav.site-nav .links a:hover {
  color: var(--color-primary);
}

nav.site-nav .nav-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
}

.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.menu-toggle:hover,
.menu-toggle:focus-visible {
  color: var(--color-primary);
  background-color: rgba(0, 0, 0, 0.04);
  outline: none;
}

/* ---------- Theme Toggle ---------- */
.theme-toggle {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 0;
  transition: color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  color: var(--color-primary);
  transform: rotate(15deg);
}

/* ---------- HERO ---------- */
header {
  text-align: center;
  color: #ffffff;
  padding: 4rem 1rem 5rem 1rem;
  background: linear-gradient(180deg, var(--color-hero-gradient-start) 0%, var(--color-hero-gradient-end) 100%);
}

header .hero-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

header .hero-brand .hero-logo {
  width: clamp(200px, 38vw, 260px);
  max-width: 100%;
  border-radius: 22px;
  background: #ffffff;
  border: 4px solid rgba(255, 255, 255, 0.95);
  padding: 0.7rem 1.7rem;
  box-shadow: 0 20px 42px rgba(10, 40, 90, 0.32);
}

header .hero-brand .hero-wordmark {
  font-weight: 800;
  font-size: clamp(1.65rem, 4.5vw, 2.25rem);
  letter-spacing: 0.08rem;
  text-align: center;
  line-height: 1.1;
  color: #ffffff;
  text-transform: uppercase;
}

header .hero-brand .hero-wordmark span {
  font-size: 0.9em;
  letter-spacing: 0.12rem;
}

header h1 {
  font-size: clamp(28px, 5vw, 44px);
  margin: 0.5rem 0 1rem 0;
  font-weight: 800;
}

header p {
  max-width: 700px;
  margin: 1rem auto 1.5rem;
  font-size: 1.1rem;
  line-height: 1.5;
}

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-block;
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  text-decoration: none;
  margin: 0.5rem;
  transition: all 0.2s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

.btn.primary {
  background: var(--color-btn-primary);
  color: var(--color-btn-primary-text);
  border: 1px solid var(--color-btn-primary);
}

.btn.secondary {
  background: var(--color-btn-secondary-bg);
  color: var(--color-btn-secondary-text);
  border: 1px solid var(--color-border);
}

.btn:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

/* ---------- SECTIONS ---------- */
section {
  text-align: center;
  padding: 3.5rem 1rem;
}

section h2 {
  font-size: 1.75rem;
  color: var(--color-primary);
  margin-bottom: 2rem;
  font-weight: 800;
}

/* ---------- BOOKINGS ---------- */
.booking-wrapper {
  max-width: 980px;
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  box-shadow: 0 18px 40px rgba(0, 51, 102, 0.12);
  padding: 2.5rem;
  text-align: left;
}

.booking-wrapper h3 {
  color: var(--color-primary);
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.35rem;
}

.booking-wrapper p {
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.booking-frame {
  position: relative;
  width: 100%;
  min-height: 720px;
  border: 0;
  border-radius: 16px;
  box-shadow: inset 0 0 0 1px rgba(0, 51, 102, 0.08);
}

.booking-support {
  margin-top: 1.5rem;
  font-size: 0.95rem;
  color: var(--color-muted);
}

/* ---------- SIGNUP FORM ---------- */
.signup-card {
  max-width: 760px;
  margin: 0 auto;
  text-align: left;
}

.signup-form {
  display: grid;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.signup-form label {
  font-weight: 600;
  color: var(--color-primary);
}

.signup-form input[type="email"],
.signup-form input[type="text"] {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  font-size: 1rem;
  background: #fff;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
}

.signup-form input[type="email"]:focus,
.signup-form input[type="text"]:focus {
  outline: 2px solid rgba(0, 76, 153, 0.25);
  border-color: var(--color-primary);
}

.signup-form .consent {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-muted);
}

.signup-form .consent input {
  margin-top: 0.2rem;
}

.signup-status {
  min-height: 1.2rem;
  font-size: 0.95rem;
  color: var(--color-muted);
}

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

/* ---------- GRID / CARDS ---------- */
.grid {
  display: grid;
  gap: 1.5rem;
}

.grid.cols-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ---------- ARTICLE LAYOUT ---------- */
.article-container {
  max-width: 760px;
  margin: 0 auto;
}

/* ---------- CONTACT GRID ---------- */
.grid.contact-card-grid {
  max-width: 960px;
  margin: 0 auto;
  grid-template-columns: repeat(2, minmax(320px, 1fr));
  justify-content: center;
  justify-items: stretch;
  align-items: stretch;
}

.grid.contact-card-grid > .card {
  margin: 0;
}

.contact-form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  width: 100%;
  align-items: stretch;
}

.contact-form-grid .form-field {
  min-width: 0;
}

.contact-form-grid .form-field-full {
  grid-column: 1 / -1;
}

.contact-form .form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form textarea,
.contact-form select {
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  font-size: 1rem;
  background: #fff;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.04);
  font-family: inherit;
  box-sizing: border-box;
}

.contact-form input[type="text"]:focus,
.contact-form input[type="email"]:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: 2px solid rgba(0, 76, 153, 0.25);
  border-color: var(--color-primary);
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-form select {
  min-height: 160px;
}

.contact-form .field-hint {
  margin-top: 0.35rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.contact-form .form-status {
  min-height: 1.2rem;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.card {
  background: var(--color-card-bg);
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  padding: 1.75rem 1.25rem;
  border: 1px solid var(--color-border);
}

.card h3 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-weight: 700;
}

/* ---------- TESTIMONIAL ---------- */
blockquote, .testimonial {
  font-style: italic;
  max-width: 600px;
  margin: 1.5rem auto;
  color: var(--color-muted);
}

/* ---------- FOOTER ---------- */
footer {
  background: var(--color-surface);
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: 2rem 1rem;
  font-size: 0.9rem;
}

footer .logo-footer img {
  display: block;
  margin: 0 auto 0.75rem;
}

footer .logo-footer .logo-wordmark {
  width: 220px;
  height: auto;
  border-radius: 0;
}

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

footer a:hover {
  text-decoration: underline;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 768px) {
  header { padding: 3rem 1rem; }
  header h1 { font-size: 1.8rem; }
  header .hero-brand { margin-bottom: 1.6rem; }
  header .hero-brand .hero-logo {
    width: clamp(180px, 60vw, 220px);
    padding: 0.6rem 1.4rem;
    border-width: 3px;
  }
  header .hero-brand .hero-wordmark { font-size: 1.5rem; }
  nav.site-nav.menu-open .links {
    align-items: center;
  }
  .booking-wrapper {
    padding: 1.75rem 1.4rem;
    border-radius: 16px;
  }
  .booking-frame {
    min-height: 620px;
    border-radius: 12px;
  }
  .grid.contact-card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  nav.site-nav .nav-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    gap: 12px 0;
  }

  nav.site-nav .links {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
    width: 100%;
    padding: 10px 16px 16px;
    margin-top: 4px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
    box-sizing: border-box;
  }

  nav.site-nav .links a {
    width: 100%;
    padding: 6px 0;
  }

  nav.site-nav.menu-open .links {
    display: flex;
  }

  nav.site-nav .nav-actions {
    gap: 8px;
    margin-left: auto;
  }

  .menu-toggle {
    display: inline-flex;
  }
}

/* ---------- DARK MODE MANUAL OVERRIDE ---------- */
html.dark-mode {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-primary: #66aaff;
  --color-accent: #3388ff;
  --color-text: #e6edf3;
  --color-muted: #9ba7b4;
  --color-border: #30363d;
  --color-btn-primary: #3388ff;
  --color-btn-primary-text: #ffffff;
  --color-btn-secondary-bg: #0d1117;
  --color-btn-secondary-text: #e6edf3;
  --color-hero-gradient-start: #001e40;
  --color-hero-gradient-end: #004c99;
  --color-card-bg: #161b22;
  --shadow-card: 0 2px 6px rgba(0, 0, 0, 0.6);
}

/* === Pagination === */
.pagination {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 2rem;
}

.pagination a {
  font-weight: 600;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 0.5rem 1rem;
  color: var(--color-primary);
  background: var(--color-surface);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.pagination a:hover {
  background: var(--color-primary);
  color: white;
}