/* ============================================================
   SPHRAGILLUM — The Imperial House of the Seal
   Visual System: Imperial Modern
   ============================================================ */

:root {
  /* Colour Palette */
  --imperial-ink: #171A20;
  --basalt: #343943;
  --aged-bronze: #A38C70;
  --ivory-stone: #E7E3D9;
  --verdigris: #718078;
  --imperial-oxblood: #8C3F43;

  /* Semantic */
  --bg-dark: var(--imperial-ink);
  --bg-light: var(--ivory-stone);
  --text-dark: var(--imperial-ink);
  --text-light: var(--ivory-stone);
  --accent: var(--aged-bronze);
  --muted: var(--verdigris);

  /* Typography */
  --font-display: "Cormorant Garamond", Georgia, "Times New Roman", serif;
  --font-body: "Manrope", system-ui, -apple-system, sans-serif;

  /* Spacing & rhythm */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* Motion */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration: 0.7s;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.65;
  color: var(--text-dark);
  background-color: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.25s var(--ease-out);
}

a:hover {
  color: var(--accent);
}

ul, ol {
  list-style: none;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 400;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.eyebrow {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.lead {
  font-size: 1.125rem;
  line-height: 1.7;
  max-width: 42rem;
}

/* Layout utilities */
.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.section {
  padding-block: var(--space-3xl);
}

.section--dark {
  background-color: var(--bg-dark);
  color: var(--text-light);
}

.section--basalt {
  background-color: var(--basalt);
  color: var(--text-light);
}

/* Header / Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(23, 26, 32, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(163, 140, 112, 0.15);
  transition: background 0.3s var(--ease-out);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ivory-stone);
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}

.logo svg {
  width: 36px;
  height: 36px;
}

.logo:hover {
  color: var(--accent);
}

.nav-primary {
  display: none;
  gap: 1.75rem;
}

.nav-primary a {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(231, 227, 217, 0.85);
  text-transform: uppercase;
}

.nav-primary a:hover,
.nav-primary a[aria-current="page"] {
  color: var(--accent);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--ivory-stone);
  transition: transform 0.3s var(--ease-out), opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile nav */
.nav-mobile {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--imperial-ink);
  border-bottom: 1px solid rgba(163, 140, 112, 0.2);
  padding: var(--space-md);
  flex-direction: column;
  gap: var(--space-sm);
}

.nav-mobile.open {
  display: flex;
}

.nav-mobile a {
  font-size: 0.9375rem;
  padding: 0.6rem 0;
  color: var(--ivory-stone);
  border-bottom: 1px solid rgba(163, 140, 112, 0.12);
}

@media (min-width: 900px) {
  .nav-primary {
    display: flex;
  }
  .nav-toggle {
    display: none;
  }
  .nav-mobile {
    display: none !important;
  }
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--bg-dark);
  color: var(--text-light);
  position: relative;
  overflow: hidden;
  padding-top: 4.5rem;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(163, 140, 112, 0.08) 0%, transparent 70%),
    linear-gradient(180deg, transparent 60%, var(--imperial-ink) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
  padding-block: var(--space-3xl);
}

.hero h1 {
  margin-bottom: var(--space-md);
  color: var(--ivory-stone);
}

.hero .lead {
  color: rgba(231, 227, 217, 0.85);
  margin-bottom: var(--space-lg);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s var(--ease-out);
}

.btn--primary {
  background: var(--aged-bronze);
  color: var(--imperial-ink);
  border-color: var(--aged-bronze);
}

.btn--primary:hover {
  background: transparent;
  color: var(--aged-bronze);
}

.btn--secondary {
  background: transparent;
  color: var(--ivory-stone);
  border-color: rgba(163, 140, 112, 0.5);
}

.btn--secondary:hover {
  border-color: var(--aged-bronze);
  color: var(--aged-bronze);
}

.btn--outline-dark {
  background: transparent;
  color: var(--imperial-ink);
  border-color: var(--imperial-ink);
}

.btn--outline-dark:hover {
  background: var(--imperial-ink);
  color: var(--ivory-stone);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration) var(--ease-out), transform var(--duration) var(--ease-out);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Principles grid */
.principles {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 700px) {
  .principles {
    grid-template-columns: repeat(2, 1fr);
  }
}

.principle {
  padding: var(--space-lg);
  border: 1px solid rgba(163, 140, 112, 0.25);
  background: rgba(23, 26, 32, 0.4);
}

.principle h3 {
  color: var(--accent);
  margin-bottom: var(--space-sm);
  font-size: 1.35rem;
}

.principle p {
  color: rgba(231, 227, 217, 0.8);
  font-size: 0.975rem;
}

/* Houses cards */
.houses-grid {
  display: grid;
  gap: var(--space-lg);
}

@media (min-width: 700px) {
  .houses-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.house-card {
  padding: var(--space-xl);
  background: var(--bg-light);
  border: 1px solid rgba(52, 57, 67, 0.12);
  transition: border-color 0.3s var(--ease-out), transform 0.3s var(--ease-out);
}

.house-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.house-card h3 {
  margin-bottom: 0.35rem;
}

.house-card .positioning {
  font-family: var(--font-display);
  font-style: italic;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.house-card p {
  color: var(--basalt);
  font-size: 0.95rem;
}

/* Section headers */
.section-header {
  margin-bottom: var(--space-xl);
  max-width: 40rem;
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

/* Footer */
.site-footer {
  background: var(--imperial-ink);
  color: rgba(231, 227, 217, 0.75);
  padding-block: var(--space-2xl) var(--space-lg);
  border-top: 1px solid rgba(163, 140, 112, 0.2);
}

.footer-grid {
  display: grid;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

@media (min-width: 700px) {
  .footer-grid {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

.footer-brand .logo {
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  font-size: 0.9rem;
  max-width: 22rem;
  line-height: 1.6;
}

.footer-nav h4 {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-nav a {
  font-size: 0.9rem;
  color: rgba(231, 227, 217, 0.8);
}

.footer-nav a:hover {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(163, 140, 112, 0.15);
  font-size: 0.8rem;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}

/* Page header (inner pages) */
.page-header {
  background: var(--bg-dark);
  color: var(--text-light);
  padding: calc(4.5rem + var(--space-2xl)) 0 var(--space-2xl);
}

.page-header h1 {
  margin-bottom: var(--space-sm);
}

.page-header .lead {
  color: rgba(231, 227, 217, 0.8);
}

/* Content pages */
.content-block {
  max-width: 42rem;
}

.content-block p + p {
  margin-top: var(--space-md);
}

.content-block h2 {
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.content-block h3 {
  margin-top: var(--space-lg);
  margin-bottom: var(--space-xs);
}

/* Contact form */
.contact-form {
  max-width: 36rem;
  display: grid;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 0.75rem 1rem;
  background: #fff;
  border: 1px solid rgba(52, 57, 67, 0.25);
  border-radius: 0;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

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

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.checkbox-group input {
  margin-top: 0.25rem;
}

.form-note {
  font-size: 0.85rem;
  color: var(--basalt);
  margin-top: var(--space-sm);
}

/* Utility */
.text-center {
  text-align: center;
}

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

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

.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;
}

/* Divider */
.divider {
  width: 48px;
  height: 1px;
  background: var(--accent);
  margin: var(--space-md) 0;
}

/* Placeholder notice */
.placeholder-notice {
  padding: var(--space-md);
  background: rgba(163, 140, 112, 0.08);
  border-left: 3px solid var(--accent);
  font-size: 0.9rem;
  color: var(--basalt);
  margin: var(--space-lg) 0;
}