/* ============================================================
   CSSLLC — Global Design System v2
   style.css | Dark editorial charcoal palette (per DESIGN.md)
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,400&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  /* Colors — Modern Blue & White light theme */
  --bg-primary:     #FFFFFF;
  --bg-secondary:   #F8FAFC;
  --bg-card:        #FFFFFF;
  --bg-card-hover:  #EFF6FF;
  --text-primary:   #0F172A;
  --text-secondary: #475569;
  --text-muted:     #64748B;
  --accent:         #1D4ED8;
  --accent-hover:   #1E40AF;
  --accent-light:   rgba(29, 78, 216, 0.08);
  --border:         #E2E8F0;
  --border-accent:  rgba(29, 78, 216, 0.3);
  --border-light:   #F1F5F9;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --fs-xs:   clamp(0.65rem,  1.4vw, 0.75rem);
  --fs-sm:   clamp(0.8rem,   1.8vw, 0.9rem);
  --fs-base: clamp(0.9rem,   2vw,   1rem);
  --fs-md:   clamp(1rem,     2.2vw, 1.125rem);
  --fs-lg:   clamp(1.1rem,   2.5vw, 1.25rem);
  --fs-xl:   clamp(1.2rem,   3vw,   1.5rem);
  --fs-2xl:  clamp(1.4rem,   3.5vw, 2rem);
  --fs-3xl:  clamp(1.8rem,   4vw,   2.5rem);
  --fs-4xl:  clamp(2.2rem,   5.5vw, 3.5rem);
  --fs-hero: clamp(2.4rem,   6.5vw, 5rem);

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 7rem;
  --section-py: clamp(4rem, 9vw, 7rem);

  /* Borders & Shape */
  --radius-sm:   4px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.28s ease;
  --transition-slow: 0.5s ease;

  /* Layout */
  --container-max: 1240px;
  --container-px:  clamp(1.25rem, 5vw, 2.5rem);
  --nav-height:    80px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--fs-base);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, textarea, select { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; }

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-px);
}

/* ---------- Section ---------- */
.section {
  padding-block: var(--section-py);
  position: relative;
}

.section-eyebrow {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.section-header {
  margin-bottom: var(--space-3xl);
}

.section-header.centered {
  text-align: center;
}

.section-header.centered .section-subtitle {
  margin-inline: auto;
}

.section-title {
  font-size: var(--fs-4xl);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.section-subtitle {
  font-size: var(--fs-md);
  color: var(--text-secondary);
  line-height: 1.75;
  max-width: 560px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-family);
  font-size: var(--fs-md);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-pill);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 1px solid transparent;
  line-height: 1;
}

.btn-primary {
  background-color: var(--accent);
  color: #FFFFFF;
  padding: 1rem 2.5rem;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(29, 78, 216, 0.25);
}

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

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
  padding: 1rem 2.5rem;
}

.btn-outline:hover {
  border-color: var(--accent-hover);
  background-color: var(--accent-light);
  color: var(--accent-hover);
  transform: translateY(-1px);
}

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

.btn svg { width: 17px; height: 17px; flex-shrink: 0; }

/* ---------- Scroll Reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-32px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal-left.visible { opacity: 1; transform: translateX(0); }

.reveal-right {
  opacity: 0;
  transform: translateX(32px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal-right.visible { opacity: 1; transform: translateX(0); }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: rgba(29, 78, 216, 0.25); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ---------- Selection ---------- */
::selection { background: rgba(29, 78, 216, 0.15); color: var(--text-primary); }

/* ---------- Focus ---------- */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- Modals ---------- */
.modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: clamp(12px, 4vh, 48px) var(--space-md);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.modal.is-open {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background-color: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  width: 100%;
  max-width: 480px;
  transform: translateY(20px) scale(0.98);
  transition: transform var(--transition-base);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.12);
}

.modal.is-open .modal-content {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
}

.modal-title {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.modal-body {
  font-size: var(--fs-md);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.modal-body a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.modal-body a:hover {
  color: var(--bg-primary);
  background-color: var(--accent);
  text-decoration: none;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
}