/* ============================================================
   BASE.CSS — ClaudeMax Design System
   Copy to project public/css/ and override variables in brand.css
   ============================================================ */

/* --- DESIGN TOKENS (override per project in brand.css) --- */
:root {
  /* Brand colors — override in brand.css */
  --color-primary:       #0F2A47;    /* fallback: deep navy */
  --color-primary-light: #1a3d6b;
  --color-secondary:     #00B4D8;    /* fallback: cyan */
  --color-accent:        #E85D2A;    /* fallback: orange */
  --color-text:          #1a1a1a;
  --color-text-muted:    #6b7280;
  --color-bg:            #ffffff;
  --color-bg-soft:       #f9fafb;
  --color-border:        #e5e7eb;
  --color-success:       #16a34a;
  --color-warning:       #d97706;
  --color-error:         #dc2626;

  /* Typography — override in brand.css */
  --font-display:  'Inter', system-ui, sans-serif;
  --font-body:     'Inter', system-ui, sans-serif;
  --font-mono:     'JetBrains Mono', 'Fira Code', monospace;

  /* Type scale */
  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.875rem;   /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.25rem;    /* 20px */
  --text-2xl:  1.5rem;     /* 24px */
  --text-3xl:  1.875rem;   /* 30px */
  --text-4xl:  2.25rem;    /* 36px */
  --text-5xl:  3rem;       /* 48px */

  /* Spacing scale */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Layout */
  --container-sm:  640px;
  --container-md:  768px;
  --container-lg:  1024px;
  --container-xl:  1280px;
  --container-2xl: 1440px;

  /* Radii */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;
  --radius-xl:  16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:  0 4px 6px rgba(0,0,0,0.07);
  --shadow-lg:  0 10px 15px rgba(0,0,0,0.10);
  --shadow-xl:  0 20px 25px rgba(0,0,0,0.12);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;
}

/* --- RESET --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}
img, svg, video { display: block; max-width: 100%; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- LAYOUT --- */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container--sm  { max-width: var(--container-sm); }
.container--md  { max-width: var(--container-md); }
.container--lg  { max-width: var(--container-lg); }
.container--2xl { max-width: var(--container-2xl); }

section { padding-block: var(--space-20); }

/* --- TYPOGRAPHY --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}
h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }
p  { margin-bottom: var(--space-4); }
.text-muted  { color: var(--color-text-muted); }
.text-small  { font-size: var(--text-sm); }
.text-center { text-align: center; }
.text-uppercase { text-transform: uppercase; letter-spacing: 0.08em; font-size: var(--text-xs); font-weight: 600; }

/* --- NAV --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-4);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.nav__logo { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; }
.nav__logo img { height: 32px; width: auto; }
.nav__links { display: flex; align-items: center; gap: var(--space-6); list-style: none; }
.nav__links a { font-size: var(--text-sm); font-weight: 500; color: var(--color-text); transition: color var(--transition-fast); }
.nav__links a:hover { color: var(--color-primary); text-decoration: none; }
.nav__cta { display: flex; align-items: center; gap: var(--space-3); }

/* --- BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}
.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn--primary:hover { background: var(--color-primary-light); border-color: var(--color-primary-light); text-decoration: none; }
.btn--secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--secondary:hover { background: var(--color-primary); color: #fff; text-decoration: none; }
.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--text-base); }
.btn--sm { padding: var(--space-2) var(--space-4); font-size: var(--text-xs); }

/* --- HERO --- */
.hero {
  padding-block: var(--space-24);
  background: var(--color-bg);
}
.hero__eyebrow { color: var(--color-secondary); margin-bottom: var(--space-4); }
.hero__title { margin-bottom: var(--space-6); }
.hero__subtitle { font-size: var(--text-xl); color: var(--color-text-muted); max-width: 640px; margin-bottom: var(--space-8); }
.hero__actions { display: flex; gap: var(--space-4); flex-wrap: wrap; }

/* --- CARDS --- */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}
.card:hover { box-shadow: var(--shadow-md); }
.card__icon { width: 48px; height: 48px; margin-bottom: var(--space-4); }
.card__title { font-size: var(--text-lg); font-weight: 700; margin-bottom: var(--space-2); }
.card__body { color: var(--color-text-muted); font-size: var(--text-sm); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

/* --- STATS / NUMBERS --- */
.stat { text-align: center; }
.stat__number { font-family: var(--font-display); font-size: var(--text-5xl); font-weight: 800; color: var(--color-primary); line-height: 1; }
.stat__label  { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-2); }
.stat-row { display: flex; gap: var(--space-12); justify-content: center; flex-wrap: wrap; }

/* --- FORMS --- */
.form-group { margin-bottom: var(--space-4); }
.form-label { display: block; font-size: var(--text-sm); font-weight: 600; margin-bottom: var(--space-2); }
.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary), 0.1);
}
.form-textarea { min-height: 120px; resize: vertical; }

/* --- FOOTER --- */
.footer {
  background: var(--color-bg-soft);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-16);
}
.footer__inner { display: flex; gap: var(--space-12); flex-wrap: wrap; }
.footer__brand { flex: 1; min-width: 200px; }
.footer__brand img { height: 32px; margin-bottom: var(--space-4); }
.footer__tagline { font-size: var(--text-sm); color: var(--color-text-muted); }
.footer__nav { display: flex; gap: var(--space-12); flex-wrap: wrap; }
.footer__col h4 { font-size: var(--text-sm); font-weight: 700; margin-bottom: var(--space-4); }
.footer__col ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-3); }
.footer__col a { font-size: var(--text-sm); color: var(--color-text-muted); transition: color var(--transition-fast); }
.footer__col a:hover { color: var(--color-primary); text-decoration: none; }
.footer__bottom { margin-top: var(--space-12); padding-top: var(--space-6); border-top: 1px solid var(--color-border); font-size: var(--text-xs); color: var(--color-text-muted); }

/* --- UTILITIES --- */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.flex   { display: flex; }
.grid   { display: grid; }
.hidden { display: none; }
.mt-auto { margin-top: auto; }
.gap-4  { gap: var(--space-4); }
.gap-6  { gap: var(--space-6); }
.gap-8  { gap: var(--space-8); }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.rounded { border-radius: var(--radius-md); }

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-2xl); }
  .nav__links { display: none; } /* wire mobile menu in project JS */
  .hero { padding-block: var(--space-16); }
  section { padding-block: var(--space-12); }
  .stat-row { gap: var(--space-8); }
}
@media (max-width: 480px) {
  h1 { font-size: var(--text-3xl); }
  .container { padding-inline: var(--space-4); }
  .hero__actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}