/* ========================================================================== 
   Variables
   ========================================================================== */

:root {
  /* Colors */
  --color-bg: #f7f9fc;
  --color-surface: #ffffff;
  --color-text: #111827;
  --color-text-muted: #6b7280;

  --color-primary: #2563eb; /* professional blue */
  --color-primary-soft: #dbeafe;
  --color-primary-strong: #1d4ed8;

  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;

  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2933;
  --gray-900: #111827;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Georgia", "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

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

  --line-height-tight: 1.2;
  --line-height-snug: 1.35;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.12);
  --shadow-lg: 0 15px 35px rgba(15, 23, 42, 0.18);

  /* Transitions */
  --transition-fast: 120ms ease-out;
  --transition-normal: 180ms ease-out;
  --transition-slow: 240ms ease-out;
}

/* ========================================================================== 
   Reset / Normalize
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
}

html,
body,
h1,
 h2,
 h3,
 h4,
 h5,
 h6,
 p,
 figure,
 blockquote,
 dl,
 dd {
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

img,
video {
  height: auto;
}

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

button {
  border: none;
  background: none;
  padding: 0;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding: 0;
}

/* Remove default link styles where needed, will restyle below */
 a {
  text-decoration: none;
  color: inherit;
}

/* ========================================================================== 
   Base
   ========================================================================== */

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  background-color: var(--color-bg);
  color: var(--color-text);
}

main {
  min-height: 60vh;
}

p {
  margin-bottom: var(--space-4);
  /* comfortable line length */
  color: var(--color-text);
}

p + p {
  margin-top: var(--space-2);
}

small {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

strong {
  font-weight: 600;
}

/* Headings */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--gray-900);
}

h1 {
  font-size: clamp(2.25rem, 2.5vw, 3rem);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.875rem, 2vw, 2.25rem);
  line-height: var(--line-height-tight);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(1.5rem, 1.5vw, 1.875rem);
  line-height: var(--line-height-snug);
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

h4 {
  font-size: var(--font-size-xl);
  margin-top: var(--space-4);
  margin-bottom: var(--space-2);
}

h5 {
  font-size: var(--font-size-lg);
  margin-top: var(--space-3);
  margin-bottom: var(--space-1);
}

h6 {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

/* Links */

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-normal),
              text-decoration-color var(--transition-normal),
              background-color var(--transition-normal);
}

a:hover {
  color: var(--color-primary-strong);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Lists */

ul,
ol {
  padding-left: 1.5rem;
  margin-bottom: var(--space-4);
}

li + li {
  margin-top: 0.25rem;
}

/* ========================================================================== 
   Accessibility
   ========================================================================== */

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

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

/* Visually hidden but accessible */

.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;
}

/* ========================================================================== 
   Utilities
   ========================================================================== */

/* Layout containers */

.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  max-width: 1120px; /* comfortable width for business content */
}

@media (min-width: 1200px) {
  .container {
    max-width: 1200px;
  }
}

/* Flex helpers */

.flex {
  display: flex;
}

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

.flex-column {
  flex-direction: column;
}

.flex-row {
  flex-direction: row;
}

.flex-center {
  justify-content: center;
  align-items: center;
}

.flex-between {
  justify-content: space-between;
  align-items: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-sm {
  gap: var(--space-2);
}

.gap-md {
  gap: var(--space-4);
}

.gap-lg {
  gap: var(--space-6);
}

/* Grid helpers */

.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Align helpers */

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-2); }
.mt-md { margin-top: var(--space-4); }
.mt-lg { margin-top: var(--space-6); }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-2); }
.mb-md { margin-bottom: var(--space-4); }
.mb-lg { margin-bottom: var(--space-6); }

/* ========================================================================== 
   Components
   ========================================================================== */

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-normal),
              color var(--transition-normal),
              border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              transform var(--transition-fast);
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #ffffff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #1d4ed8, #1e40af);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-primary-strong);
  border-color: var(--color-primary-soft);
}

.btn-secondary:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-primary-strong);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-primary);
}

.btn-ghost:hover {
  background-color: rgba(37, 99, 235, 0.06);
  color: var(--color-primary);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

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

/* Inputs & form controls */

.input,
select,
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  background-color: #ffffff;
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  transition: border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              background-color var(--transition-normal);
}

.input::placeholder,
textarea::placeholder {
  color: var(--gray-400);
}

.input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary-soft);
}

.input[aria-invalid="true"] {
  border-color: var(--color-danger);
}

label {
  display: inline-block;
  margin-bottom: 0.35rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-700);
}

.field-description {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: 0.25rem;
}

/* Card */

.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-md);
}

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

.card-title {
  font-size: var(--font-size-xl);
  margin-bottom: 0.25rem;
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.card-body {
  font-size: var(--font-size-sm);
}

/* Tag / pill for categories like events, masterminds, etc. */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.15rem 0.55rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 500;
  background-color: var(--color-primary-soft);
  color: var(--color-primary-strong);
}

.badge-neutral {
  background-color: var(--gray-100);
  color: var(--gray-700);
}

/* Hero-style section helper for vibrant networking visuals */

.section-hero {
  padding: var(--space-16) 0 var(--space-12);
}

.section-default {
  padding: var(--space-12) 0;
}

.section-alt {
  padding: var(--space-12) 0;
  background: radial-gradient(circle at top left, #e0edff, transparent 55%),
              radial-gradient(circle at bottom right, #e0f2fe, transparent 55%),
              var(--color-bg);
}

/* Navigation basics (for a clean, professional top bar) */

.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--font-size-sm);
}

.nav-link {
  color: var(--gray-700);
  padding: 0.25rem 0;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #2563eb, #1d4ed8);
  transition: width var(--transition-normal);
}

.nav-link:hover {
  color: var(--gray-900);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-link-active {
  color: var(--gray-900);
}

.nav-link-active::after {
  width: 100%;
}

/* Footer basics */

.footer {
  padding: var(--space-8) 0;
  background-color: #020617;
  color: #e5e7eb;
}

.footer a {
  color: #e5e7eb;
}

.footer a:hover {
  color: #bfdbfe;
}

/* Responsive typography tweaks */

@media (max-width: 640px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .section-hero,
  .section-default,
  .section-alt {
    padding-top: var(--space-10);
    padding-bottom: var(--space-10);
  }
}