/* ============================================================
   Sweden IT Events – Main Stylesheet
   ============================================================ */

/* ---------- CSS Variables (Design Tokens) ---------- */
:root {
  --color-primary: #006AA7;       /* Swedish blue */
  --color-primary-dark: #004f7c;
  --color-primary-light: #e8f4fc;
  --color-accent: #FECC00;        /* Swedish yellow */
  --color-accent-dark: #d4a900;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f9fc;
  --color-text: #1a1a2e;
  --color-text-muted: #5a6475;
  --color-border: #e2e8f0;
  --color-success: #2ecc71;
  --color-error: #e74c3c;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.75rem;
  --font-size-5xl: 3.5rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);

  --transition: 0.2s ease;
  --container-max: 1180px;
  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary); }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; }

/* ---------- Layout Utility ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  font-weight: 600;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition),
              box-shadow var(--transition);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--color-accent);
  color: var(--color-text);
  border-color: var(--color-accent);
}
.btn-secondary:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-text);
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn-full { width: 100%; }

/* ---------- Header / Navigation ---------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow-md); }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
}
.logo-icon { font-size: 1.4rem; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding-bottom: 2px;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}
.nav-link:hover::after,
.nav-link.active::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Section Shared ---------- */
section { padding: 5rem 0; }
section:nth-child(even) { background: var(--color-bg-alt); }

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-tag {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: 0.3rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-description {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  line-height: 1.7;
}

/* ---------- Hero Section ---------- */
.hero {
  padding: calc(var(--header-height) + 4rem) 0 5rem;
  background: linear-gradient(135deg, #e8f4fc 0%, #fff8e1 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -120px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0,106,167,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -80px;
  left: -80px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(254,204,0,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.4rem 1rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.hero-title {
  font-size: clamp(var(--font-size-3xl), 6vw, var(--font-size-5xl));
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.hero-title-accent {
  color: var(--color-primary);
  position: relative;
}
.hero-title-accent::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--color-accent);
  border-radius: 2px;
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 3rem;
  flex-wrap: wrap;
  padding-top: 2rem;
  border-top: 1px solid rgba(0,0,0,0.08);
}

.stat { text-align: center; }
.stat-number {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
}
.stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ---------- Hero Section ---------- */
.hero {
  padding: 8rem 0 6rem;
  background: linear-gradient(135deg, #006AA7 0%, #004f7c 100%);
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(254, 204, 0, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(254, 204, 0, 0.08) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-description {
  font-size: var(--font-size-xl);
  line-height: 1.6;
  margin-bottom: 2.5rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-buttons .btn-primary {
  background: var(--color-accent);
  color: var(--color-text);
}

.hero-buttons .btn-primary:hover {
  background: var(--color-accent-dark);
}

.hero-buttons .btn-outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.3);
}

.hero-buttons .btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
  .hero {
    padding: 6rem 0 4rem;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .hero-description {
    font-size: var(--font-size-lg);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .hero-buttons .btn {
    width: 100%;
  }
}

/* ---------- Events Section ---------- */
.events { background: var(--color-bg); }

.event-filters {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-border);
  background: #fff;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.events-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.event-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}
.event-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.event-card-header {
  padding: 1.25rem 1.25rem 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.event-type-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.event-type-badge.meetup   { background: #e8f4fc; color: var(--color-primary); }
.event-type-badge.conference { background: #fff0f0; color: #c0392b; }
.event-type-badge.workshop  { background: #f0fff4; color: #27ae60; }

.event-date-chip {
  text-align: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.35rem 0.6rem;
  min-width: 48px;
}
.event-date-chip .day {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: 800;
  line-height: 1;
  color: var(--color-primary);
}
.event-date-chip .month {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.event-card-body { padding: 1rem 1.25rem; }
.event-card-body h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.event-card-body p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.event-card-footer {
  padding: 0.75rem 1.25rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--color-border);
  margin-top: 1rem;
}

.event-meta {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.event-meta span {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.event-register-btn {
  padding: 0.5rem 1.1rem;
  font-size: var(--font-size-sm);
}

.events-cta {
  text-align: center;
  padding: 2rem;
  background: var(--color-primary-light);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.events-cta p {
  font-size: var(--font-size-lg);
  font-weight: 500;
}

/* ---------- About Section ---------- */
.about { background: var(--color-bg-alt); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-content .section-title { text-align: left; }
.about-content .section-tag { display: inline-block; }

.about-content p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.about-values {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.value-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.value-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.value-item strong {
  display: block;
  font-weight: 600;
  margin-bottom: 0.2rem;
}
.value-item p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.5;
}

.about-visual {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.about-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
}
.about-card:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
}
.about-card-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.about-card h3 {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.about-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ---------- Team Section ---------- */
.team {
  background: var(--color-bg-alt);
  padding: 5rem 0;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.team-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--color-border);
}

.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.team-avatar {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-accent) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  margin: 0 auto 1.5rem;
}

.team-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}

.team-role {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

@media (max-width: 768px) {
  .team-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* ---------- Contact Section ---------- */
.contact { background: var(--color-bg); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}
.contact-icon { font-size: 1.5rem; flex-shrink: 0; }
.contact-item strong { display: block; font-weight: 600; margin-bottom: 0.25rem; }
.contact-item a,
.contact-item span {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}
.contact-item a:hover { color: var(--color-primary); }

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}
.social-links a {
  font-size: 0.8rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: all var(--transition);
}
.social-links a:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* Contact Form */
.contact-form {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 1.25rem;
}
.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--color-text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  background: #fff;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,106,167,0.12);
}
.form-group textarea { resize: vertical; min-height: 100px; }

.form-feedback {
  margin-top: 0.75rem;
  font-size: var(--font-size-sm);
  min-height: 1.25rem;
}
.form-feedback.success { color: var(--color-success); }
.form-feedback.error   { color: var(--color-error); }

/* ---------- Footer ---------- */
.footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.8);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  margin-bottom: 1.5rem;
}

.footer-brand .nav-logo {
  color: #fff;
  margin-bottom: 0.75rem;
}
.footer-brand p {
  font-size: var(--font-size-sm);
  line-height: 1.6;
  opacity: 0.7;
}

.footer-links h4 {
  color: #fff;
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
}
.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-links a {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}
.footer-links a:hover { color: #fff; }

.footer-bottom {
  text-align: center;
  font-size: var(--font-size-sm);
  opacity: 0.5;
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  :root { --header-height: 60px; }

  /* Nav */
  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: #fff;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-110%);
    transition: transform 0.3s ease;
    z-index: 999;
  }
  .nav-links.open { transform: translateY(0); }
  .nav-toggle { display: flex; }
  .nav-link { font-size: var(--font-size-base); }

  /* Hero */
  .hero { padding-top: calc(var(--header-height) + 2.5rem); }
  .hero-stats { gap: 1.5rem; }

  /* Grids */
  .about-grid,
  .contact-grid,
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .section-title { font-size: var(--font-size-2xl); }

  .events-cta { flex-direction: column; gap: 1rem; }
}

@media (max-width: 480px) {
  .btn { padding: 0.65rem 1.25rem; font-size: var(--font-size-sm); }
  .hero-actions { flex-direction: column; align-items: center; }
  .hero-stats { gap: 1rem; }
  section { padding: 3.5rem 0; }
}