/* ============================================================
   InternHub — Global Styles
   Brand: Dark premium startup aesthetic
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* --- CSS Variables (brand colors) --- */
:root {
  --bg:        #111318;
  --card:      #1A1D24;
  --primary:   #7C5CFF;
  --secondary: #A78BFA;
  --text:      #F5F7FA;
  --muted:     #8B8FA8;
  --border:    #2A2D38;
  --success:   #22C55E;
  --error:     #EF4444;
  --card-hover: #1F2330;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  height: 64px;
  background: rgba(17, 19, 24, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-links a {
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.15s, background 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--card);
}

.nav-cta {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  border-radius: 10px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  border: none;
  white-space: nowrap;
  font-family: inherit;
}

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

.btn-primary:hover {
  background: #6B4EE8;
  transform: translateY(-1px);
  box-shadow: 0 8px 25px rgba(124, 92, 255, 0.35);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(124, 92, 255, 0.05);
}

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

.btn-ghost:hover {
  color: var(--text);
  background: var(--card);
}

.btn-success {
  background: var(--success);
  color: #fff;
}

.btn-success:hover {
  background: #16A34A;
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: 1rem;
  border-radius: 12px;
}

.btn-sm {
  padding: 0.375rem 1rem;
  font-size: 0.8125rem;
  border-radius: 8px;
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover {
  border-color: rgba(124, 92, 255, 0.3);
  background: var(--card-hover);
}

/* ============================================================
   TAGS / BADGES
   ============================================================ */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.tag-purple { background: rgba(124, 92, 255, 0.15); color: var(--secondary); }
.tag-green  { background: rgba(34, 197, 94, 0.15);  color: var(--success); }
.tag-blue   { background: rgba(59, 130, 246, 0.15); color: #60A5FA; }
.tag-orange { background: rgba(249, 115, 22, 0.15); color: #FB923C; }
.tag-pink   { background: rgba(236, 72, 153, 0.15); color: #F472B6; }
.tag-yellow { background: rgba(234, 179, 8, 0.15);  color: #FACC15; }

/* ============================================================
   FORMS
   ============================================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
}

.form-label span {
  color: var(--muted);
  font-weight: 400;
}

.form-input,
.form-select,
.form-textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 1rem;
  color: var(--text);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color 0.15s, box-shadow 0.15s;
  width: 100%;
  outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--muted);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.15);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%238B8FA8' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

.form-select option {
  background: var(--card);
  color: var(--text);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* Checkbox group */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.checkbox-option {
  position: relative;
}

.checkbox-option input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.checkbox-option label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}

.checkbox-option input:checked + label {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(124, 92, 255, 0.1);
}

.checkbox-option label:hover {
  border-color: rgba(124, 92, 255, 0.4);
  color: var(--text);
}

/* ============================================================
   PAGE LAYOUT
   ============================================================ */
.page-wrapper {
  padding-top: 64px;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

/* ============================================================
   SECTION HEADERS
   ============================================================ */
.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
}

.section-desc {
  font-size: 1.0625rem;
  color: var(--muted);
  line-height: 1.7;
  max-width: 600px;
}

/* ============================================================
   GRADIENT TEXT
   ============================================================ */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 60%, #C4B5FD 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================================
   GLOW EFFECTS
   ============================================================ */
.glow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
  display: inline-block;
}

/* ============================================================
   AVATAR
   ============================================================ */
.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.avatar-lg {
  width: 72px;
  height: 72px;
  font-size: 1.5rem;
}

/* ============================================================
   DIVIDER
   ============================================================ */
.divider {
  height: 1px;
  background: var(--border);
  border: none;
  margin: 2rem 0;
}

/* ============================================================
   MOBILE HAMBURGER
   ============================================================ */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.2s;
}

/* ============================================================
   MOBILE NAV DRAWER
   ============================================================ */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 99;
}

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

.mobile-nav a {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.15s, background 0.15s;
}

.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--text);
  background: var(--bg);
}

/* ============================================================
   TOAST NOTIFICATION
   ============================================================ */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
  box-shadow: 0 20px 50px rgba(0,0,0,0.4);
  z-index: 200;
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  min-width: 280px;
  max-width: 480px;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast-icon {
  font-size: 1.25rem;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .nav-links,
  .nav-cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .container {
    padding: 0 1rem;
  }

  .section {
    padding: 3rem 0;
  }
}

@media (max-width: 480px) {
  .btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
  }
}