/* =============================================
   PEERLINGO BLOG - styles.css
   ============================================= */

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

:root {
  --brand-primary: #4F46E5;
  --brand-primary-dark: #3730A3;
  --brand-primary-light: #EEF2FF;
  --brand-accent: #F59E0B;
  --brand-accent-dark: #D97706;
  --text-dark: #1E293B;
  --text-medium: #475569;
  --text-light: #94A3B8;
  --bg-white: #FFFFFF;
  --bg-light: #F8FAFC;
  --bg-warm: #FFFBEB;
  --border-light: #E2E8F0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --max-width: 1120px;
  --content-width: 720px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text-dark);
  background: var(--bg-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--brand-primary-dark); }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { line-height: 1.3; color: var(--text-dark); }
h1 { font-size: 2.25rem; font-weight: 800; letter-spacing: -0.02em; }
h2 { font-size: 1.625rem; font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: 1.25rem; font-weight: 600; }

/* ---------- Navigation ---------- */
.blog-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-light);
  padding: 0 1.5rem;
}
.blog-nav__inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.blog-nav__logo {
  display: flex; align-items: center; gap: 0.5rem;
  font-weight: 700; font-size: 1.25rem; color: var(--text-dark);
}
.blog-nav__logo span { color: var(--brand-primary); }
.blog-nav__links { display: flex; align-items: center; gap: 1.5rem; list-style: none; }
.blog-nav__links a { color: var(--text-medium); font-size: 0.9rem; font-weight: 500; }
.blog-nav__links a:hover { color: var(--brand-primary); }
.blog-nav__cta {
  display: inline-flex; align-items: center;
  padding: 0.5rem 1.25rem; background: var(--brand-accent);
  color: #FFF !important; font-weight: 600; font-size: 0.875rem;
  border-radius: 999px; transition: background 0.2s, transform 0.15s;
}
.blog-nav__cta:hover { background: var(--brand-accent-dark); transform: translateY(-1px); }

/* ---------- Blog Hero ---------- */
.blog-hero {
  background: linear-gradient(135deg, var(--brand-primary-light) 0%, var(--bg-warm) 100%);
  padding: 4rem 1.5rem 3rem; text-align: center;
}
.blog-hero h1 { font-size: 2.75rem; margin-bottom: 0.75rem; }
.blog-hero p { font-size: 1.125rem; color: var(--text-medium); max-width: 600px; margin: 0 auto; }

/* ---------- Post Grid ---------- */
.blog-section { max-width: var(--max-width); margin: 0 auto; padding: 3rem 1.5rem; }
.blog-section__title { margin-bottom: 2rem; padding-bottom: 0.75rem; border-bottom: 2px solid var(--brand-primary-light); }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 2rem; }

/* ---------- Post Card ---------- */
.post-card {
  background: var(--bg-white); border-radius: var(--radius);
  border: 1px solid var(--border-light); overflow: hidden;
  transition: box-shadow 0.25s, transform 0.2s;
}
.post-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.post-card__image { width: 100%; height: 200px; object-fit: cover; background: var(--bg-light); }
.post-card__image--placeholder {
  display: flex; align-items: center; justify-content: center;
  height: 200px; background: linear-gradient(135deg, var(--brand-primary-light), #FEF3C7); font-size: 3rem;
  overflow: hidden; position: relative;
}
.post-card__image--placeholder img {
  width: 100%; height: 100%; object-fit: cover; position: absolute; top: 0; left: 0;
}
.post-card__body { padding: 1.5rem; }
.post-card__tag {
  display: inline-block; padding: 0.2rem 0.75rem;
  background: var(--brand-primary-light); color: var(--brand-primary);
  font-size: 0.75rem; font-weight: 600; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 0.75rem;
}
.post-card__title { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.5rem; line-height: 1.4; }
.post-card__title a { color: var(--text-dark); }
.post-card__title a:hover { color: var(--brand-primary); }
.post-card__excerpt { color: var(--text-medium); font-size: 0.925rem; line-height: 1.6; margin-bottom: 1rem; }
.post-card__meta { display: flex; align-items: center; gap: 0.75rem; font-size: 0.8rem; color: var(--text-light); }
.coming-soon-badge {
  display: inline-block; padding: 0.2rem 0.75rem;
  background: #FEF3C7; color: #92400E;
  font-size: 0.75rem; font-weight: 600; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.03em;
}
.post-card--coming-soon { opacity: 0.85; cursor: default; }
.post-card--coming-soon:hover { transform: none; box-shadow: var(--shadow-sm); }

/* ---------- Featured Post ---------- */
.featured-post {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2.5rem;
  background: var(--bg-white); border-radius: var(--radius);
  border: 1px solid var(--border-light); overflow: hidden; margin-bottom: 3rem;
  transition: box-shadow 0.25s;
}
.featured-post:hover { box-shadow: var(--shadow-md); }
.featured-post__image {
  min-height: 360px; background: linear-gradient(135deg, var(--brand-primary-light), #FEF3C7);
  display: flex; align-items: center; justify-content: center; font-size: 5rem;
  overflow: hidden; position: relative;
}
.featured-post__img {
  width: 100%; height: 100%; object-fit: cover; position: absolute; top: 0; left: 0;
}
.featured-post__content { padding: 2.5rem 2.5rem 2.5rem 0; display: flex; flex-direction: column; justify-content: center; }
.featured-post__tag {
  display: inline-block; width: fit-content; padding: 0.25rem 0.75rem;
  background: var(--brand-accent); color: #FFF;
  font-size: 0.75rem; font-weight: 600; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 1rem;
}
.featured-post__title { font-size: 1.75rem; margin-bottom: 0.75rem; }
.featured-post__title a { color: var(--text-dark); }
.featured-post__title a:hover { color: var(--brand-primary); }
.featured-post__excerpt { color: var(--text-medium); font-size: 1rem; line-height: 1.7; margin-bottom: 1.25rem; }
.featured-post__read { display: inline-flex; align-items: center; gap: 0.35rem; font-weight: 600; font-size: 0.95rem; }

/* ---------- Waitlist Banner ---------- */
.waitlist-banner {
  background: linear-gradient(135deg, var(--brand-primary) 0%, var(--brand-primary-dark) 100%);
  padding: 3.5rem 1.5rem; text-align: center; color: #FFF;
}
.waitlist-banner__inner { max-width: 600px; margin: 0 auto; }
.waitlist-banner h2 { color: #FFF; font-size: 1.75rem; margin-bottom: 0.75rem; }
.waitlist-banner p { color: rgba(255,255,255,0.85); font-size: 1.05rem; margin-bottom: 1.5rem; }
.waitlist-form { display: flex; gap: 0.75rem; max-width: 460px; margin: 0 auto; }
.waitlist-form input[type="email"] {
  flex: 1; padding: 0.8rem 1.25rem;
  border: 2px solid rgba(255,255,255,0.3); border-radius: 999px;
  background: rgba(255,255,255,0.15); color: #FFF; font-size: 1rem;
  outline: none; transition: border-color 0.2s;
}
.waitlist-form input[type="email"]::placeholder { color: rgba(255,255,255,0.6); }
.waitlist-form input[type="email"]:focus { border-color: var(--brand-accent); }
.waitlist-form button {
  padding: 0.8rem 1.75rem; background: var(--brand-accent); color: #FFF;
  font-weight: 700; font-size: 1rem; border: none; border-radius: 999px;
  cursor: pointer; transition: background 0.2s, transform 0.15s; white-space: nowrap;
}
.waitlist-form button:hover { background: var(--brand-accent-dark); transform: translateY(-1px); }

/* ---------- Inline CTA ---------- */
.inline-cta {
  background: var(--bg-warm); border: 2px solid #FDE68A; border-radius: var(--radius);
  padding: 2rem; margin: 2.5rem 0; text-align: center;
}
.inline-cta h3 { margin-bottom: 0.5rem; }
.inline-cta p { color: var(--text-medium); margin-bottom: 1.25rem; font-size: 0.95rem; }
.inline-cta .btn {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.75rem 1.75rem; background: var(--brand-accent); color: #FFF;
  font-weight: 700; font-size: 0.95rem; border-radius: 999px;
  transition: background 0.2s, transform 0.15s;
}
.inline-cta .btn:hover { background: var(--brand-accent-dark); color: #FFF; transform: translateY(-1px); }

/* ---------- Post Page ---------- */
.post-header { max-width: var(--content-width); margin: 0 auto; padding: 3rem 1.5rem 0; text-align: center; }
.post-header__back { display: inline-flex; align-items: center; gap: 0.35rem; font-size: 0.875rem; color: var(--text-light); margin-bottom: 2rem; }
.post-header__back:hover { color: var(--brand-primary); }
.post-header__tag {
  display: inline-block; padding: 0.25rem 0.75rem;
  background: var(--brand-primary-light); color: var(--brand-primary);
  font-size: 0.75rem; font-weight: 600; border-radius: 999px;
  text-transform: uppercase; letter-spacing: 0.03em; margin-bottom: 1rem;
}
.post-header h1 { font-size: 2.5rem; margin-bottom: 1rem; max-width: 640px; margin-left: auto; margin-right: auto; }
.post-header__meta { color: var(--text-light); font-size: 0.9rem; margin-bottom: 2rem; }
.post-header__hero-image { width: 100%; max-width: var(--max-width); margin: 0 auto 2rem; padding: 0 1.5rem; }
.post-header__hero-image img { width: 100%; height: 400px; object-fit: cover; border-radius: var(--radius); }

/* ---------- Post Content ---------- */
.post-content { max-width: var(--content-width); margin: 0 auto; padding: 0 1.5rem 3rem; }
.post-content h2 { margin-top: 2.5rem; margin-bottom: 1rem; }
.post-content h3 { margin-top: 2rem; margin-bottom: 0.75rem; }
.post-content p { margin-bottom: 1.25rem; font-size: 1.05rem; color: var(--text-medium); }
.post-content ul, .post-content ol { margin-bottom: 1.25rem; padding-left: 1.5rem; }
.post-content li { margin-bottom: 0.5rem; font-size: 1.05rem; color: var(--text-medium); }
.post-content blockquote {
  border-left: 4px solid var(--brand-primary); padding: 1rem 1.5rem;
  margin: 1.5rem 0; background: var(--brand-primary-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic; color: var(--text-medium);
}
.post-content strong { color: var(--text-dark); }

/* ---------- Author Box ---------- */
.author-box {
  display: flex; align-items: center; gap: 1.25rem;
  padding: 1.5rem; background: var(--bg-light); border-radius: var(--radius); margin: 2.5rem 0;
}
.author-box__avatar {
  width: 64px; height: 64px; border-radius: 50%;
  background: var(--brand-primary-light);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; flex-shrink: 0;
}
.author-box__info h4 { font-size: 1rem; margin-bottom: 0.25rem; }
.author-box__info p { font-size: 0.875rem; color: var(--text-medium); margin: 0; }

/* ---------- Footer ---------- */
.blog-footer { background: var(--text-dark); color: rgba(255,255,255,0.7); padding: 3rem 1.5rem; }
.blog-footer__inner {
  max-width: var(--max-width); margin: 0 auto;
  display: flex; justify-content: space-between; align-items: start; gap: 2rem; flex-wrap: wrap;
}
.blog-footer__brand { max-width: 320px; }
.blog-footer__brand h3 { color: #FFF; margin-bottom: 0.5rem; }
.blog-footer__brand p { font-size: 0.9rem; line-height: 1.6; }
.blog-footer__links h4 { color: #FFF; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.75rem; }
.blog-footer__links ul { list-style: none; }
.blog-footer__links li { margin-bottom: 0.4rem; }
.blog-footer__links a { color: rgba(255,255,255,0.6); font-size: 0.9rem; }
.blog-footer__links a:hover { color: #FFF; }
.blog-footer__bottom { max-width: var(--max-width); margin: 2rem auto 0; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.1); text-align: center; font-size: 0.8rem; }

/* ---------- Image Placeholders ---------- */
.image-placeholder, .placeholder-inner {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  width: 100%; height: 100%; min-height: 300px;
  background: linear-gradient(135deg, var(--brand-primary-light), #FEF3C7);
  color: var(--text-light); font-size: 0.85rem; gap: 0.75rem;
}
.placeholder-inner span { font-size: 0.8rem; color: var(--text-light); text-align: center; padding: 0 1rem; }
.author-box__photo { width: 64px; height: 64px; border-radius: 50%; object-fit: cover; }

/* ---------- Blog Updates CTA ---------- */
.blog-updates-cta {
  text-align: center; padding: 3rem 1.5rem; margin-top: 2rem;
  background: var(--bg-light); border-radius: var(--radius);
  border: 1px solid var(--border-light);
}
.blog-updates-cta h3 { margin-bottom: 0.5rem; }
.blog-updates-cta p { color: var(--text-medium); margin-bottom: 1.25rem; font-size: 0.95rem; }
.blog-updates-cta .btn {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.75rem 1.75rem; background: var(--brand-accent); color: #FFF;
  font-weight: 700; font-size: 0.95rem; border-radius: 999px;
  transition: background 0.2s, transform 0.15s;
}
.blog-updates-cta .btn:hover { background: var(--brand-accent-dark); color: #FFF; transform: translateY(-1px); }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .blog-hero h1 { font-size: 2rem; }
  .post-header h1 { font-size: 1.75rem; }
  .featured-post { grid-template-columns: 1fr; }
  .featured-post__image { min-height: 220px; }
  .featured-post__content { padding: 1.5rem; }
  .waitlist-form { flex-direction: column; }
  .blog-nav__links { gap: 1rem; }
  .post-grid { grid-template-columns: 1fr; }
  .blog-footer__inner { flex-direction: column; }
}
@media (max-width: 480px) {
  .blog-nav__links .hide-mobile { display: none; }
}