/*
Theme Name: ResearchAI Theme
Theme URI: https://researchai.thewritingproject.me
Author: The Writing Project
Author URI: https://thewritingproject.me
Description: A professional academic writing and AI-assisted research platform theme. Clean, authoritative design for researchers, doctoral students, and academic professionals.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.7
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: researchai
*/

/* ─── RESET & BASE ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-ink: #1B1B1B;
  --color-ink-light: #4A4A4A;
  --color-ink-muted: #717171;
  --color-bg: #FFFFFF;
  --color-bg-warm: #FAFAF8;
  --color-bg-section: #F5F5F3;
  --color-accent: #2B4C7E;
  --color-accent-dark: #1E3A5F;
  --color-accent-light: #3D6BA8;
  --color-border: #E2E0DC;
  --color-border-light: #EEEDEA;
  --color-success: #2E7D4F;
  --color-error: #B33A3A;
  --font-display: 'Libre Baskerville', 'Georgia', serif;
  --font-body: 'Source Sans 3', 'Helvetica Neue', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --w-content: 720px;
  --w-wide: 1080px;
  --w-full: 1200px;
  --space-xs: 8px;
  --space-sm: 16px;
  --space-md: 24px;
  --space-lg: 40px;
  --space-xl: 64px;
  --space-2xl: 96px;
}

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

body {
  font-family: var(--font-body);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent-dark); }

/* ─── TYPOGRAPHY ─── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-ink);
  line-height: 1.3;
  font-weight: 700;
}
h1 { font-size: 2.25rem; letter-spacing: -0.02em; margin-bottom: var(--space-md); }
h2 { font-size: 1.625rem; letter-spacing: -0.01em; margin-bottom: var(--space-sm); }
h3 { font-size: 1.25rem; margin-bottom: var(--space-xs); }
h4 { font-size: 1.1rem; margin-bottom: var(--space-xs); }
p { margin-bottom: var(--space-sm); }

/* ─── LAYOUT ─── */
.container { max-width: var(--w-full); margin: 0 auto; padding: 0 var(--space-md); }
.container--narrow { max-width: var(--w-content); }
.container--wide { max-width: var(--w-wide); }

/* ─── HEADER ─── */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-sm) 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.site-logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.site-logo span { color: var(--color-accent); }

.nav-menu { display: flex; gap: var(--space-md); list-style: none; align-items: center; }
.nav-menu a {
  color: var(--color-ink-light);
  font-size: 0.9rem;
  font-weight: 500;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav-menu a:hover,
.nav-menu .current-menu-item a {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.nav-cta {
  background: var(--color-accent);
  color: #fff !important;
  padding: 8px 20px !important;
  border-radius: 4px;
  border-bottom: none !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--color-accent-dark); }

/* Mobile nav */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--color-ink); margin: 5px 0; transition: 0.3s; }

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
  }
  .nav-menu.active { display: flex; }
}

/* ─── HERO ─── */
.hero {
  padding: var(--space-2xl) 0;
  background: var(--color-bg-warm);
  border-bottom: 1px solid var(--color-border);
}
.hero__inner { max-width: var(--w-wide); margin: 0 auto; padding: 0 var(--space-md); }
.hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}
.hero h1 { font-size: 2.75rem; max-width: 680px; margin-bottom: var(--space-md); }
.hero__subtitle {
  font-size: 1.15rem;
  color: var(--color-ink-light);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}
.hero__actions { display: flex; gap: var(--space-sm); flex-wrap: wrap; }

@media (max-width: 768px) {
  .hero { padding: var(--space-xl) 0; }
  .hero h1 { font-size: 1.875rem; }
}

/* ─── BUTTONS ─── */
.btn {
  display: inline-block;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 4px;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-align: center;
}
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--color-accent); color: #fff; }
.btn--primary:hover { background: var(--color-accent-dark); color: #fff; }
.btn--secondary { background: transparent; color: var(--color-accent); border: 1.5px solid var(--color-accent); }
.btn--secondary:hover { background: var(--color-accent); color: #fff; }
.btn--large { padding: 14px 36px; font-size: 1rem; }

/* ─── SECTIONS ─── */
.section { padding: var(--space-2xl) 0; }
.section--alt { background: var(--color-bg-section); }
.section__header {
  text-align: center;
  max-width: var(--w-content);
  margin: 0 auto var(--space-xl);
}
.section__header p {
  color: var(--color-ink-light);
  font-size: 1.05rem;
  margin-top: var(--space-xs);
}
.section__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

/* ─── SERVICE CARDS ─── */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
@media (max-width: 768px) { .services-grid { grid-template-columns: 1fr; } }

.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-lg) var(--space-md);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.service-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px rgba(43,76,126,0.08);
}
.service-card__icon {
  width: 44px;
  height: 44px;
  background: var(--color-bg-section);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  font-size: 1.25rem;
}
.service-card h3 { font-family: var(--font-body); font-weight: 700; font-size: 1.05rem; }
.service-card p { color: var(--color-ink-light); font-size: 0.9rem; margin-top: var(--space-xs); }

/* ─── PIPELINE / PROCESS ─── */
.pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  position: relative;
}
@media (max-width: 768px) { .pipeline { grid-template-columns: 1fr; } }

.pipeline__step {
  text-align: center;
  padding: var(--space-md);
}
.pipeline__number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: var(--space-xs);
}
.pipeline__step h4 { font-family: var(--font-body); font-weight: 700; }
.pipeline__step p { font-size: 0.88rem; color: var(--color-ink-light); margin-top: 6px; }

/* ─── FEATURES LIST ─── */
.features-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg) var(--space-xl);
  max-width: var(--w-wide);
  margin: 0 auto;
}
@media (max-width: 768px) { .features-list { grid-template-columns: 1fr; } }

.feature-item h3 { font-family: var(--font-body); font-size: 1.05rem; font-weight: 700; }
.feature-item p { color: var(--color-ink-light); font-size: 0.92rem; margin-top: 4px; }

/* ─── TESTIMONIALS ─── */
.testimonial {
  max-width: var(--w-content);
  margin: 0 auto;
  text-align: center;
  padding: var(--space-xl) var(--space-md);
}
.testimonial blockquote {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-ink);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}
.testimonial cite {
  font-family: var(--font-body);
  font-style: normal;
  font-size: 0.9rem;
  color: var(--color-ink-muted);
}

/* ─── FORMS ─── */
.form-section {
  max-width: var(--w-content);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md);
}
.form-group { margin-bottom: var(--space-md); }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-ink);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-bg);
  color: var(--color-ink);
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(43,76,126,0.1);
}
.form-group textarea { min-height: 140px; resize: vertical; line-height: 1.6; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-md); }
@media (max-width: 600px) { .form-row { grid-template-columns: 1fr; } }

.form-note { font-size: 0.8rem; color: var(--color-ink-muted); margin-top: var(--space-sm); }
.form-success {
  background: #EDF7ED;
  border: 1px solid #C3E6C3;
  color: var(--color-success);
  padding: var(--space-sm) var(--space-md);
  border-radius: 4px;
  font-size: 0.95rem;
}

/* ─── PRICING / PACKAGES ─── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
@media (max-width: 768px) { .pricing-grid { grid-template-columns: 1fr; } }

.pricing-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: var(--space-lg) var(--space-md);
  text-align: center;
}
.pricing-card--featured {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(43,76,126,0.1);
  position: relative;
}
.pricing-card__badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 14px;
  border-radius: 20px;
}
.pricing-card h3 { font-family: var(--font-body); font-weight: 700; font-size: 1.1rem; }
.pricing-card__price {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-accent);
  margin: var(--space-sm) 0;
}
.pricing-card__price span { font-size: 0.85rem; color: var(--color-ink-muted); font-weight: 400; }
.pricing-card ul {
  list-style: none;
  text-align: left;
  margin: var(--space-md) 0;
  font-size: 0.9rem;
  color: var(--color-ink-light);
}
.pricing-card li {
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border-light);
}
.pricing-card li::before { content: "✓ "; color: var(--color-success); font-weight: 700; }

/* ─── FOOTER ─── */
.site-footer {
  background: var(--color-ink);
  color: rgba(255,255,255,0.7);
  padding: var(--space-xl) 0 var(--space-lg);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}
@media (max-width: 768px) { .footer-grid { grid-template-columns: 1fr; } }

.footer-brand { font-family: var(--font-display); font-size: 1.15rem; color: #fff; margin-bottom: var(--space-sm); }
.site-footer h4 { color: #fff; font-family: var(--font-body); font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: var(--space-sm); }
.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: rgba(255,255,255,0.6); font-size: 0.88rem; }
.site-footer a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}
@media (max-width: 768px) { .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; } }

/* ─── PAGE TEMPLATES ─── */
.page-hero {
  padding: var(--space-xl) 0;
  background: var(--color-bg-warm);
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}
.page-hero h1 { margin-bottom: var(--space-xs); }
.page-hero p { color: var(--color-ink-light); font-size: 1.05rem; }

.page-content {
  padding: var(--space-xl) 0;
  max-width: var(--w-content);
  margin: 0 auto;
}
.page-content h2 { margin-top: var(--space-lg); }
.page-content ul, .page-content ol { margin: var(--space-sm) 0 var(--space-sm) var(--space-md); }
.page-content li { margin-bottom: 6px; }

/* ─── BLOG ─── */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
@media (max-width: 768px) { .posts-grid { grid-template-columns: 1fr; } }

.post-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.post-card:hover { box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
.post-card__image { background: var(--color-bg-section); height: 180px; }
.post-card__body { padding: var(--space-md); }
.post-card__meta { font-size: 0.78rem; color: var(--color-ink-muted); font-family: var(--font-mono); margin-bottom: 8px; }
.post-card h3 { font-size: 1.05rem; font-family: var(--font-body); font-weight: 700; }
.post-card p { font-size: 0.88rem; color: var(--color-ink-light); margin-top: 6px; }

/* ─── UTILITIES ─── */
.text-center { text-align: center; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-lg { margin-bottom: var(--space-lg); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }