/*
Theme Name: Systems Lab
Theme URI: https://example.com/systems-lab
Author: Group Web
Author URI: https://example.com
Description: A modern and minimal WordPress theme for software systems labs.
Version: 1.0.0
Requires at least: 6.4
Tested up to: 6.6
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: systems-lab
*/

:root {
  --sl-bg: #f4f7fb;
  --sl-surface: #ffffff;
  --sl-surface-soft: #eaf0f8;
  --sl-text: #152033;
  --sl-text-muted: #58657b;
  --sl-primary: #0d5bd6;
  --sl-primary-strong: #0847ae;
  --sl-accent: #ff7b2f;
  --sl-border: #dbe4f0;
  --sl-radius-lg: 20px;
  --sl-radius-md: 14px;
  --sl-shadow: 0 18px 42px rgba(16, 42, 87, 0.1);
  --sl-max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  background: radial-gradient(circle at 10% 0%, #e9f1ff 0%, var(--sl-bg) 45%), var(--sl-bg);
  color: var(--sl-text);
  line-height: 1.6;
}

a {
  color: var(--sl-primary);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--sl-primary-strong);
}

.wrap {
  width: min(100% - 2.5rem, var(--sl-max-width));
  margin: 0 auto;
}

.section {
  padding: 4rem 0;
}

.section-title {
  margin: 0 0 0.75rem;
  font-family: "Fraunces", "Iowan Old Style", serif;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  letter-spacing: -0.02em;
}

.section-intro {
  margin: 0;
  color: var(--sl-text-muted);
  max-width: 64ch;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: rgba(244, 247, 251, 0.88);
  border-bottom: 1px solid rgba(219, 228, 240, 0.8);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 76px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--sl-text);
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand img {
  height: 40px;
  width: auto;
}

.brand-mark {
  display: inline-grid;
  place-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--sl-primary), #2a9ae3);
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.site-nav ul {
  display: flex;
  gap: 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--sl-text);
  font-weight: 500;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--sl-border);
  border-radius: 10px;
  background: var(--sl-surface);
  padding: 0.45rem 0.7rem;
  font-size: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.72rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
}

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

.button.primary:hover,
.button.primary:focus-visible {
  background: var(--sl-primary-strong);
  color: #fff;
}

.button.secondary {
  background: #fff;
  border-color: var(--sl-border);
  color: var(--sl-text);
}

.hero {
  padding-top: 5.3rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  gap: 2rem;
  align-items: stretch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 999px;
  background: #e4edfd;
  color: var(--sl-primary-strong);
  padding: 0.35rem 0.8rem;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.hero h1 {
  margin: 1rem 0;
  font-family: "Fraunces", "Iowan Old Style", serif;
  line-height: 1.08;
  letter-spacing: -0.02em;
  font-size: clamp(2.15rem, 6vw, 4rem);
}

.hero p {
  margin: 0;
  color: var(--sl-text-muted);
  max-width: 62ch;
}

.hero-actions {
  margin-top: 1.55rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.hero-panel {
  background: linear-gradient(155deg, #0f4db0, #0f67da 55%, #1f86de);
  color: #fff;
  border-radius: var(--sl-radius-lg);
  padding: 1.4rem;
  box-shadow: var(--sl-shadow);
}

.hero-panel h3 {
  margin: 0;
  font-size: 1.05rem;
}

.metrics {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.metrics li {
  border-top: 1px solid rgba(255, 255, 255, 0.28);
  padding-top: 0.8rem;
}

.metric-number {
  display: block;
  font-size: 1.8rem;
  line-height: 1;
  font-weight: 700;
}

.card-grid {
  margin-top: 1.6rem;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: var(--sl-surface);
  border: 1px solid var(--sl-border);
  border-radius: var(--sl-radius-md);
  padding: 1.15rem;
}

.card h3,
.card h4 {
  margin: 0 0 0.45rem;
}

.card p {
  margin: 0;
  color: var(--sl-text-muted);
}

.card-meta {
  margin-top: 0.85rem;
  font-size: 0.9rem;
  color: var(--sl-text-muted);
}

.article-link {
  display: inline-flex;
  margin-top: 0.7rem;
  color: var(--sl-primary-strong);
  font-weight: 600;
}

.pills {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.pills li {
  padding: 0.42rem 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--sl-border);
  background: var(--sl-surface);
  color: var(--sl-text-muted);
  font-size: 0.92rem;
}

.sponsors-empty {
  margin-top: 1.5rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.1rem;
}

.news-date {
  color: var(--sl-text-muted);
  font-size: 0.85rem;
}

.cta-band {
  background: linear-gradient(125deg, #0e4cae, #0f67da 58%, #26a6dc);
  color: #fff;
  border-radius: var(--sl-radius-lg);
  padding: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.cta-band h2 {
  margin: 0;
  font-family: "Fraunces", "Iowan Old Style", serif;
}

.cta-band p {
  margin: 0.45rem 0 0;
  opacity: 0.92;
}

.cta-band .button.secondary {
  border-color: rgba(255, 255, 255, 0.45);
  background: transparent;
  color: #fff;
}

.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--sl-border);
  margin-top: 2.5rem;
}

.footer-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}

.footer-row p {
  margin: 0;
  color: var(--sl-text-muted);
  font-size: 0.92rem;
}

.content-shell {
  margin-top: 2rem;
  padding: 1.35rem;
  border-radius: var(--sl-radius-md);
  border: 1px solid var(--sl-border);
  background: var(--sl-surface);
}

.post-list {
  display: grid;
  gap: 1rem;
}

.entry-content,
.page-content {
  color: var(--sl-text);
}

.entry-content p,
.page-content p {
  margin-top: 0;
}

@media (max-width: 980px) {
  .hero-grid,
  .two-col {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cta-band {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 760px) {
  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    inset: 76px 1.25rem auto;
    border: 1px solid var(--sl-border);
    border-radius: 14px;
    background: #ffffff;
    padding: 0.95rem;
    box-shadow: var(--sl-shadow);
    display: none;
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0.65rem;
  }

  .site-nav .button {
    width: 100%;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 3rem 0;
  }
}