:root {
  --color-base: #fcfcfc;
  --color-surface: #f5f7fa;
  --color-accent: #6366f1;
  --color-text-primary: #111827;
  --color-text-body: #374151;
  --color-text-secondary: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-hover: rgba(99, 102, 241, 0.3);
  --gradient-accent: linear-gradient(135deg, #6366f1, #8b5cf6);
  --gradient-hero-glow: radial-gradient(ellipse at 50% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 60%);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(99, 102, 241, 0.1);
  --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.08);
  --primary: var(--color-base);
  --secondary: var(--color-surface);
  --secondary-strong: #ffffff;
  --accent: var(--color-accent);
  --accent-hover: #8b5cf6;
  --bg: #ffffff;
  --card-bg: #ffffff;
  --text: var(--color-text-body);
  --text-on-dark: var(--color-text-primary);
  --muted-on-dark: var(--color-text-secondary);
  --white: #ffffff;
  --border: var(--color-border);
  --radius: 14px;
  --shadow: var(--shadow-sm);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Open Sans", sans-serif;
  color: var(--text);
  background: var(--color-base);
  background-attachment: fixed;
  line-height: 1.7;
}
main {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}
main::before {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  top: -140px;
  height: 320px;
  background:
    radial-gradient(110% 100% at 50% 0%, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.03) 48%, transparent 70%),
    linear-gradient(180deg, rgba(148, 163, 184, 0.16), rgba(148, 163, 184, 0));
  border-radius: 0 0 50% 50% / 0 0 100% 100%;
  z-index: 0;
  pointer-events: none;
}
main::after {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -180px;
  height: 360px;
  background:
    radial-gradient(110% 100% at 50% 100%, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.02) 52%, transparent 72%),
    linear-gradient(0deg, rgba(148, 163, 184, 0.16), rgba(148, 163, 184, 0));
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 0;
  pointer-events: none;
}
main > * {
  position: relative;
  z-index: 1;
}
h1, h2, h3 {
  font-family: "Inter", sans-serif;
  line-height: 1.25;
  font-weight: 800;
  color: var(--text-on-dark);
}
h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); }
h3 { font-size: clamp(1.2rem, 2.4vw, 1.6rem); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1140px, 92%); margin: 0 auto; }
.section { padding: 3.5rem 0; }
.section + .section { border-top: 1px solid var(--border); }
.section-alt { background: var(--color-surface); }
.lead { font-size: 1.1rem; color: var(--muted-on-dark); }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent-hover); font-weight: 700; font-size: 0.82rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: #ffffff;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}
.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand {
  font-family: "Inter", sans-serif;
  font-weight: 800;
  color: var(--text-on-dark);
  font-size: 1.05rem;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.brand::before {
  content: "H";
  display: inline-grid;
  place-items: center;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 0.48rem;
  border: 0;
  color: #fff;
  background: var(--gradient-accent);
  font-size: 0.82rem;
  font-weight: 800;
}
.site-nav { display: flex; gap: 1rem; align-items: center; }
.site-nav a {
  padding: 0.42rem 0.7rem;
  border-radius: 8px;
  color: var(--color-text-secondary);
  font-weight: 600;
  position: relative;
  text-decoration: none;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.25rem;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}
.site-nav a.active, .site-nav a:hover { background: transparent; color: var(--text-on-dark); text-decoration: none; }
.site-nav a.active::after, .site-nav a:hover::after { transform: scaleX(1); }
.menu-toggle { display: none; border: 1px solid var(--border); background: #fff; color: var(--text-on-dark); border-radius: 8px; padding: 0.5rem 0.7rem; }

.hero {
  position: relative;
  overflow: hidden;
  padding: 5rem 0 4rem;
  background: var(--gradient-hero-glow);
}
.hero-wave-cluster {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero-wave-cluster .wave {
  position: absolute;
  left: -10%;
  right: -10%;
  border-radius: 50%;
  filter: blur(0.2px);
}
.hero-wave-cluster .wave-a {
  top: 10%;
  height: 230px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.04));
  border-radius: 44% 56% 53% 47% / 57% 52% 48% 43%;
  transform: rotate(-2deg);
}
.hero-wave-cluster .wave-b {
  top: 32%;
  height: 260px;
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.14), rgba(196, 181, 253, 0.08));
  border-radius: 52% 48% 41% 59% / 42% 56% 44% 58%;
  transform: rotate(1.5deg);
}
.hero-wave-cluster .wave-c {
  top: 56%;
  height: 250px;
  background: linear-gradient(90deg, rgba(196, 181, 253, 0.12), rgba(255, 255, 255, 0.03));
  border-radius: 58% 42% 55% 45% / 46% 61% 39% 54%;
  transform: rotate(-1deg);
}
.hero-wave-cluster .wave-d {
  top: 72%;
  height: 220px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.09), rgba(255, 255, 255, 0.02));
  border-radius: 47% 53% 62% 38% / 62% 43% 57% 38%;
  transform: rotate(2deg);
}
.hero::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: -170px;
  height: 340px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.08));
  border-radius: 48% 52% 0 0 / 100% 100% 0 0;
  z-index: 0;
}
.hero::after {
  content: "";
  position: absolute;
  left: -6%;
  right: -6%;
  bottom: -205px;
  height: 300px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border-radius: 50% 50% 0 0 / 100% 100% 0 0;
  z-index: 0;
}
.hero .container {
  position: relative;
  z-index: 2;
}
.hero-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 2rem; align-items: start; }
.hero-actions { margin-top: 1.2rem; display: flex; gap: 0.7rem; flex-wrap: wrap; }
.hero-title {
  font-size: clamp(2.3rem, 6.4vw, 5.2rem);
  line-height: 1.03;
  margin: 0.2rem 0 1rem;
  letter-spacing: -0.02em;
}
.hero-tags {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}
.hero-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 1.25rem;
  box-shadow: var(--shadow);
  color: var(--text);
}
.hero-card h2 {
  color: var(--text-on-dark);
  margin-top: 0.1rem;
}
.hero-card p { color: var(--text); }

.btn {
  border: 1px solid transparent;
  border-radius: 10px;
  padding: 0.65rem 1rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-block;
}
.btn-primary {
  background: var(--gradient-accent);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}
.btn-outline { border-color: var(--border); color: var(--accent); background: #ffffff; }
.btn:hover { opacity: 0.95; text-decoration: none; }

.section-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.section-head h2 .accent-text,
.section h2 .accent-text { color: var(--accent); }
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.post-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.post-card img { width: 100%; height: 190px; object-fit: cover; }
.post-body { padding: 1rem; }
.post-body h3,
.post-body p { color: var(--text); }
.post-body h3 { margin: 0.55rem 0; font-size: 1.1rem; }
.meta { color: var(--accent-hover); font-size: 0.9rem; margin: 0; display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
.inline-link { font-weight: 700; }

.category-grid { display: grid; grid-template-columns: repeat(5, minmax(120px, 1fr)); gap: 0.8rem; }
.category-card {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  text-align: center;
  font-weight: 700;
  color: var(--text);
}
.category-card:hover { border-color: var(--accent); text-decoration: none; color: var(--text-on-dark); }

.newsletter-card {
  background: var(--color-surface);
  color: var(--text);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}
.newsletter-form { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.newsletter-form input {
  border: 1px solid rgba(181, 192, 212, 0.35);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  min-width: 220px;
  color: var(--text-on-dark);
  background: #ffffff;
}
.newsletter-card .newsletter-form input { border-color: transparent; }

.about-preview { max-width: 800px; }
.social-section { max-width: 900px; }
.social-links-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 0.8rem;
  margin-top: 0.9rem;
}
.social-link-card {
  display: block;
  padding: 1rem 1.1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  font-weight: 700;
}
.social-link-card:hover {
  color: var(--text-on-dark);
  border-color: var(--accent);
  text-decoration: none;
}

.blog-controls { margin: 1.2rem 0 1.5rem; display: grid; gap: 0.8rem; }
.blog-controls input, .contact-form input, .contact-form textarea {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.72rem 0.85rem;
  font: inherit;
  color: var(--text-on-dark);
  background: #ffffff;
}
.filters { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.chip {
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
}
.chip.active { background: var(--gradient-accent); border-color: transparent; color: #ffffff; }
.chip-static { cursor: default; }
.blog-layout { display: grid; grid-template-columns: 2fr 1fr; gap: 1rem; }
.sidebar { position: sticky; top: 95px; align-self: start; }
.sidebar-block {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 0.85rem;
  color: var(--text);
}
.sidebar-block h2 {
  color: var(--text-on-dark);
}
.sidebar-block ul { margin: 0; padding-left: 1rem; }
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.ad-zone { min-height: 280px; display: grid; place-items: center; text-align: center; color: #6b7f97; }
.pagination { display: flex; gap: 0.4rem; margin-top: 1rem; flex-wrap: wrap; }
.page-btn {
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  border-radius: 8px;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
}
.page-btn.active { background: var(--gradient-accent); color: #ffffff; border-color: transparent; }
.empty { background: #ffffff; color: var(--text); border: 1px solid var(--border); border-radius: 10px; padding: 1rem; }

.content-page {
  max-width: 860px;
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.35rem;
  box-shadow: var(--shadow);
}
.content-page h1,
.content-page h2,
.content-page h3 {
  color: var(--text-on-dark);
}
.article-hero {
  width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 0.8rem 0 1.2rem;
  border: 1px solid var(--border);
}
.article-content {
  color: var(--text);
  max-width: 720px;
}
.article-content p,
.article-content li {
  color: var(--text);
}
.article-content code {
  font-family: "Fira Code", monospace;
  background: var(--color-surface);
  color: var(--text-on-dark);
  padding: 0.08rem 0.3rem;
  border-radius: 5px;
}
.article-content pre {
  background: var(--color-surface);
  color: var(--text-on-dark);
  border-radius: 10px;
  padding: 0.9rem;
  overflow-x: auto;
}
.article-content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}
.about-layout { display: grid; grid-template-columns: 230px 1fr; gap: 1.25rem; align-items: start; }
.profile-photo {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: conic-gradient(from 200deg, var(--primary), var(--secondary), var(--accent), var(--primary));
  border: 8px solid #fff;
  box-shadow: var(--shadow);
}
.contact-form { display: grid; gap: 0.8rem; margin: 1rem 0; }
.contact-form label { display: grid; gap: 0.4rem; }
.form-status {
  margin: 0.2rem 0 0;
  font-size: 0.95rem;
  color: var(--text);
}
.hp-field { position: absolute; left: -9999px; }
.legal { max-width: 900px; }

.site-footer { background: var(--color-surface); color: var(--text-secondary); padding-top: 2.2rem; }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.site-footer a { color: var(--text-secondary); display: block; margin: 0.35rem 0; }
.site-footer h3 { color: var(--text-on-dark); margin-top: 0; }
.footer-bottom {
  margin-top: 1.2rem;
  border-top: 1px solid var(--border);
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-bottom nav { display: flex; gap: 1rem; flex-wrap: wrap; }

.cookie-banner {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  max-width: 360px;
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  border-radius: 12px;
  padding: 0.8rem;
  z-index: 25;
  color: var(--text);
}

.roi-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  margin-top: 0.7rem;
}
.roi-form label {
  font-weight: 600;
  color: var(--text-on-dark);
  display: grid;
  gap: 0.35rem;
}
.roi-form label:nth-child(3),
.roi-form button {
  grid-column: 1 / -1;
}
.roi-form input {
  width: 100%;
  border-radius: 10px;
  border: 1px solid rgba(181, 192, 212, 0.28);
  background: #ffffff;
  color: var(--text-on-dark);
  padding: 0.62rem 0.72rem;
}
.roi-result {
  margin-top: 0.8rem;
  background: var(--color-surface);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 12px;
  padding: 0.8rem 0.9rem;
}
.roi-result p { margin: 0; color: var(--text); font-weight: 700; }
.roi-result strong { margin-top: 0.2rem; display: inline-block; font-size: 2rem; color: var(--text-on-dark); }
.roi-bars { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.5rem; margin-top: 0.85rem; }
.roi-bars span {
  height: 2rem;
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.9), rgba(196, 181, 253, 0.9));
}
.roi-bars span:nth-child(1) { height: 1.2rem; }
.roi-bars span:nth-child(2) { height: 1.5rem; }
.roi-bars span:nth-child(3) { height: 1.9rem; }
.roi-bars span:nth-child(4) { height: 2.2rem; }

@media (max-width: 980px) {
  .post-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .social-links-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  body { font-size: 16px; }
  .menu-toggle { display: inline-block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 4%;
    right: 4%;
    background: #ffffff;
    border: 1px solid rgba(203, 213, 225, 0.25);
    border-radius: 12px;
    padding: 0.6rem;
    flex-direction: column;
    align-items: stretch;
  }
  .site-nav.open { display: flex; }
  .post-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: 1fr 1fr; }
  .newsletter-card { flex-direction: column; align-items: stretch; }
  .about-layout { grid-template-columns: 1fr; }
  .profile-photo { width: 180px; height: 180px; }
  .hero-wave-cluster .wave-a { top: 14%; height: 190px; }
  .hero-wave-cluster .wave-b { top: 34%; height: 210px; }
  .hero-wave-cluster .wave-c { top: 58%; height: 210px; }
  .hero-wave-cluster .wave-d { top: 76%; height: 170px; }
}

/* Light Theme Color Overrides */
::selection { background: rgba(99, 102, 241, 0.2); color: var(--text-on-dark); }
* { scrollbar-color: var(--accent) var(--color-surface); }
::-webkit-scrollbar-track { background: var(--color-surface); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 999px; }

main::before {
  background:
    radial-gradient(110% 100% at 50% 0%, rgba(99, 102, 241, 0.09) 0%, rgba(99, 102, 241, 0.03) 48%, transparent 70%),
    linear-gradient(180deg, rgba(148, 163, 184, 0.08), rgba(148, 163, 184, 0));
}
main::after {
  background:
    radial-gradient(110% 100% at 50% 100%, rgba(99, 102, 241, 0.08) 0%, rgba(99, 102, 241, 0.02) 52%, transparent 72%),
    linear-gradient(0deg, rgba(148, 163, 184, 0.08), rgba(148, 163, 184, 0));
}
.site-header.is-scrolled { background: rgba(255, 255, 255, 0.8); backdrop-filter: blur(12px); }
.hero-wave-cluster .wave-a,
.hero-wave-cluster .wave-b,
.hero-wave-cluster .wave-c,
.hero-wave-cluster .wave-d { opacity: 0.45; }

.hero-card,
.post-card,
.category-card,
.social-link-card,
.sidebar-block,
.content-page,
.empty,
.cookie-banner {
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}
.hero-card h2,
.sidebar-block h2,
.content-page h1,
.content-page h2,
.content-page h3 { color: var(--text-on-dark); }

.post-card:hover,
.category-card:hover,
.social-link-card:hover,
.sidebar-block:hover,
.content-page:hover {
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-md);
}

.btn-primary {
  background: var(--gradient-accent);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}
.btn-outline {
  background: #ffffff;
  border-color: var(--border);
  color: var(--accent);
}
.btn:hover {
  transform: scale(1.01);
  box-shadow: var(--shadow-md);
}

.newsletter-card {
  background: var(--color-surface);
  color: var(--text);
  border: 1px solid var(--border);
}
.newsletter-form input,
.blog-controls input,
.contact-form input,
.contact-form textarea,
.roi-form input {
  background: #ffffff;
  color: var(--text-on-dark);
  border: 1px solid var(--border);
}
.newsletter-form input::placeholder,
.blog-controls input::placeholder,
.contact-form input::placeholder,
.contact-form textarea::placeholder,
.roi-form input::placeholder { color: var(--color-text-muted); }

.chip,
.page-btn {
  background: #ffffff;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.chip.active {
  background: var(--gradient-accent);
  color: #ffffff;
  border-color: transparent;
}
.page-btn.active {
  background: var(--gradient-accent);
  color: #ffffff;
}

.site-footer {
  background: var(--color-surface);
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}
.site-footer a { color: var(--text-secondary); }
.site-footer a:hover { color: var(--text-on-dark); }
.footer-bottom { border-top: 1px solid var(--border); }

.article-content code {
  background: var(--color-surface);
  color: var(--text-on-dark);
  border: 1px solid var(--border);
}
.article-content pre {
  background: var(--color-surface);
  color: var(--text-on-dark);
  border: 1px solid var(--border);
}

.ad-zone { color: var(--color-text-muted); }

@media (max-width: 700px) {
  .site-nav {
    background: #ffffff;
    border: 1px solid var(--border);
  }
}