:root {
  --color-bg: #f4f5f7;
  --color-surface: #eceff3;
  --glass-bg: rgba(244, 245, 247, 0.82);
  --glass-surface: rgba(255, 255, 255, 0.58);
  --glass-section: rgba(255, 255, 255, 0.45);
  --glass-border: rgba(209, 213, 219, 0.7);
  --bg-image: url("../assets/background.jpg");
  --bg-overlay: rgba(255, 255, 255, 0.78);
  --bg-filter: brightness(1.08) contrast(0.82) saturate(0.9) blur(5px);
  --color-text: #1f2937;
  --color-text-muted: #4b5563;
  --color-accent: #d62828;
  --color-border: #d1d5db;
  --shadow-soft: 0 10px 30px rgba(17, 24, 39, 0.08);
  --radius: 12px;
  --transition: 180ms ease;
}

[data-theme="dark"] {
  --color-bg: #0a0f1a;
  --color-surface: #0f1724;
  --glass-bg: rgba(10, 15, 26, 0.85);
  --glass-surface: var(--color-surface);
  --glass-section: var(--color-surface);
  --glass-border: rgba(255, 255, 255, 0.08);
  --bg-image: url("../assets/background.jpg");
  --bg-overlay: rgba(10, 15, 26, 0.7);
  --bg-filter: brightness(0.55) contrast(0.9) saturate(0.8) blur(5px);
  --color-text: #e9f0ff;
  --color-text-muted: #9aacc2;
  --color-accent: #ff4d4f;
  --color-border: rgba(255, 255, 255, 0.08);
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
}

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

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(var(--bg-overlay), var(--bg-overlay)),
    var(--bg-image);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center;
  background-attachment: fixed;
  filter: var(--bg-filter);
  pointer-events: none;
  z-index: 0;
}

header, main, footer {
  position: relative;
  z-index: 1;
}

body::after {
  content: "";
  position: fixed;
  right: 6%;
  bottom: 6%;
  width: 520px;
  height: 520px;
  background: url("../assets/logo.png") center / contain no-repeat;
  opacity: 0;
  pointer-events: none;
  user-select: none;
  mix-blend-mode: soft-light;
  filter: grayscale(1) contrast(0.28) brightness(0.75);
  z-index: 0;
}

[data-theme="light"] body::after {
  opacity: 0.045;
  filter: grayscale(1) contrast(0.32) brightness(0.7) blur(1px);
}

[data-theme="dark"] body::after {
  opacity: 0.03;
  filter: grayscale(1) contrast(0.5) brightness(1.05);
}

h1, h2, h3 {
  font-family: "Montserrat", "Poppins", system-ui, sans-serif;
  margin: 0 0 0.4em;
  color: var(--color-text);
}

p {
  margin: 0 0 1em;
  color: var(--color-text-muted);
}

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

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

.top-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.logo.small {
  width: 30px;
  height: 30px;
  object-fit: contain;
}

[data-theme="light"] .logo {
  filter: brightness(0.4) contrast(1.15) saturate(0.9);
  mix-blend-mode: multiply;
}

[data-theme="dark"] .logo {
  filter: none;
  mix-blend-mode: normal;
}

.brand-name {
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
}

.nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav a {
  font-weight: 500;
  padding: 8px 10px;
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--color-accent);
  background: rgba(214, 40, 40, 0.08);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  width: 42px;
  height: 42px;
  justify-content: center;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  background: var(--color-text);
  border-radius: 3px;
  transition: transform var(--transition);
}

.theme-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 9px 12px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: rgba(214, 40, 40, 0.6);
  color: var(--color-accent);
}

.theme-icon {
  font-size: 14px;
}

main {
  padding: 0 24px 72px;
}

.hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
  align-items: center;
  padding: 64px 0 48px;
  position: relative;
}

.hero-text h1 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.subhead {
  font-size: 1.05rem;
  max-width: 460px;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition), border-color var(--transition);
}

.btn.primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 10px 20px rgba(214, 40, 40, 0.25);
}

.btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 26px rgba(214, 40, 40, 0.28);
}

.btn.primary:disabled,
.btn.primary.loading {
  cursor: not-allowed;
  opacity: 0.7;
  transform: none;
  box-shadow: none;
}

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

.btn.ghost:hover {
  background: rgba(214, 40, 40, 0.08);
  border-color: rgba(214, 40, 40, 0.45);
  color: var(--color-accent);
}

.hero-card {
  background: var(--color-surface);
  padding: 24px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  display: grid;
  gap: 18px;
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  border-left: 3px solid rgba(214, 40, 40, 0.5);
  padding-left: 28px;
}

.hero-highlight {
  padding: 16px;
  border-radius: 12px;
  background: rgba(214, 40, 40, 0.08);
  border: 1px solid rgba(214, 40, 40, 0.18);
  color: var(--color-text);
  font-weight: 600;
}

[data-theme="dark"] .hero-highlight {
  background: rgba(255, 77, 79, 0.12);
}

.hero-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.mini-card {
  padding: 14px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  transition: border-color var(--transition), transform var(--transition);
}

.mini-card:hover {
  border-color: rgba(214, 40, 40, 0.4);
  transform: translateY(-2px);
}

.label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}

.value {
  font-weight: 700;
  color: var(--color-text);
}

.section {
  padding: 48px 0;
}

[data-theme="light"] .section {
  background: var(--glass-section);
  backdrop-filter: blur(8px);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  box-shadow: 0 12px 28px rgba(17, 24, 39, 0.05);
  margin-top: 18px;
}

.section-header {
  max-width: 680px;
  margin-bottom: 28px;
  position: relative;
  padding-bottom: 8px;
}

.section-header::after {
  content: "";
  display: block;
  width: 58px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 4px;
  opacity: 0.65;
  margin-top: 12px;
}

.section-header h2 {
  font-size: 1.8rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
  border-top: 3px solid rgba(214, 40, 40, 0.35);
}

[data-theme="light"] .card {
  background: var(--glass-surface);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  box-shadow: 0 8px 22px rgba(17, 24, 39, 0.06);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 34px rgba(11, 28, 45, 0.16);
}

[data-theme="light"] .card:hover {
  box-shadow: 0 12px 26px rgba(17, 24, 39, 0.08);
}

[data-theme="dark"] .card:hover {
  box-shadow: 0 16px 34px rgba(0, 0, 0, 0.45);
}

.icon {
  width: 50px;
  height: 50px;
  padding: 10px;
  border-radius: 12px;
  background: rgba(214, 40, 40, 0.08);
  margin-bottom: 12px;
  color: var(--color-accent);
}

.icon svg {
  width: 100%;
  height: 100%;
}

.projects .cards.grid {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card-head p {
  margin-bottom: 0;
}

.muted {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-top: 10px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  align-items: start;
}

.contact-form {
  display: grid;
  gap: 14px;
  background: var(--color-surface);
  padding: 20px;
  border-radius: 14px;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-weight: 600;
  color: var(--color-text);
}

.contact-form input,
.contact-form textarea {
  padding: 12px;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font: inherit;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: rgba(214, 40, 40, 0.6);
  box-shadow: 0 0 0 3px rgba(214, 40, 40, 0.12);
}

.form-status {
  min-height: 18px;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.form-status.success {
  color: #0f9d58;
}

.form-status.error {
  color: #d62828;
}

.contact-info {
  display: grid;
  gap: 14px;
}

.info-block {
  background: var(--color-surface);
  padding: 16px;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 24px;
  border-top: 1px solid var(--color-border);
}

.footer-links {
  display: flex;
  gap: 12px;
}

.footer-links a {
  color: var(--color-text-muted);
  font-weight: 600;
}

.footer-links a:hover {
  color: var(--color-accent);
}

@media (max-width: 900px) {
  .nav {
    position: absolute;
    inset: 70px 16px auto 16px;
    padding: 12px;
    background: var(--glass-surface);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: 0 12px 28px rgba(17, 24, 39, 0.05);
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity var(--transition), transform var(--transition);
  }

  .nav.open {
    opacity: 1;
    pointer-events: all;
    transform: translateY(0);
  }

  .menu-toggle {
    display: inline-flex;
  }

  .theme-toggle {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .top-bar {
    padding: 14px 16px;
  }

  main {
    padding: 0 16px 64px;
  }

  .hero {
    padding: 44px 0 34px;
  }
}