/* style.css — landing page for Irina Novikova */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fc;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-primary-light: #eef2ff;
  --color-accent: #06b6d4;
  --color-border: #e5e7eb;
  --color-success: #10b981;
  --color-error: #ef4444;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  --max-width: 960px;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Container */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-primary);
  text-decoration: none;
  background: var(--color-primary-light);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav a:hover,
.nav a:focus-visible {
  color: var(--color-primary);
}

/* Hero */
.hero {
  padding: 4rem 0 3rem;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-bg) 50%, #ecfeff 100%);
}

.hero-grid {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3rem;
}

.hero-content {
  flex: 1;
  max-width: 560px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img {
  width: 300px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  object-fit: cover;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s;
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-secondary:hover {
  background: var(--color-primary-light);
  transform: translateY(-1px);
}

/* Sections */
section {
  padding: 4rem 0;
}

section:nth-child(even) {
  background: var(--color-bg-alt);
}

section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 2rem;
  text-align: center;
  letter-spacing: -0.01em;
}

/* About */
.about-content {
  display: flex;
  gap: 2.5rem;
  align-items: start;
  max-width: 900px;
  margin: 0 auto;
}

.about-photo {
  flex-shrink: 0;
}

.about-photo img {
  width: 240px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  object-fit: cover;
}

.about-text {
  flex: 1;
  min-width: 0;
}

.about-text p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  list-style: none;
  margin-top: 2rem;
}

.about-highlights li {
  text-align: center;
  padding: 1.25rem 0.5rem;
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.about-highlights strong {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

/* Topics */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.topic-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.topic-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.topic-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius);
  margin-bottom: 1rem;
}

.topic-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.topic-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Formats */
.formats-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
}

.format-item {
  padding: 1.5rem;
  background: var(--color-bg);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.format-item h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.format-item p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* Subscribe */
.subscribe {
  text-align: center;
}

.subscribe-desc {
  color: var(--color-text-muted);
  max-width: 500px;
  margin: -1rem auto 1.5rem;
}

/* Forms */
.subscribe-form,
.contact-form {
  max-width: 500px;
  margin: 0 auto;
}

.subscribe-form {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.subscribe-form .form-group {
  flex: 1;
  min-width: 180px;
}

.form-group {
  margin-bottom: 1rem;
  width: 100%;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

input,
select,
textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
  appearance: none;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

select {
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5l5 5 5-5' stroke='%236b7280' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-message {
  margin-top: 1rem;
  font-size: 0.9rem;
  min-height: 1.5em;
}

.form-message.success {
  color: var(--color-success);
}

.form-message.error {
  color: var(--color-error);
}

/* Media / Materials */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  max-width: 900px;
  margin: 0 auto;
}

.media-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}

.media-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.media-card img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

/* Social */
.social .container {
  text-align: center;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  transition: all 0.2s;
}

.social-link:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

/* Footer */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer-attribution {
  margin-top: 0.25rem;
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 640px) {
  .hero {
    padding: 3rem 0 2rem;
  }

  .hero-grid {
    flex-direction: column-reverse;
    gap: 2rem;
  }

  .hero-photo img {
    width: 200px;
  }

  .hero-content {
    text-align: center;
  }

  .about-content {
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }

  .about-photo img {
    width: 180px;
  }

  section {
    padding: 2.5rem 0;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 300px;
  }

  .about-highlights {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .subscribe-form {
    flex-direction: column;
  }

  .subscribe-form .btn {
    width: 100%;
  }

  .nav {
    gap: 1rem;
  }

  .nav a {
    font-size: 0.85rem;
  }
}