/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #f8f8f6;
  --color-surface: #ffffff;
  --color-primary: #1a3c5e;
  --color-accent: #2d7dd2;
  --color-text: #2c2c2c;
  --color-muted: #6b7280;
  --color-border: #e2e5ea;
  --font-base: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --max-width: 900px;
  --spacing-lg: 4rem;
  --spacing-md: 2rem;
  --spacing-sm: 1rem;
  --radius: 8px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 1rem;
}

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

a:hover {
  text-decoration: underline;
}

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

/* ===== Layout ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

section {
  padding: var(--spacing-lg) 0;
}

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

/* ===== Navigation ===== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem var(--spacing-sm);
  max-width: var(--max-width);
  margin: 0 auto;
}

.nav-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-links a {
  color: #cbd5e1;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: #ffffff;
  text-decoration: none;
}

/* Hamburger menu (mobile) */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #ffffff;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

/* ===== Hero ===== */
#hero {
  background-color: var(--color-primary);
  color: #ffffff;
  padding: calc(var(--spacing-lg) * 1.5) 0 var(--spacing-lg);
}

#hero .container {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.hero-tag {
  display: inline-block;
  background-color: rgba(255, 255, 255, 0.12);
  color: #a8c8f0;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  width: fit-content;
}

.hero-title {
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.hero-title span {
  color: #7ec8e3;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: #94a3b8;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: #1a5fa3;
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-outline:hover {
  background-color: rgba(255, 255, 255, 0.08);
  border-color: #ffffff;
  text-decoration: none;
}

/* ===== Section Headers ===== */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

.section-intro {
  color: var(--color-muted);
  max-width: 560px;
  margin-bottom: var(--spacing-md);
}

/* ===== Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

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

.service-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.07);
  border-color: var(--color-accent);
}

.service-icon {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.service-card h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.service-card p {
  font-size: 0.9rem;
  color: var(--color-muted);
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  align-items: start;
}

.about-text p {
  color: var(--color-muted);
  margin-bottom: var(--spacing-sm);
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: var(--spacing-sm);
}

.skill-tag {
  background-color: #e8f0fb;
  color: var(--color-primary);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.highlight-item {
  border-left: 3px solid var(--color-accent);
  padding-left: 1rem;
}

.highlight-item .number {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.highlight-item .label {
  font-size: 0.85rem;
  color: var(--color-muted);
}

/* ===== Contact ===== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  align-items: start;
}

.contact-info p {
  color: var(--color-muted);
  margin-bottom: var(--spacing-md);
}

.contact-details {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.contact-details li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--color-text);
}

.contact-details li .icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-group input,
.form-group textarea,
.form-group select {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  font-family: var(--font-base);
  font-size: 0.95rem;
  color: var(--color-text);
  background-color: var(--color-bg);
  width: 100%;
  transition: border-color 0.2s, box-shadow 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(45, 125, 210, 0.15);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* Success message */
.form-success {
  display: none;
  background-color: #ecfdf5;
  border: 1px solid #6ee7b7;
  border-radius: var(--radius);
  padding: 1rem;
  color: #065f46;
  font-size: 0.95rem;
  text-align: center;
}

/* Language switcher */
.nav-lang {
  color: #cbd5e1;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 4px;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}

.nav-lang:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
}

/* ===== Footer ===== */
footer {
  background-color: var(--color-primary);
  color: #94a3b8;
  text-align: center;
  padding: 1.5rem var(--spacing-sm);
  font-size: 0.85rem;
}

footer a {
  color: #7ec8e3;
}

/* ===== Responsive ===== */
@media (max-width: 700px) {
  :root {
    --spacing-lg: 2.5rem;
  }

  /* Mobile nav */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    padding: 0.5rem 0 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li a {
    display: block;
    padding: 0.6rem 1.25rem;
    font-size: 1rem;
  }

  /* About */
  .about-grid {
    grid-template-columns: 1fr;
  }

  .about-highlights {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .highlight-item {
    flex: 1 1 120px;
  }

  /* Contact */
  .contact-wrapper {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 400px) {
  .hero-actions {
    flex-direction: column;
  }

  .btn {
    text-align: center;
  }
}