/* ===== Custom Properties ===== */
:root {
  --primary: #005b9d;
  --accent: #00a8e1;
  --accent-light: rgba(0, 168, 225, 0.1);
  --gold: #fbb419;
  --gold-hover: #e5a317;
  --gold-light: rgba(251, 180, 25, 0.15);
  --bg: #f5f7fa;
  --surface: #ffffff;
  --text: #1a2332;
  --text-secondary: #5a6a7e;
  --text-light: #ffffff;
  --success: #48bb78;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-gold: 0 4px 20px rgba(251, 180, 25, 0.35);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s ease;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Bebas Neue', 'Impact', sans-serif;
  --max-width: 1200px;
}

/* ===== Dark Theme ===== */
[data-theme="dark"] {
  --bg: #0a1628;
  --surface: #111d32;
  --text: #e4e8ef;
  --text-secondary: #8a9bb5;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .header {
  background: rgba(10, 22, 40, 0.92);
  border-bottom-color: rgba(0, 168, 225, 0.1);
}

[data-theme="dark"] .header.scrolled {
  background: rgba(10, 22, 40, 0.97);
}

[data-theme="dark"] .header__logo {
  color: var(--accent);
}

[data-theme="dark"] .header__link:hover,
[data-theme="dark"] .header__link.active {
  color: var(--accent);
}

[data-theme="dark"] .header__burger span {
  background: var(--accent);
}

[data-theme="dark"] .hero {
  background: linear-gradient(135deg, var(--bg) 0%, rgba(0, 91, 157, 0.08) 50%, rgba(251, 180, 25, 0.06) 100%);
}

[data-theme="dark"] .hero__title {
  color: var(--accent);
}

[data-theme="dark"] .hero__bg-decor::before {
  background: radial-gradient(circle, rgba(251, 180, 25, 0.12) 0%, transparent 70%);
}

[data-theme="dark"] .hero__bg-decor::after {
  background: radial-gradient(circle, rgba(0, 168, 225, 0.1) 0%, transparent 70%);
}

[data-theme="dark"] .btn--primary {
  color: #1a2332;
}

[data-theme="dark"] .contact__title {
  color: var(--accent);
}

[data-theme="dark"] .contact__channel {
  background: var(--surface);
  border-color: rgba(0, 168, 225, 0.1);
}

[data-theme="dark"] .contact__form-wrapper {
  background: var(--surface);
  border-color: rgba(0, 168, 225, 0.08);
}

[data-theme="dark"] .form__input,
[data-theme="dark"] .form__textarea {
  background: var(--bg);
  border-color: rgba(0, 168, 225, 0.15);
  color: var(--text);
}

[data-theme="dark"] .form__input::placeholder,
[data-theme="dark"] .form__textarea::placeholder {
  color: rgba(138, 155, 181, 0.5);
}

[data-theme="dark"] .theme-toggle {
  border-color: rgba(0, 168, 225, 0.2);
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid rgba(0, 91, 157, 0.12);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

.theme-toggle__icon {
  width: 22px;
  height: 22px;
  color: var(--text);
  transition: color var(--transition);
}

.theme-toggle__sun { display: none; }

[data-theme="dark"] .theme-toggle__moon { display: none; }
[data-theme="dark"] .theme-toggle__sun { display: block; }

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

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

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
}

/* ===== Utility ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 91, 157, 0.08);
  transition: box-shadow var(--transition), background var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.97);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 1px;
  color: var(--primary);
  white-space: nowrap;
}

.header__logo img {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.header__link {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
}

.header__link:hover,
.header__link.active {
  color: var(--primary);
  background: var(--accent-light);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-xl);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--gold);
  color: var(--text);
  box-shadow: var(--shadow-gold);
}

.btn--primary:hover {
  background: var(--gold-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(251, 180, 25, 0.45);
}

.btn--primary:active {
  transform: translateY(0) scale(0.98);
}

.btn--large {
  padding: 16px 40px;
  font-size: 1.1rem;
}

.btn__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ===== Mobile Menu ===== */
.header__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  cursor: pointer;
}

.header__burger span {
  display: block;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 0;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg) 0%, rgba(0, 91, 157, 0.04) 50%, rgba(251, 180, 25, 0.04) 100%);
}

.hero__bg-decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero__bg-decor::before {
  content: '';
  position: absolute;
  top: -120px;
  right: -80px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(251, 180, 25, 0.08) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__bg-decor::after {
  content: '';
  position: absolute;
  bottom: -60px;
  left: -60px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(0, 168, 225, 0.06) 0%, transparent 70%);
  border-radius: 50%;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: 2px;
  color: var(--primary);
  margin-bottom: 20px;
}

.hero__title span {
  color: var(--gold);
}

.hero__subtitle {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Contact ===== */
.contact {
  padding: 140px 0 100px;
  min-height: 100vh;
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: start;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.contact__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--primary);
  letter-spacing: 1.5px;
}

.contact__desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.contact__channels {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact__channel {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--surface);
  border-radius: var(--radius-md);
  border: 1px solid rgba(0, 91, 157, 0.08);
  transition: all var(--transition);
}

.contact__channel:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.contact__channel-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: var(--radius-sm);
  color: var(--text-light);
  flex-shrink: 0;
}

.contact__channel-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.contact__channel-value {
  font-weight: 600;
  color: var(--text);
  margin-top: 2px;
}

/* ===== Form ===== */
.contact__form-wrapper {
  background: var(--surface);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(0, 91, 157, 0.06);
}

.form__title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 28px;
}

.form__group {
  margin-bottom: 20px;
}

.form__label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.form__input,
.form__textarea {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid rgba(0, 91, 157, 0.12);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form__input:focus,
.form__textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 168, 225, 0.15);
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: rgba(90, 106, 126, 0.5);
}

.form__textarea {
  resize: vertical;
  min-height: 140px;
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form__submit {
  width: 100%;
  margin-top: 8px;
}

.form__success {
  display: none;
  text-align: center;
  padding: 24px;
  color: var(--success);
  font-weight: 600;
}

.form__success.visible {
  display: block;
}

/* ===== Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }

/* ===== Welcome Page ===== */
.welcome-hero {
  position: relative;
  padding: 160px 0 60px;
  text-align: center;
  overflow: hidden;
}

.welcome-hero__bg {
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(0, 91, 157, 0.04) 0%, rgba(251, 180, 25, 0.06) 50%, rgba(0, 168, 225, 0.04) 100%);
  pointer-events: none;
}

.welcome-hero__content {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
}

.welcome-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--primary);
  letter-spacing: 1.5px;
  line-height: 1.1;
}

.welcome-hero__title span {
  color: var(--gold);
}

.welcome-step {
  padding: 60px 0;
}

.welcome-step__block {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.welcome-step__title {
  font-size: clamp(1.3rem, 3vw, 1.75rem);
  font-weight: 700;
  color: var(--text);
  margin-bottom: 28px;
}

.welcome-step__image {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 2px solid rgba(0, 91, 157, 0.1);
}

[data-theme="dark"] .welcome-hero__bg {
  background: linear-gradient(160deg, rgba(0, 91, 157, 0.08) 0%, rgba(251, 180, 25, 0.1) 50%, rgba(0, 168, 225, 0.08) 100%);
}

[data-theme="dark"] .welcome-hero__title {
  color: var(--accent);
}

[data-theme="dark"] .welcome-step__image {
  border-color: rgba(0, 168, 225, 0.15);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .header__nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--surface);
    flex-direction: column;
    padding: 24px;
    gap: 8px;
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }

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

  .header__burger {
    display: flex;
  }

  .header__burger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .header__burger.active span:nth-child(2) {
    opacity: 0;
  }

  .header__burger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .contact__grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .contact__form-wrapper {
    padding: 28px;
  }

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

  .welcome-hero {
    padding: 130px 0 40px;
  }

  .welcome-step {
    padding: 40px 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
    justify-content: center;
  }
}