/* ========================================
   BODY — OFFSET FOR FIXED HEADER
======================================== */
body {
  padding-top: 80px;
}

@media screen and (max-width: 768px) {
  body {
    padding-top: 70px;
  }
}

/* ========================================
   HEADER
======================================== */
.header {
  position: fixed;
  width: 100%;
  padding: var(--sp-xs) 0;
  z-index: 1000;
  top: 0;
  background: transparent;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all 0.3s ease;
}

.header-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--sp-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-2xl);
}

/* ---- Logo ---- */
.auth-logo {
  color: var(--c-dark);
  text-decoration: none;
  font-size: var(--fs-lg);
}

.auth-logo .ai {
  color: var(--c-green-500);
  font-size: var(--fs-lg);
}

.main-logo.white {
  color: #FFFFFF;
}

/* ---- Nav ---- */
.nav {
  display: flex;
  align-items: center;
  gap: var(--sp-md);
}

.nav a {
  font-size: var(--fs-md);
  font-weight: 700;
  position: relative;
  text-transform: uppercase;
  padding: 8px 7px;
  border-radius: var(--r-sm);
  transition: background 0.2s ease, color 0.2s ease;
}

.nav a:hover {
  background: var(--c-page);
}

.nav a::after {
  display: none;
}

/* ---- Auth Button ---- */
.auth-button {
  font-size: var(--fs-md);
  font-weight: 700;
  padding: 10px 22px;
  background-color: transparent;
  border: 2px solid var(--c-green-500);
  color: var(--c-green-500);
  text-transform: uppercase;
  border-radius: var(--r-sm);
  transition: background 0.25s ease, color 0.25s ease, transform 0.2s ease;
  cursor: pointer;
}

.auth-button:hover {
  background-color: var(--c-green-500);
  color: #000;
  transform: translateY(-1px);
}

/* ---- Menu Toggle (hidden on desktop) ---- */
.menu-toggle {
  display: none;
}

/* ---- Header Responsive ---- */
@media screen and (max-width: 1200px) {
  .header-container {
    padding: 0 var(--sp-lg);
    gap: var(--sp-xl);
  }
}

@media screen and (max-width: 992px) {
  .header-container {
    padding: 0 var(--sp-md);
    gap: var(--sp-lg);
  }
}

@media screen and (max-width: 768px) {
  .header-container {
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
  }

  .auth-logo {
    justify-content: space-between;
  }

  .menu-toggle {
    display: flex;
    width: 30px;
    height: 30px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
  }

  .menu-toggle i {
    font-size: 24px;
    color: var(--c-dark);
  }

  .nav {
    display: none;
    position: fixed;
    top: 40px;
    left: 0;
    right: 0;
    background: var(--c-surface);
    padding: 20px;
    flex-direction: column;
    gap: 15px;
    box-shadow: var(--shadow-md);
    z-index: 999;
  }

  .nav.active {
    display: flex;
  }

  .nav a {
    padding: 10px;
    width: 100%;
    text-align: center;
    border-radius: var(--r-sm);
    color: var(--c-dark);
    font-weight: 700;
  }

  .nav a:hover {
    background: var(--c-green-50);
  }

  .auth-button {
    margin-top: 10px;
    width: 100%;
  }
}

@media screen and (max-width: 480px) {
  .header-container {
    padding: 0 var(--sp-xs);
    gap: var(--sp-sm);
  }

  .auth-logo {
    font-size: var(--fs-md);
  }

  .auth-logo .ai {
    font-size: var(--fs-md);
  }
}