/* ===== CSS Variables ===== */

:root {

  --color-primary: #1a1a2e;

  --color-accent: #f0b90b;

  --color-bg: #f5f5f5;

  --color-card: #ffffff;

  --color-text: #1a1a2e;

  --color-text-light: #ffffff;

  --navbar-height: 56px;

  --max-width: 1200px;

  --card-radius: 8px;

  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.08);

}



/* ===== Global Reset ===== */

*,

*::before,

*::after {

  box-sizing: border-box;

  margin: 0;

  padding: 0;

}



html {

  font-size: 16px;

  -webkit-text-size-adjust: 100%;

}



body {

  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  background-color: var(--color-bg);

  color: var(--color-text);

  line-height: 1.5;

  min-height: 100vh;

  padding-top: var(--navbar-height);

}



a {

  color: inherit;

  text-decoration: none;

}



button {

  font-family: inherit;

  cursor: pointer;

  border: none;

  background: none;

}



img {

  max-width: 100%;

  height: auto;

  display: block;

}



/* ===== Navbar ===== */

.navbar {

  position: fixed;

  top: 0;

  left: 0;

  right: 0;

  height: var(--navbar-height);

  background-color: var(--color-primary);

  color: var(--color-text-light);

  z-index: 1000;

  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);

}



.navbar-inner {

  max-width: var(--max-width);

  height: 100%;

  margin: 0 auto;

  padding: 0 20px;

  display: flex;

  align-items: center;

  justify-content: space-between;

}



.logo {

  font-size: 1.25rem;

  font-weight: 700;

  color: var(--color-accent);

  letter-spacing: 0.02em;

  transition: opacity 0.2s;

}



.logo:hover {

  opacity: 0.85;

}



.navbar-actions {

  display: flex;

  align-items: center;

  gap: 10px;

}



/* ===== Buttons ===== */

.btn {

  display: inline-flex;

  align-items: center;

  justify-content: center;

  padding: 8px 16px;

  font-size: 0.875rem;

  font-weight: 600;

  border-radius: var(--card-radius);

  transition: opacity 0.2s, background-color 0.2s, border-color 0.2s;

  white-space: nowrap;

}



.btn:hover {

  opacity: 0.9;

}



.btn:active {

  opacity: 0.8;

}



.btn-primary {

  background-color: var(--color-accent);

  color: var(--color-primary);

}



.btn-secondary {

  background-color: var(--color-card);

  color: var(--color-text);

  border: 1px solid var(--color-text);

}



.btn-lang {

  min-width: 56px;

}



/* ===== Page Content Container ===== */

.app-content {

  max-width: var(--max-width);

  margin: 0 auto;

  padding: 20px;

  min-height: calc(100vh - var(--navbar-height) - 80px);

}



/* ===== Card ===== */

.card {

  background-color: var(--color-card);

  border-radius: var(--card-radius);

  box-shadow: var(--shadow-card);

  padding: 24px;

}



.page-placeholder {

  text-align: center;

}



.page-placeholder h1 {

  font-size: 1.5rem;

  margin-bottom: 12px;

  color: var(--color-primary);

}



.page-placeholder p {

  font-size: 1rem;

  color: #666;

}



.loading-text {

  color: #999;

}



/* ===== Footer ===== */

.app-footer {

  margin-top: auto;

  padding: 24px 20px;

}



.footer-inner {

  max-width: var(--max-width);

  margin: 0 auto;

  text-align: center;

}



.footer-text {

  font-size: 0.8125rem;

  color: #999;

}



/* ===== Responsive: Mobile ≤768px ===== */

@media (max-width: 768px) {

  .navbar-inner {

    padding: 0 12px;

  }



  .app-content {

    padding: 12px;

  }



  .navbar-actions {

    gap: 8px;

  }



  .btn {

    padding: 7px 12px;

    font-size: 0.8125rem;

  }



  .logo {

    font-size: 1.125rem;

  }



  .card {

    padding: 16px;

  }



  .app-footer {

    padding: 16px 12px;

  }

}