*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; -webkit-tap-highlight-color: transparent; scroll-behavior: smooth; }
body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--text-main);
  background-color: var(--bg-body);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, picture, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; -webkit-tap-highlight-color: transparent; }
button:disabled { cursor: not-allowed; opacity: 0.6; }
input, textarea, select { font: inherit; color: inherit; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-hover); }
h1, h2, h3, h4, h5, h6 { font-weight: var(--font-bold); line-height: 1.25; }
*:focus { outline: none; }
*:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }

/* BUTTONS */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--space-2); padding: 14px var(--space-5);
  font-size: var(--text-base); font-weight: var(--font-bold);
  line-height: 1; border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  user-select: none; white-space: nowrap;
}
.btn:active:not(:disabled) { transform: scale(0.98); }
.btn-primary { background-color: var(--color-primary); color: var(--text-inverse); }
.btn-primary:hover:not(:disabled) { background-color: var(--color-primary-hover); }
.btn-success { background-color: var(--color-success); color: var(--text-inverse); }
.btn-danger { background-color: var(--color-danger); color: var(--text-inverse); }
.btn-ghost { background-color: transparent; color: var(--color-primary); border: 1px solid var(--border-color); }
.btn-ghost:hover:not(:disabled) { background-color: var(--bg-hover); }
.btn-block { width: 100%; }
.btn.is-loading { position: relative; color: transparent; pointer-events: none; }
.btn.is-loading::after {
  content: ""; position: absolute; width: 18px; height: 18px;
  border: 2px solid var(--text-inverse); border-right-color: transparent;
  border-radius: 50%; animation: btn-spin 0.6s linear infinite;
}
@keyframes btn-spin { to { transform: rotate(360deg); } }

/* FORMS */
.form-field { display: flex; flex-direction: column; gap: var(--space-2); }
.form-label { font-size: var(--text-sm); font-weight: var(--font-semibold); color: var(--text-secondary); }
.form-label .required { color: var(--color-primary); }
.form-input {
  width: 100%; padding: 14px var(--space-4);
  font-size: var(--text-base); color: var(--text-main);
  background-color: var(--bg-input);
  border: 1px solid var(--border-color); border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus { outline: none; border-color: var(--color-primary); box-shadow: var(--shadow-focus); background-color: var(--bg-card); }
.form-input.is-invalid { border-color: var(--color-danger); }
.form-input:disabled { background-color: var(--bg-hover); color: var(--text-muted); cursor: not-allowed; }
select.form-input { appearance: none; padding-right: 42px; cursor: pointer; }
.form-error { font-size: var(--text-sm); color: var(--color-danger); padding: var(--space-2) var(--space-3); background-color: var(--color-danger-light); border-radius: var(--radius-sm); display: none; }
.form-error.is-visible { display: block; }

/* UTILITIES */
.container { width: 100%; max-width: var(--container-md); margin-inline: auto; padding-inline: var(--space-4); }
.text-center { text-align: center; }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-muted { color: var(--text-secondary); }
.text-danger { color: var(--color-danger); }
.text-success { color: var(--color-success); }
.fw-bold { font-weight: var(--font-bold); }
.mt-2 { margin-top: var(--space-2); } .mt-4 { margin-top: var(--space-4); } .mt-6 { margin-top: var(--space-6); }
.mb-2 { margin-bottom: var(--space-2); } .mb-4 { margin-bottom: var(--space-4); } .mb-6 { margin-bottom: var(--space-6); }
.flex { display: flex; } .flex-col { flex-direction: column; } .items-center { align-items: center; } .justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); } .gap-4 { gap: var(--space-4); }
.hidden { display: none !important; }

/* SPINNER */
.spinner { display: inline-block; width: 32px; height: 32px; border: 3px solid var(--border-color); border-top-color: var(--color-primary); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ACCESSIBILITY */
.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; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; } }