/* ============================================================
   Base styles: typography, body texture, utilities, primitives
   used by the design system (sections 4.3–4.5 of TZ.md).
   ============================================================ */

/* ---------------- Body & felt texture ---------------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  color: var(--color-text-primary);
  background-color: var(--color-bg-deep);
  background-image:
    radial-gradient(ellipse at 20% 0%,  rgba(29, 74, 52, 0.45),  transparent 55%),
    radial-gradient(ellipse at 80% 100%, rgba(13, 40, 24, 0.55), transparent 60%),
    repeating-linear-gradient(
      135deg,
      rgba(255, 255, 255, 0.012) 0 2px,
      transparent 2px 4px
    ),
    linear-gradient(180deg, var(--color-bg-deep) 0%, var(--color-felt) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---------------- Headings (Playfair Display) ---------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--fw-bold);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}

h1 { font-size: var(--fs-56); font-weight: var(--fw-black); }
h2 { font-size: var(--fs-40); }
h3 { font-size: var(--fs-32); }
h4 { font-size: var(--fs-24); }
h5 { font-size: var(--fs-20); }
h6 { font-size: var(--fs-18); }

@media (max-width: 639.98px) {
  h1 { font-size: var(--fs-40); }
  h2 { font-size: var(--fs-32); }
  h3 { font-size: var(--fs-24); }
}

/* ---------------- Paragraphs, links, quotes ---------------- */
p {
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 70ch;
}
p + p { margin-top: var(--space-12); }

a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-gold-light); text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
  border-radius: var(--radius-4);
}

blockquote {
  margin: var(--space-24) 0;
  padding: var(--space-16) var(--space-24);
  border-left: 4px solid var(--color-gold);
  background: var(--color-gold-soft);
  border-radius: 0 var(--radius-8) var(--radius-8) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}
blockquote cite {
  display: block;
  margin-top: var(--space-8);
  font-size: var(--fs-14);
  color: var(--color-text-muted);
  font-style: normal;
}

ul, ol {
  padding-left: var(--space-24);
  color: var(--color-text-secondary);
}
li + li { margin-top: var(--space-4); }

hr {
  border: 0;
  height: 1px;
  background: var(--color-divider);
  margin: var(--space-32) 0;
}

code, pre, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}
code {
  background: var(--color-bg-secondary);
  padding: 0.125em 0.4em;
  border-radius: var(--radius-4);
  color: var(--color-gold-light);
}

::selection {
  background: var(--color-gold);
  color: var(--color-text-inverse);
}

/* ============================================================
   Design-system primitives — buttons & form controls.
   These are foundational tokens-as-classes, used both in the
   styleguide and (later) by all section-5 components.
   ============================================================ */

/* ---------------- Buttons (5.8) ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  font-family: var(--font-body);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-16);
  line-height: 1;
  padding: var(--space-12) var(--space-24);
  border: 1px solid transparent;
  border-radius: var(--radius-8);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}
.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-gold-soft), 0 0 0 4px var(--color-gold);
}
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn.is-disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
  transform: none;
}

/* Sizes */
.btn-sm { font-size: var(--fs-14); padding: var(--space-8) var(--space-16); border-radius: var(--radius-4); }
.btn-lg { font-size: var(--fs-18); padding: var(--space-16) var(--space-32); }

/* Variants */
.btn-primary {
  background: linear-gradient(180deg, var(--color-gold-light), var(--color-gold));
  color: var(--color-text-inverse);
  border-color: var(--color-gold-dark);
}
.btn-primary:hover, .btn-primary.is-hover {
  background: linear-gradient(180deg, var(--color-gold), var(--color-gold-dark));
  box-shadow: var(--shadow-gold);
}

.btn-danger {
  background: linear-gradient(180deg, var(--color-red-light), var(--color-red));
  color: var(--color-text-primary);
  border-color: var(--color-red-dark);
  box-shadow: var(--shadow-red);
}
.btn-danger:hover, .btn-danger.is-hover {
  background: linear-gradient(180deg, var(--color-red), var(--color-red-dark));
}

.btn-ghost {
  background: transparent;
  color: var(--color-gold);
  border-color: var(--color-gold);
}
.btn-ghost:hover, .btn-ghost.is-hover {
  background: var(--color-gold-soft);
  color: var(--color-gold-light);
  border-color: var(--color-gold-light);
}

.btn-secondary {
  background: var(--color-bg-elevated);
  color: var(--color-text-primary);
  border-color: var(--color-border);
}
.btn-secondary:hover, .btn-secondary.is-hover {
  background: var(--color-bg-secondary);
  border-color: var(--color-divider);
}

.btn-link {
  background: transparent;
  color: var(--color-gold);
  border-color: transparent;
  padding-inline: 0;
}
.btn-link:hover, .btn-link.is-hover {
  color: var(--color-gold-light);
  text-decoration: underline;
}

/* ---------------- Form fields (5.9) ---------------- */
.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.form-label {
  font-size: var(--fs-14);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.4;
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-8);
  padding: var(--space-12) var(--space-16);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.form-input::placeholder,
.form-textarea::placeholder { color: var(--color-text-muted); }

.form-input:hover,
.form-select:hover,
.form-textarea:hover { border-color: var(--color-divider); }

.form-input:focus,
.form-select:focus,
.form-textarea:focus,
.form-input.is-focus,
.form-select.is-focus,
.form-textarea.is-focus {
  outline: none;
  border-color: var(--color-gold);
  box-shadow: 0 0 0 3px var(--color-gold-soft);
  background-color: var(--color-bg-elevated);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled,
.form-input.is-disabled,
.form-select.is-disabled,
.form-textarea.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--color-bg-primary);
}

.form-input.is-error,
.form-select.is-error,
.form-textarea.is-error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.18);
}

.form-input.is-success,
.form-select.is-success,
.form-textarea.is-success {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.18);
}

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

/* Custom select arrow (gold) */
.form-select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path fill='%23d4af37' d='M3.5 5.5 8 10l4.5-4.5z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px;
  padding-right: var(--space-48);
}

.form-message { font-size: var(--fs-14); line-height: 1.4; }
.form-message.is-error   { color: var(--color-error); }
.form-message.is-success { color: var(--color-success); }
.form-message.is-hint    { color: var(--color-text-muted); }

/* Checkbox & radio (custom) */
.form-check {
  display: inline-flex;
  align-items: center;
  gap: var(--space-12);
  cursor: pointer;
  user-select: none;
  color: var(--color-text-secondary);
  font-size: var(--fs-14);
}
.form-check input[type="checkbox"],
.form-check input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-secondary);
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-check input[type="checkbox"] { border-radius: var(--radius-4); }
.form-check input[type="radio"]    { border-radius: var(--radius-pill); }

.form-check input:hover { border-color: var(--color-gold); }

.form-check input:checked {
  background-color: var(--color-gold);
  border-color: var(--color-gold-dark);
}
.form-check input[type="checkbox"]:checked::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'><path d='M3.5 8.5 6.5 11.5 12.5 5.5' fill='none' stroke='%230d2818' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: center;
  background-size: 14px;
}
.form-check input[type="radio"]:checked::after {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: var(--radius-pill);
  background: var(--color-text-inverse);
}
.form-check input:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-gold-soft);
}
.form-check input:disabled,
.form-check.is-disabled input { opacity: 0.5; cursor: not-allowed; }
.form-check.is-disabled { cursor: not-allowed; opacity: 0.7; }

/* ============================================================
   Utility classes — spacing, radius, shadows.
   Section 4.4 / 4.5 of TZ.md.
   ============================================================ */

/* Margin top */
.u-mt-4   { margin-top: var(--space-4); }
.u-mt-8   { margin-top: var(--space-8); }
.u-mt-12  { margin-top: var(--space-12); }
.u-mt-16  { margin-top: var(--space-16); }
.u-mt-24  { margin-top: var(--space-24); }
.u-mt-32  { margin-top: var(--space-32); }
.u-mt-48  { margin-top: var(--space-48); }
.u-mt-64  { margin-top: var(--space-64); }

/* Margin bottom */
.u-mb-4   { margin-bottom: var(--space-4); }
.u-mb-8   { margin-bottom: var(--space-8); }
.u-mb-12  { margin-bottom: var(--space-12); }
.u-mb-16  { margin-bottom: var(--space-16); }
.u-mb-24  { margin-bottom: var(--space-24); }
.u-mb-32  { margin-bottom: var(--space-32); }
.u-mb-48  { margin-bottom: var(--space-48); }
.u-mb-64  { margin-bottom: var(--space-64); }

/* Padding */
.u-p-8    { padding: var(--space-8); }
.u-p-12   { padding: var(--space-12); }
.u-p-16   { padding: var(--space-16); }
.u-p-24   { padding: var(--space-24); }
.u-p-32   { padding: var(--space-32); }

/* Radius */
.u-radius-4    { border-radius: var(--radius-4); }
.u-radius-8    { border-radius: var(--radius-8); }
.u-radius-12   { border-radius: var(--radius-12); }
.u-radius-16   { border-radius: var(--radius-16); }
.u-radius-24   { border-radius: var(--radius-24); }
.u-radius-pill { border-radius: var(--radius-pill); }

/* Shadows */
.u-shadow-sm   { box-shadow: var(--shadow-sm); }
.u-shadow-md   { box-shadow: var(--shadow-md); }
.u-shadow-lg   { box-shadow: var(--shadow-lg); }
.u-shadow-gold { box-shadow: var(--shadow-gold); }
.u-shadow-red  { box-shadow: var(--shadow-red); }

/* Text helpers */
.u-text-primary   { color: var(--color-text-primary); }
.u-text-secondary { color: var(--color-text-secondary); }
.u-text-muted     { color: var(--color-text-muted); }
.u-text-gold      { color: var(--color-gold); }
.u-text-red       { color: var(--color-red); }
.u-text-center    { text-align: center; }
.u-text-display   { font-family: var(--font-display); }
.u-text-mono      { font-family: var(--font-mono); }

/* Visually hidden (for a11y) */
.u-visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}