/* ==========================================================================
   style.css
   Main layout, header, footer, card, buttons, and content components.
   Depends on variables.css being loaded first.
   ========================================================================== */

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  font-family: inherit;
}

/* ---------------------------------- Site Header ---------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 248, 250, 0.85);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-header);
}

.header-inner {
  max-width: var(--max-width-page);
  margin: 0 auto;
  height: var(--header-height);
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--fw-bold);
  font-size: 16px;
  letter-spacing: var(--ls-tight);
  color: var(--color-text);
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: var(--fw-bold);
  box-shadow: 0 4px 10px -4px rgba(79, 70, 229, 0.5);
}

.brand-name {
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-7);
}

.nav-link {
  position: relative;
  font-size: var(--fs-nav);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  padding: var(--space-1) 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.nav-link:hover {
  color: var(--color-text);
}

.nav-link.is-active {
  color: var(--color-text);
}

.nav-link.is-active::after {
  width: 100%;
}

/* ---------------------------------- Page Layout ---------------------------------- */

.page {
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8) var(--space-5);
}

/* ------------------------------------- Card --------------------------------------- */

.card {
  width: 100%;
  max-width: var(--max-width-card);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-10);
}

/* ------------------------------------ Header ---------------------------------------- */

.card-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.title {
  margin: 0 0 var(--space-2);
  font-size: var(--fs-heading);
  font-weight: var(--fw-extrabold);
  letter-spacing: var(--ls-tight);
  line-height: var(--lh-tight);
  color: var(--color-text);
}

.subtitle {
  margin: 0;
  font-size: var(--fs-subtitle);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  letter-spacing: -0.005em;
}

/* -------------------------------- Gradient Preview ------------------------------------ */

.preview-wrap {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-7);
}

.preview {
  width: 100%;
  max-width: 420px;
  height: 240px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #4F46E5, #EC4899);
  box-shadow: var(--shadow-preview);
  position: relative;
  overflow: hidden;
}

.preview::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

/* ------------------------------------- Buttons ----------------------------------------- */

.actions {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: none;
  cursor: pointer;
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  letter-spacing: -0.005em;
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn-icon {
  font-size: 15px;
  line-height: 1;
}

.btn-primary {
  color: #FFFFFF;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  box-shadow: var(--shadow-btn-primary);
}

.btn-secondary {
  color: var(--color-text);
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-btn-secondary);
}

.btn-secondary.copied {
  color: #FFFFFF;
  background: var(--color-primary);
  border-color: var(--color-primary);
}

/* ------------------------------- Gradient Information ----------------------------------- */

.info {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-6);
}

.info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) 0;
}

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

.info-value {
  font-size: var(--fs-small);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  font-variant-numeric: tabular-nums;
}

.color-value {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 5px;
  border: 1px solid rgba(17, 24, 39, 0.08);
  font-style: normal;
}

.code-block {
  margin-top: var(--space-4);
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
}

.code-block pre {
  margin: 0;
  font-family: var(--font-family-mono);
  font-size: var(--fs-code);
  line-height: var(--lh-relaxed);
  color: #374151;
  white-space: pre;
}

/* ----------------------------------- Card Footer ------------------------------------------ */

.card-footer {
  text-align: center;
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.card-footer p {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
}

.card-footer .footer-email {
  margin-top: var(--space-1) !important;
  color: var(--color-text-muted) !important;
  font-size: 12.5px !important;
}

/* -------------------------------------- Site Footer ------------------------------------------ */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-8) var(--space-6);
  text-align: center;
}

.site-footer .footer-inner {
  max-width: var(--max-width-page);
  margin: 0 auto;
}

.site-footer p {
  margin: 0 0 var(--space-1);
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
}

.site-footer .footer-email {
  color: var(--color-text-muted);
  font-size: 12.5px;
}

.site-footer .footer-copyright {
  margin-top: var(--space-3);
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ----------------------------------------- Toast ---------------------------------------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: var(--space-8);
  background: var(--color-text);
  color: #FFFFFF;
  font-size: 13.5px;
  font-weight: var(--fw-semibold);
  padding: var(--space-3) var(--space-5);
  border-radius: 12px;
  box-shadow: var(--shadow-toast);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  z-index: 100;
}

.toast::before {
  content: "✓";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-success);
  font-size: 10px;
  font-weight: var(--fw-extrabold);
}