/* ==== Apple-inspired Global Reset & Typography ==== */
:root {
  --apple-black: #0000;
  --apple-white: #ffff;
  --apple-grey-50: #f5f5f7;
  --apple-grey-100: #efeff4;  /* iOS group background */
  --apple-grey-200: #e5e5ea;
  --apple-grey-300: #d1d1d6;
  --apple-grey-600: #8e8e93;
  --apple-blue: #007aff;
  --apple-blue-hover: #0056cc;
  --apple-green: #34c759;
  --apple-red: #ff3b30;
  --shadow-soft: 0 8px 30px rgba(0,0,0,0.08);
  --radius-lg: 14px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --transition: all 0.3s ease;
  --text-color: #1d1d1f;
  --link-underline-offset: 2px;
}

* { box-sizing: border-box; }
html, body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--text-color);
  background: var(--apple-grey-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==== Layout Containers ==== */
.main-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
}

/* Fixed top nav (subtle, Apple-like) */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: saturate(180%) blur(12px);
  background: rgba(250,250,252,0.72);
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.top-nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.brand .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--apple-blue);
  box-shadow: 0 0 0 4px rgba(0,122,255,0.15);
}
.nav-actions .burger {
  width: 36px; height: 36px;
  border-radius: 9px;
  border: 1px solid rgba(0,0,0,0.08);
  display: grid; place-items: center;
  background: var(--apple-white);
  box-shadow: var(--shadow-soft);
  cursor: pointer;
  transition: var(--transition);
}
.nav-actions .burger:hover { transform: translateY(-1px); }

/* Inline burger menu panel (local help/actions) */
.inline-menu {
  position: fixed;
  top: 64px;
  right: 16px;
  width: 260px;
  background: var(--apple-white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: 12px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: var(--transition);
}
.inline-menu.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.inline-menu h4 {
  margin: 6px 0 10px 0;
  font-size: 14px;
  font-weight: 700;
}
.inline-menu a {
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  text-decoration: underline;
  text-underline-offset: var(--link-underline-offset);
  color: var(--text-color);
}
.inline-menu a:hover { background: var(--apple-grey-100); }

/* ==== Header (full-width black) ==== */
.header {
  margin: 18px 0 28px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--apple-black);
  color: #ffff !important;    /* Force white text */
  box-shadow: var(--shadow-soft);
}
.header, .header * {
  color: #ffff !important;    /* All content in white */
}
.header a, .header a:visited, .header a:active {
  color: #ffff !important;    /* White links */
  text-decoration: underline;
  text-underline-offset: var(--link-underline-offset);
}
.header-inner {
  padding: 48px 32px;
  text-align: center;
}
.header h1 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: clamp(28px, 3.5vw, 40px);
}
.header p {
  opacity: 0.92;
  font-size: 17px;
  line-height: 1.5;
  margin: 12px auto 0;
  max-width: 760px;
}

/* ==== Section Cards (alternating backgrounds) ==== */
.section {
  background: var(--apple-white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-soft);
}
.section + .section { margin-top: 16px; }

/* Alternate section – subtle grey Apple background */
.section.alt {
  background: var(--apple-grey-100);
}

/* Labels/titles inside sections */
.section h3, .section h2, .section h4 {
  margin-top: 0;
  letter-spacing: -0.01em;
}
.section h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

/* ==== Inputs & Controls ==== */
input[type="text"], input[type="password"], textarea {
  border-radius: var(--radius-md) !important;
  border: 1px solid rgba(0,0,0,0.08) !important;
  background: var(--apple-white) !important;
  transition: var(--transition) !important;
  box-shadow: 0 1px 0 rgba(0,0,0,0.02) inset;
}
input:focus, textarea:focus {
  outline: none !important;
  border-color: var(--apple-blue) !important;
  box-shadow: 0 0 0 3px rgba(0,122,255,0.15) !important;
}

/* Buttons */
.apple-button, .reset-button, .ghost-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 44px;
  padding: 0 18px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: var(--transition);
  user-select: none;
}
.apple-button {
  background: var(--apple-blue);
  color: #fff;
  box-shadow: 0 6px 18px rgba(0,122,255,0.25);
}
.apple-button:hover { background: var(--apple-blue-hover); transform: translateY(-1px); }
.apple-button:active { transform: translateY(0); }

.reset-button {
  background: var(--apple-red);
  color: #fff;
  box-shadow: 0 6px 18px rgba(255,59,48,0.22);
}
.reset-button:hover { filter: brightness(0.96); transform: translateY(-1px); }
.reset-button:active { transform: translateY(0); }

/* Secondary ghost button style if needed */
.ghost-button {
  background: var(--apple-white);
  color: var(--text-color);
  border: 1px solid rgba(0,0,0,0.08);
}
.ghost-button:hover { background: #fafafa; }

/* Status messages */
.status-success { color: var(--apple-green); font-weight: 600; }
.status-error   { color: var(--apple-red);   font-weight: 600; }

/* ==== Tabs Styling (Apple-like) ==== */
.tab-nav {
  background: var(--apple-grey-100);
  border-radius: var(--radius-md);
  padding: 4px;
  display: flex;
  gap: 2px;
  margin-bottom: 16px;
}

.tab-nav button {
  flex: 1;
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--apple-grey-600);
  font-weight: 500;
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.tab-nav button.selected {
  background: var(--apple-white);
  color: var(--text-color);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  font-weight: 600;
}

.tab-nav button:hover:not(.selected) {
  color: var(--text-color);
  background: rgba(255,255,255,0.5);
}

/* Tab content */
.tab-content {
  min-height: 120px;
}

/* ==== Download & Preview ==== */
.preview-card {
  background: var(--apple-white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.preview-header {
  background: linear-gradient(180deg, #fafafa, #f2f2f7);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  padding: 12px 16px;
  display: flex; align-items: center; gap: 8px;
}
.preview-dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: #ff5f57; box-shadow: 16px 0 0 #ffbd2e, 32px 0 0 #28c840;
}
.preview-body {
  padding: 16px;
  max-height: 520px;
  overflow: auto;
  background: var(--apple-grey-50);
}
.preview-body pre, .preview-body code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 12px;
}

/* ==== Footer (full-width black) ==== */
.footer {
  margin-top: 22px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--apple-black);
  color: #ffff !important;    /* Force white text */
  box-shadow: var(--shadow-soft);
}
.footer, .footer * {
  color: #ffff !important;    /* All content in white */
}
.footer a, .footer a:visited, .footer a:active {
  color: #ffff !important;    /* White links */
  text-decoration: underline;
  text-underline-offset: var(--link-underline-offset);
}
.footer-inner {
  padding: 18px 20px;
  font-size: 14px;
  line-height: 1.5;
}

/* Links globally */
a { text-decoration: underline; text-underline-offset: var(--link-underline-offset); }

/* Hover animations */
.section, .preview-card, .header, .footer {
  transition: var(--transition);
}
.section:hover, .preview-card:hover {
  transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 768px) {
  .top-nav-inner { padding: 0 12px; }
  .header-inner { padding: 36px 20px; }
  .preview-body { max-height: 420px; }
}