@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* --- Reset & Global Variables --- */
:root {
  --color-primary: #1e6ffd;
  --color-primary-hover: #0c56d0;
  --color-secondary: #0f172a;
  --color-secondary-hover: #000000;
  --color-bg: #f8fafc;
  --color-card-bg: #ffffff;
  --color-text-main: #1e293b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --font-sans: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* --- Container Utility --- */
.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header Styling --- */
header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-svg {
  width: 38px;
  height: 38px;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 18px;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.5px;
  line-height: 1.1;
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-primary);
  letter-spacing: 1px;
  font-weight: 700;
  text-transform: uppercase;
  margin-top: 3px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: #f0fdf4;
  color: #16a34a;
  border: 1px solid #dcfce7;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

/* --- Main Layout --- */
main {
  flex: 1;
  padding: 48px 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* --- Masthead Titles --- */
.masthead {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 48px auto;
}

.os-detector-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: #eff6ff;
  border: 1px solid #dbeafe;
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 9999px;
  margin-bottom: 16px;
}

.page-title {
  font-size: 32px;
  font-weight: 800;
  color: #0f172a;
  letter-spacing: -0.75px;
  line-height: 1.25;
}

.page-desc {
  font-size: 15px;
  color: var(--color-text-muted);
  margin-top: 10px;
  line-height: 1.6;
}

/* --- Twin Cards Grid --- */
.download-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-bottom: 48px;
}

@media (min-width: 768px) {
  .download-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.download-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.02);
}

.download-card:hover {
  border-color: #cbd5e1;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.04);
}

/* Recommended highlight styling */
.download-card.highlighted {
  border-color: var(--color-primary);
  box-shadow: 0 10px 25px -5px rgba(30, 111, 253, 0.08);
}

.recommend-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary);
  color: #ffffff;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 9999px;
  text-transform: uppercase;
}

.card-top {
  margin-bottom: 24px;
}

.card-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
}

.icon-wrapper {
  padding: 12px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.icon-wrapper.blue {
  background-color: #eff6ff;
  color: var(--color-primary);
}

.icon-wrapper.indigo {
  background-color: #f5f3ff;
  color: #6366f1;
}

.platform-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  text-transform: uppercase;
}

.platform-tag.blue {
  color: var(--color-primary);
  background-color: #eff6ff;
}

.platform-tag.indigo {
  color: #6366f1;
  background-color: #f5f3ff;
}

.target-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 6px;
}

.card-title {
  font-size: 20px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 10px;
}

.card-body-text {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

/* Table specs styling inside cards */
.specs-table {
  background-color: #f8fafc;
  border-radius: 16px;
  padding: 16px;
  border: 1px solid #f1f5f9;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #475569;
}

.specs-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
}

.specs-row:not(:last-child) {
  border-bottom: 1px dashed #e2e8f0;
}

.specs-val {
  font-weight: 600;
  color: #0f172a;
}

/* Button variants */
.btn {
  width: 100%;
  border: none;
  border-radius: 16px;
  padding: 16px;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
}

.btn-dark {
  background-color: var(--color-secondary);
  color: #ffffff;
}

.btn-dark:hover {
  background-color: var(--color-secondary-hover);
}

.certification {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 11px;
  color: var(--color-text-muted);
}

.certification-icon {
  color: #10b981;
}

/* --- Guides Panel --- */
.guide-panel {
  background-color: #ffffff;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 32px;
  text-align: left;
  margin-bottom: 48px;
}

.guide-title {
  font-size: 15px;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.guide-icon {
  color: var(--color-primary);
}

.guide-steps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .guide-steps-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.step-col {
  border-left: 2px solid var(--color-primary);
  padding-left: 12px;
}

.step-col.indigo {
  border-left-color: #6366f1;
}

.step-col.cyan {
  border-left-color: #06b6d4;
}

.step-headline {
  font-weight: 700;
  color: #0f172a;
  font-size: 13px;
  margin-bottom: 6px;
}

.step-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- Technical Parameters Grid --- */
.tech-specs-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
  font-size: 12px;
  color: var(--color-text-muted);
  text-align: left;
}

@media (min-width: 768px) {
  .tech-specs-row {
    grid-template-columns: 1fr 1fr 1fr 1fr;
  }
}

.tech-spec-title {
  display: block;
  font-weight: 600;
  color: #475569;
  margin-bottom: 4px;
}

/* --- Footer --- */
footer {
  background-color: #ffffff;
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
  font-size: 12px;
  color: var(--color-text-muted);
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

@media (min-width: 640px) {
  .footer-container {
    flex-direction: row;
  }
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-links span:hover {
  color: var(--color-text-main);
  cursor: pointer;
}

/* --- Keyframe Animations --- */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: .5;
    transform: scale(1.1);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease-out forwards;
}