/* ============================================================
   RUBIN-OS — Page Stylesheet
   Aesthetic: Ruby · Polished · Deep Red · Gemstone
   Dark red base · Crimson/ruby accent · Sharp geometry
   ============================================================ */

:root {
  /* --- Base palette (deep dark red, not cold blue) --- */
  --color-bg: #0f0a0b;
  --color-bg-elevated: #160d0f;
  --color-bg-terminal: #0a0708;
  --color-grid-line: rgba(255, 160, 160, 0.04);
  --color-grid-line-strong: rgba(255, 160, 160, 0.07);

  --color-border: rgba(220, 100, 110, 0.1);
  --color-border-strong: rgba(220, 100, 110, 0.22);

  --color-text: #f5eaeb;
  --color-text-muted: #8a6e72;
  --color-text-faint: #4e3035;

  /* --- Rubin accents --- */
  --color-ruby: #c9445f;
  --color-ruby-bright: #e05070;
  --color-ruby-ink: #150005;
  --color-ruby-dim: rgba(201, 68, 95, 0.12);

  --color-nvidia: #76b900;
  --color-nvidia-ink: #050d00;
  --color-nvidia-dim: rgba(118, 185, 0, 0.15);

  /* --- Terminal colours --- */
  --color-term-prompt: #c9445f;
  --color-term-path: #8a4050;
  --color-term-sep: #4e3035;
  --color-term-cmd: #f5eaeb;
  --color-term-out: #6e4850;
  --color-term-cursor: #c9445f;

  /* --- Typography --- */
  --font-display: "Space Grotesk", "Arial Black", sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* --- Spacing --- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  --radius: 2px;
  --header-height: 64px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-mono);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  background-image:
    linear-gradient(var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-line) 1px, transparent 1px),
    linear-gradient(var(--color-grid-line-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-line-strong) 1px, transparent 1px);
  background-size: 20px 20px, 20px 20px, 100px 100px, 100px 100px;
  background-position: -1px -1px, -1px -1px, -1px -1px, -1px -1px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* ============================================================
   NAVBAR
   ============================================================ */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  display: flex;
  align-items: center;
  background: rgba(15, 10, 11, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.navbar__inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.navbar__logo {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.navbar__wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.navbar__wordmark span {
  color: var(--color-ruby);
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.navbar__link {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-text-muted);
  transition: color 0.15s ease;
}

.navbar__link:hover {
  color: var(--color-ruby);
}

.navbar__tag {
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius);
}

.navbar__tag span {
  color: var(--color-ruby);
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-ruby);
  color: var(--color-ruby-ink);
  border-color: var(--color-ruby);
}

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

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border-strong);
}

.btn--outline:hover {
  border-color: var(--color-text);
  background: rgba(255, 255, 255, 0.04);
}

.btn--nvidia {
  background: var(--color-nvidia);
  color: var(--color-nvidia-ink);
  border-color: var(--color-nvidia);
}

.btn--nvidia:hover {
  filter: brightness(1.12);
}

.btn--block {
  width: 100%;
  justify-content: center;
  margin-top: var(--space-6);
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  position: relative;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero__inner {
  padding: var(--space-24) 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.hero__label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ruby);
  margin-bottom: var(--space-6);
}

.hero__label::before {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  background: var(--color-ruby);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 700;
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-6);
}

.hero__title-accent {
  color: var(--color-ruby);
}

.hero__subtitle {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  max-width: 44ch;
  margin-bottom: var(--space-8);
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* Coordinate readout */
.coord-readout {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
  text-align: right;
  pointer-events: none;
  z-index: 2;
}

.coord-readout span {
  color: var(--color-ruby);
}

/* ============================================================
   TERMINAL WIDGET
   ============================================================ */

.hero__terminal {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-terminal);
  overflow: hidden;
}

.terminal__bar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

.terminal__bar-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-text-faint);
  opacity: 0.5;
}

.terminal__bar-title {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-left: var(--space-2);
}

.terminal__body {
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  height: 280px;
  overflow: hidden;
}

.terminal__body--flat {
  height: unset;
  padding: var(--space-4) var(--space-6);
  background: var(--color-bg-terminal);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.terminal__line {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  white-space: pre;
}

.terminal__spacer {
  height: var(--space-2);
}

.terminal__prompt {
  color: var(--color-term-prompt);
  font-weight: 600;
}

.terminal__sep {
  color: var(--color-term-sep);
}

.terminal__path {
  color: var(--color-term-path);
}

.terminal__cmd {
  color: var(--color-term-cmd);
}

.terminal__out {
  color: var(--color-term-out);
}

.terminal__out--muted {
  color: var(--color-text-faint);
  font-style: italic;
}

.terminal__cursor {
  color: var(--color-term-cursor);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* ============================================================
   SECTIONS
   ============================================================ */

.section {
  padding: var(--space-24) 0;
  border-bottom: 1px solid var(--color-border);
}

.section__label {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ruby);
  margin-bottom: var(--space-4);
}

.section__label::before {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  background: var(--color-ruby);
}

.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-4);
}

.section__subtitle {
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-12);
}

/* ============================================================
   SPEC TABLE
   ============================================================ */

.spec-table {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.spec-row {
  display: grid;
  grid-template-columns: 200px 1fr auto;
  gap: var(--space-6);
  align-items: center;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  transition: background 0.12s ease;
}

.spec-row:last-child {
  border-bottom: none;
}

.spec-row:hover {
  background: rgba(201, 68, 95, 0.05);
}

.spec-key {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

.spec-val {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.spec-tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius);
  white-space: nowrap;
}

.spec-tag--on {
  background: var(--color-ruby-dim);
  color: var(--color-ruby);
  border: 1px solid rgba(201, 68, 95, 0.25);
}

.spec-tag--off {
  background: rgba(255, 255, 255, 0.04);
  color: var(--color-text-faint);
  border: 1px solid var(--color-border);
}

.spec-tag--nvidia {
  background: var(--color-nvidia-dim);
  color: var(--color-nvidia);
  border: 1px solid rgba(118, 185, 0, 0.3);
}

/* ============================================================
   PREVIEW
   ============================================================ */

.preview-block {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg-elevated);
}

.preview-img {
  width: 100%;
  height: auto;
  display: block;
}

/* ============================================================
   DOWNLOAD
   ============================================================ */

.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-12);
}

.download-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-elevated);
  transition: border-color 0.15s ease;
}

.download-card:hover {
  border-color: var(--color-ruby);
}

.download-card--nvidia:hover {
  border-color: var(--color-nvidia);
}

.download-card__header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.download-card__num {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-text-faint);
  padding-top: 2px;
}

.download-card__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  text-transform: uppercase;
}

.download-card__sub {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.download-card__badge {
  margin-left: auto;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius);
  background: var(--color-ruby-dim);
  color: var(--color-ruby);
  border: 1px solid rgba(201, 68, 95, 0.25);
  white-space: nowrap;
}

.download-card__badge--nvidia {
  background: var(--color-nvidia-dim);
  color: var(--color-nvidia);
  border-color: rgba(118, 185, 0, 0.3);
}

.download-card__meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-terminal);
}

.download-meta-row {
  display: flex;
  gap: var(--space-4);
  font-size: 0.78rem;
}

.download-meta-key {
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  width: 80px;
  flex-shrink: 0;
}

.download-meta-val {
  color: var(--color-text-muted);
}

.download-card__sha {
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-bg-terminal);
}

.sha-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

.sha-value {
  font-size: 0.75rem;
  color: var(--color-ruby);
  word-break: break-all;
  opacity: 0.6;
  font-style: italic;
}

/* Verify block */
.verify-block {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.verify-block__label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  padding: var(--space-3) var(--space-6);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 860px) {
  .hero__inner {
    grid-template-columns: 1fr;
    padding: var(--space-16) 0;
  }

  .download-grid {
    grid-template-columns: 1fr;
  }

  .spec-row {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  .spec-tag {
    width: fit-content;
  }

  .navbar__nav {
    display: none;
  }

  .navbar__tag {
    display: none;
  }
}