/* ══════════════════════════════════════════════════════════════
   NASA APOD — Space-Mission Console Redesign
   ══════════════════════════════════════════════════════════════ */

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

/* ── Design Tokens ── */
:root {
  --bg:           #0B0E1A;
  --surface:      #131829;
  --surface-2:    #1A1F35;
  --border:       rgba(94, 234, 212, 0.08);
  --border-dim:   rgba(255, 255, 255, 0.05);
  --accent:       #5EEAD4;
  --accent-warm:  #F5B971;
  --accent-glow:  rgba(94, 234, 212, 0.18);
  --text:         #E8ECF4;
  --text-muted:   #8891A8;
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Source Serif 4', Georgia, serif;
  --font-mono:    'JetBrains Mono', 'Fira Code', monospace;
  --radius:       14px;
  --t-fast:       0.18s;
  --t-mid:        0.32s;
  --t-slow:       0.55s;
  --ease-out:     cubic-bezier(0.22, 1, 0.36, 1);
}

/* ── Light Theme Variable Overrides ── */
.light-theme {
  --bg:           #FAF8F3;
  --surface:      #FFFFFF;
  --surface-2:    #F0EDE6;
  --border:       rgba(35, 38, 47, 0.1);
  --border-dim:   rgba(35, 38, 47, 0.08);
  --accent:       #0EA58A;  /* deepened cyan for contrast on light bg */
  --accent-warm:  #D4840A;  /* deepened amber for contrast on light bg */
  --accent-glow:  rgba(14, 165, 138, 0.12);
  --text:         #23262F;
  --text-muted:   #5C6375;
  /* header bg used in .site-header — override here */
  --header-bg:    rgba(250, 248, 243, 0.88);
}

/* ── Base ── */
body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
  /* Smooth theme transition on color-bearing properties */
  transition:
    background-color 0.25s ease,
    color 0.25s ease;
}

/* ── Atmospheric starfield (pure CSS, no images) ── */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(94,234,212,0.045) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 15% 80%, rgba(94,100,212,0.04) 0%, transparent 60%),
    radial-gradient(ellipse 35% 25% at 85% 60%, rgba(245,185,113,0.025) 0%, transparent 60%),
    radial-gradient(1px 1px at  7%  12%, rgba(255,255,255,0.55) 0%, transparent 100%),
    radial-gradient(1px 1px at 18%  38%, rgba(255,255,255,0.40) 0%, transparent 100%),
    radial-gradient(1px 1px at 27%   5%, rgba(255,255,255,0.60) 0%, transparent 100%),
    radial-gradient(1px 1px at 34%  72%, rgba(255,255,255,0.35) 0%, transparent 100%),
    radial-gradient(1px 1px at 41%  21%, rgba(255,255,255,0.50) 0%, transparent 100%),
    radial-gradient(1px 1px at 52%  88%, rgba(255,255,255,0.30) 0%, transparent 100%),
    radial-gradient(1px 1px at 59%  14%, rgba(255,255,255,0.55) 0%, transparent 100%),
    radial-gradient(1px 1px at 66%  50%, rgba(255,255,255,0.40) 0%, transparent 100%),
    radial-gradient(1px 1px at 73%  78%, rgba(255,255,255,0.45) 0%, transparent 100%),
    radial-gradient(1px 1px at 80%  30%, rgba(255,255,255,0.35) 0%, transparent 100%),
    radial-gradient(1px 1px at 88%  60%, rgba(255,255,255,0.50) 0%, transparent 100%),
    radial-gradient(1px 1px at 94%   8%, rgba(255,255,255,0.60) 0%, transparent 100%),
    radial-gradient(1px 1px at  3%  55%, rgba(255,255,255,0.30) 0%, transparent 100%),
    radial-gradient(1px 1px at 11%  90%, rgba(255,255,255,0.35) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 44%  44%, rgba(255,255,255,0.25) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 63%  95%, rgba(255,255,255,0.20) 0%, transparent 100%),
    radial-gradient(1.5px 1.5px at 77%  17%, rgba(255,255,255,0.28) 0%, transparent 100%),
    radial-gradient(2px 2px at 22%  65%, rgba(94,234,212,0.22) 0%, transparent 100%),
    radial-gradient(2px 2px at 56%  33%, rgba(245,185,113,0.15) 0%, transparent 100%),
    radial-gradient(2px 2px at 90%  82%, rgba(94,234,212,0.18) 0%, transparent 100%);
}

/* All page content sits above the starfield */
.site-header,
.main {
  position: relative;
  z-index: 1;
}

/* ── Header ── */
:root {
  --header-bg: rgba(11, 14, 26, 0.82);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.25s ease, border-color 0.25s ease;
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--accent) 40%,
    var(--accent) 60%,
    transparent 100%
  );
  opacity: 0.25;
}

.header-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 13px 24px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.nasa-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--bg);
  background: var(--accent);
  padding: 4px 10px;
  border-radius: 4px;
  text-transform: uppercase;
  box-shadow: 0 0 12px rgba(94,234,212,0.35);
}

.header-label {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.github-link {
  display: flex;
  align-items: center;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--t-mid) var(--ease-out),
              transform var(--t-mid) var(--ease-out);
}

.github-link:hover {
  color: var(--accent);
  transform: scale(1.15);
}

/* ── Theme Toggle ── */
.theme-toggle {
  margin-left: auto; /* pushes toggle + github to the right */
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  border: 1px solid var(--border-dim);
  border-radius: 8px;
  color: var(--text-muted);
  cursor: pointer;
  transition:
    background var(--t-fast) var(--ease-out),
    border-color var(--t-fast) var(--ease-out),
    color var(--t-fast) var(--ease-out),
    transform var(--t-fast) var(--ease-out);
}

.theme-toggle:hover {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(12deg) scale(1.08);
}

/* Show moon in dark mode, sun in light mode */
.icon-sun  { display: none; }
.icon-moon { display: block; }

.light-theme .icon-sun  { display: block; }
.light-theme .icon-moon { display: none; }

/* ── Main layout ── */
.main {
  padding: 48px 24px 96px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* ── Date navigation bar ── */
.date-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 820px;
  width: 100%;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.date-nav::before {
  content: 'MISSION · DATE NAVIGATION';
  display: block;
  width: 100%;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  opacity: 0.6;
  margin-bottom: 6px;
}

.nav-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border-dim);
  border-radius: 8px;
  padding: 9px 16px;
  cursor: pointer;
  white-space: nowrap;
  transition:
    background var(--t-fast) var(--ease-out),
    border-color var(--t-fast) var(--ease-out),
    box-shadow var(--t-mid) var(--ease-out),
    transform var(--t-fast) var(--ease-out),
    opacity var(--t-fast);
}

.nav-btn:hover:not(:disabled) {
  border-color: var(--accent);
  box-shadow:
    0 0 0 1px var(--accent),
    0 0 14px rgba(94,234,212,0.25),
    0 4px 12px rgba(0,0,0,0.4);
  transform: translateY(-1px);
}

.nav-btn:active:not(:disabled) {
  transform: scale(0.97) translateY(0);
  box-shadow: none;
}

.nav-btn--accent {
  border-color: rgba(245,185,113,0.3);
  color: var(--accent-warm);
}

.nav-btn--accent:hover:not(:disabled) {
  border-color: var(--accent-warm);
  box-shadow:
    0 0 0 1px var(--accent-warm),
    0 0 14px rgba(245,185,113,0.22),
    0 4px 12px rgba(0,0,0,0.4);
}

.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ── Custom Datepicker ── */
.custom-datepicker {
  position: relative;
}

.date-picker-btn {
  display: flex;
  align-items: center;
  gap: 8px;
}

.date-picker-btn[aria-expanded="true"] {
  border-color: var(--accent);
  box-shadow:
    0 0 0 1px var(--accent),
    0 0 14px rgba(94,234,212,0.25),
    0 4px 12px rgba(0,0,0,0.4);
}

.calendar-icon {
  font-size: 13px;
}

.calendar-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  width: 280px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.6);
  z-index: 100;
  transform-origin: top left;
  transition: opacity var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out);
}

.calendar-dropdown.hidden {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
  display: block !important; /* Override standard .hidden so transition works */
  visibility: hidden;
}

.calendar-dropdown:not(.hidden) {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
  visibility: visible;
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  min-height: 28px;
}

.cal-month-year-btn {
  background: transparent;
  border: 1px solid transparent;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 13px;
  color: var(--text);
  letter-spacing: 0.02em;
  padding: 4px 8px;
  border-radius: 6px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background var(--t-fast) var(--ease-out),
              border-color var(--t-fast) var(--ease-out),
              color var(--t-fast) var(--ease-out);
}

.cal-month-year-btn::after {
  content: '▾';
  font-size: 10px;
  color: var(--text-muted);
  transition: transform var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}

.cal-month-year-btn:hover {
  background: var(--surface-2);
  border-color: var(--border-dim);
  color: var(--accent);
}

.cal-month-year-btn:hover::after {
  color: var(--accent);
}

.cal-month-year-btn.active::after {
  transform: rotate(180deg);
  color: var(--accent);
}

.cal-nav-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  font-size: 18px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast), opacity var(--t-fast);
}

.cal-nav-btn:hover:not(:disabled) {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border-dim);
}

.cal-nav-btn:disabled {
  opacity: 0.2;
  cursor: not-allowed;
}

.cal-nav-btn.hidden {
  visibility: hidden;
  pointer-events: none;
}

.cal-view {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.cal-view.hidden {
  display: none !important;
}

.cal-weekdays,
.cal-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  text-align: center;
}

.cal-weekdays span {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
}

.cal-day {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 0;
  border-radius: 6px;
  cursor: pointer;
  transition: background var(--t-fast), color var(--t-fast);
}

.cal-day:hover:not(.disabled):not(.selected) {
  background: var(--surface-2);
  border-color: var(--border-dim);
}

.cal-day.today:not(.selected) {
  color: var(--accent-warm);
  font-weight: 700;
}

.cal-day.selected {
  background: var(--accent);
  color: var(--bg);
  font-weight: 700;
}

.cal-day.disabled {
  opacity: 0.2;
  cursor: not-allowed;
}

/* ── Year and Month Picker Views ── */
.cal-years-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  max-height: 196px;
  overflow-y: auto;
  padding: 2px 4px 2px 2px;
}

.cal-years-list::-webkit-scrollbar {
  width: 4px;
}

.cal-years-list::-webkit-scrollbar-track {
  background: var(--surface-2);
  border-radius: 4px;
}

.cal-years-list::-webkit-scrollbar-thumb {
  background: rgba(94, 234, 212, 0.25);
  border-radius: 4px;
}

.cal-years-list::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

.cal-year-btn,
.cal-month-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 8px 4px;
  border-radius: 6px;
  cursor: pointer;
  text-align: center;
  transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast);
}

.cal-year-btn:hover:not(.disabled):not(.selected),
.cal-month-btn:hover:not(.disabled):not(.selected) {
  background: var(--surface-2);
  border-color: var(--border-dim);
  color: var(--accent);
}

.cal-year-btn.today:not(.selected),
.cal-month-btn.today:not(.selected) {
  color: var(--accent-warm);
  font-weight: 700;
}

.cal-year-btn.selected,
.cal-month-btn.selected {
  background: var(--accent);
  color: var(--bg);
  font-weight: 700;
}

.cal-year-btn.disabled,
.cal-month-btn.disabled {
  opacity: 0.2;
  cursor: not-allowed;
}

.cal-months-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 8px 0;
}

/* ── Card ── */
.card {
  width: 100%;
  max-width: 820px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  box-shadow:
    0 0 0 1px var(--border-dim),
    0 0 40px var(--accent-glow),
    0 12px 60px rgba(0,0,0,0.25);
}

/* Hairline accent top edge */
.card::before {
  content: '';
  display: block;
  height: 2px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(94,234,212,0.6) 30%,
    var(--accent) 50%,
    rgba(94,234,212,0.6) 70%,
    transparent 100%
  );
}

/* ── Skeleton loader ── */
.skeleton-group {
  padding: 0 0 36px;
}

@keyframes shimmer {
  0%   { background-position: -700px 0; }
  100% { background-position:  700px 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--surface-2) 25%,
    rgba(94,234,212,0.06) 50%,
    var(--surface-2) 75%
  );
  background-size: 700px 100%;
  animation: shimmer 1.6s infinite linear;
  border-radius: 6px;
}

.skeleton-media {
  width: 100%;
  height: 420px;
  border-radius: 0;
  margin-bottom: 2px;
}

.skeleton-title {
  height: 24px;
  width: 55%;
  margin: 28px 28px 10px;
}

.skeleton-date {
  height: 13px;
  width: 22%;
  margin: 0 28px 20px;
}

.skeleton-text {
  height: 12px;
  margin: 0 28px 10px;
}

.skeleton-text.short {
  width: 68%;
}

/* ── Media ── */
.media-wrapper {
  width: 100%;
  background: #000;
  line-height: 0;
  position: relative;
}

/* Bottom vignette — uses surface color so it matches whichever theme is active */
.media-wrapper::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 80px;
  background: linear-gradient(to top, var(--surface), transparent);
  pointer-events: none;
  opacity: 0.7;
}

.apod-image {
  width: 100%;
  max-height: 560px;
  object-fit: cover;
  display: block;
  cursor: zoom-in;
  transition: opacity var(--t-slow) var(--ease-out),
              transform 0.4s var(--ease-out);
}

.apod-image:hover {
  transform: scale(1.01);
}

.apod-iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  display: block;
}

/* ── Content crossfade on reveal ── */
@keyframes content-fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.apod-content:not(.hidden) {
  animation: content-fade-in var(--t-slow) var(--ease-out) both;
}

/* ── Card body ── */
.card-body {
  padding: 32px 36px 44px;
}

.card-body::before {
  content: '── MISSION REPORT ──────────────────';
  display: block;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--text-muted);
  opacity: 0.35;
  margin-bottom: 22px;
  white-space: nowrap;
  overflow: hidden;
}

.meta-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

/* ── Title ── */
.apod-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

/* ── Date — telemetry readout [ YYYY-MM-DD ] ── */
.apod-date {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  background: rgba(94,234,212,0.08);
  border: 1px solid rgba(94,234,212,0.22);
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 6px;
  letter-spacing: 0.05em;
}

.apod-date::before { content: '[ '; }
.apod-date::after  { content: ' ]'; }

/* ── Explanation ── */
.apod-explanation {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-muted);
}

/* ── Copyright ── */
.apod-copyright {
  margin-top: 28px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  opacity: 0.55;
}

.apod-copyright:not(:empty)::before {
  content: '© IMAGERY · ';
}

/* ── Error state ── */
.error-state {
  padding: 72px 32px;
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.error-icon {
  font-size: 2.5rem;
  display: block;
  margin-bottom: 16px;
}

/* ── Utilities ── */
.hidden {
  display: none !important;
}

/* ── Lightbox ── */
@keyframes lb-in {
  from { opacity: 0; transform: scale(0.93); }
  to   { opacity: 1; transform: scale(1); }
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  /* Theme-aware backdrop: very dark in dark mode, semi-transparent in light */
  background: rgba(0, 0, 0, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  animation: lb-in 0.22s var(--ease-out);
}

.lightbox-img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 10px;
  box-shadow:
    0 0 0 1px var(--accent-glow),
    0 24px 80px rgba(0,0,0,0.7);
  animation: lb-in 0.24s var(--ease-out);
}

.lightbox-close {
  position: fixed;
  top: 20px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border-dim);
  color: var(--text);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  transition:
    background var(--t-fast) var(--ease-out),
    border-color var(--t-fast) var(--ease-out),
    box-shadow var(--t-mid) var(--ease-out),
    transform var(--t-fast) var(--ease-out);
  z-index: 1001;
}

.lightbox-close:hover {
  background: var(--accent-glow);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 0 12px var(--accent-glow);
  transform: scale(1.1);
}

/* ── Reduced motion ── */
@media (prefers-reduced-motion: reduce) {
  .apod-content:not(.hidden),
  .apod-image,
  .apod-image:hover,
  .nav-btn:hover:not(:disabled),
  .nav-btn--accent:hover:not(:disabled),
  .lightbox,
  .lightbox-img,
  .lightbox-close,
  .github-link {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .main {
    padding: 24px 12px 64px;
  }

  .card-body {
    padding: 24px 20px 32px;
  }

  .card-body::before {
    display: none;
  }

  .apod-title {
    font-size: 1.25rem;
  }

  .skeleton-media {
    height: 240px;
  }

  .meta-row {
    flex-direction: column;
    gap: 8px;
  }

  .date-nav {
    gap: 6px;
  }

  .nav-btn {
    font-size: 11px;
    padding: 8px 12px;
  }
}