/* ==========================================================================
   NotesByME — Global layout, typography & shell
   Premium wallpaper + frosted-glass home edition.
   ========================================================================== */

/* ---------------------------------------------------------------- a11y -- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: var(--sp-2);
  left: var(--sp-2);
  z-index: 200;
  transform: translateY(-150%);
  padding: var(--sp-3) var(--sp-5);
  border-radius: var(--r-sm);
  background: var(--primary);
  color: var(--primary-contrast);
  font-weight: var(--fw-semibold);
  box-shadow: var(--shadow-md);
  transition: transform var(--t-base) var(--ease);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--r-xs);
}

/* ------------------------------------------------------------ typography -- */
h1,
h2,
h3,
h4 {
  line-height: var(--lh-tight);
  font-weight: var(--fw-bold);
  letter-spacing: -0.011em;
  color: var(--text);
}

h1 {
  font-size: var(--fs-2xl);
}

h2 {
  font-size: var(--fs-xl);
}

h3 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
}

p {
  line-height: var(--lh-relaxed);
  color: var(--text-muted);
}

strong {
  font-weight: var(--fw-semibold);
  color: var(--text);
}

/* ------------------------------------------------------------ wallpaper --- */
/* Replaceable wallpaper architecture:
   --wallpaper-image  -> swap this one variable to change the wallpaper
   --wallpaper-overlay -> readability tint, independent of the image */
.wallpaper {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-color: var(--wallpaper-fallback, #0b1030);
  background-image: var(--wallpaper-image);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}

.wallpaper::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--wallpaper-overlay);
  pointer-events: none;
}

/* Premium night-aurora readability overlay (light + dark share wallpaper). */
:root {
  --wallpaper-overlay: linear-gradient(
    180deg,
    rgba(5, 8, 22, 0.52) 0%,
    rgba(5, 8, 22, 0.44) 38%,
    rgba(5, 8, 22, 0.58) 100%
  );
}

[data-theme="dark"] {
  --wallpaper-overlay: linear-gradient(
    180deg,
    rgba(3, 5, 16, 0.62) 0%,
    rgba(3, 5, 16, 0.55) 38%,
    rgba(3, 5, 16, 0.7) 100%
  );
}

/* Wallpaper-frosted text: white/light over wallpaper in both themes. */
:root,
[data-theme="dark"] {
  --text: #f2f5ff;
  --text-muted: rgba(235, 240, 255, 0.78);
  --text-subtle: rgba(235, 240, 255, 0.6);
  --border: rgba(255, 255, 255, 0.22);
}

/* Generic .card base becomes frosted glass (wallpaper shows through). */
.card {
  background: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

/* ------------------------------------------------------------- shell ------- */
.app-shell {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
}

/* Transparent glass-friendly header: no solid box over the wallpaper. */
.app-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(5, 8, 22, 0.42), rgba(5, 8, 22, 0));
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

.app-header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 var(--sp-4);
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-1) 0;
  border-radius: var(--r-sm);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: linear-gradient(140deg, #38bdf8, #818cf8 55%, #e879f9);
  color: #fff;
  font-size: 15px;
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
  box-shadow: 0 6px 18px rgba(56, 189, 248, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.45);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-size: 15px;
  font-weight: var(--fw-bold);
  letter-spacing: -0.01em;
}

.brand__tag {
  font-size: var(--fs-xs);
  color: var(--text-subtle);
  font-weight: var(--fw-medium);
}

.app-header__spacer {
  flex: 1 1 auto;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

/* ------------------------------------------------------------- main area -- */
.app-main {
  flex: 1 1 auto;
  flex: 1 1 auto;
  display: block;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--sp-5) var(--sp-4) var(--sp-8);
}

.app-footer {
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 var(--sp-4) calc(var(--sp-8) + 4px);
  color: var(--text-subtle);
  font-size: var(--fs-xs);
  line-height: var(--lh-relaxed);
}

.app-footer__note {
  border-top: 1px solid var(--border);
  padding-top: var(--sp-4);
}

/* -------------------------------------------------------- page sections -- */
.page {
  display: flex;
  flex-direction: column;
  gap: var(--sp-6);
  animation: page-in var(--t-slow) var(--ease) both;
}

@keyframes page-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-head {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.page-head__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
}

.page-head__title {
  font-size: clamp(1.45rem, 1.1rem + 1.6vw, 1.95rem);
}

.page-head__sub {
  max-width: 62ch;
  font-size: var(--fs-sm);
  color: var(--text-muted);
}

.section {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
}

.section-title {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
}

.section-title svg {
  color: var(--primary);
}

.section-sub {
  font-size: var(--fs-sm);
  color: var(--text-subtle);
}

/* ------------------------------------------------------------- utilities -- */
.stack {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.row-flex {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
}

.text-sm {
  font-size: var(--fs-sm);
}

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

.text-subtle {
  color: var(--text-subtle);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.mt-auto {
  margin-top: auto;
}

/* -------------------------------------------------------------- shapes --- */
.spinner {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: var(--primary-contrast);
  animation: spin 700ms linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Focus behaviour: only show rings for keyboard users on supporting browsers */
@supports selector(:focus-visible) {
  :focus:not(:focus-visible) {
    outline: none;
  }
}

/* =========================================================== home premium */
.home-stack {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  max-width: 520px;
  margin-inline: auto;
  width: 100%;
}

/* Invisible flow divider: premium air, not a line. */
.card-stack-divider {
  height: var(--sp-1);
  opacity: 0;
}

/* Transparent hero header (no solid container). */
.home-hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-2) var(--sp-1) 0;
}

.home-hero__title {
  font-size: clamp(1.9rem, 1.5rem + 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #fff;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.45);
  line-height: 1.05;
}

.home-hero__sub {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.72);
  font-weight: var(--fw-medium);
  margin-top: 4px;
}

.home-hero__search {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: #fff;
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  transition: transform var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}

.home-hero__search:hover { background: rgba(255, 255, 255, 0.28); transform: translateY(-1px); }
.home-hero__search:active { transform: scale(0.96); }

/* -------------------------------------------------- today card styles --- */
.home-today-card {
  padding: var(--sp-6);
  position: relative;
  overflow: hidden;
}

.home-today-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  opacity: 0.9;
}

.home-today-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-4);
}

.home-today-card__label {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--sp-1) var(--sp-3);
  background: var(--primary-soft);
  border-radius: var(--r-full);
}

.home-today-card__day {
  font-size: var(--fs-sm);
  color: var(--text-subtle);
  font-weight: var(--fw-medium);
}

.home-today-card__date-time {
  margin-bottom: var(--sp-4);
}

.home-today-card__date {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--text);
  margin-bottom: var(--sp-1);
  letter-spacing: -0.01em;
}

.home-today-card__time {
  font-family: var(--font-mono);
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--primary);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.home-today-card__motivation {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: var(--sp-5);
  padding: var(--sp-3) var(--sp-4);
  background: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--r-md);
  border: 1px solid var(--glass-border);
}

.home-today-card__quick-stats {
  display: flex;
  gap: var(--sp-4);
}

.home-today-card__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  padding: var(--sp-3);
  background: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  text-align: center;
}

.home-today-card__stat-value {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

.home-today-card__stat-label {
  font-size: var(--fs-xs);
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* -------------------------------------------- action card styles ------- */
.home-action-card {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-5);
  text-align: left;
  width: 100%;
  cursor: pointer;
}

.home-action-card__icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: var(--r-md);
  background: var(--primary-soft);
  color: var(--primary);
  flex-shrink: 0;
}

.home-action-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
  flex: 1;
  min-width: 0;
}

.home-action-card__title {
  display: block;
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--text);
  margin-bottom: var(--sp-1);
}

.home-action-card__text {
  display: block;
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: var(--lh-relaxed);
  margin-bottom: 0;
}

.home-action-card__arrow {
  color: var(--text-subtle);
  transition: transform var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.home-action-card:hover .home-action-card__arrow {
  transform: translateX(4px);
  color: var(--primary);
}

/* ------------------------------------------- continue studying card --- */
.home-continue-card {
  padding: var(--sp-5);
}

.home-continue-card__header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.home-continue-card__icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--accent-soft);
  color: var(--accent);
}

.home-continue-card__title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--text);
}

.home-continue-card__content {
  margin-bottom: var(--sp-4);
}

.home-continue-card__text {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--sp-3);
}

.home-continue-card__progress {
  display: flex;
  gap: var(--sp-4);
}

.home-continue-card__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.home-continue-card__stat-value {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

.home-continue-card__stat-label {
  font-size: var(--fs-xs);
  color: var(--text-subtle);
}

.home-continue-card__actions {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

/* --------------------------------------------- quick actions section -- */
.home-quick-actions {
  padding: 0;
}

.home-section-title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--text);
  margin-bottom: var(--sp-3);
  padding-bottom: var(--sp-2);
  border-bottom: 1px solid var(--glass-border);
}

.home-quick-actions__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--sp-3);
}

.home-quick-action {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-4);
  background: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  box-shadow: var(--glass-shadow);
  cursor: pointer;
  transition: all var(--t-base) var(--ease);
  text-align: left;
  width: 100%;
}

.home-quick-action:hover {
  background: var(--glass-surface-strong);
  box-shadow: var(--glass-shadow-hover);
  transform: translateY(-2px);
}

.home-quick-action__icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-md);
  background: var(--primary-soft);
  color: var(--primary);
}

.home-quick-action__content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.home-quick-action__title {
  display: block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--text);
  margin-bottom: 2px;
}

.home-quick-action__desc {
  display: block;
  font-size: var(--fs-xs);
  color: var(--text-subtle);
  line-height: var(--lh-normal);
}

.home-quick-action__arrow {
  color: var(--text-subtle);
  transition: transform var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.home-quick-action:hover .home-quick-action__arrow {
  transform: translateX(3px);
  color: var(--primary);
}

/* ---------------------------------------------- motivational recap card - */
.home-recap-card {
  padding: var(--sp-5);
}

.home-recap-card__header {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin-bottom: var(--sp-4);
}

.home-recap-card__icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--r-md);
  background: var(--primary-soft);
  color: var(--primary);
}

.home-recap-card__title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--text);
}

.home-recap-card__content {
  margin-bottom: var(--sp-4);
}

.home-recap-card__stats {
  display: flex;
  gap: var(--sp-4);
  margin-bottom: var(--sp-3);
}

.home-recap-card__stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
  padding: var(--sp-3);
  background: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  text-align: center;
}

.home-recap-card__stat-value {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  color: var(--primary);
  font-variant-numeric: tabular-nums;
}

.home-recap-card__stat-label {
  font-size: var(--fs-xs);
  color: var(--text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.home-recap-card__message {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  font-style: italic;
  text-align: center;
  padding: var(--sp-3);
  background: var(--glass-surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--r-md);
  border: 1px solid var(--glass-border);
}