/* ═══════════════════════════════════════════════════════════════════════════
   Weather Dashboard — Stylesheet
   Design: clean white cards on light grey canvas, Inter font, blue accent.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Custom properties ───────────────────────────────────────────────────── */
:root {
  --color-bg:          #f1f5f9;
  --color-surface:     #ffffff;
  --color-border:      #e2e8f0;
  --color-text:        #0f172a;
  --color-text-muted:  #64748b;
  --color-accent:      #2563eb;
  --color-accent-dark: #1d4ed8;
  --color-accent-bg:   #eff6ff;
  --color-error:       #dc2626;
  --color-error-bg:    #fef2f2;

  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   20px;

  --shadow-sm:  0 1px 3px rgba(0, 0, 0, .08);
  --shadow-md:  0 4px 16px rgba(0, 0, 0, .10);
  --shadow-lg:  0 8px 32px rgba(0, 0, 0, .12);

  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;

  --max-width:  900px;
  --nav-height: 60px;
}

/* ── Reset & base ────────────────────────────────────────────────────────── */

/* Guarantee [hidden] always wins over class-level display (Safari omits !important in UA sheet) */
[hidden] { display: none !important; }

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
}

img { display: block; max-width: 100%; }

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 3px;
}

button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

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

/* ── Navigation ──────────────────────────────────────────────────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  gap: 1rem;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

.nav__logo {
  width: 28px;
  height: 28px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.nav__links {
  list-style: none;
  display: flex;
  gap: .25rem;
}

.nav__link {
  padding: .375rem .75rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color .15s, background .15s;
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-accent);
  background: var(--color-accent-bg);
  text-decoration: none;
}

/* ── Main layout ─────────────────────────────────────────────────────────── */
.main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* ── Search section ──────────────────────────────────────────────────────── */
.search-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .75rem;
}

.search-form {
  display: flex;
  gap: .75rem;
  width: 100%;
  max-width: 600px;
}

.search-input-wrap {
  position: relative;
  flex: 1;
}

.search-icon {
  position: absolute;
  left: .85rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
  pointer-events: none;
}

.search-input {
  width: 100%;
  height: 48px;
  padding: 0 1rem 0 2.75rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color .15s, box-shadow .15s;
}

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

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

.search-input.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, .12);
}

.search-attribution {
  font-size: .8rem;
  color: var(--color-text-muted);
}

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  height: 48px;
  padding: 0 1.5rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: .95rem;
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s, box-shadow .15s, transform .1s;
  user-select: none;
}

.btn:active { transform: scale(.98); }

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--color-accent-dark);
  box-shadow: var(--shadow-md);
}

.btn--primary:disabled {
  opacity: .65;
  cursor: not-allowed;
}

/* ── Loading state ───────────────────────────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 3rem 0;
  color: var(--color-text-muted);
  font-size: .95rem;
}

.loading__spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
}

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

/* ── Error card ──────────────────────────────────────────────────────────── */
.error-card {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: 1rem 1.25rem;
  background: var(--color-error-bg);
  border: 1px solid #fecaca;
  border-radius: var(--radius-md);
  color: var(--color-error);
}

.error-card__icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.error-card__message {
  font-size: .95rem;
  font-weight: 500;
}

/* ── Current weather card ────────────────────────────────────────────────── */
.weather-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow-md);
}

.weather-card__header {
  margin-bottom: 1.5rem;
}

.weather-card__city {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.weather-card__date {
  margin-top: .25rem;
  font-size: .9rem;
  color: var(--color-text-muted);
}

.weather-card__body {
  display: flex;
  gap: 2rem;
  align-items: center;
  justify-content: space-between;
}

/* Left column — icon on left, temp+desc on right */
.weather-card__main {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 1rem;
}

.weather-card__main-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .2rem;
}

.weather-card__icon {
  width: 112px;
  height: 112px;
  object-fit: contain;
}

.weather-card__temp-wrap {
  display: flex;
  align-items: flex-start;
  line-height: 1;
}

.weather-card__temp {
  font-size: 3.5rem;
  font-weight: 700;
  letter-spacing: -2px;
}

.weather-card__unit {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: .4rem;
  color: var(--color-text-muted);
}

.weather-card__desc {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: capitalize;
  text-align: left;
}

/* Right column — stats vertical list */
.weather-card__stats {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  flex: 0 0 45%;
  min-width: 0;
}

.stat {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: .75rem;
  padding: .6rem 1rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.stat__icon {
  width: 18px;
  height: 18px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.stat__label {
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--color-text-muted);
  flex: 1;
}

.stat__value {
  font-size: .95rem;
  font-weight: 700;
  color: var(--color-text);
}

/* ── 7-Day Forecast ──────────────────────────────────────────────────────── */
.forecast-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 2rem;
  box-shadow: var(--shadow-md);
}

.forecast-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.forecast-title {
  font-size: 1.1rem;
  font-weight: 700;
}

/* C/F toggle */
.unit-toggle {
  display: flex;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.unit-btn {
  padding: .3rem .75rem;
  border: none;
  background: transparent;
  font-size: .85rem;
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background .15s, color .15s;
}

.unit-btn--active {
  background: var(--color-accent);
  color: #fff;
}

.forecast-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(90px, 1fr));
  gap: .5rem;
}

/* Individual forecast card */
.forecast-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .35rem;
  padding: 1rem .75rem;
  background: var(--color-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  text-align: center;
}

.forecast-card__day {
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--color-text-muted);
}

.forecast-card__icon {
  width: 52px;
  height: 52px;
  object-fit: contain;
}

.forecast-card__temp {
  font-size: .9rem;
  font-weight: 700;
}

.forecast-high { color: #DC2626; }
.forecast-low  { color: #3B82F6; }

.forecast-card__desc {
  font-size: .72rem;
  color: var(--color-text-muted);
  text-transform: capitalize;
  line-height: 1.3;
}

/* ── Footer ──────────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 1.5rem 1.75rem;
  margin-top: auto;
}

.footer-cards {
  max-width: var(--max-width);
  margin: 0 auto 1.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.footer-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .5rem;
}

.footer-card__icon {
  width: 28px;
  height: 28px;
  color: #22c55e;
}

.footer-card__title {
  font-size: .9rem;
  font-weight: 700;
}

.footer-card__text {
  font-size: .82rem;
  color: var(--color-text-muted);
  line-height: 1.45;
}

.footer-copy {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
  font-size: .78rem;
  color: var(--color-text-muted);
  padding-top: 1.25rem;
  border-top: 1px solid var(--color-border);
}

/* ── About page ──────────────────────────────────────────────────────────── */
.about-hero {
  text-align: center;
  padding: 2rem 0 1rem;
}

.about-hero__icon {
  width: 64px;
  height: 64px;
  color: var(--color-accent);
  margin: 0 auto 1.25rem;
}

.about-hero__title {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: .5rem;
}

.about-hero__subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto;
}

.about-section {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow-md);
}

.about-section__title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: .6rem;
}

.about-section__title-icon {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
  flex-shrink: 0;
}

.about-section__body {
  font-size: .925rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.about-section__body:last-child { margin-bottom: 0; }

.steps {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.step__number {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-accent-bg);
  color: var(--color-accent);
  font-weight: 700;
  font-size: .9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step__body { padding-top: .3rem; }

.step__label {
  font-weight: 600;
  font-size: .95rem;
  margin-bottom: .2rem;
}

.step__desc {
  font-size: .875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: .75rem;
}

.tech-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .65rem .9rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: .875rem;
  font-weight: 500;
}

.tech-item__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

.privacy-list {
  display: flex;
  flex-direction: column;
  gap: .6rem;
}

.privacy-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-size: .9rem;
}

.privacy-item__icon {
  width: 18px;
  height: 18px;
  color: #22c55e;
  flex-shrink: 0;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .weather-card__body { flex-direction: column; }

  .forecast-grid { grid-template-columns: repeat(4, 1fr); }

  .footer-cards { grid-template-columns: 1fr; }

  .search-form { flex-direction: column; }

  .btn--primary { width: 100%; }

  .about-hero__title { font-size: 1.5rem; }
  .about-section { padding: 1.25rem; }
}

@media (max-width: 420px) {
  .forecast-grid { grid-template-columns: repeat(3, 1fr); }
}