/* ==========================================================================
   Enugu Quiz Competition Countdown — styles
   Patterns: gradient_color_rich · kinetic_typography ·
             scroll_triggered_reveals · morphing_button_interactions
   Mobile-first. Nigerian green/white palette with energetic accents.
   ========================================================================== */

/* ---------- Design tokens ---------- */
:root {
  --color-primary-green: #008751; /* Nigerian green */
  --color-primary-green-dark: #00623a;
  --color-white: #ffffff;
  --color-accent-orange: #ff6b35;
  --color-accent-purple: #6b35ff;

  --color-ink: #0d1f17;
  --color-muted: #4a5b52;
  --color-surface: #ffffff;
  --color-surface-alt: #f2f8f4;
  --color-border: rgba(13, 31, 23, 0.1);

  --spacing-unit: 8px;

  --font-primary: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  --font-display: "Segoe UI", system-ui, -apple-system, sans-serif;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 28px;
  --radius-pill: 999px;

  --shadow-sm: 0 4px 12px rgba(13, 31, 23, 0.08);
  --shadow-md: 0 12px 32px rgba(13, 31, 23, 0.14);
  --shadow-glow: 0 12px 40px rgba(0, 135, 81, 0.35);

  --maxw: 1120px;
}

/* ---------- Reset ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: var(--font-primary);
  line-height: 1.5;
  color: var(--color-ink);
  background: linear-gradient(
    180deg,
    var(--color-surface) 0%,
    var(--color-surface-alt) 100%
  );
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
  padding: 0;
}

/* ---------- Typography scale (mobile-first) ---------- */
h1,
h2,
h3 {
  font-family: var(--font-display);
  line-height: 1.1;
  font-weight: 800;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.25rem;
}

p {
  font-size: 1rem;
}

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: calc(var(--spacing-unit) * 3);
}

.section {
  padding-block: calc(var(--spacing-unit) * 8);
}

.grid {
  display: grid;
  gap: calc(var(--spacing-unit) * 3);
}

.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;
}

/* ---------- Accessibility: skip link + focus ---------- */
.skip-link {
  position: absolute;
  left: calc(var(--spacing-unit) * 2);
  top: -3rem;
  z-index: 100;
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
  background: var(--color-ink);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: calc(var(--spacing-unit) * 2);
}

:focus-visible {
  outline: 3px solid var(--color-accent-purple);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ==========================================================================
   Header / navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: calc(var(--spacing-unit) * 9);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 1.5);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: calc(var(--spacing-unit) * 5.5);
  height: calc(var(--spacing-unit) * 5.5);
  border-radius: var(--radius-md);
  background: linear-gradient(
    135deg,
    var(--color-primary-green),
    var(--color-accent-purple)
  );
  color: var(--color-white);
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand__title {
  font-weight: 800;
  font-size: 1.05rem;
}

.brand__subtitle {
  font-size: 0.75rem;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-unit) * 3);
  font-weight: 600;
}

.site-nav a {
  color: var(--color-muted);
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--color-primary-green);
}

.site-nav__cta {
  padding: calc(var(--spacing-unit)) calc(var(--spacing-unit) * 2);
  border-radius: var(--radius-pill);
  background: var(--color-primary-green);
  color: var(--color-white) !important;
}

.site-nav__cta:hover {
  background: var(--color-primary-green-dark);
}

/* Hide the text links on small screens; brand + CTA stay */
.site-nav__list li:not(:last-child) {
  display: none;
}

/* ==========================================================================
   Hero + kinetic countdown
   ========================================================================== */
.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: calc(var(--spacing-unit) * 9) calc(var(--spacing-unit) * 10);
  text-align: center;
  color: var(--color-white);
  background:
    radial-gradient(
      circle at 20% 20%,
      rgba(255, 107, 53, 0.55) 0,
      transparent 45%
    ),
    radial-gradient(
      circle at 85% 15%,
      rgba(107, 53, 255, 0.5) 0,
      transparent 45%
    ),
    radial-gradient(
      circle at 50% 100%,
      rgba(255, 255, 255, 0.35) 0,
      transparent 55%
    ),
    linear-gradient(
      160deg,
      var(--color-primary-green) 0%,
      var(--color-primary-green-dark) 100%
    );
}

/* Animated blob shapes */
.hero__blobs {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.blob {
  position: absolute;
  width: 22rem;
  height: 22rem;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.5;
  mix-blend-mode: screen;
  animation: blob 8s ease-in-out infinite;
}

.blob--green {
  top: -6rem;
  left: -6rem;
  background: #22d67f;
}

.blob--orange {
  top: 4rem;
  right: -8rem;
  background: var(--color-accent-orange);
  animation-delay: 2s;
}

.blob--purple {
  bottom: -8rem;
  left: 40%;
  background: var(--color-accent-purple);
  animation-delay: 4s;
}

.hero__content {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing-unit) * 2.5);
}

.hero__eyebrow {
  display: inline-block;
  padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 2);
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.3);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero__title {
  max-width: 16ch;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
}

.hero__title-accent {
  background: linear-gradient(90deg, #ffd166, var(--color-accent-orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__lede {
  max-width: 52ch;
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.92);
}

.hero__date {
  color: rgba(255, 255, 255, 0.9);
  font-size: 1rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--spacing-unit) * 2);
  justify-content: center;
}

/* Countdown grid */
.countdown {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr)) ;
  align-items: start;
  gap: calc(var(--spacing-unit) * 0.5);
  width: 100%;
  max-width: 520px;
  margin-block: calc(var(--spacing-unit) * 2);
}

.countdown__unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing-unit));
  padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit));
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-md);
  backdrop-filter: blur(6px);
}

.countdown__value {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  transform-origin: center;
}

/* kinetic flip effect on number change */
.countdown__value.is-flipping {
  animation: flipIn 0.45s ease;
}

.countdown__label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.85);
}

.countdown__sep {
  display: none;
}

.countdown__ended {
  grid-column: 1 / -1;
  font-size: 1.15rem;
  font-weight: 700;
}

/* ==========================================================================
   Buttons — morphing interactions
   ========================================================================== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: calc(var(--spacing-unit));
  padding: calc(var(--spacing-unit) * 1.75) calc(var(--spacing-unit) * 3.5);
  border: none;
  border-radius: var(--radius-pill);
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease,
    background 0.3s ease, color 0.3s ease;
}

.btn--lg {
  padding: calc(var(--spacing-unit) * 2.25) calc(var(--spacing-unit) * 5);
  font-size: 1.125rem;
}

.btn--primary {
  background: linear-gradient(
    135deg,
    var(--color-accent-orange),
    var(--color-accent-purple)
  );
  color: var(--color-white);
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 18px 48px rgba(107, 53, 255, 0.45);
}

.btn--primary:active {
  transform: translateY(0) scale(0.97);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.16);
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: var(--color-white);
}

.btn--ghost:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.26);
}

/* morph feedback pieces (hidden by default) */
.btn__spinner,
.btn__check {
  display: none;
}

.btn__spinner {
  width: 1.15em;
  height: 1.15em;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: var(--color-white);
}

/* loading state */
.btn.is-loading {
  pointer-events: none;
  color: transparent;
}

.btn.is-loading .btn__label {
  opacity: 0;
}

.btn.is-loading .btn__spinner {
  display: block;
  position: absolute;
  animation: spin 0.7s linear infinite;
}

/* success state */
.btn.is-success {
  pointer-events: none;
  background: linear-gradient(
    135deg,
    var(--color-primary-green),
    #22d67f
  );
  color: var(--color-white);
}

.btn.is-success .btn__label {
  opacity: 0;
}

.btn.is-success .btn__check {
  display: block;
  position: absolute;
  font-size: 1.4em;
  font-weight: 800;
  animation: pop 0.35s ease;
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section__head {
  max-width: 60ch;
  margin-inline: auto;
  margin-bottom: calc(var(--spacing-unit) * 5);
  text-align: center;
}

.section__eyebrow {
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-orange);
  margin-bottom: calc(var(--spacing-unit));
}

.section__title {
  color: var(--color-ink);
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.section__lede {
  color: var(--color-muted);
  font-size: 1.0625rem;
}

.section--prizes {
  background: var(--color-surface-alt);
}

/* Cards */
.card {
  padding: calc(var(--spacing-unit) * 4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
}

.card__icon {
  display: inline-grid;
  place-items: center;
  width: calc(var(--spacing-unit) * 7);
  height: calc(var(--spacing-unit) * 7);
  border-radius: var(--radius-md);
  background: linear-gradient(
    135deg,
    rgba(0, 135, 81, 0.12),
    rgba(107, 53, 255, 0.12)
  );
  font-size: 1.75rem;
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.card__title {
  margin-bottom: calc(var(--spacing-unit));
}

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

/* Prizes */
.prize {
  position: relative;
  padding: calc(var(--spacing-unit) * 4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.prize--featured {
  background: linear-gradient(
    160deg,
    var(--color-primary-green),
    var(--color-primary-green-dark)
  );
  color: var(--color-white);
  box-shadow: var(--shadow-glow);
}

.prize__ribbon {
  display: inline-block;
  padding: calc(var(--spacing-unit) * 0.5) calc(var(--spacing-unit) * 2);
  margin-bottom: calc(var(--spacing-unit) * 1.5);
  border-radius: var(--radius-pill);
  background: var(--color-accent-orange);
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.prize__rank {
  font-weight: 700;
  color: var(--color-accent-orange);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.85rem;
}

.prize--featured .prize__rank {
  color: #ffd166;
}

.prize__amount {
  font-family: var(--font-display);
  font-size: 2.25rem;
  font-weight: 800;
  margin-block: calc(var(--spacing-unit));
}

.prize__list {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit));
  text-align: left;
  color: var(--color-muted);
}

.prize--featured .prize__list {
  color: rgba(255, 255, 255, 0.9);
}

.prize__list li {
  position: relative;
  padding-left: calc(var(--spacing-unit) * 3);
}

.prize__list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary-green);
  font-weight: 800;
}

.prize--featured .prize__list li::before {
  color: #ffd166;
}

/* Rules */
.rules-block {
  padding: calc(var(--spacing-unit) * 4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 6px solid var(--color-primary-green);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.rules-block:nth-child(2) {
  border-left-color: var(--color-accent-purple);
}

.rules-block__title {
  margin-bottom: calc(var(--spacing-unit) * 2);
}

.rules-list {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit) * 1.5);
  color: var(--color-muted);
}

.rules-list li {
  position: relative;
  padding-left: calc(var(--spacing-unit) * 3.5);
}

.rules-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent-orange);
  font-weight: 800;
}

/* Registration CTA */
.section--register {
  color: var(--color-white);
  background:
    radial-gradient(
      circle at 15% 30%,
      rgba(107, 53, 255, 0.6) 0,
      transparent 50%
    ),
    radial-gradient(
      circle at 85% 70%,
      rgba(255, 107, 53, 0.55) 0,
      transparent 50%
    ),
    linear-gradient(
      135deg,
      var(--color-primary-green),
      var(--color-primary-green-dark)
    );
}

.register__inner {
  max-width: 60ch;
  margin-inline: auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing-unit) * 2.5);
}

.register__title {
  color: var(--color-white);
}

.register__text {
  font-size: 1.125rem;
  color: rgba(255, 255, 255, 0.92);
}

.register__note {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.8);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.8);
}

.site-footer__inner {
  display: grid;
  gap: calc(var(--spacing-unit) * 4);
  padding-block: calc(var(--spacing-unit) * 7);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit) * 1.5);
}

.site-footer__tagline {
  max-width: 34ch;
  color: rgba(255, 255, 255, 0.65);
}

.site-footer__heading {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-white);
  margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.site-footer__contact {
  font-style: normal;
  line-height: 1.9;
}

.site-footer a:hover {
  color: var(--color-accent-orange);
}

.social {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit));
}

.site-footer__bar {
  padding-block: calc(var(--spacing-unit) * 3);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
}

/* ==========================================================================
   Scroll-reveal utility
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  will-change: opacity, transform;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children of a grid for rhythm */
.grid .reveal:nth-child(2) {
  transition-delay: 0.1s;
}
.grid .reveal:nth-child(3) {
  transition-delay: 0.2s;
}

/* ==========================================================================
   Keyframes
   ========================================================================== */
@keyframes blob {
  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }
  25% {
    transform: translate(20px, -30px) scale(1.1);
  }
  50% {
    transform: translate(-20px, 20px) scale(0.9);
  }
  75% {
    transform: translate(30px, 10px) scale(1.05);
  }
}

@keyframes flipIn {
  0% {
    transform: rotateX(-90deg);
    opacity: 0;
  }
  60% {
    transform: rotateX(20deg);
    opacity: 1;
  }
  100% {
    transform: rotateX(0deg);
    opacity: 1;
  }
}

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

@keyframes pop {
  0% {
    transform: scale(0.3);
    opacity: 0;
  }
  70% {
    transform: scale(1.25);
    opacity: 1;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ==========================================================================
   Responsive breakpoints
   ========================================================================== */
@media (min-width: 768px) {
  h1 {
    font-size: 4rem;
  }
  h2 {
    font-size: 3rem;
  }
  h3 {
    font-size: 1.5rem;
  }
  p {
    font-size: 1.125rem;
  }

  .site-nav__list li:not(:last-child) {
    display: list-item;
  }

  .countdown {
    gap: calc(var(--spacing-unit) * 1.5);
  }

  .countdown__value {
    font-size: 5rem;
  }

  .grid--2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .site-footer__inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .countdown__value {
    font-size: 6rem;
  }

  .prize--featured {
    transform: scale(1.06);
  }
}

@media (min-width: 1440px) {
  .section {
    padding-block: calc(var(--spacing-unit) * 12);
  }
}

/* ==========================================================================
   Reduced motion — disable non-essential animation
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .blob {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}