/* ============================================================
   XmasDev Conference — Main Stylesheet
   ============================================================ */

/* ---- CSS Custom Properties --------------------------------- */
:root {
  --color-bg: #0d1117;
  --color-bg-alt: #161b22;
  --color-surface: #1e2530;
  --color-surface-hover: #252d3a;
  --color-border: #30363d;

  --color-primary: #e63946;
  --color-primary-light: #ff6b74;
  --color-secondary: #2dc653;
  --color-accent: #f4d03f;

  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-text-light: #c9d1d9;

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

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

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);

  --transition: 0.2s ease;
  --max-width: 1200px;
}

/* ---- Reset & Base ------------------------------------------ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color-primary-light);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--color-primary);
}

ul {
  list-style: none;
}

/* ---- Typography -------------------------------------------- */
h1, h2, h3, h4 {
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; }

p {
  color: var(--color-text-light);
}

/* ---- Layout helpers --------------------------------------- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

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

.section__header {
  text-align: center;
  margin-bottom: 3rem;
}

.section__header h2 {
  margin-bottom: 0.75rem;
}

.section__header p {
  max-width: 600px;
  margin: 0 auto;
  color: var(--color-text-muted);
}

/* ---- Navigation ------------------------------------------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.9);
  backdrop-filter: blur(12px);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.navbar__logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 800;
  font-size: 1.3rem;
  color: var(--color-text);
  text-decoration: none;
}

.navbar__logo .logo-icon {
  font-size: 1.6rem;
}

.navbar__logo .logo-accent {
  color: var(--color-primary);
}

.navbar__logo-img {
  height: 42px;
  width: auto;
  display: block;
}

.navbar__links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.navbar__links a {
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition);
}

.navbar__links a:hover,
.navbar__links a.active {
  color: var(--color-text);
}

.navbar__cta {
  background: var(--color-primary);
  color: #fff !important;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-sm);
  font-weight: 600 !important;
}

.navbar__cta:hover {
  background: var(--color-primary-light);
  color: #fff !important;
}

/* Hamburger */
.navbar__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.navbar__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- Hero -------------------------------------------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 5rem 0 5rem;
  text-align: center;
  background-image: url('../assets/xmasdev-hero.png');
  background-size: cover;
  background-position: center 35%;
  background-repeat: no-repeat;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 65% 60% at 50% 42%,
              rgba(13, 17, 23, 0.82) 0%,
              rgba(13, 17, 23, 0.35) 100%),
    linear-gradient(180deg,
              rgba(13, 17, 23, 0.2) 0%,
              rgba(13, 17, 23, 0.45) 55%,
              rgba(13, 17, 23, 0.95) 100%);
  pointer-events: none;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(230, 57, 70, 0.15);
  border: 1px solid rgba(230, 57, 70, 0.35);
  color: var(--color-primary-light);
  padding: 0.3rem 1rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.hero h1 {
  margin-bottom: 1.25rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}

.hero h1 .highlight {
  color: var(--color-primary-light);
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text);
  max-width: 560px;
  margin: 0 auto 2.5rem;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.7);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 3rem;
}

.hero__meta-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  font-weight: 500;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.7);
}

.hero__meta-item .icon {
  font-size: 1.2rem;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}

/* ---- Buttons ----------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-light);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(230, 57, 70, 0.4);
}

.btn--outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--outline:hover {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.btn[aria-disabled='true'] {
  opacity: 0.8;
}

.btn.btn--disabled,
.btn[aria-disabled='true'] {
  pointer-events: none;
  cursor: not-allowed;
}

.registration-status {
  margin-top: 0.85rem;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

/* ---- Stats bar --------------------------------------------- */
.stats {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  text-align: center;
}

.stats__item {
  padding: 2rem 1rem;
  border-right: 1px solid var(--color-border);
}

.stats__item:last-child {
  border-right: none;
}

.stats__number {
  display: block;
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.4rem;
}

.stats__label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ---- About cards ------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.about-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition);
}

.about-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-3px);
}

.about-card__icon {
  font-size: 2.2rem;
  margin-bottom: 1rem;
}

.about-card h3 {
  margin-bottom: 0.6rem;
}

/* ---- Feature section --------------------------------------- */
.feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.feature--reverse {
  direction: rtl;
}

.feature--reverse > * {
  direction: ltr;
}

.feature__content h2 {
  margin-bottom: 1rem;
}

.feature__content p {
  margin-bottom: 1.5rem;
}

.feature__list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.feature__list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-light);
}

.feature__list li::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  background: rgba(45, 198, 83, 0.15);
  color: var(--color-secondary);
  border-radius: 50%;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.feature__visual {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feature__visual-img {
  width: 100%;
  max-width: 240px;
  height: auto;
}

/* ---- CTA banner -------------------------------------------- */
.cta-banner {
  background: linear-gradient(135deg, var(--color-surface) 0%, rgba(230, 57, 70, 0.12) 100%);
  border: 1px solid rgba(230, 57, 70, 0.25);
  border-radius: var(--radius-lg);
  padding: 3.5rem 2rem;
  text-align: center;
  margin: 2rem 0;
}

.cta-banner h2 {
  margin-bottom: 1rem;
}

.cta-banner p {
  margin-bottom: 2rem;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.cfp-banner__deadline {
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

/* ---- Page hero (inner pages) ------------------------------- */
.page-hero {
  position: relative;
  overflow: hidden;
  background-image: url('../assets/xmasdev-hero.png');
  background-size: cover;
  background-position: center 40%;
  background-repeat: no-repeat;
  padding: 5rem 0 3.5rem;
  text-align: center;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 85% at 50% 45%,
              rgba(13, 17, 23, 0.78) 0%,
              rgba(13, 17, 23, 0.4) 100%),
    linear-gradient(180deg,
              rgba(13, 17, 23, 0.25) 0%,
              rgba(13, 17, 23, 0.55) 60%,
              rgba(13, 17, 23, 0.95) 100%);
  pointer-events: none;
}

.page-hero > .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  margin-bottom: 0.75rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}

.page-hero p {
  color: var(--color-text);
  max-width: 550px;
  margin: 0 auto;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.7);
}

/* ---- Agenda ----------------------------------------------- */
.agenda-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.filter-btn {
  padding: 0.4rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.agenda-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.timeslot {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 1rem;
  align-items: start;
}

.timeslot__time {
  padding-top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-align: right;
  white-space: nowrap;
}

.timeslot__sessions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.session-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.session-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.session-card--break {
  border-left-color: var(--color-text-muted);
  background: rgba(139, 148, 158, 0.05);
}

.session-card__track {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.session-card__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.session-card__speakers {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.session-card__speaker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.session-card__speaker img {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  object-fit: cover;
}

.session-card__description {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.agenda-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 2rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.agenda-tabs::-webkit-scrollbar { display: none; }

.agenda-tab {
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: all var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
}

.agenda-tab:hover,
.agenda-tab.active {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

.agenda-tracks-header {
  margin-bottom: 0;
}

.agenda-tracks-header__cell {
  background: rgba(56, 139, 253, 0.08);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: center;
}

.timeslot__sessions--tracks {
  display: grid;
  grid-template-columns: repeat(var(--tracks-count, 2), minmax(0, 1fr));
  gap: 0.75rem;
  align-items: start;
}

.timeslot--tracks-header {
  margin-bottom: 0.1rem;
}

.timeslot__time--spacer {
  padding-top: 0;
}

.timeslot__track-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.timeslot__track-col--full {
  grid-column: 1 / -1;
}

.timeslot__track-empty {
  min-height: 76px;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

/* Loading / error states */
.state-loading,
.state-error,
.state-empty {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--color-text-muted);
}

.state-loading .spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}

.state-error {
  color: var(--color-primary-light);
}

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

/* ---- Staff ------------------------------------------------- */
.staff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.staff-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}

.staff-card:hover {
  transform: translateY(-4px);
  border-color: rgba(230, 57, 70, 0.4);
}

.staff-card__photo {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1rem;
  border: 3px solid var(--color-border);
}

.staff-card__name {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.staff-card__role {
  font-size: 0.85rem;
  color: var(--color-primary-light);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.staff-card__bio {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
}

.staff-card__socials {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}

.staff-card__socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  transition: all var(--transition);
}

.staff-card__socials a:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ---- Sponsors ---------------------------------------------- */
.sponsors-current__header {
  margin-top: 4rem;
}

.sponsor-pack {
  margin-bottom: 2rem;
}

.sponsor-pack__header {
  margin-bottom: 2rem;
}

.sponsor-pack__subtitle {
  color: var(--color-text);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
  margin-bottom: 0.65rem;
}

.sponsor-pack__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.sponsor-pack__card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.4rem;
  transition: border-color var(--transition), transform var(--transition);
}

.sponsor-pack__card:hover {
  transform: translateY(-2px);
}

.sponsor-pack__price {
  color: var(--color-text);
  font-size: 1.35rem;
  font-weight: 800;
  margin-top: 0.35rem;
  margin-bottom: 0.25rem;
}

.sponsor-pack__card ul {
  list-style: disc;
  padding-left: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.sponsor-pack__card li {
  color: var(--color-text-light);
  font-size: 0.92rem;
}

.sponsor-pack__card--diamond {
  border-color: rgba(141, 216, 255, 0.4);
}

.sponsor-pack__card--platinum {
  border-color: rgba(226, 232, 240, 0.38);
}

.sponsor-pack__card--gold {
  border-color: rgba(244, 208, 63, 0.4);
}

.sponsor-pack__card--silver {
  border-color: rgba(184, 196, 208, 0.35);
}

#home-sponsors-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.home-sponsor-tier {
  margin-bottom: 0;
}

.sponsor-tier {
  margin-bottom: 3.5rem;
  --tier-card-min: 200px;
  --tier-card-max: 320px;
  --tier-logo-max: 180px;
  --tier-padding-y: 1.25rem;
  --tier-padding-x: 1.5rem;
}

.sponsor-tier__label {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.sponsor-tier__label h3 {
  white-space: nowrap;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
}

.sponsor-tier__label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.sponsor-tier--platinum .sponsor-tier__label h3 { color: #e2e8f0; }
.sponsor-tier--diamond  .sponsor-tier__label h3 { color: #8dd8ff; }
.sponsor-tier--gold     .sponsor-tier__label h3 { color: var(--color-accent); }
.sponsor-tier--silver   .sponsor-tier__label h3 { color: #b8c4d0; }

.sponsor-tier__grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  align-items: center;
  justify-content: center;
}

.sponsor-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--tier-padding-y) var(--tier-padding-x);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
  flex: 1;
  min-width: var(--tier-card-min);
  max-width: var(--tier-card-max);
}

.sponsor-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
}

.sponsor-card img {
  max-width: var(--tier-logo-max);
  height: auto;
  filter: brightness(0.9);
  transition: filter var(--transition);
}

.sponsor-card:hover img {
  filter: brightness(1);
}

.sponsor-card__name {
  font-weight: 600;
  color: var(--color-text);
}

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

/* Staircase sizing by tier: Diamond > Platinum > Gold > Silver */
.sponsor-tier--diamond {
  --tier-card-min: 360px;
  --tier-card-max: 520px;
  --tier-logo-max: 320px;
  --tier-padding-y: 2rem;
  --tier-padding-x: 2.5rem;
}

.sponsor-tier--platinum {
  --tier-card-min: 300px;
  --tier-card-max: 440px;
  --tier-logo-max: 260px;
  --tier-padding-y: 1.75rem;
  --tier-padding-x: 2.1rem;
}

.sponsor-tier--gold {
  --tier-card-min: 250px;
  --tier-card-max: 360px;
  --tier-logo-max: 220px;
  --tier-padding-y: 1.5rem;
  --tier-padding-x: 1.8rem;
}

.sponsor-tier--silver {
  --tier-card-min: 220px;
  --tier-card-max: 320px;
  --tier-logo-max: 180px;
  --tier-padding-y: 1.25rem;
  --tier-padding-x: 1.5rem;
}

.become-sponsor {
  background: var(--color-surface);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem 2rem;
  text-align: center;
}

.become-sponsor h3 {
  margin-bottom: 0.75rem;
}

.become-sponsor p {
  margin-bottom: 1.5rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
  color: var(--color-text-muted);
}

/* ---- Footer ------------------------------------------------ */
.footer {
  margin-top: auto;
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 3rem;
  padding: 4rem 1.5rem 3rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer__brand .navbar__logo {
  margin-bottom: 1rem;
}

.footer__brand .navbar__logo-img {
  height: 72px;
}

.footer__brand p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  max-width: 240px;
}

.footer__col h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer__col ul li a {
  color: var(--color-text-light);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer__col ul li a:hover {
  color: var(--color-text);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

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

/* ---- Snowflakes decoration --------------------------------- */
.snowflakes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.snowflake {
  position: absolute;
  top: -20px;
  color: rgba(255, 255, 255, 0.15);
  font-size: 1.2rem;
  animation: snowfall linear infinite;
  user-select: none;
}

@keyframes snowfall {
  0%   { transform: translateY(0) rotate(0deg);   opacity: 0.8; }
  100% { transform: translateY(110vh) rotate(360deg); opacity: 0; }
}

/* ---- Utilities --------------------------------------------- */
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge--red    { background: rgba(230, 57, 70, 0.15); color: var(--color-primary-light); }
.badge--green  { background: rgba(45, 198, 83, 0.15); color: var(--color-secondary); }
.badge--yellow { background: rgba(244, 208, 63, 0.15); color: var(--color-accent); }
.badge--blue   { background: rgba(56, 139, 253, 0.15); color: #79c0ff; }

/* ---- Responsive -------------------------------------------- */
@media (max-width: 900px) {
  .feature {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .feature--reverse { direction: ltr; }

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

@media (max-width: 640px) {
  .navbar__links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem;
    gap: 1.25rem;
  }

  .navbar__links.open {
    display: flex;
  }

  .navbar__hamburger {
    display: flex;
  }

  .navbar {
    position: sticky;
  }

  .timeslot {
    grid-template-columns: 70px 1fr;
  }

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

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

  .stats__item:nth-child(2) {
    border-right: none;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .section { padding: 3rem 0; }
  .hero { padding: 4rem 0 3rem; }

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

  .timeslot__time {
    text-align: left;
    padding-top: 0;
    padding-bottom: 0.25rem;
    font-size: 0.8rem;
  }

  .agenda-tracks-header {
    display: none;
  }
}