/* ============================================================
   Youth Digital Futures Summit 2026
   Design language: SDG Digital (ITU-UNDP) — sdg-digital.org
   ============================================================ */

:root {
  --color-accent: #006eb5;          /* SDG Digital blue */
  --color-accent-dark: #00518a;
  --color-accent-soft: #e8f3fa;
  --color-ink: #232e3d;             /* dark navy */
  --color-ink-soft: #5d6c7e;
  --color-bg: #ffffff;
  --color-bg-alt: rgba(247, 247, 247, 0.85);
  --color-border: #e3e7eb;
  --color-navy: #232e3d;
  --color-success: #1f9d55;
  --color-error: #d64545;

  /* SDG goal accent palette */
  --sdg-red: #e5243f;
  --sdg-orange: #fd6925;
  --sdg-yellow: #fcc30b;
  --sdg-green: #4d9f39;
  --sdg-cyan: #27bde2;
  --sdg-blue: #006eb5;
  --sdg-navy: #15486b;
  --sdg-magenta: #dd1467;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 3px rgba(35, 46, 61, 0.08);
  --shadow-md: 0 12px 32px rgba(35, 46, 61, 0.12);
  --max-width: 1100px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Avenir Next", Avenir, "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* Faint SDG planets graphic as a site-wide background layer (~10% opacity) */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: url("../images/sdg-digital-hero.svg") center/cover no-repeat;
  opacity: 0.1;
  pointer-events: none;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(var(--max-width), 92%);
  margin: 0 auto;
}

/* ---------- Header / nav ---------- */

.site-header {
  background: #fafafa;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-ink);
  font-weight: 700;
  font-size: 0.98rem;
  line-height: 1.25;
}

.brand:hover {
  text-decoration: none;
}

.brand img {
  height: 40px;
  width: auto;
}

.brand .brand-accent {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  list-style: none;
}

.nav-links a {
  color: var(--color-ink);
  font-weight: 600;
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-links a.active {
  color: var(--color-accent);
  box-shadow: inset 0 -2px 0 var(--color-accent);
  padding-bottom: 2px;
}

@media (max-width: 860px) {
  .nav {
    flex-direction: column;
    gap: 0.75rem;
  }

  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.9rem 1.2rem;
  }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn-primary:hover {
  background: var(--color-accent-dark);
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border-color: #c9d2db;
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

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

.btn-light:hover {
  background: var(--color-accent-soft);
  text-decoration: none;
}

.btn-block {
  display: block;
  width: 100%;
}

/* ---------- Hero ---------- */

.hero {
  padding: 4.5rem 0 5rem;
  text-align: center;
}

.hero-pic {
  max-width: 480px;
  margin: 0 auto 2.5rem;
}

.hero-pic img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.hero-logo {
  max-width: 660px;
  margin: 0 auto 2.2rem;
}

.hero-logo img {
  width: 100%;
  height: auto;
}

.hero .eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 1.1rem;
}

.hero h1 {
  font-size: clamp(1.9rem, 5vw, 3.3rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0 auto 0.7rem;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.6vw, 1.45rem);
  font-weight: 700;
  color: var(--color-accent-dark);
  max-width: 34ch;
  margin: 0 auto 1.4rem;
}

.hero p.lede {
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  max-width: 62ch;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.9rem;
  align-items: center;
}

.hero-meta {
  margin-top: 2.2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem 1.6rem;
  color: var(--color-ink-soft);
  font-size: 0.88rem;
  font-weight: 600;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.hero-meta span::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

.hero-meta span:nth-child(2)::before { background: var(--sdg-green); }
.hero-meta span:nth-child(3)::before { background: var(--sdg-orange); }



/* ---------- Partner strip ---------- */

.partners {
  padding: 3.5rem 0 3rem;
}

.partner-wrap {
  text-align: center;
}

.partner-wrap .section-label {
  margin-bottom: 1rem;
}

.partner-logo {
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- Sections ---------- */

.section {
  padding: 4.5rem 0;
}

.section-alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-head {
  max-width: 62ch;
  margin-bottom: 2.5rem;
}

.section-label {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 0.6rem;
}

.section-head h2 {
  font-size: clamp(1.6rem, 3vw, 2.15rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  margin-bottom: 0.6rem;
}

.section-head p {
  color: var(--color-ink-soft);
}

/* ---------- Cards / grid ---------- */

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: var(--shadow-sm);
}

.card h3 {
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--color-ink-soft);
  font-size: 0.96rem;
}

/* Pillar cards — each with an SDG accent */

.pillar {
  border-top: 4px solid var(--sdg-blue);
}

.pillar:nth-child(2) {
  border-top-color: var(--sdg-green);
}

.pillar:nth-child(3) {
  border-top-color: var(--sdg-yellow);
}

.pillar .pillar-num {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #fff;
  background: var(--sdg-blue);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.9rem;
}

.pillar:nth-child(2) .pillar-num { background: var(--sdg-green); }
.pillar:nth-child(3) .pillar-num { background: var(--sdg-yellow); color: var(--color-ink); }

/* ---------- Objectives ---------- */

.objectives {
  list-style: none;
  columns: 2;
  column-gap: 3rem;
}

@media (max-width: 720px) {
  .objectives {
    columns: 1;
  }
}

.objectives li {
  break-inside: avoid;
  display: flex;
  gap: 0.7rem;
  align-items: flex-start;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.96rem;
  color: var(--color-ink-soft);
}

.objectives li::before {
  content: "";
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 0.2rem;
  border-radius: 50%;
  background: var(--color-accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%23006eb5' d='M6.6 12.4 2.8 8.6l1.4-1.4 2.4 2.4 5.2-5.2 1.4 1.4z'/%3E%3C/svg%3E") center/14px no-repeat;
}

/* Tag list (declaration topics) */

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.tag-list li {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  border-radius: 999px;
  padding: 0.38rem 0.9rem;
}

/* ---------- Programme ---------- */

.programme {
  list-style: none;
  display: grid;
  gap: 0.9rem;
}

.programme li {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.15rem 1.3rem;
  box-shadow: var(--shadow-sm);
}

.programme .num {
  flex: 0 0 2.6rem;
  height: 2.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--sdg-blue);
  color: #fff;
  font-weight: 800;
  font-size: 0.95rem;
}

.programme li:nth-child(2) .num { background: var(--sdg-cyan); }
.programme li:nth-child(3) .num { background: var(--sdg-green); }
.programme li:nth-child(4) .num { background: var(--sdg-orange); }
.programme li:nth-child(5) .num { background: var(--sdg-red); }
.programme li:nth-child(6) .num { background: var(--sdg-navy); }
.programme li:nth-child(7) .num { background: var(--sdg-magenta); }

.programme .title {
  font-weight: 700;
  color: var(--color-ink);
}

.programme .sub {
  font-weight: 600;
  color: var(--color-accent-dark);
  font-size: 0.93rem;
}

.programme .desc {
  color: var(--color-ink-soft);
  font-size: 0.94rem;
  margin-top: 0.15rem;
}

/* ---------- Discussion areas ---------- */

.areas {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.3rem;
}

.areas li {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  box-shadow: var(--shadow-sm);
}

.areas h3 {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 0.8rem;
}

.areas .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.areas .tags span {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent-dark);
  background: var(--color-accent-soft);
  border-radius: 999px;
  padding: 0.24rem 0.65rem;
}

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--color-accent);
  color: #fff;
  text-align: center;
  padding: 5.5rem 0;
}

.cta-band blockquote {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
  max-width: 26ch;
  margin: 0 auto 0.7rem;
}

.cta-band .attribution {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.92rem;
  margin-bottom: 2rem;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-navy);
  color: #a9b6c4;
  padding: 3.5rem 0 0;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.8rem;
}

@media (max-width: 760px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.site-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.9rem;
}

.site-footer .footer-brand img {
  height: 40px;
  width: auto;
}

.footer-brand-col p {
  color: #a9b6c4;
  max-width: 42ch;
  font-size: 0.88rem;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: grid;
  gap: 0.55rem;
}

.site-footer a {
  color: #c9d4df;
}

.site-footer a:hover {
  color: #fff;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.2rem 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.4rem 1.5rem;
  font-size: 0.82rem;
  color: #8fa0b2;
}

/* ---------- Registration page ---------- */

.page-hero {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: 3rem 0;
}

.page-hero .hero-logo {
  max-width: 460px;
  margin: 0 0 1.6rem;
}

.page-hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  margin-bottom: 0.4rem;
}

.page-hero p {
  color: var(--color-ink-soft);
}

.register-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}

/* Info cards below the full-width form */
.register-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

/* Form */

.form-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.form-group .hint {
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  margin-top: 0.3rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--color-ink);
  background: #fff;
  border: 1.5px solid #c9d2db;
  border-radius: var(--radius-sm);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.form-group input.invalid,
.form-group select.invalid,
.form-group textarea.invalid {
  border-color: var(--color-error);
}

.form-group .error-msg {
  display: none;
  color: var(--color-error);
  font-size: 0.82rem;
  margin-top: 0.3rem;
}

.form-group.has-error .error-msg {
  display: block;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 520px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: 0.9rem;
  color: var(--color-ink-soft);
}

.checkbox-group input {
  width: auto;
  margin-top: 0.2rem;
  accent-color: var(--color-accent);
}

/* Sidebar card */

.side-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.side-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.9rem;
}

.side-card ul {
  list-style: none;
}

.side-card ul li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.92rem;
  color: var(--color-ink-soft);
}

.side-card ul li:last-child {
  border-bottom: none;
}

.side-card ul li strong {
  color: var(--color-ink);
}

/* ---------- Contact page ---------- */

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 860px) {
  .contact-layout {
    grid-template-columns: 1fr;
  }
}

.contact-info {
  display: grid;
  gap: 1rem;
}

.info-item {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.15rem 1.4rem;
  box-shadow: var(--shadow-sm);
}

.info-item h3 {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: var(--color-accent);
  margin-bottom: 0.3rem;
}

.info-item p {
  color: var(--color-ink);
  font-weight: 600;
  font-size: 0.96rem;
}

.info-item a {
  color: var(--color-accent);
}

.social-row {
  display: flex;
  gap: 0.7rem;
  margin-top: 0.4rem;
}

.social-icon {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  transition: background 0.15s ease, color 0.15s ease;
}

.social-icon:hover {
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
}

.social-icon svg {
  width: 21px;
  height: 21px;
  fill: currentColor;
}

/* Footer social icons */

.footer-social {
  display: flex;
  gap: 0.55rem;
  margin-top: 1rem;
}

.footer-social a {
  width: 34px;
  height: 34px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  color: #c9d4df;
}

.footer-social a:hover {
  background: var(--color-accent);
  color: #fff;
}

.footer-social svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* ---------- EOI form (register page) ---------- */

.form-section {
  margin: 2.2rem 0 1.5rem;
  padding-top: 1.7rem;
  border-top: 1px solid var(--color-border);
}

.form-section:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.form-section h2 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--color-ink);
}

.form-section .num {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.88rem;
  flex-shrink: 0;
}

.form-section p.intro {
  color: var(--color-ink-soft);
  font-size: 0.9rem;
  margin: 0.35rem 0 1.15rem;
}

.form-group label .opt {
  font-weight: 400;
  color: var(--color-ink-soft);
}

.option-list {
  display: grid;
  gap: 0.45rem;
}

.option-list label {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--color-ink);
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: #fff;
  cursor: pointer;
  transition: border-color 0.15s ease;
}

.option-list label:hover {
  border-color: var(--color-accent);
}

.option-list input {
  width: auto;
  margin-top: 0.2rem;
  accent-color: var(--color-accent);
}

.form-group input[type="file"] {
  padding: 0.55rem 0.7rem;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}

.checkbox-group {
  flex-wrap: wrap;
}

.checkbox-group .error-msg {
  flex-basis: 100%;
}

.word-count {
  font-size: 0.78rem;
  color: var(--color-ink-soft);
  margin-top: 0.3rem;
}

.word-count.warn {
  color: var(--color-error);
  font-weight: 600;
}

.speaker-section.is-hidden,
#other-topic-group.is-hidden {
  display: none;
}

/* Success / error notices */

.notice {
  display: none;
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  margin-bottom: 1.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.notice.success {
  background: #e6f6ee;
  color: var(--color-success);
  border: 1px solid #bfe8d0;
}

.notice.error {
  background: #fdecec;
  color: var(--color-error);
  border: 1px solid #f5c6c6;
}

/* ---------- Utility ---------- */

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }