:root {
  --nanode-blue: #174a7e;
  --nanode-grey: #8c8d8d;
  --ku-red: #a96052;
  --off-white: #fafaf8;
  --text-dark: #17212b;
  --light-blue: rgba(255, 252, 248, 0.97);
  --surface: rgba(255, 252, 248, 0.94);
  --surface-border: rgba(23, 74, 126, 0.12);
  --callout: rgba(248, 242, 234, 0.97);
  --card-radius: 16px;
  --card-shadow: 0 12px 32px rgba(23, 74, 126, 0.08);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--off-white);
  background-image: var(--page-background-desktop);
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  color: var(--text-dark);
  line-height: 1.6;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: 0;
  background: rgba(250, 250, 248, 0.20);
  content: "";
  pointer-events: none;
}

header,
main,
footer {
  position: relative;
  z-index: 1;
}

.page-home {
  --page-background-desktop: url("images/background-home-desktop.webp");
  --page-background-tablet: url("images/background-home-tablet.webp");
  --page-background-mobile: url("images/background-home-mobile.webp");
}

.page-events {
  --page-background-desktop: url("images/background-events-desktop.webp");
  --page-background-tablet: url("images/background-events-tablet.webp");
  --page-background-mobile: url("images/background-events-mobile.webp");
}

.page-membership {
  --page-background-desktop: url("images/background-membership-desktop.webp");
  --page-background-tablet: url("images/background-membership-tablet.webp");
  --page-background-mobile: url("images/background-membership-mobile.webp");
}

.page-about {
  --page-background-desktop: url("images/background-about-desktop.webp");
  --page-background-tablet: url("images/background-about-tablet.webp");
  --page-background-mobile: url("images/background-about-mobile.webp");
}

.page-contact {
  --page-background-desktop: url("images/background-contact-desktop.webp");
  --page-background-tablet: url("images/background-contact-tablet.webp");
  --page-background-mobile: url("images/background-contact-mobile.webp");
}

.page-privacy {
  --page-background-desktop: url("images/background-about-desktop.webp");
  --page-background-tablet: url("images/background-about-tablet.webp");
  --page-background-mobile: url("images/background-about-mobile.webp");
}

/* HEADER */

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 6%;
  background-color: var(--white);
  border-bottom: 1px solid #e5e5e5;
}

.logo img {
  width: 125px;
  height: auto;
  display: block;
}

nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

nav a {
  text-decoration: none;
  color: var(--nanode-blue);
  font-weight: 700;
  font-size: 1rem;
}

nav a:hover {
  color: var(--ku-red);
}

/* MAIN */

main {
  width: min(1200px, 86%);
  margin: 0 auto;
}

/* HERO */

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 50px;
  align-items: start;
  padding: 70px 0 60px;
}

.hero-left {
  min-width: 0;
  padding: 34px 38px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 14px;
  box-shadow: 0 10px 28px rgba(23, 74, 126, 0.07);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.hero-left h1 {
  margin: 0 0 24px;
  font-size: clamp(2.3rem, 3.6vw, 3.6rem);
  line-height: 1.08;
  color: var(--nanode-blue);
  letter-spacing: -0.03em;
}

.hero-left p {
  max-width: 720px;
  font-size: 1.05rem;
  line-height: 1.75;
  margin: 0 0 18px;
  color: #4d5862;
}

.hero-left .primary-button {
  margin-top: 14px;
}

/* EVENT CARD */

.hero-right {
  width: 100%;
  min-width: 0;
}

.next-event {
  background-color: var(--light-blue);
  padding: 34px;
  border-radius: 14px;
  border-left: 5px solid var(--ku-red);
  margin: 0;
}

.section-label {
  margin: 0 0 10px;
  color: var(--ku-red);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.next-event h2 {
  margin: 0 0 14px;
  color: var(--nanode-blue);
  font-size: 1.8rem;
  line-height: 1.2;
}

.event-info {
  margin: 0 0 16px;
  font-weight: 600;
  color: var(--text-dark);
}

.event-image {
  display: block;
  width: 100%;
  max-height: 320px;
  object-fit: cover;
  border-radius: 14px;
  margin-bottom: 24px;
}

.next-event > p:not(.section-label):not(.event-info) {
  margin: 0 0 18px;
  color: #4d5862;
}

.text-link {
  color: var(--nanode-blue);
  text-decoration: none;
  font-weight: 700;
}

.text-link:hover {
  color: var(--ku-red);
}

/* BUTTON */

.primary-button {
  display: inline-block;
  padding: 14px 24px;
  background-color: var(--nanode-blue);
  color: var(--white);
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
  transition: 0.2s ease;
}

.primary-button:hover {
  background-color: var(--ku-red);
}

/* LINKEDIN */

.linkedin {
  padding: 0 0 70px;
  text-align: right;
}

.linkedin span {
  display: inline-block;
  margin-right: 12px;
  color: #5d6872;
  font-size: 0.95rem;
  font-weight: 600;
}

.linkedin a {
  display: inline-block;
  padding: 12px 18px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  box-shadow: 0 8px 22px rgba(23, 74, 126, 0.06);
  color: var(--nanode-blue);
  text-decoration: none;
  font-weight: 700;
}

.linkedin a:hover {
  color: var(--ku-red);
}

/* FOOTER */

footer {
  background-color: var(--nanode-blue);
  color: var(--white);
  padding: 35px 8%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer div:last-child {
  display: flex;
  gap: 24px;
}

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

footer a:hover {
  text-decoration: underline;
}

.footer-brand {
  display: grid;
  gap: var(--space-1);
}

.footer-brand strong {
  font-size: 1.15rem;
}

.footer-brand span,
.footer-links span {
  color: rgba(255, 255, 255, 0.76);
  font-size: 0.92rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

/* STANDARD PAGE INTRO */

.page-intro {
  max-width: 820px;
  margin: 55px 0 38px;
  padding: 30px 34px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  box-shadow: 0 10px 28px rgba(23, 74, 126, 0.06);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.page-intro h1 {
  margin: 0 0 16px;
  color: var(--nanode-blue);
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  line-height: 1.1;
}

.page-intro > p:last-child {
  max-width: 70ch;
  color: #4d5862;
  font-size: 1.08rem;
  line-height: 1.7;
}


/* EVENTS PAGE */

.events-list {
  display: grid;
  gap: 24px;
  margin-bottom: 70px;
}

.event-card {
  background-color: var(--surface);
  border: 1px solid #e3e8ed;
  border-left: 5px solid var(--nanode-blue);
  border-radius: 12px;
  padding: 30px;
}

.event-card h2 {
  margin: 0 0 8px;
  color: var(--nanode-blue);
  font-size: 1.6rem;
}

.event-card-info {
  margin: 0 0 16px;
  font-weight: 700;
  color: var(--text-dark);
}

.event-card > p:last-of-type {
  color: #4d5862;
}

.event-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin-top: 20px;
}

.event-links a {
  color: var(--nanode-blue);
  text-decoration: none;
  font-weight: 700;
}

.event-links a:hover {
  color: var(--ku-red);
}

.past-events-section {
  padding-bottom: 70px;
}

.past-events-section > h2 {
  margin: 0 0 25px;
  color: var(--nanode-blue);
  font-size: 2rem;
}

.past-event {
  opacity: 1;
  border-left-color: var(--nanode-grey);
}

/* MEMBERSHIP PAGE */

.membership-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.membership-card {
  background-color: var(--surface);
  border: 1px solid #e3e8ed;
  border-radius: 12px;
  padding: 28px;
}

.membership-card h2 {
  margin: 0 0 14px;
  color: var(--nanode-blue);
  font-size: 1.4rem;
}

.membership-card p {
  margin: 0;
  color: #4d5862;
}

.membership-signup {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 30px;
  background-color: var(--light-blue);
  border-left: 5px solid var(--ku-red);
  border-radius: 12px;
  padding: 30px;
  margin-bottom: 70px;
}

.membership-signup h2 {
  margin: 0;
  color: var(--nanode-blue);
}

/* TABLET */

@media (max-width: 950px) {
  body {
    background-image: var(--page-background-tablet);
  }

  header {
    padding: 14px 5%;
  }

  nav {
    gap: 20px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 35px;
  }

  .hero-left {
    max-width: 760px;
  }

  .hero-right {
    max-width: 700px;
  }

  .linkedin {
    text-align: left;
  }
}

/* MOBILE */

@media (max-width: 750px) {
  body {
    background-image: var(--page-background-mobile);
    background-attachment: scroll;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 18px;
  }

  .logo img {
    width: 120px;
  }

  nav {
    flex-wrap: wrap;
    gap: 12px 18px;
  }

  nav a {
    font-size: 0.95rem;
  }

  main {
    width: 88%;
  }

  .page-intro {
    margin: 38px 0 30px;
    padding: 25px 24px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
    padding: 45px 0 50px;
  }

  .hero-left h1 {
    font-size: 2.35rem;
  }

  .hero-left {
    padding: 26px 24px;
  }

  .hero-left p {
    font-size: 1rem;
  }

  .next-event {
    padding: 26px;
  }

  .next-event h2 {
    font-size: 1.55rem;
  }

  .membership-grid {
    grid-template-columns: 1fr;
  }
  
  .membership-signup {
    flex-direction: column;
    align-items: flex-start;
  }

  .linkedin {
    text-align: left;
    padding-bottom: 55px;
  }

  footer {
    flex-direction: column;
    align-items: center;
    gap: 20px;
    text-align: center;
  }

  .footer-brand,
  .footer-links {
    width: 100%;
    align-items: center;
    text-align: center;
  }

  footer div:last-child {
    flex-direction: column;
    gap: 8px;
  }
}


/* ABOUT AND CONTACT PAGES */

nav a[aria-current="page"] {
  color: var(--ku-red);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 50px;
}

.content-card {
  background-color: var(--surface);
  border: 1px solid #e3e8ed;
  border-top: 5px solid var(--nanode-blue);
  border-radius: 12px;
  padding: 28px;
}

.content-card h2,
.contact-panel h2,
.page-callout h2 {
  margin: 0 0 12px;
  color: var(--nanode-blue);
}

.content-card p,
.contact-panel p,
.page-callout p {
  margin: 0;
  color: #4d5862;
}

.page-callout,
.contact-panel {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  background-color: var(--light-blue);
  border-left: 5px solid var(--ku-red);
  border-radius: 12px;
  padding: 32px;
  margin-bottom: 70px;
}

.page-callout .section-label,
.contact-panel .section-label {
  margin-bottom: 8px;
}

.contact-panel {
  align-items: flex-start;
}

.contact-panel > div:first-child {
  max-width: 650px;
}

.contact-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  flex-shrink: 0;
}

.social-coming-soon {
  color: #5d6872;
  font-size: 0.95rem;
  font-weight: 600;
}

.privacy-content {
  max-width: 820px;
  margin-bottom: var(--space-8);
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
}

.privacy-content h2 {
  margin: var(--space-4) 0 var(--space-1);
  color: var(--nanode-blue);
  font-size: 1.35rem;
}

.privacy-content p {
  max-width: 72ch;
  margin: 0 0 var(--space-2);
  color: #4d5862;
}

.privacy-content a {
  color: var(--nanode-blue);
  font-weight: 700;
}

.privacy-updated {
  margin-top: var(--space-4);
  font-style: italic;
}

@media (max-width: 750px) {
  .privacy-content {
    padding: var(--space-3);
  }
}

@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
  }

  .page-callout,
  .contact-panel {
    align-items: flex-start;
    flex-direction: column;
    gap: 24px;
  }
}


/* ABOUT PAGE SECTIONS */

.about-sections {
  display: grid;
  gap: 20px;
  margin-bottom: 70px;
}

.about-section {
  display: block;
  background-color: var(--surface);
  border: 1px solid #e3e8ed;
  border-left: 5px solid var(--nanode-blue);
  border-radius: 12px;
  padding: 30px;
}

.about-section .section-label {
  margin: 5px 0 0;
}

.about-section h2 {
  margin: 0 0 10px;
  color: var(--nanode-blue);
  font-size: 1.55rem;
}

.about-section p:last-child {
  max-width: 760px;
  margin: 0;
  color: #4d5862;
}

@media (max-width: 600px) {
  .about-section {
    padding: 24px;
  }

  .about-section .section-label {
    margin: 0;
  }
}


/* BOARD */

.about-section {
  display: block;
}

.board-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.board-card {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: var(--space-2);
  align-items: start;
  min-height: 152px;
  padding: var(--space-3);
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.board-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 38px rgba(23, 74, 126, 0.13);
}

.board-avatar {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  background: var(--nanode-blue);
  border-radius: 50%;
  color: var(--white);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.board-card-content {
  min-width: 0;
}

.board-card h3 {
  margin: 0 0 var(--space-1);
  color: var(--nanode-blue);
  font-size: 1.1rem;
  line-height: 1.35;
}

.board-card .board-role {
  display: inline-block;
  margin: 0 0 var(--space-2);
  padding: 4px 10px;
  background: rgba(169, 96, 82, 0.10);
  border-radius: 999px;
  color: var(--ku-red);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.board-card .board-description {
  margin: 0;
  color: #5d6872;
  font-size: 0.95rem;
  line-height: 1.5;
}

.board-card .text-link {
  display: inline-block;
  margin-top: 14px;
}

@media (max-width: 850px) {
  .board-grid {
    grid-template-columns: 1fr;
  }
}

/* CONSISTENT CARD SYSTEM */

.hero-left,
.page-intro,
.event-card,
.membership-card,
.content-card,
.about-section,
.board-card {
  background: var(--surface);
  border-color: var(--surface-border);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
}

.next-event,
.membership-signup,
.page-callout,
.contact-panel {
  background: var(--callout);
  border-left: 4px solid var(--ku-red);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
}

/* Event status: blue for upcoming, grey for past */
.event-card {
  border-left: 5px solid var(--nanode-blue);
}

.event-card.past-event {
  border-left-color: var(--nanode-grey);
}

.hero-left p,
.page-intro p,
.event-card p,
.membership-card p,
.content-card p,
.about-section p,
.next-event p,
.contact-panel p {
  max-width: 70ch;
}

.primary-button {
  min-height: 48px;
  padding: 12px var(--space-3);
  border-radius: var(--space-1);
}

.event-card,
.membership-card,
.content-card,
.about-section {
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.event-card:hover,
.membership-card:hover,
.content-card:hover,
.about-section:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(23, 74, 126, 0.12);
}

@media (prefers-reduced-motion: reduce) {
  .board-card,
  .event-card,
  .membership-card,
  .content-card,
  .about-section {
    transition: none;
  }
}

@media (max-width: 550px) {
  .board-grid {
    grid-template-columns: 1fr;
  }
}


/* SIGNUP PAGE */

.signup-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.45fr);
  gap: var(--space-4);
  align-items: start;
  margin-bottom: var(--space-8);
}

.signup-form,
.signup-summary {
  padding: var(--space-5);
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
}

.signup-form {
  display: grid;
  gap: var(--space-3);
}

.form-field {
  display: grid;
  gap: 6px;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.form-field label,
.form-field legend {
  color: var(--nanode-blue);
  font-weight: 700;
}

.form-field input[type="text"],
.form-field input[type="email"],
.form-field input[type="number"] {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid #b7c0c8;
  border-radius: 8px;
  background: var(--white);
  color: var(--text-dark);
  font: inherit;
}

.form-field input:focus {
  outline: 3px solid rgba(23, 74, 126, 0.18);
  border-color: var(--nanode-blue);
}

.radio-options {
  display: grid;
  gap: 10px;
  margin-top: 4px;
}

.radio-options label {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--text-dark);
  font-weight: 500;
}

.radio-options input {
  width: 18px;
  height: 18px;
}

.field-hint,
.field-error,
.privacy-note,
.form-status {
  margin: 0;
  font-size: 0.92rem;
}

.field-hint,
.privacy-note {
  color: #5d6872;
}

.field-error,
.form-status-error {
  color: #9a3028;
}

.form-status-success {
  color: #226238;
}

.privacy-note a {
  color: var(--nanode-blue);
  font-weight: 700;
}

.form-submit {
  justify-self: start;
  border: 0;
  cursor: pointer;
  font: inherit;
}

.form-submit:disabled {
  cursor: wait;
  opacity: 0.7;
}

.signup-summary {
  border-top: 5px solid var(--nanode-blue);
}

.signup-summary h2 {
  margin: 0 0 var(--space-2);
  color: var(--nanode-blue);
}

.signup-summary ol {
  display: grid;
  gap: 12px;
  margin: 0;
  padding-left: 22px;
  color: #4d5862;
}

.honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

@media (max-width: 850px) {
  .signup-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .signup-form,
  .signup-summary {
    padding: var(--space-3);
  }

  .form-submit {
    width: 100%;
  }
}