/* =========================================================
   SCIENCE SOCIETY HANDBOOK — STYLE SYSTEM
   Academic / course-portal feel. No gradients, no glow,
   no oversized hero. Quiet grid, restrained accents.
   ========================================================= */

:root {
  /* Color — pulled directly from the Bloomfield Hall logo */
  --color-primary: #1b96a8;        /* teal ring / lettering */
  --color-primary-dark: #14707d;
  --color-secondary: #7ed048;      /* lime green ring / stars */
  --color-secondary-dark: #5da62f;
  --color-ink: #16181a;            /* near-black badge from the logo */
  --color-bg: #fafaf9;
  --color-surface: #ffffff;
  --color-text: #262626;
  --color-text-muted: #6b6b68;
  --color-border: #e2e1dd;
  --color-border-strong: #c9c8c3;

  /* Type */
  --font-heading: "IBM Plex Sans", "Inter", -apple-system, sans-serif;
  --font-body: "Inter", "IBM Plex Sans", -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", monospace;

  /* Layout */
  --container-w: 1080px;
  --radius: 6px;
  --nav-h: 64px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
  letter-spacing: -0.01em;
}

p { margin: 0; }

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

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

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

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Focus states (accessibility) ---------- */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}

/* =========================================================
   NAVIGATION
   ========================================================= */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.navbar .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
}

.nav-brand .brand-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  object-fit: contain;
}

.nav-brand span {
  font-size: 0.92rem;
}

.nav-links {
  display: flex;
  gap: 4px;
}

.nav-links a {
  padding: 8px 14px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius);
  transition: background 0.15s ease, color 0.15s ease;
}

.nav-links a:hover {
  color: var(--color-primary-dark);
  background: rgba(15, 110, 102, 0.07);
}

.nav-links a.active {
  color: var(--color-primary-dark);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 4px 0;
}

/* =========================================================
   PAGE HEADER (per-page eyebrow + title)
   ========================================================= */

.page-header {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--color-border);
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: 10px;
}

.page-header h1 {
  font-size: 2rem;
}

.page-header .sub {
  margin-top: 8px;
  color: var(--color-text-muted);
  font-size: 1rem;
}

/* =========================================================
   HOME — HEADER BLOCK
   ========================================================= */

.home-header {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--color-border);
}

.home-header .logo-row {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 24px;
}

.home-header .logo-row img,
.home-header .logo-row .brand-mark {
  width: 84px;
  height: 84px;
  object-fit: contain;
  flex-shrink: 0;
}

.home-header .logo-row .society-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
}

.home-header h1 {
  font-size: 2.25rem;
  margin-bottom: 8px;
}

.home-header .event-date {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* =========================================================
   SECTIONS
   ========================================================= */

section.block {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

section.block-first {
  padding-top: 60px;
}

section.block:last-of-type {
  border-bottom: none;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 1.3rem;
}

.section-heading .count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* =========================================================
   CARDS (generic)
   ========================================================= */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.card:hover {
  border-color: var(--color-border-strong);
}

/* ---------- Team grid ---------- */

.team-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.team-card {
  padding: 24px;
}

.team-card .team-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 6px;
  display: block;
}

.team-card h3 {
  font-size: 1.15rem;
  margin-bottom: 16px;
}

.team-card .team-hint {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

.member-list li {
  border-top: 1px solid var(--color-border);
}

.member-list li:first-child { border-top: none; }

.member-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 6px;
  margin: 0 -6px;
  font-size: 0.95rem;
  border-radius: var(--radius);
  transition: background 0.15s ease, color 0.15s ease;
}

.member-list a:hover {
  background: rgba(27, 150, 168, 0.08);
  color: var(--color-primary-dark);
}

.member-list a::before {
  content: "★";
  font-size: 0.7rem;
  line-height: 1;
  color: var(--color-secondary-dark);
  flex-shrink: 0;
}

.pair-number {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-muted);
  min-width: 16px;
}

/* ---------- Announcements ---------- */

.announcement-card {
  padding: 18px 20px;
  border-left: 3px solid var(--color-secondary);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.announcement-card:last-child { margin-bottom: 0; }

/* ---------- Quick links ---------- */

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Responsibilities ---------- */

.bullet-list li {
  position: relative;
  padding: 10px 0 10px 22px;
  border-top: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.bullet-list li:first-child { border-top: none; padding-top: 0; }

.bullet-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 600;
}

/* ---------- Duty schedule table ---------- */

.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.schedule-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  font-weight: 500;
  padding: 0 0 10px;
  border-bottom: 1px solid var(--color-border-strong);
}

.schedule-table td {
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
}

.schedule-table td:first-child {
  font-family: var(--font-mono);
  color: var(--color-primary-dark);
  white-space: nowrap;
  padding-right: 20px;
  width: 1%;
}

/* ---------- Experiment collapsible cards ---------- */

.experiment-card {
  margin-bottom: 12px;
  overflow: hidden;
}

.experiment-card:last-child { margin-bottom: 0; }

.experiment-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: var(--font-body);
}

.experiment-toggle .exp-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  flex-shrink: 0;
}

.experiment-toggle .exp-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1rem;
  flex-grow: 1;
}

.experiment-toggle .chevron {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  transition: transform 0.18s ease;
  color: var(--color-text-muted);
}

.experiment-card.open .chevron {
  transform: rotate(180deg);
}

.experiment-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.experiment-body-inner {
  padding: 0 20px 22px;
  border-top: 1px solid var(--color-border);
}

.experiment-body-inner .exp-desc {
  font-size: 0.95rem;
  color: var(--color-text);
  margin: 16px 0;
}

.exp-subhead {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin: 16px 0 8px;
}

.exp-subhead:first-of-type { margin-top: 0; }

.exp-materials li {
  font-size: 0.9rem;
  padding: 4px 0 4px 16px;
  position: relative;
}

.exp-materials li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-secondary);
}

.exp-notes {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.exp-actions {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

/* ---------- Preparation material / resource cards ---------- */

.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.resource-card {
  padding: 20px;
}

.resource-card h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.resource-card .desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.resource-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* ---------- General resources (simple links) ---------- */

.link-list li {
  border-top: 1px solid var(--color-border);
}

.link-list li:first-child { border-top: none; }

.link-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 4px;
  font-size: 0.95rem;
  color: var(--color-primary-dark);
  transition: color 0.15s ease;
}

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

.link-list a::before {
  content: "→";
  color: var(--color-secondary);
  font-weight: 600;
}

/* =========================================================
   BUTTONS
   ========================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  font-family: var(--font-body);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: 1px solid var(--color-primary);
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary-dark);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
  background: rgba(15, 110, 102, 0.06);
}

.btn-small {
  padding: 7px 14px;
  font-size: 0.8rem;
}

/* =========================================================
   FOOTER
   ========================================================= */

footer.site-footer {
  padding: 20px 0;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (max-width: 760px) {
  .nav-links {
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 8px;
    display: none;
  }

  .nav-links.open { display: flex; }

  .nav-toggle { display: block; }

  .team-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .home-header,
  .page-header {
    padding: 40px 0 28px;
  }

  .home-header h1 { font-size: 1.7rem; }
  .page-header h1 { font-size: 1.5rem; }

  section.block { padding: 36px 0; }
}
.guidelines-intro {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.guidelines-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.guideline-item {
  display: flex;
  gap: 16px;
}

.guideline-number {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-primary);
  flex-shrink: 0;
  padding-top: 2px;
}

.guideline-body h3 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.guideline-body p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

.guidelines-closing {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  font-style: italic;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}
.exp-explanation p {
  font-size: 0.92rem;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.65;
}

.exp-explanation p:last-child {
  margin-bottom: 0;
}
.exp-day-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-secondary-dark);
  margin: 32px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.exp-day-heading:first-child {
  margin-top: 0;
}
.page-header .pair-info {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--color-primary-dark);
  font-weight: 500;
}
/* =========================================================
   OPERATIONAL PAGE
   ========================================================= */

.op-flow p {
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.7;
}

.op-flow p:last-child {
  margin-bottom: 0;
}

.op-day-intro {
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 24px;
  line-height: 1.7;
}

.op-stations-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.op-station {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 18px 20px;
  background: var(--color-bg);
}

.op-station-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.op-station-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-primary);
  flex-shrink: 0;
}

.op-station-header h3 {
  font-size: 1rem;
  flex-grow: 1;
}

.op-station-note {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 100px;
  font-weight: 600;
}

.op-note-first {
  background: rgba(126, 208, 72, 0.15);
  color: var(--color-secondary-dark);
}

.op-note-station {
  background: rgba(27, 150, 168, 0.1);
  color: var(--color-primary-dark);
}

.op-note-last {
  background: rgba(22, 24, 26, 0.08);
  color: var(--color-ink);
}

@media (max-width: 760px) {
  .op-station {
    padding: 14px 16px;
  }
}
/* =========================================================
   LAYOUT GRID & LIGHTBOX
   ========================================================= */

.layout-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.layout-item {
  overflow: hidden;
  padding: 0;
  cursor: default;
}

.layout-img-wrap {
  width: 100%;
  display: block;
  background: var(--color-border);
  border: none;
  padding: 0;
  cursor: zoom-in;
  transition: opacity 0.15s ease;
}

.layout-img-wrap:hover {
  opacity: 0.92;
}

.layout-img-wrap img {
  width: 100%;
  height: auto;
  display: block;
}

.layout-info {
  padding: 16px 20px;
}

.layout-day-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 600;
}

.layout-desc {
  margin-top: 6px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ---------- Lightbox overlay ---------- */

.lightbox-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.88);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
  padding: 24px;
}

.lightbox-overlay.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-overlay.open .lightbox-img {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: background 0.15s ease;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.22);
}

.lightbox-close svg {
  width: 20px;
  height: 20px;
}

.lightbox-img {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius);
  transform: scale(0.92);
  transition: transform 0.3s ease;
}

@media (max-width: 760px) {
  .layout-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .lightbox-overlay {
    padding: 12px;
  }

  .lightbox-img {
    max-height: 85vh;
    border-radius: 4px;
  }

  .lightbox-close {
    top: 10px;
    right: 10px;
    width: 40px;
    height: 40px;
  }
}