@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=Inter:wght@300..700&display=swap');

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

:root {
  --green:        #a72323;
  --green-dark:   #e01b24;
  --green-light:  #e01b24;
  --green-pale:   #deddda;
  --navy:         #1e2535;
  --navy-2:       #2a3245;
  --text:         #1a1a2e;
  --text-muted:   #5a5f72;
  --text-faint:   #9da3b4;
  --bg:           #f8f9fb;
  --surface:      #ffffff;
  --surface-2:    #f2f5f8;
  --border:       rgba(30,37,53,0.1);
  --radius-sm:    0.375rem;
  --radius-md:    0.5rem;
  --radius-lg:    0.75rem;
  --radius-xl:    1rem;
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.08);
  --shadow-lg:    0 12px 32px rgba(0,0,0,0.1), 0 4px 8px rgba(0,0,0,0.05);
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'Inter', 'Helvetica Neue', sans-serif;
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.35vw, 2.5rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --space-2: 0.5rem;  --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem;  --space-8: 2rem;
  --space-10: 2.5rem; --space-12: 3rem;   --space-16: 4rem;
}

.page-goose-watermark {
  position: fixed;        
  bottom: 05px;          
  right: 05px;
  width: clamp(140px, 25vw, 520px);  
  height: auto;
  opacity: 0.2;         
  pointer-events: none;   
  user-select: none;
  z-index: 0;
  mix-blend-mode: multiply;  
  filter: grayscale(1%);    
}

.page-goemmi-watermark {
  position: fixed;
  top: 65vh;
  left: -5px;
  transform: translateY(-50%);  
  width: clamp(50px, 12vw, 200px);
  height: auto;
  opacity: 0.15;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  mix-blend-mode: multiply;
  filter: grayscale(1%);
}

/* keeps all page content above the watermark layer */
header, nav, main, section, footer { position: relative; z-index: 1; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body { font-family: var(--font-body); font-size: var(--text-base); color: var(--text); background: var(--bg); line-height: 1.6; min-height: 100dvh; }
img, video { display: block; max-width: 100%; height: auto; }
a { color: var(--green); transition: color 0.18s ease; }
a:hover { color: var(--green-dark); }
:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; border-radius: var(--radius-sm); }

/* ── SKIP LINK ── */
.skip-link { position: absolute; top: -100%; left: var(--space-4); background: var(--navy); color: #fff; padding: var(--space-2) var(--space-4); border-radius: 0 0 var(--radius-md) var(--radius-md); font-size: var(--text-sm); font-weight: 600; z-index: 200; }
.skip-link:focus { top: 0; }

/* ── HEADER ── */
header {
  background: var(--navy);
  color: #fff;
  padding: var(--space-6) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* .header-inner wraps logo + text */
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  flex: 1;
  min-width: 0;
}

/* Logo */
.header-logo-link { flex-shrink: 0; display: block; }
.header-logo-img {
  height: clamp(80px, 15vw, 300px);
  width: auto;
  display: block;
  border-radius: var(--radius-md);
  mix-blend-mode: screen;
}

/* Text block — .header-text is the new name, .header-left kept for backward compat */
.header-text,
.header-left {
  min-width: 0;
  flex: 1;
}
.header-text h1,
.header-left h1 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: #fff;
  line-height: 1.15;
  margin-bottom: var(--space-2);
}
.header-text h2,
.header-left h2 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--green-light);
  font-weight: 400;
  margin-bottom: var(--space-2);
}
.header-text p,
.header-left p {
  font-size: var(--text-sm);
  color: rgba(255,255,255,0.6);
}

/* Apply button in header */
.header-apply-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--green);
  color: #fff !important;
  text-decoration: none;
  padding: 0.7rem 1.4rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: var(--text-sm);
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.18s ease, transform 0.15s ease, box-shadow 0.18s ease;
  box-shadow: 0 2px 8px rgba(224, 27, 36, 0.4);
}
.header-apply-btn:hover,
.header-apply-btn:focus { background: var(--green-dark); transform: translateY(-1px); box-shadow: 0 4px 16px rgba(224, 27, 36, 0.4); }

/* ── NAV ── */
nav {
  background: var(--navy-2);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-8);
  padding: 0.85rem var(--space-8);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}
nav a { color: rgba(255,255,255,0.78); text-decoration: none; font-weight: 500; font-size: var(--text-sm); padding: 0.3em 0; position: relative; transition: color 0.2s ease; }
nav a::after { content: ""; display: block; height: 2px; width: 0%; background: var(--green-light); position: absolute; left: 0; bottom: -4px; transition: width 0.22s cubic-bezier(.12,.74,.58,1.03); border-radius: 2px; }
nav a:hover, nav a:focus { color: #fff; outline: none; }
nav a:hover::after, nav a:focus::after { width: 100%; }
nav a.active, nav a[aria-current="page"] { color: var(--green-light); font-weight: 600; }
nav a.active::after, nav a[aria-current="page"]::after { width: 100%; }

/* ── COUNTDOWN HERO BAND ── */
.hero-band {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #fff;
  padding: var(--space-10) var(--space-8);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero-goose {
  position: absolute;
  right: -4%;
  bottom: -8%;
  width: 48%;
  max-width: 500px;
  opacity: 0.15;
  mix-blend-mode: screen;
  pointer-events: none;
  user-select: none;
  transform: rotate(-5deg);
}
.hero-band-content { position: relative; z-index: 1; }
.hero-band h2 { font-family: var(--font-display); font-size: var(--text-xl); color: #ffffff; margin-bottom: var(--space-8); }
.countdown-grid { display: flex; flex-wrap: wrap; gap: var(--space-8); justify-content: center; }
.countdown-box { background: rgba(255,255,255,0.07); border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius-xl); padding: var(--space-6) var(--space-8); min-width: 340px; max-width: 420px; flex: 1; }
.countdown-box-title { font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: rgba(255,255,255,0.5); margin-bottom: var(--space-4); }
.countdown-digits { display: flex; gap: var(--space-3); justify-content: center; align-items: flex-end; flex-wrap: nowrap; min-height: 4rem; }
.countdown-unit { display: flex; flex-direction: column; align-items: center; gap: 0.2rem; }
.countdown-num { font-family: var(--font-display); font-size: clamp(2.2rem, 5vw, 3.2rem); line-height: 1; color: #fff; min-width: 2.4ch; text-align: center; }
.countdown-label { font-size: var(--text-xs); color: rgba(255,255,255,0.4); text-transform: uppercase; letter-spacing: 0.07em; }
.countdown-sep { font-size: 2rem; color: rgba(255,255,255,0.2); padding-bottom: 0.3rem; align-self: center; }
.countdown-status { margin-top: var(--space-4); font-size: var(--text-sm); color: #ffffff; font-weight: 600; }

/* ── APPLY CTA BAND ── */
.apply-cta-band { background: var(--green-pale); border-top: 3px solid var(--green-light); padding: var(--space-10) var(--space-8); text-align: center; }
.apply-cta-band h3 { font-family: var(--font-display); font-size: var(--text-lg); color: var(--navy); margin-bottom: var(--space-3); }
.apply-cta-band p { font-size: var(--text-sm); color: var(--text-muted); margin-bottom: var(--space-6); max-width: 52ch; margin-inline: auto; }
.btn-apply { display: inline-flex; align-items: center; gap: var(--space-2); background: var(--green); color: #fff !important; text-decoration: none; padding: 0.85rem 2rem; border-radius: 9999px; font-weight: 700; font-size: var(--text-base); transition: background 0.18s ease, transform 0.15s ease, box-shadow 0.18s ease; box-shadow: 0 4px 16px rgba(90,150,50,0.35); }
.btn-apply:hover, .btn-apply:focus { background: var(--green-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(90,150,50,0.45); }

/* ── MAIN CONTAINER ── */
.container { max-width: 900px; margin: var(--space-10) auto; padding: var(--space-4) var(--space-4); background: rgba(255, 255, 255, 0); box-shadow: var(--shadow-md); border-radius: var(--radius-xl); }
.container p, .container li { font-size: var(--text-base); line-height: 1.8; max-width: 72ch; }
.container ul { padding-left: var(--space-6); }
.container ul li { margin-bottom: var(--space-2); }
h1 { font-family: var(--font-display); font-size: var(--text-xl); color: var(--navy); margin-bottom: var(--space-4); }
h2 { font-family: var(--font-display); font-size: var(--text-lg); color: var(--navy); margin: var(--space-8) 0 var(--space-3); }

/* ── FOOTER ── */
.footer { background: var(--navy); color: rgba(255,255,255,0.5); text-align: center; padding: var(--space-8); font-size: var(--text-xs); margin-top: var(--space-12); }
.footer a { color: var(--green-light); }

/* ── TABLE ── */
table { width: 100%; border-collapse: collapse; margin-top: var(--space-4); }
th, td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); text-align: left; font-size: var(--text-sm); }
th { background: var(--navy); color: #fff; font-weight: 600; }
tr:hover td { background: var(--green-pale); }

/* ── FAQ ── */
details { background: rgba(255, 255, 255, 0); border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: var(--space-3); overflow: hidden; }
details[open] { border-color: var(--green); box-shadow: 0 4px 12px rgba(90,150,50,0.1); }
summary { font-weight: 600; font-size: var(--text-base); padding: var(--space-4) var(--space-6); cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; color: var(--navy); }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--green); font-size: 1.4rem; font-weight: 400; }
details[open] summary::after { content: "−"; }
.faq-content { padding: var(--space-4) var(--space-6); border-top: 1px solid var(--border); font-size: var(--text-sm); color: var(--text-muted); line-height: 1.75; }
.faq-content a { color: var(--green); }
.faq-section-title { font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-faint); margin: var(--space-8) 0 var(--space-3); border-bottom: 1px solid var(--border); padding-bottom: var(--space-2); }

/* ── SPEAKERS / ORGANIZERS ── */
.speakers-page { max-width: 900px; }
.speakers-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(280px,100%),1fr)); gap: var(--space-4); margin-top: var(--space-4); }
.speaker-card { background: rgba(255, 255, 255, 0); border: 5px solid var(--border); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-sm); transition: transform 0.22s ease, box-shadow 0.22s ease; display: flex; flex-direction: column; }
.speaker-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.speaker-photo { width: 100%; aspect-ratio: 1/1; object-fit: cover; background: var(--surface-2); }
.speaker-content { padding: var(--space-4) var(--space-4) var(--space-6); display: flex; flex-direction: column; gap: var(--space-2); flex-grow: 1; }
.speaker-content h2 { font-size: var(--text-base); color: var(--navy); margin: 0; }
.speaker-role { font-size: var(--text-xs); font-weight: 600; color: var(--text-muted); }
.speaker-topic { font-size: var(--text-xs); color: var(--text-faint); }
.speaker-links { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: auto; padding-top: var(--space-3); }
.speaker-links a { text-decoration: none; color: var(--green); border: 1px solid var(--green); padding: 0.3rem 0.75rem; border-radius: 9999px; font-size: var(--text-xs); font-weight: 600; transition: all 0.18s ease; }
.speaker-links a:hover { background: var(--green); color: #fff; }
.speaker-bio {background: rgba(255, 255, 255, 0); margin-top: var(--space-2); border: 3px solid var(--border); padding-top: var(--space-2); }
.speaker-bio summary { list-style: none; cursor: pointer; color: var(--green); font-weight: 600; font-size: var(--text-xs); display: flex; align-items: center; justify-content: center; padding: var(--space-2); }
.speaker-bio summary::-webkit-details-marker { display: none; }
.speaker-bio summary::after { display: none; } /* override global + sign for speaker bios */
.speaker-bio summary::before { content: '▶'; display: inline-block; margin-right: 6px; font-size: 0.7rem; transition: transform 0.2s ease; }
.speaker-bio[open] summary::before { transform: rotate(90deg); }
.bio-text { margin-top: var(--space-3); font-size: var(--text-xs); line-height: 1.6; color: var(--text-muted); animation: slideDown 0.25s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: translateY(0); } }

/* schedule-page*/

.schedule-container { max-width: 1100px; }

.schedule-intro {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin-bottom: var(--space-6);
  max-width: 70ch;
}

/* ── LEGEND ── */
.schedule-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.legend-item {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  letter-spacing: 0.03em;
}
.legend-lecture   { background: #dbeafe; color: #1e40af; }
.legend-tutorial  { background: #d1fae5; color: #065f46; }
.legend-hackathon { background: #ede9fe; color: #5b21b6; }
.legend-social    { background: var(--green-pale); color: var(--green-dark); }
.legend-special   { background: #fef3c7; color: #92400e; }

/* ── WEEK TABS ── */
.week-tabs {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  border-bottom: 2px solid var(--border);
}
.week-tab {
  background: none;
  border: none;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.week-tab:hover { color: var(--navy); background: var(--green-pale); }
.week-tab.active { color: var(--navy); border-bottom-color: var(--green); }
.week-tab:focus-visible { outline: 2px solid var(--green); outline-offset: 2px; }

/* ── PANELS ── */
.week-panel[hidden] { display: none; }
.week-heading {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--navy);
  margin-bottom: var(--space-5);
  margin-top: var(--space-2);
}

/* ── DESKTOP TABLE (>=900px) ── */
.schedule-mobile  { display: none; }
.schedule-desktop { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }

.sched-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-xs);
  min-width: 820px;
  table-layout: fixed;
}
.sched-table thead th {
  background: rgba(255, 255, 255, 0);
  color: #000;
  font-weight: 600;
  font-size: var(--text-xs);
  padding: 0.65rem 0.6rem;
  text-align: center;
  border-right: 1px solid rgba(255,255,255,0.1);
  line-height: 1.4;
}
.sched-table thead th:first-child { text-align: left; }
.col-date { font-size: 0.7rem; font-weight: 400; opacity: 0.7; display: block; }
.sched-table tbody td {
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.45;
  font-size: var(--text-xs);
}
td.col-time {
  font-weight: 700;
  color: var(--text-muted);
  font-size: 0.7rem;
  white-space: nowrap;
  background: var(--surface-2);
  width: 68px;
}
.ev-lecture   { background: #eff6ff; color: #1e40af; }
.ev-tutorial  { background: #ecfdf5; color: #065f46; }
.ev-hackathon { background: #f5f3ff; color: #5b21b6; }
.ev-social    { background: var(--green-pale); color: var(--green-dark); font-size: 0.68rem; }
.ev-special   { background: #fffbeb; color: #92400e; }
.sched-table em { font-style: italic; opacity: 0.85; }
.two-col { font-size: 0.68rem; }

/* ── MOBILE CARDS (<900px) ── */
@media (max-width: 900px) {
  .schedule-desktop { display: none; }
  .schedule-mobile  { display: block; }
}
.day-card {
  background: rgba(255, 255, 255, 0);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.day-title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  color: #fff;
  background: var(--navy);
  padding: var(--space-3) var(--space-4);
  margin: 0;
}
.event-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  border-bottom: 1px solid var(--border);
  font-size: var(--text-xs);
}
.event-row:last-child { border-bottom: none; }
.event-time {
  font-weight: 700;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 5.5rem;
  flex-shrink: 0;
  font-size: 0.7rem;
}
.event-desc { flex: 1; line-height: 1.5; }
.event-lecture   { background: #eff6ff; }
.event-lecture   .event-desc { color: #1e40af; }
.event-tutorial  { background: #ecfdf5; }
.event-tutorial  .event-desc { color: #065f46; }
.event-hackathon { background: #f5f3ff; }
.event-hackathon .event-desc { color: #5b21b6; }
.event-social    { background: var(--green-pale); }
.event-social    .event-desc { color: var(--green-dark); }
.event-special   { background: #fffbeb; }
.event-special   .event-desc { color: #92400e; }

.dates-info-box {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 1.5rem auto 2rem;
  max-width: 640px;
}

.date-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 12px;
  padding: 1rem 2rem;
  min-width: 220px;
}

.date-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #aaa;
  margin-bottom: 0.4rem;
}

.date-value {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
}

.highlight-date {
  color: #ff8a65; /* warm accent — matches the color already used in script.js */
  background: rgba(255, 138, 101, 0.12);
  padding: 0.1em 0.45em;
  border-radius: 6px;
  white-space: nowrap;
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  header { flex-direction: column; align-items: flex-start; padding: var(--space-4); gap: var(--space-4); }
  .header-inner { gap: var(--space-3); }
  .header-logo-img { height: 60px; }
  .header-text h1, .header-left h1 { font-size: clamp(1rem, 4vw, 1.4rem); }
  .header-apply-btn { align-self: stretch; justify-content: center; }
  nav { flex-wrap: wrap; gap: var(--space-4); padding: var(--space-3) var(--space-4); }
  .container { margin: var(--space-4); padding: var(--space-6) var(--space-4); border-radius: var(--radius-lg); }
  .countdown-box { min-width: 100%; }
  .hero-band { padding: var(--space-8) var(--space-4); }
  .hero-goose { width: 70%; right: -5%; bottom: -5%; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}