/* ── Fonts ──────────────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=DM+Sans:wght@300;400;500&display=swap');

/* ── Variables — Cotton Candy Bliss palette ──────────────────────────────────── */
:root {
  --lavender:   #CDB4DB;
  --pink-lt:    #FFC8DD;
  --pink-md:    #FFAFCC;
  --sky-lt:     #BDE0FE;
  --sky-md:     #A2D2FF;

  --bg:         #fdf0f8;
  --paper:      #fffafd;
  --text-dk:    #4a3050;
  --text-md:    #7a5c8a;
  --shadow:     rgba(160, 100, 180, 0.10);

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'DM Sans', sans-serif;
  --radius: 6px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Reset & Base ────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  background-image:
    radial-gradient(ellipse at 20% 0%,   rgba(162,210,255,0.28) 0%, transparent 55%),
    radial-gradient(ellipse at 80% 100%, rgba(255,175,204,0.28) 0%, transparent 55%);
  color: var(--text-dk);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.hidden { display: none !important; }

/* ── Slideshow ───────────────────────────────────────────────────────────────── */
#slideshow-container {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.mySlides {
  display: none;
  width: 100%;
  height: 100%;
  animation: fadeSlide 1s ease;
}

.mySlides img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: brightness(0.52) saturate(0.75);
}

@keyframes fadeSlide { from { opacity: 0; } to { opacity: 1; } }

/* ── Login Screen ────────────────────────────────────────────────────────────── */
#login-screen {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  color: white;
}

#login-container {
  position: relative;
  z-index: 2;
  background: rgba(205, 180, 219, 0.22);
  backdrop-filter: blur(0px);
  -webkit-backdrop-filter: blur(0px);
  border: 1px solid rgba(239, 132, 173, 0.35);
  padding: 20px 20px;
  border-radius: 20px;
  text-align: center;
  max-width: 400px;
  width: 90%;
  box-shadow: 0 24px 64px rgba(160,100,180,0.25), 0 0 0 1px rgba(255,255,255,0.1) inset;
}

#login-container::before {
  display: block;
  font-size: 2.5rem;
  margin-bottom: 10px;
}

#login-container h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 400;
  font-style: italic;
  line-height: 1.55;
  margin-bottom: 28px;
  color: #fff;
  letter-spacing: 0.01em;
  text-shadow: 0 1px 6px rgba(100,60,120,0.3);
}

#login-container input {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid rgba(255,200,221,0.4);
  border-radius: 10px;
  background: rgba(255,255,255,0.12);
  color: white;
  font-family: var(--font-body);
  font-size: 1rem;
  text-align: center;
  letter-spacing: 0.15em;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}
#login-container input::placeholder { color: rgba(255,255,255,0.5); letter-spacing: 0.05em; }
#login-container input:focus {
  border-color: var(--pink-lt);
  background: rgba(255,255,255,0.18);
  box-shadow: 0 0 0 3px rgba(255,175,204,0.25);
}

#login-container button {
  width: 100%;
  margin-top: 14px;
  padding: 14px;
  background: linear-gradient(135deg, var(--pink-md), var(--lavender));
  border: none;
  border-radius: 10px;
  color: white;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
  box-shadow: 0 4px 20px rgba(255,175,204,0.4);
}
#login-container button:hover { opacity: 0.92; transform: translateY(-2px); }
#login-container button:active { transform: translateY(0); }

#error-message { color: #ffb3c6; margin-top: 12px; font-size: 0.9rem; min-height: 1.2em; }

@keyframes shake {
  0%,100% { transform: translateX(0); }
  25%      { transform: translateX(-8px); }
  75%      { transform: translateX(8px); }
}
.shake { animation: shake 0.4s ease; }

/* ── Gallery Wrapper ─────────────────────────────────────────────────────────── */
#gallery { flex: 1; padding-bottom: 60px; }

/* ── Gallery Hero ────────────────────────────────────────────────────────────── */
.gallery-hero {
  background: linear-gradient(135deg, #e8c8f0 0%, #ffc8dd 45%, #bde0fe 100%);
  color: var(--text-dk);
  padding: 52px 24px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.gallery-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 50%, rgba(162,210,255,0.4) 0%, transparent 50%),
    radial-gradient(circle at 85% 20%, rgba(205,180,219,0.4) 0%, transparent 45%);
  pointer-events: none;
}

.gallery-hero h1 {
  position: relative;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 5vw, 2.9rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.15;
  color: var(--text-dk);
  text-shadow: 0 1px 0 rgba(255,255,255,0.6);
}

.gallery-hero p {
  position: relative;
  margin-top: 10px;
  font-size: 0.9rem;
  color: var(--text-md);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.gallery-hero .hero-line {
  position: relative;
  width: 64px;
  height: 3px;
  background: linear-gradient(90deg, var(--pink-md), var(--sky-md));
  margin: 18px auto 0;
  border-radius: 2px;
}

/* ── Sticky Nav ──────────────────────────────────────────────────────────────── */
.semester-filter {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 250, 253, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--pink-lt);
  padding: 10px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(205,180,219,0.2);
}

.semester-filter button {
  padding: 7px 14px;
  border: 1px solid var(--lavender);
  background: rgba(255,255,255,0.7);
  color: var(--text-md);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
  border-radius: 20px;
  transition: all var(--transition);
  position: relative;
  white-space: nowrap;
}

.semester-filter button:hover {
  background: var(--pink-md);
  border-color: var(--pink-md);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255,175,204,0.4);
}

.nav-badge {
  display: inline-block;
  background: var(--sky-md);
  color: white;
  font-size: 0.65rem;
  padding: 1px 5px;
  border-radius: 10px;
  margin-left: 5px;
  vertical-align: middle;
  line-height: 1.4;
}

/* ── Sections ────────────────────────────────────────────────────────────────── */
#photo-gallery {
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px 20px;
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.semester-section {
  background: var(--paper);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 2px 32px var(--shadow);
  border: 1px solid rgba(205,180,219,0.25);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 32px 20px;
  border-bottom: 1px solid rgba(255,175,204,0.2);
  background: linear-gradient(90deg, rgba(189,224,254,0.18), rgba(255,200,221,0.12), transparent);
}

.semester-title {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-dk);
  letter-spacing: -0.01em;
}

.semester-title::before {
  content: "✦ ";
  color: var(--pink-md);
  font-size: 0.85em;
}

.photo-count {
  font-size: 0.78rem;
  color: var(--text-md);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: linear-gradient(135deg, rgba(162,210,255,0.2), rgba(255,175,204,0.2));
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid rgba(205,180,219,0.4);
}

/* ── Photo Grid ──────────────────────────────────────────────────────────────── */
.section-family .photo-grid {
  columns: 4 180px;
}

.photo-grid {
  columns: 5 180px;
  column-gap: 10px;
  padding: 20px;
}

.photo-item {
  break-inside: avoid;
  margin-bottom: 10px;
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
  background: #f0e6f8;
}

.photo-item img {
  width: 100%;
  display: block;
  transition: transform 0.45s cubic-bezier(0.4,0,0.2,1), filter 0.3s ease;
  filter: brightness(0.98) saturate(0.95);
}

.photo-item img.lazy   { opacity: 0; transition: opacity 0.4s ease; }
.photo-item img.loaded { opacity: 1; }

.photo-item:hover img {
  transform: scale(1.06);
  filter: brightness(1.03) saturate(1.08);
}

.photo-overlay {
  position: absolute;
  inset: 0;
    background: linear-gradient(to top, rgba(255, 255, 255, 0.28) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition);
}
.photo-item:hover .photo-overlay { opacity: 1; }

/* ── Lightbox ────────────────────────────────────────────────────────────────── */
#lightbox {
  position: fixed;
  inset: 0;
  background: rgba(60, 30, 75, 0.33);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  z-index: 9999;
  animation: lbIn 0.2s ease;
  backdrop-filter: blur(10px);
}

@keyframes lbIn { from { opacity: 0; } to { opacity: 1; } }

.close {
  position: absolute;
  top: 20px;
  right: 28px;
  font-size: 2rem;
  color: rgba(255,200,221,0.7);
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition), transform var(--transition);
  z-index: 2;
}
.close:hover { color: var(--pink-lt); transform: rotate(90deg); }

.lightbox-nav {
  background: rgba(205,180,219,0.12);
  border: 1px solid rgba(205,180,219,0.3);
  color: rgba(255,255,255,0.8);
  font-size: 1.8rem;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
  user-select: none;
}
.lightbox-nav:hover {
  background: var(--pink-md);
  border-color: var(--pink-md);
  color: white;
  box-shadow: 0 0 20px rgba(255,175,204,0.4);
}

.lightbox-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 82vw;
  gap: 14px;
}

#lightbox-img {
  max-width: 100%;
  max-height: 82vh;
  border-radius: 8px;
  object-fit: contain;
  box-shadow: 0 24px 80px rgba(219, 139, 248, 0.7);
  opacity: 0;
  transition: opacity 0.35s ease;
}
#lightbox-img.lb-ready { opacity: 1; }

#lightbox-text {
  color: rgba(250, 215, 229);
  font-size: 0.99rem;
  letter-spacing: 0.06em;
  font-family: var(--font-display);
  font-style: italic;
}

#lb-counter {
  color: rgba(255, 255, 255, 1);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

/* ── Music Button ────────────────────────────────────────────────────────────── */
#music-btn {
  position: fixed;
  bottom: 24px;
  left: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--lavender), var(--sky-md));
  color: white;
  font-size: 1.2rem;
  border: none;
  cursor: pointer;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(162,210,255,0.4);
}
#music-btn:hover { transform: scale(1.12); box-shadow: 0 6px 22px rgba(205,180,219,0.5); }

/* ── Footer ──────────────────────────────────────────────────────────────────── */
#footer {
  text-align: center;
  padding: 28px 20px;
  background: linear-gradient(135deg, #ffffff, #ffc8dd 50%, #ffffff);
  color: var(--text-md);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  line-height: 1.8;
  margin-top: auto;
}
#footer span { color: var(--text-dk); font-weight: 500; }

#visitor-counter {
  margin-top: 10px;
  font-size: 0.85rem;
  opacity: 0.75;
  color: #fff;
  letter-spacing: 0.05em;
}

/* ── Back to Top ─────────────────────────────────────────────────────────────── */
#back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pink-md), var(--sky-md));
  color: white;
  font-size: 1.3rem;
  border: none;
  cursor: pointer;
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(255,175,204,0.45);
  opacity: 0;
  transform: translateY(16px);
  transition: all var(--transition);
  pointer-events: none;
}
#back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
#back-to-top:hover   { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(162,210,255,0.5); }

/* ── Responsive ──────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .photo-grid           { columns: 2 140px; }
  .section-header       { padding: 18px 20px 14px; flex-wrap: wrap; gap: 8px; }
  .semester-title       { font-size: 1.2rem; }
  .lightbox-nav         { width: 40px; height: 40px; font-size: 1.2rem; }
  .lightbox-content     { max-width: 88vw; }
}

@media (max-width: 480px) {
  .photo-grid             { columns: 2 120px; }
  .semester-filter button { font-size: 0.72rem; padding: 6px 11px; }
}

/* ── Scroll reveal ───────────────────────────────────────────────────────────── */
.semester-section {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.semester-section.revealed {
  opacity: 1;
  transform: translateY(0);
}