/* ===== CALENDAR SECTION ===== */
.calendar-section {
  position: relative;
  padding: 6rem 0 7rem;
  background: linear-gradient(180deg, #09090b 0%, #060d12 50%, #09090b 100%);
  overflow: hidden;
}

/* Radial ambient glow behind the atom */
.calendar-section::before {
  content: '';
  position: absolute;
  top: 28%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(16,185,129,0.05) 0%, transparent 70%);
  pointer-events: none;
  animation: ambientPulse 6s ease-in-out infinite;
}

@keyframes ambientPulse {
  0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
  50%       { opacity: 1;   transform: translate(-50%, -50%) scale(1.1); }
}

/* ── Background ghost atoms (corners) ── */
.cal-bg-atom {
  position: absolute;
  top: 50%;
  right: -180px;
  transform: translateY(-50%);
  width: 520px;
  height: 520px;
  pointer-events: none;
  opacity: 0.5;
}

.cal-nucleus {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: radial-gradient(circle, #34d399, #10b981);
  box-shadow: 0 0 24px rgba(52,211,153,0.15), 0 0 60px rgba(52,211,153,0.06);
  animation: nucleusPulse 3s ease-in-out infinite;
}

@keyframes nucleusPulse {
  0%, 100% { box-shadow: 0 0 24px rgba(52,211,153,0.15), 0 0 60px rgba(52,211,153,0.06); }
  50%       { box-shadow: 0 0 36px rgba(52,211,153,0.25), 0 0 90px rgba(52,211,153,0.1);  }
}

.cal-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
}

.cal-orbit-1 {
  width: 320px; height: 130px;
  margin-left: -160px; margin-top: -65px;
  border: 1.5px solid rgba(16,185,129,0.12);
  animation: orbitSpin1 9s linear infinite;
}
.cal-orbit-2 {
  width: 320px; height: 130px;
  margin-left: -160px; margin-top: -65px;
  border: 1.5px solid rgba(59,130,246,0.10);
  animation: orbitSpin2 13s linear infinite;
}
.cal-orbit-3 {
  width: 320px; height: 130px;
  margin-left: -160px; margin-top: -65px;
  border: 1.5px solid rgba(52,211,153,0.08);
  animation: orbitSpin3 11s linear infinite;
}

.cal-electron {
  position: absolute;
  width: 7px; height: 7px;
  border-radius: 50%;
  top: -3.5px;
  left: calc(50% - 3.5px);
}
.cal-orbit-1 .cal-electron { background: #34d399; box-shadow: 0 0 8px rgba(52,211,153,0.5); }
.cal-orbit-2 .cal-electron { background: #60a5fa; box-shadow: 0 0 8px rgba(96,165,250,0.5); }
.cal-orbit-3 .cal-electron { background: #a7f3d0; box-shadow: 0 0 8px rgba(167,243,208,0.4); }

@keyframes orbitSpin1 { from { transform: rotate(0deg);   } to { transform: rotate(360deg);  } }
@keyframes orbitSpin2 { from { transform: rotate(60deg);  } to { transform: rotate(420deg);  } }
@keyframes orbitSpin3 { from { transform: rotate(-60deg); } to { transform: rotate(300deg);  } }

.cal-bg-atom-2 {
  position: absolute;
  top: 10%; left: -120px;
  width: 280px; height: 280px;
  pointer-events: none;
  opacity: 0.4;
}
.cal-bg-atom-2 .cal-nucleus { width: 10px; height: 10px; }
.cal-bg-atom-2 .cal-orbit-1 { width: 180px; height: 70px; margin-left: -90px; margin-top: -35px; animation-duration: 7s; }
.cal-bg-atom-2 .cal-orbit-2 { width: 180px; height: 70px; margin-left: -90px; margin-top: -35px; animation-duration: 11s; }
.cal-bg-atom-2 .cal-orbit-3 { width: 180px; height: 70px; margin-left: -90px; margin-top: -35px; animation-duration: 9s; }
.cal-bg-atom-2 .cal-electron { width: 5px; height: 5px; top: -2.5px; left: calc(50% - 2.5px); }

/* ── Container ── */
.calendar-section .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 2;
}

/* ── Header ── */
.calendar-header {
  text-align: center;
  margin-bottom: 2rem;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.calendar-header.visible { opacity: 1; transform: translateY(0); }

.cal-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16,185,129,0.08);
  border: 1px solid rgba(16,185,129,0.22);
  color: #34d399;
  padding: 0.35rem 1rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.cal-badge-atom { width: 26px; height: 26px; flex-shrink: 0; }

.calendar-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 600;
  color: #f4f4f5;
  margin-bottom: 0.5rem;
  line-height: 1.2;
}
.calendar-title .cal-gradient {
  background: linear-gradient(135deg, #10b981, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.calendar-subtitle { color: #52525b; font-size: 0.95rem; }

/* ── Hero Atom (SVG) ── */
.cal-atom-hero-wrap {
  display: flex;
  justify-content: center;
  margin: 1.6rem 0 1.2rem;
  opacity: 0;
  transform: translateY(20px) scale(0.92);
  transition: opacity 0.8s ease 0.1s, transform 0.8s cubic-bezier(0.34,1.56,0.64,1) 0.1s;
}
.cal-atom-hero-wrap.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.cal-atom-svg {
  width: 72px;
  height: 72px;
  animation: atomFloat 5s ease-in-out infinite;
  filter: drop-shadow(0 0 18px rgba(52,211,153,0.18));
}

@keyframes atomFloat {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-8px); }
}

/* ── Legend ── */
.calendar-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.5rem;
  margin-bottom: 3rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease 0.2s, transform 0.7s ease 0.2s;
}
.calendar-legend.visible { opacity: 1; transform: translateY(0); }

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: #a1a1aa;
}
.legend-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.legend-dot.ld-first-last { background: #f59e0b; box-shadow: 0 0 6px rgba(245,158,11,0.5); }
.legend-dot.ld-holiday    { background: #f43f5e; box-shadow: 0 0 6px rgba(244,63,94,0.5);  }
.legend-dot.ld-g12        { background: #10b981; box-shadow: 0 0 6px rgba(16,185,129,0.5); }
.legend-dot.ld-summer     { background: #0ea5e9; box-shadow: 0 0 6px rgba(14,165,233,0.5); }
.legend-dot.ld-g12-last   { background: #a855f7; box-shadow: 0 0 6px rgba(168,85,247,0.5); }

/* ── Month grid ── */
.calendar-months-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

/* ── Month card ── */
.cal-month-card {
  position: relative;
  overflow: hidden;
  background: rgba(255,255,255,0.022);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 14px;
  padding: 1rem 0.85rem 1.1rem;
  backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.22,1,0.36,1),
              border-color 0.3s, box-shadow 0.3s;
}
.cal-month-card.visible    { opacity: 1; transform: translateY(0); }
.cal-month-card:hover      { border-color: rgba(16,185,129,0.22); box-shadow: 0 10px 36px rgba(0,0,0,0.35), 0 0 0 1px rgba(16,185,129,0.08); }
.cal-month-card.visible:hover { transform: translateY(-4px); }

/* Shimmer sweep on hover */
.cal-month-card::after {
  content: '';
  position: absolute;
  top: 0; left: -110%;
  width: 60%; height: 100%;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.04) 50%, transparent 60%);
  transition: left 0.55s ease;
  border-radius: 14px;
  pointer-events: none;
}
.cal-month-card:hover::after { left: 150%; }

/* ── Month header ── */
.cal-month-header {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 600;
  color: #d4d4d8;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.65rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

/* ── Day grid ── */
.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
}
.cal-day-header {
  text-align: center;
  font-size: 0.58rem;
  font-weight: 600;
  color: #3f3f46;
  padding: 0.2rem 0;
  text-transform: uppercase;
}
.cal-day {
  text-align: center;
  font-size: 0.67rem;
  font-weight: 400;
  color: #52525b;
  padding: 0.22rem 0;
  border-radius: 4px;
  cursor: default;
  transition: background 0.15s, color 0.15s, transform 0.1s;
  position: relative;
  line-height: 1.4;
}
.cal-day:not(.empty):hover { transform: scale(1.15); }
.cal-day.empty { color: transparent; pointer-events: none; }

/* Special dates */
.cal-day.holiday       { background: rgba(244,63,94,0.14);   color: #fb7185; font-weight: 500; }
.cal-day.g12-intensive { background: rgba(16,185,129,0.16);  color: #34d399; font-weight: 500; }
.cal-day.summer-online { background: rgba(14,165,233,0.13);  color: #38bdf8; font-weight: 500; }

.cal-day.first-last-day {
  background: rgba(245,158,11,0.2);
  color: #fbbf24;
  font-weight: 700;
  border-radius: 50%;
  animation: glowAmber 2.5s ease-in-out infinite;
}
.cal-day.last-day-g12 {
  background: rgba(168,85,247,0.2);
  color: #c084fc;
  font-weight: 700;
  border-radius: 50%;
  animation: glowPurple 3s ease-in-out infinite;
}

@keyframes glowAmber {
  0%, 100% { box-shadow: 0 0 0 1px rgba(245,158,11,0.3); }
  50%       { box-shadow: 0 0 8px rgba(245,158,11,0.55), 0 0 0 1.5px rgba(245,158,11,0.5); }
}
@keyframes glowPurple {
  0%, 100% { box-shadow: 0 0 0 1px rgba(168,85,247,0.3); }
  50%       { box-shadow: 0 0 8px rgba(168,85,247,0.5),  0 0 0 1.5px rgba(168,85,247,0.45); }
}

/* Tooltip — positioned via JS to avoid edge clipping */
.cal-day[data-tooltip] { cursor: pointer; }

#cal-tooltip-box {
  position: fixed;
  background: rgba(12,12,18,0.97);
  color: #e4e4e7;
  font-size: 0.63rem;
  font-weight: 500;
  white-space: nowrap;
  padding: 0.28rem 0.55rem;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.08);
  pointer-events: none;
  z-index: 9999;
  display: none;
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .calendar-months-grid { grid-template-columns: repeat(3, 1fr); }
  .cal-bg-atom { right: -240px; }
}

/* Tablet */
@media (max-width: 768px) {
  .calendar-months-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
  .cal-bg-atom, .cal-bg-atom-2 { display: none; }
  .calendar-section { padding: 4rem 0 5rem; }
  .calendar-legend { gap: 0.5rem 1.25rem; }
}

/* Large phone — 2 columns */
@media (max-width: 600px) {
  .calendar-section .container { padding: 0 1rem; }
  .cal-month-card { padding: 0.9rem 0.7rem 1rem; }
  .cal-month-header { font-size: 0.72rem; margin-bottom: 0.5rem; }
  .cal-day { font-size: 0.74rem; padding: 0.3rem 0; }
  .cal-day-header { font-size: 0.6rem; }
  .legend-item { font-size: 0.75rem; }
  .cal-badge { font-size: 0.72rem; padding: 0.3rem 0.85rem; }
  .calendar-title { font-size: clamp(1.4rem, 6vw, 2rem); }
  .calendar-subtitle { font-size: 0.85rem; }
}

/* Small phone — 1 column, larger tap targets */
@media (max-width: 480px) {
  .calendar-months-grid { grid-template-columns: 1fr; gap: 0.65rem; }
  .cal-month-card { padding: 1rem 0.9rem 1.1rem; }
  .cal-month-header { font-size: 0.76rem; }
  .cal-grid { gap: 2px; }
  .cal-day {
    font-size: 0.82rem;
    padding: 0.42rem 0;
    min-height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .cal-day-header { font-size: 0.65rem; padding: 0.25rem 0; }
  .calendar-legend { flex-direction: column; align-items: flex-start; gap: 0.45rem; padding: 0 0.25rem; }
  .legend-item { font-size: 0.8rem; }
  .cal-badge { font-size: 0.73rem; }
  .calendar-header { margin-bottom: 1.5rem; }
}

/* Extra small phone (SE, older Android) */
@media (max-width: 360px) {
  .calendar-section .container { padding: 0 0.75rem; }
  .cal-day { font-size: 0.77rem; min-height: 26px; }
  .cal-month-card { padding: 0.85rem 0.7rem 1rem; }
}