/* =====================================================
   GLOBAL RESET
===================================================== */

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  min-height: 100%;
  font-family: "Nunito", system-ui, sans-serif;
  overflow-x: hidden;
  overflow-y: auto;
}

/* =====================================================
   APP CONTAINER (SPLIT SCREEN)
===================================================== */

.app {
  width: 100%;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 50% 50%;
}

/* =====================================================
   WHITE SIDE (LEFT)
===================================================== */

.white-area {
  background: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 40px 0;
}

.teacher-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.35s ease, filter 0.35s ease;
}

.teacher-wrap:hover {
  transform: scale(1.04);
  filter: brightness(1.05);
}

.teacher-img {
  width: 95%;
  max-width: 480px;
}

.tap-text {
  margin-top: 12px;
  font-size: 16px;
  font-weight: 700;
  color: #0a4f57;
}

/* =====================================================
   GREEN SIDE (RIGHT)
===================================================== */

.green-area {
  background: linear-gradient(180deg, #0f6f73, #0a4f57);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 40px 0;
}

/* =====================================================
   BIG LOGO
===================================================== */

.logo-wrap {
  margin-bottom: 28px;
  display: flex;
  justify-content: center;
}

.big-logo {
  width: 280px;
  max-width: 80vw;
  transition: transform 0.35s ease, filter 0.35s ease;
}

.big-logo:hover {
  transform: scale(1.06);
  filter: brightness(1.08);
}

/* =====================================================
   ACTION BUTTONS — 3D GLASS
===================================================== */

.actions {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: center;
}

.action-btn {
  min-width: 240px;
  padding: 18px 32px;
  border-radius: 999px;
  border: none;
  font-size: 17px;
  font-weight: 700;

  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.32),
    rgba(255, 255, 255, 0.08)
  );

  color: #ffffff;
  backdrop-filter: blur(16px);
  cursor: pointer;

  box-shadow:
    inset 0 2px 2px rgba(255,255,255,0.6),
    inset 0 -2px 2px rgba(0,0,0,0.1),
    0 12px 28px rgba(0,0,0,0.22);

  transition: all 0.35s cubic-bezier(.22,.61,.36,1);
}

.action-btn:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow:
    inset 0 2px 3px rgba(255,255,255,0.7),
    0 16px 34px rgba(0,0,0,0.28);
}

.action-btn:active {
  transform: translateY(1px) scale(0.99);
  box-shadow: 0 0 28px rgba(255,255,255,0.45);
}

/* =====================================================
   SETTINGS ICON (ADMIN ENTRY)
===================================================== */

.settings-btn {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background: rgba(255,255,255,0.22);
  backdrop-filter: blur(10px);
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.settings-btn:hover {
  transform: scale(1.08);
  box-shadow: 0 0 18px rgba(255,255,255,0.4);
}

/* =====================================================
   CINEMATIC OVERLAY — 25 SECOND FLOW (UPDATED)
===================================================== */

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 30, 40, 0.92);
  backdrop-filter: blur(14px);

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;

  opacity: 0;
  pointer-events: none;

  /* SLOW FADE-IN FOR BLANK SCREEN */
  transition: opacity 3s ease;

  z-index: 999;
}

.overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.overlay.hidden {
  display: none;
}

/* TITLE */
.overlay h2 {
  color: #ffffff;
  font-size: 32px;
  margin-bottom: 28px;
  opacity: 0;
  transform: translateY(20px);

  transition: opacity 3s ease, transform 3s ease;
}

.overlay.active h2 {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 3s;
}

/* PILLS */

.pill-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 520px;
  text-align: center;
}

.pill {
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
  border-radius: 999px;
  padding: 14px 22px;
  color: white;
  font-weight: 600;
  opacity: 0;
  transform: translateY(18px);

  transition: opacity 3s ease, transform 3s ease;
}

/* STAGGERED PILLS (same pacing you approved) */

.overlay.active .pill:nth-child(1) { transition-delay: 7s; }
.overlay.active .pill:nth-child(2) { transition-delay: 10s; }
.overlay.active .pill:nth-child(3) { transition-delay: 13s; }
.overlay.active .pill:nth-child(4) { transition-delay: 16s; }

.overlay.active .pill {
  opacity: 1;
  transform: translateY(0);
}

/* =====================================================
   NEW EXIT: PURE SLOW FADE OF EVERYTHING (21–25s)
===================================================== */

.overlay.closing {
  opacity: 0;                    /* fades background too */
  transition: opacity 4s ease;   /* smooth, cinematic fade */
}

.overlay.closing h2,
.overlay.closing .pill {
  opacity: 0;                    /* ensures text fades with background */
  transition: none;              /* let parent .overlay handle the fade */
}

/* =====================================================
   MOBILE RESPONSIVENESS
===================================================== */

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

  .teacher-img {
    width: 100%;
    max-width: 380px;
  }

  .big-logo {
    width: 200px;
  }

  .action-btn {
    min-width: 200px;
  }

  .settings-btn {
    width: 42px;
    height: 42px;
  }
}