/* ==============================
   Global reset & safety
============================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden; /* HARD STOP horizontal scroll */
  margin: 0;
  padding: 0;
}

/* ==============================
   Base body styles
============================== */
body {
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
  color: #ffffff;
  padding: 1rem;
}

/* ==============================
   Main container (critical)
============================== */
.container {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 1.25rem;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  overflow-x: hidden; /* safety */
}

/* ==============================
   Header
============================== */
.header {
  text-align: center;
  width: 100%;
}

.header img {
  display: block;
  width: 100%;
  max-width: 140px; /* HARD LIMIT */
  height: auto;
  margin: 0 auto 1rem;
}

/* ==============================
   Typography
============================== */
h2 {
  margin: 0 0 1rem;
  font-size: 1.3rem;
  color: #22c55e;
}

h3 {
  margin-top: 2rem;
  font-size: 1.1rem;
  color: #a7f3d0;
}

ol {
  padding-left: 1.25rem;
}

ol li {
  margin-bottom: 0.6rem;
}

/* ==============================
   ESP install button safety
============================== */
esp-web-install-button {
  display: block;
  width: 100%;
  max-width: 100%;
  margin: 1.5rem auto;
}

/* ==============================
   Helper text
============================== */
.hint {
  margin-top: 1rem;
  font-size: 0.9rem;
  opacity: 0.85;
}

.hint strong {
  color: #facc15;
}

/* ==============================
   Inputs & buttons
============================== */
label {
  display: block;
  width: 100%;
}

input {
  width: 100%;
  max-width: 100%;
  padding: 10px;
  margin-top: 4px;
  border-radius: 8px;
  border: none;
  font-size: 1rem;
}

button {
  display: block;
  width: 100%;
  margin-top: 1rem;
  padding: 12px;
  font-size: 1rem;
  border-radius: 10px;
  border: none;
  background: #22c55e;
  color: #052e16;
  cursor: pointer;
}

button:hover {
  background: #16a34a;
}

/* ==============================
   Images (global hard limits)
============================== */
img {
  display: block;
  max-width: 100%;
  width: 100%;
  height: auto;
}

/* ==============================
   Video thumbnail (CRITICAL)
============================== */
.video-thumb {
  position: relative;
  display: block;
  width: 100%;
  max-width: 100%;
  margin-top: 1rem;
  overflow: hidden;
}

.video-thumb img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

/* Optional play icon if you add it later */
.play-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 3rem;
  color: white;
  text-shadow: 0 0 15px rgba(0, 0, 0, 0.8);
  pointer-events: none;
}

/* ==============================
   Footer
============================== */
.footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.8;
}

/* ==============================
   Horizontal rule
============================== */
hr {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  margin: 2rem 0;
}

/* ==============================
   Mobile-specific tuning
============================== */
@media (max-width: 480px) {
  body {
    padding: 0.75rem;
  }

  .container {
    padding: 1rem;
    border-radius: 12px;
  }

  .header img {
    max-width: 120px;
  }

  h2 {
    font-size: 1.15rem;
  }

  h3 {
    font-size: 1rem;
  }
}