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

body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* ========== FONTS ========== */
body, input, textarea, select {
  font-family: "Open Sans", sans-serif; 
}

h1, h2, h3 {
  font-family: "Montserrat", sans-serif;
  font-weight: 600;
}

/* ========== GLOBAL ========== */
body {
  margin: 0;
  padding: 0;
  font-family: "Open Sans", sans-serif;

  background-image: url("../images/bg1.jpg");
  background-size: cover;
  background-position: center center;
  background-attachment: fixed;

  /* Dark wash so text is readable */
  background-color: rgba(0,0,0,0.55);
  background-blend-mode: darken;

  color: #fff;
  line-height: 1.5;
}


/* Frosted glass panel boxes */
.group,
.panel-group {
  background: rgba(255,255,255,0.3);
  backdrop-filter: blur(6px);
  border-radius: 8px;
  padding: 15px;
  border: 1px solid rgba(255,255,255,0.4);
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);

  margin-bottom: 16px;    /* NEW: prevents overlap between boxes */
}

/* ========== HEADER ========== */
header {
  background: #111;
  color: white;
  padding: 40px 20px;
  text-align: center;
}

header h1 {
  font-size: 2.4rem;
  margin-bottom: 10px;
}

/* ========== BUTTONS ========== */
.btn {
  background: #f39c12;
  color: #111;
  border: none;
  padding: 12px 22px;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.2s;
}

.btn:hover {
  background: #d8890f;
}

/* ========== LAYOUT ========== */
/* Centre the form on every page */
form {
  max-width: 900px;
  margin: 30px auto;      /* centres horizontally */
  display: grid;
  gap: 20px;
  padding: 0 16px;        /* stops content touching sides on phones */
}


input, select, textarea {
  width: 100%;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #bbb;
  background: rgba(255,255,255,0.8);
}

/* Panel rows (desktop default: more columns) */
.panel-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 10px;
  margin-bottom: 8px;
}

/* Price area */
.small-info {
  font-size: 0.8rem;
  color: #333;
}

/* Price result */
#calcResult {
  font-size: 1.4rem;
  font-weight: 600;
  background: rgba(255,255,255,0.4);
  backdrop-filter: blur(8px);
  padding: 12px;
  border-radius: 6px;
  text-align: center;
}

/* ========== RESPONSIVE ========== */

/* 1) Tablets – reduce to 3 columns */
@media (max-width: 900px) {
  .panel-row {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 2) Small phones – 2 columns */
@media (max-width: 600px) {
  .panel-row {
    grid-template-columns: repeat(2, 1fr);
  }

  header {
    padding: 24px 16px;
  }

  header h1 {
    font-size: 1.8rem;
  }
}

/* 3) Extra small phones – single column for max readability */
@media (max-width: 420px) {
  .panel-row {
    grid-template-columns: 1fr;
  }

  #calcResult {
    font-size: 1.2rem;
  }
}

/* 4) Mobile background fix – avoid janky scrolling */
@media (max-width: 900px) {
  body {
    background-attachment: scroll;   /* overrides "fixed" on mobile */
  }
}
/* Fix misalignment of frosted boxes */
.panel-group,
.group {
  margin: 0 auto;               /* centers them */
  width: 95%;
  max-width: 900px;
}

/* Fix overlapping panels */
.panel-row {
  grid-template-columns: 1fr 1fr 1fr 1fr;   /* reduce width */
}

@media (max-width: 900px) {
  .panel-row {
    grid-template-columns: 1fr 1fr;         /* two per row on tablets */
  }
}

@media (max-width: 600px) {
  .panel-row {
    gr/* Frame guide layouts */
.frame-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 12px;
}

.frame-card {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.frame-card h3 {
  margin-top: 0;
  margin-bottom: 8px;
}

.frame-card ul {
  padding-left: 18px;
  margin: 0;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.checklist-grid h3 {
  margin-top: 0;
}

/* Responsive for frame guide */
@media (max-width: 900px) {
  .frame-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .checklist-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .frame-grid {
    grid-template-columns: 1fr;
  }
}
id-template-columns: 1fr;             /* one per row on mobile */
  }
}