:root {
  --bg: #eaf6fc;
  --card: #ffffff;
  --navy: #16213e;
  --blue-deep: #1565c0;
  --blue-mid: #2f8fd4;
  --blue-light: #7ec8e3;
  --blue-pale: #d6eef9;
  --teal: #0e7490;
  --success: #1e7a4c;
  --error: #c0392b;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'Segoe UI', Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, #ffffff 100%);
  color: var(--navy);
  display: flex;
  justify-content: center;
  padding: 30px 16px 60px;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(21, 101, 192, 0.12);
  padding: 32px 28px;
  max-width: 420px;
  width: 100%;
  text-align: center;
}

.logo { height: 90px; margin-bottom: 6px; }

h1, h2, h3, h4 { margin: 10px 0; color: var(--navy); }

.tagline {
  color: var(--teal);
  letter-spacing: 2px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 20px;
}

hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, var(--blue-light), var(--blue-deep), var(--blue-light));
  margin: 16px 0 20px;
  border-radius: 2px;
}

pre {
  text-align: left;
  background: var(--blue-pale);
  border: 1px solid var(--blue-light);
  border-radius: 10px;
  padding: 16px 18px;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.6;
  white-space: pre-wrap;
}

.choice-row {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 26px;
}

.choice-btn {
  background: var(--blue-pale);
  border: 1px solid var(--blue-light);
  border-radius: var(--radius);
  padding: 18px 22px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.choice-btn:hover {
  background: var(--blue-light);
  transform: translateY(-3px);
  box-shadow: 0 8px 18px rgba(21, 101, 192, 0.18);
}
.choice-btn a { text-decoration: none; color: var(--navy); display: flex; flex-direction: column; align-items: center; }
.choice-btn span { margin-top: 8px; font-weight: 700; }

input[type=file] {
  margin-top: 16px;
  width: 100%;
  padding: 10px;
  border: 1px solid var(--blue-light);
  border-radius: 8px;
  background: var(--blue-pale);
}

input[type=text] {
  width: 100%;
  font-size: 1.6rem;
  text-align: center;
  letter-spacing: 8px;
  padding: 12px;
  box-sizing: border-box;
  border: 1px solid var(--blue-light);
  border-radius: 8px;
  color: var(--navy);
  background: var(--blue-pale);
}
input[type=text]:focus { outline: 2px solid var(--blue-deep); }

.dropzone {
  border: 2px dashed var(--blue-mid);
  border-radius: var(--radius);
  padding: 20px;
  margin: 20px auto;
  background: var(--blue-pale);
}

button {
  padding: 12px 22px;
  font-size: 1rem;
  font-weight: 600;
  margin-top: 16px;
  border: none;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue-deep), var(--blue-mid));
  color: #fff;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.1s ease;
}
button:hover:not(:disabled) { opacity: 0.9; transform: translateY(-1px); }
button:disabled { opacity: 0.4; cursor: not-allowed; }

.code {
  font-size: 2.4rem;
  letter-spacing: 10px;
  font-weight: 800;
  color: var(--blue-deep);
  margin: 16px 0;
}

.msg { margin-top: 12px; font-size: 0.9rem; }
.err { color: var(--error); }
.ok { color: var(--success); }

progress {
  width: 100%;
  margin-top: 16px;
  height: 10px;
  border-radius: 6px;
  overflow: hidden;
}
progress::-webkit-progress-bar { background: var(--blue-pale); border-radius: 6px; }
progress::-webkit-progress-value { background: linear-gradient(90deg, var(--blue-deep), var(--blue-mid)); border-radius: 6px; }
progress::-moz-progress-bar { background: var(--blue-deep); border-radius: 6px; }

#file-info, #status-text { color: var(--teal); font-size: 0.9rem; margin-top: 8px; }

#result-box {
  margin-top: 20px;
  padding: 16px;
  background: var(--blue-pale);
  border-radius: 10px;
}

/* ===== Receive page layout fix ===== */

body:has(#code-input) {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    padding: 30px 20px 50px;
}

/* Logo */
body:has(#code-input) > img {
    width: 210px;
    height: auto;
    object-fit: contain;
    margin: 0 auto 24px;
}

/* Divider */
body:has(#code-input) > hr {
    width: 100%;
    max-width: 560px;
}

/* Heading */
body:has(#code-input) h3 {
    width: 100%;
    max-width: 480px;
    text-align: center;
    font-size: 25px;
    line-height: 1.4;
    margin: 12px auto 24px;
}

/* Input card */
body:has(#code-input) #code-box {
    width: 100%;
    max-width: 480px;
    padding: 28px;
    margin: 0 auto 18px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.8);
    border: 2px dashed var(--blue-mid);
    box-shadow: 0 8px 25px rgba(21, 101, 192, 0.08);
}

/* Four-digit input */
body:has(#code-input) #code-input {
    width: 100%;
    height: 62px;
    font-size: 28px;
    letter-spacing: 12px;
    border-radius: 10px;
}

/* Connect button */
body:has(#code-input) #fetch-btn {
    display: block;
    width: 100%;
    max-width: 480px;
    min-height: 52px;
    margin: 0 auto 16px;
    border-radius: 10px;
}

/* Status, progress and download */
body:has(#code-input) #fetch-msg,
body:has(#code-input) #progress-bar,
body:has(#code-input) #result-box {
    display: block;
    width: 100%;
    max-width: 480px;
    margin: 14px auto;
}

body:has(#code-input) #progress-bar[style*="display:none"] {
    display: none;
}

body:has(#code-input) #result-box:empty {
    display: none;
}

/* Mobile */
@media (max-width: 600px) {
    body:has(#code-input) {
        padding: 24px 16px;
    }

    body:has(#code-input) > img {
        width: 175px;
    }

    body:has(#code-input) h3 {
        font-size: 21px;
    }

    body:has(#code-input) #code-box {
        padding: 20px;
    }
}


/* Additional receive-page phone refinements */
html {
  -webkit-text-size-adjust: 100%;
}

body:has(#code-input) {
  overflow-x: hidden;
}

body:has(#code-input) #code-input {
  min-width: 0;
  letter-spacing: clamp(4px, 2vw, 12px);
}

body:has(#code-input) #result-box {
  overflow-wrap: anywhere;
  word-break: break-word;
}

body:has(#code-input) #result-box a {
  display: inline-block;
  max-width: 100%;
}

body:has(#code-input) #result-box button {
  max-width: 100%;
  min-height: 48px;
}

@media (max-width: 360px) {
  body:has(#code-input) {
    padding: 18px 10px 28px;
  }

  body:has(#code-input) > img {
    width: 160px;
    max-width: 75%;
    margin-bottom: 16px;
  }

  body:has(#code-input) h3 {
    font-size: 19px;
    line-height: 1.4;
  }

  body:has(#code-input) #code-box {
    padding: 14px 12px;
  }

  body:has(#code-input) #code-input {
    height: 54px;
    font-size: 24px;
  }

  body:has(#code-input) #fetch-btn {
    min-height: 48px;
  }
}