/* GOOGLE FONT */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* BOOTSTRAP ICONS */
@import url('https://cdn.jsdelivr.net/npm/bootstrap-icons@1.13.1/font/bootstrap-icons.min.css');

:root {
  --bg: #0f1117;
  --surface: #181c24;
  --surface-2: #202632;
  --border: #2f3746;

  --text: #f5f7fb;
  --muted: #9aa4b2;

  --primary: #4f8cff;
  --primary-hover: #3b7cff;

  --success: #39d98a;
  --danger: #ff5d73;

  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background:
    radial-gradient(circle at top, #1d2330 0%, #0f1117 50%);
  color: var(--text);
  min-height: 100vh;
}

.container {
  width: 100%;
  max-width: 950px;
  margin: auto;
  padding: 30px 20px 50px;
}

header {
  text-align: center;
  padding: 40px 0 30px;
}

header h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.1;
}

header p {
  margin-top: 14px;
  color: var(--muted);
  font-size: 1.05rem;
}

.box,
.content {
  background: rgba(24, 28, 36, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px;
  margin-bottom: 25px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
  text-align: center;
}

.box h2,
.content h2 {
  margin-top: 0;
  font-size: 1.7rem;
}

.content h3 {
  margin-top: 30px;
  font-size: 1.2rem;
}

.content p,
.content li,
.box p {
  color: var(--muted);
  line-height: 1.8;
}

.content ol {
  padding-left: 0;
  list-style-position: inside;
}

/* DRAG & DROP STYLE */
input[type="file"] {
  width: 100%;
  max-width: 520px;
  margin: 25px auto;
  padding: 45px 20px;
  border: 2px dashed var(--border);
  border-radius: 18px;
  background: var(--surface-2);
  color: var(--muted);
  cursor: pointer;
  transition: 0.25s ease;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
}

input[type="file"]:hover {
  border-color: var(--primary);
  background: #253247;
}

input[type="file"]::file-selector-button {
  display: none;
}

button {
  border: none;
  background: linear-gradient(
    135deg,
    var(--primary),
    #6ea8ff
  );

  color: white;
  font-family: inherit;
  font-weight: 700;
  font-size: 1rem;

  padding: 15px 28px;
  border-radius: 14px;

  cursor: pointer;
  transition: 0.25s ease;

  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;

  box-shadow:
    0 8px 25px rgba(79, 140, 255, 0.35);
}

button:hover {
  transform: translateY(-2px);
  background: linear-gradient(
    135deg,
    var(--primary-hover),
    #5d98ff
  );
}

button:active {
  transform: scale(0.98);
}

#status {
  margin-top: 18px;
  font-size: 0.95rem;
  color: var(--success);
}

footer {
  text-align: center;
  padding: 35px 20px;
  color: #6f7b8d;
  font-size: 0.95rem;
}

/* MOBILE */
@media (max-width: 640px) {

  .container {
    padding: 20px 14px 40px;
  }

  .box,
  .content {
    padding: 22px 18px;
    border-radius: 18px;
  }

  button {
    width: 100%;
  }

  input[type="file"] {
    padding: 35px 15px;
  }
}