:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --primary: #2e5bff;
  --primary-dark: #1d3fbf;
  --text: #1d2433;
  --muted: #5d6879;
  --success: #1f9d74;
  --warning: #f2a93b;
  --danger: #d94d4d;
  --border: #e7ebf3;
  --shadow: 0 18px 45px rgba(20, 34, 66, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #eef4ff 0%, #f7f8fc 100%);
  color: var(--text);
}

.container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
}

.card {
  width: min(680px, 100%);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 32px;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 3vw, 2.6rem);
}

.subtitle,
.filename {
  color: var(--muted);
  margin-bottom: 24px;
}

form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.label {
  font-weight: 600;
}

input[type="file"] {
  border: 1px dashed #b9c4d8;
  border-radius: 12px;
  padding: 14px;
  background: #f9fbff;
}

button,
.back-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover,
.back-link:hover {
  background: var(--primary-dark);
}

.alert {
  background: #fff0f0;
  color: #a93b3b;
  border: 1px solid #f0c3c3;
  border-radius: 12px;
  padding: 12px 14px;
  margin-bottom: 16px;
}

.tips {
  padding-left: 18px;
  color: var(--muted);
  margin-top: 20px;
}

.result-card {
  max-width: 760px;
}

.score-wrap {
  background: #eef4ff;
  border-radius: 18px;
  padding: 20px;
  margin-bottom: 20px;
}

.score-label {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 8px;
}

.score-value {
  font-size: clamp(2rem, 6vw, 3.3rem);
  font-weight: 800;
  color: var(--primary);
}

.status {
  display: inline-block;
  margin-bottom: 20px;
  background: rgba(31, 157, 116, 0.12);
  color: var(--success);
  padding: 8px 12px;
  border-radius: 999px;
  font-weight: 700;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.metric {
  background: #f9fbff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 15px;
}

.metric-label {
  display: block;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 8px;
}

.metric strong {
  font-size: 1.6rem;
}

.summary,
.skills-panel {
  margin-top: 18px;
}

.summary h2,
.skills-panel h2 {
  margin: 0 0 10px;
  font-size: 1.2rem;
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-tag {
  background: #edf2ff;
  color: var(--primary-dark);
  border-radius: 999px;
  padding: 8px 12px;
  font-weight: 600;
}

.success-tag {
  background: #e9f7f2;
  color: #1a7a5d;
}

.warn-tag {
  background: #fff3e1;
  color: #9a6500;
}

.list-box {
  margin: 0;
  padding-left: 20px;
  color: var(--text);
  line-height: 1.8;
}

.back-link {
  margin-top: 22px;
}

@media (max-width: 640px) {
  .card {
    padding: 24px 18px;
  }

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