* {
  box-sizing: border-box;
}

:root {
  --bg: #f2f5fb;
  --bg-accent: #e9eefc;
  --card-bg: #ffffff;
  --text: #182230;
  --subtle: #5a6575;
  --accent: #2d61f5;
  --accent-hover: #1f4dd0;
  --border: #dde4f1;
  --success-bg: #e6f6ea;
  --success-text: #18643a;
  --focus: #8aa9ff;
  --shadow-sm: 0 8px 20px rgba(18, 32, 58, 0.06);
  --shadow-md: 0 18px 38px rgba(18, 32, 58, 0.1);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(circle at top left, var(--bg-accent), transparent 42%), var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: min(980px, 92%);
  margin: 20px auto 44px;
  display: grid;
  gap: 14px;
}

.card {
  position: relative;
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow-sm);
  padding: 18px;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, rgba(45, 97, 245, 0.3), transparent);
  pointer-events: none;
}

h1,
h2 {
  margin-top: 0;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(1.42rem, 4.8vw, 2rem);
  line-height: 1.2;
  margin-bottom: 10px;
}

h2 {
  font-size: clamp(1.04rem, 3.3vw, 1.25rem);
  margin-bottom: 14px;
}

.subtitle {
  margin: 0;
  color: var(--subtle);
  line-height: 1.65;
  font-size: 0.98rem;
}

.label {
  display: inline-block;
  margin-bottom: 9px;
  font-weight: 600;
  font-size: 0.94rem;
}

.input-hint {
  margin: 10px 0 0;
  color: var(--subtle);
  font-size: 0.92rem;
  line-height: 1.5;
}

input[type="file"] {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  margin-bottom: 14px;
  font: inherit;
  color: var(--subtle);
}

.large-textarea {
  width: 100%;
  min-height: 170px;
  resize: vertical;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #ffffff;
  padding: 14px;
  font: inherit;
  line-height: 1.62;
  color: var(--text);
}

.large-textarea::placeholder {
  color: #8a95a6;
}

.large-textarea:focus,
input[type="file"]:focus,
.btn:focus {
  border-color: var(--focus);
  outline: 3px solid rgba(138, 169, 255, 0.25);
  outline-offset: 0;
}

.divider {
  text-align: center;
  margin: 8px 0 14px;
  color: var(--subtle);
  font-weight: 600;
  font-size: 0.92rem;
}

.button-row {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  border-radius: 12px;
  padding: 11px 16px;
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  min-height: 44px;
  cursor: pointer;
  transition: background 0.22s ease, transform 0.12s ease, box-shadow 0.22s ease, border-color 0.22s ease;
  box-shadow: 0 2px 6px rgba(18, 32, 58, 0.04);
}

.btn:hover {
  background: #f6f8fe;
  border-color: #cfd8ea;
}

.btn:active {
  transform: translateY(1px) scale(0.996);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 10px 20px rgba(45, 97, 245, 0.3);
}

.btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.loader {
  margin-top: 12px;
  padding: 12px 13px;
  border-radius: 12px;
  border: 1px solid #dbe8ff;
  background: #f0f5ff;
  color: #1d4ed8;
  font-weight: 600;
  font-size: 0.93rem;
}

.notice {
  margin-top: 12px;
  padding: 12px 13px;
  border-radius: 12px;
  border: 1px solid #cdecd8;
  background: var(--success-bg);
  color: var(--success-text);
  font-weight: 600;
  font-size: 0.93rem;
}

.hidden {
  display: none;
}

@media (max-width: 760px) {
  .container {
    width: min(680px, 94%);
    margin-top: 14px;
    gap: 14px;
  }

  .card {
    border-radius: 16px;
    padding: 15px;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .large-textarea {
    min-height: 150px;
  }
}

@media (min-width: 761px) {
  .container {
    margin-top: 28px;
    gap: 18px;
  }

  .card {
    padding: 22px;
    border-radius: 22px;
  }

  .card:first-child {
    box-shadow: var(--shadow-md);
  }
}