:root {
  --font-sans: "Inter", sans-serif;
  --text-color: rgb(25, 25, 24);
  --bg-color: #fafafa;
  --border-color: rgba(55, 53, 47, 0.12);
  --space-8: 8px;
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* App Specific */
  --text: rgb(25, 25, 24);
  --muted: rgba(25, 25, 24, 0.6);
  --muted-2: rgba(25, 25, 24, 0.5);
  --border: rgba(55, 53, 47, 0.14);
  --surface: rgba(55, 53, 47, 0.04);
  --hover: rgba(55, 53, 47, 0.08);
  --primary: #2383e2;
  --primary-hover: #1b6dc1;
  --primary-active: #155a9e;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-32) var(--space-24);
}

/* ========== APP HEADER ========== */
.app-header {
  text-align: center;
  margin-bottom: var(--space-24);
  padding: var(--space-16) var(--space-24);
  margin: calc(-1 * var(--space-32)) calc(-1 * var(--space-24)) var(--space-24);
}

.app-header__title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text-color);
  margin: 0;
  padding-bottom: var(--space-16);
}

.app-header__title::after {
  content: "";
  display: block;
  width: 40%;
  height: 1px;
  background: var(--border-color);
  margin: var(--space-16) auto 0;
}

.input-card {
  border: 0.5px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  background: #fff;
}

.input-label {
  display: block;
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  color: rgba(25, 25, 24, 0.9);
}

textarea {
  width: 100%;
  resize: vertical;
  min-height: 120px;
  font-size: 18px;
  line-height: 1.55;
  padding: 12px 12px;
  border-radius: 10px;
  border: 0.5px solid var(--border);
  outline: none;
  color: rgba(25, 25, 24, 0.9);
  background: #fff;
}

textarea:focus {
  border-color: rgba(35, 131, 226, 0.6);
  box-shadow: 0 0 0 4px rgba(35, 131, 226, 0.18);
}

.button-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 16px;
}

.hint {
  font-size: 14px;
  color: var(--muted);
}

.btn-primary {
  font-size: 16px;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 50px;
  border: none;
  background: #000000;
  color: #fff;
  cursor: pointer;
  font-family: "Inter";
}

.btn-primary:hover {
  background: #1a1a1a;
}

.btn-primary:active {
  background: #333333;
}

.btn-primary:disabled {
  background: rgba(0, 0, 0, 0.3);
  opacity: 0.55;
  cursor: not-allowed;
}

.btn-outline {
  font-size: 16px;
  font-weight: 500;
  padding: 10px 16px;
  border-radius: 8px;
  border: 0.5px solid var(--border);
  background: #fff;
  color: rgba(25, 25, 24, 0.9);
  cursor: pointer;
}

.btn-outline:hover {
  background: var(--hover);
}

.loading {
  margin-top: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  border-radius: 12px;
  background: var(--surface);
  border: 0.5px solid var(--border);
}

.spinner {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  border: 1px solid rgba(25, 25, 24, 0.18);
  border-top-color: rgba(25, 25, 24, 0.55);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  from {
    transform: rotate(0deg);
  }

  to {
    transform: rotate(360deg);
  }
}

.loading-text {
  font-size: 16px;
  color: rgba(25, 25, 24, 0.9);
}

.error {
  margin-top: 16px;
  padding: 16px;
  border-radius: 12px;
  border: 0.5px solid rgba(210, 20, 20, 0.18);
  background: rgba(210, 20, 20, 0.05);
}

.error-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.error-message {
  color: rgba(25, 25, 24, 0.8);
  margin-bottom: 12px;
}

.result {
  margin-top: 20px;
  border: 0.5px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}

.result-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

.result-topic {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.005em;
}

.result-sub {
  font-size: 14px;
  color: var(--muted);
  margin-top: 6px;
}

.block {
  padding: 16px;
  border-radius: 12px;
  background: var(--surface);
  border: 0.5px solid var(--border);
  margin-top: 12px;
}

.block-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.block-body {
  font-size: 18px;
  line-height: 1.55;
  color: rgba(25, 25, 24, 0.9);
}

.block-list {
  margin: 0;
  padding-left: 20px;
}

.block-list li {
  font-size: 18px;
  line-height: 1.55;
  margin-bottom: 8px;
  color: rgba(25, 25, 24, 0.9);
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

@media (max-width: 768px) {
  .container {
    padding: var(--space-24) var(--space-16);
  }

  .app-header {
    padding: var(--space-12) var(--space-16);
    margin: calc(-1 * var(--space-24)) calc(-1 * var(--space-16)) var(--space-20);
  }

  .app-header__title {
    font-size: 28px;
  }
}