:root {
  color-scheme: dark;

  --background: #0f172a;
  --card: #1e293b;
  --card-border: #334155;
  --text: #f8fafc;
  --muted: #94a3b8;
  --input: #0f172a;
  --input-border: #475569;
  --button: #6366f1;
  --button-hover: #818cf8;
  --success: #4ade80;
  --error: #f87171;

  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  min-height: 100svh;

  background:
    radial-gradient(
      circle at top,
      #1e293b 0,
      var(--background) 45%
    );

  color: var(--text);
}

button,
input {
  font: inherit;
}

.page {
  min-height: 100vh;
  min-height: 100svh;

  display: flex;
  align-items: center;
  justify-content: center;

  padding: 24px 16px;
}

.card {
  width: 100%;
  max-width: 720px;

  padding: 32px 24px;

  background: rgba(30, 41, 59, 0.9);
  border: 1px solid var(--card-border);
  border-radius: 20px;

  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.35);

  backdrop-filter: blur(12px);
}

/* Locked state */

.icon {
  display: flex;
  align-items: center;
  justify-content: center;

  width: 56px;
  height: 56px;
  margin-bottom: 20px;

  border-radius: 16px;
  background: rgba(99, 102, 241, 0.15);

  font-size: 26px;
}

h1 {
  margin: 0;

  font-size: clamp(1.6rem, 5vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.subtitle {
  margin: 10px 0 28px;

  color: var(--muted);
  line-height: 1.6;
}

label {
  display: block;

  margin-bottom: 8px;

  font-size: 0.875rem;
  font-weight: 600;
}

.input-row {
  display: flex;
  gap: 10px;
}

input {
  min-width: 0;
  flex: 1;

  height: 48px;
  padding: 0 14px;

  color: var(--text);
  background: var(--input);

  border: 1px solid var(--input-border);
  border-radius: 10px;

  outline: none;

  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

input::placeholder {
  color: #64748b;
}

input:focus {
  border-color: var(--button);

  box-shadow:
    0 0 0 3px rgba(99, 102, 241, 0.2);
}

button {
  flex-shrink: 0;

  height: 48px;
  padding: 0 20px;

  color: white;
  background: var(--button);

  border: 0;
  border-radius: 10px;

  font-weight: 600;

  cursor: pointer;

  transition:
    background 0.15s ease,
    transform 0.1s ease;
}

button:hover {
  background: var(--button-hover);
}

button:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.6;
  cursor: wait;
}

.feedback {
  min-height: 24px;
  margin-top: 10px;

  font-size: 0.875rem;
}

.feedback.error {
  color: var(--error);
}

.feedback.success {
  color: var(--success);
}

/* Unlocked state */

.unlocked {
  width: 100%;
}

.document-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;

  height: 40px;
  margin: -8px -8px 24px;
  padding: 0 8px;

  border-bottom: 1px solid var(--card-border);
}

.document-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;

  color: var(--success);

  font-size: 0.8rem;
  font-weight: 600;
}

.success-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;

  width: 18px;
  height: 18px;

  border-radius: 50%;
  background: rgba(74, 222, 128, 0.15);

  font-size: 0.7rem;
}

.back-button {
  justify-self: start;

  height: auto;
  padding: 4px 0;

  color: var(--muted);
  background: transparent;

  font-size: 0.8rem;
  font-weight: 500;
}

.back-button:hover {
  color: var(--text);
  background: transparent;
}

.header-spacer {
  width: 50px;
}

/* Markdown */

.markdown {
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.markdown > :first-child {
  margin-top: 0;
}

.markdown > :last-child {
  margin-bottom: 0;
}

.markdown h1,
.markdown h2,
.markdown h3,
.markdown h4 {
  margin-top: 1.75em;
  margin-bottom: 0.6em;

  line-height: 1.25;
  letter-spacing: -0.02em;
}

.markdown h1 {
  font-size: clamp(1.7rem, 5vw, 2.2rem);
}

.markdown h2 {
  font-size: clamp(1.4rem, 4vw, 1.7rem);
}

.markdown h3 {
  font-size: 1.2rem;
}

.markdown p {
  margin: 1em 0;
}

.markdown a {
  color: #a5b4fc;
}

.markdown ul,
.markdown ol {
  padding-left: 1.5rem;
}

.markdown li + li {
  margin-top: 0.35rem;
}

.markdown blockquote {
  margin: 1.25rem 0;
  padding: 0.25rem 1rem;

  color: var(--muted);

  border-left: 3px solid var(--button);
  background: rgba(15, 23, 42, 0.5);
}

.markdown code {
  padding: 0.15em 0.35em;

  background: rgba(15, 23, 42, 0.8);
  border-radius: 5px;

  font-size: 0.9em;
}

.markdown pre {
  margin: 1.25rem 0;
  padding: 16px;

  overflow-x: auto;

  background: #0f172a;
  border: 1px solid var(--card-border);
  border-radius: 10px;
}

.markdown pre code {
  padding: 0;
  background: transparent;
}

.markdown hr {
  margin: 2rem 0;

  border: 0;
  border-top: 1px solid var(--card-border);
}

.markdown img {
  display: block;

  max-width: 100%;
  height: auto;

  margin: 1.5rem auto;

  border-radius: 10px;
}

.markdown table {
  width: 100%;
  margin: 1.25rem 0;

  border-collapse: collapse;

  display: block;
  overflow-x: auto;
}

.markdown th,
.markdown td {
  padding: 8px 12px;

  text-align: left;
  white-space: nowrap;

  border-bottom: 1px solid var(--card-border);
}

/* Mobile */

@media (max-width: 480px) {
  .page {
    padding: 16px;
  }

  .card {
    padding: 28px 20px;
    border-radius: 16px;
  }

  .input-row {
    flex-direction: column;
  }

  input,
  .input-row button {
    width: 100%;
  }

  .document-header {
    margin-left: -4px;
    margin-right: -4px;
  }
}