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

:root {
  --ink: #0F1419;
  --paper: #F9FAFB;
  --paper-dim: #D1D5DB;
  --paper-ghost: #9CA3AF;
  
  --academic-red: #DC2626;
  --academic-red-dim: #B91C1C;
  --deep-blue: #1E3A5F;
  
  --border: rgba(249, 250, 251, 0.12);
  --surface: rgba(249, 250, 251, 0.03);
  
  --serif: 'Crimson Pro', Georgia, serif;
  --sans: 'Inter', -apple-system, sans-serif;
  --mono: 'Cascadia Code', Consolas, monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--sans);
  background: var(--ink);
  color: var(--paper);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* Typography — Editorial hierarchy */
h1 {
  font-family: var(--serif);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

h2 {
  font-family: var(--serif);
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  border-left: 4px solid var(--academic-red);
  padding-left: 1rem;
}

h3 {
  font-family: var(--sans);
  font-size: 1.125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--paper-dim);
  margin-bottom: 1rem;
}

.hint {
  font-size: 1rem;
  color: var(--paper-ghost);
  line-height: 1.8;
  margin-bottom: 2rem;
  font-style: italic;
}

/* Layout */
header {
  background: rgba(15, 20, 25, 0.95);
  border-bottom: 1px solid var(--border);
  padding: 2rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

header .container {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: baseline;
  gap: 2rem;
}

.student-badge {
  font-size: 0.875rem;
  color: var(--paper-ghost);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.student-badge strong {
  color: var(--academic-red);
  margin-left: 0.75rem;
  font-weight: 600;
}

.tabs {
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  display: flex;
  gap: 0;
}

.tabs button {
  background: none;
  border: none;
  color: var(--paper-ghost);
  padding: 1.25rem 2rem;
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.15s;
  position: relative;
}

.tabs button:hover {
  color: var(--paper-dim);
  background: rgba(249, 250, 251, 0.02);
}

.tabs button.active {
  color: var(--academic-red);
  border-bottom-color: var(--academic-red);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
}

main {
  padding: 4rem 2rem;
  min-height: calc(100vh - 240px);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Cards — Magazine article style */
.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3rem;
  margin-bottom: 3rem;
  position: relative;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: linear-gradient(180deg, var(--academic-red) 0%, transparent 100%);
}

/* Forms */
label {
  display: block;
  margin-bottom: 2rem;
}

label span {
  display: block;
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--paper-dim);
  margin-bottom: 0.75rem;
}

input[type="text"],
input[type="number"],
select,
textarea {
  width: 100%;
  background: rgba(249, 250, 251, 0.05);
  border: 1px solid var(--border);
  border-radius: 2px;
  padding: 1rem 1.25rem;
  color: var(--paper);
  font-family: var(--sans);
  font-size: 1rem;
  transition: all 0.2s;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--academic-red);
  background: rgba(249, 250, 251, 0.08);
}

textarea {
  font-family: var(--mono);
  line-height: 1.7;
  min-height: 160px;
  resize: vertical;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0;
}

.checkbox input {
  width: 1.25rem;
  height: 1.25rem;
  accent-color: var(--academic-red);
}

.checkbox span {
  font-size: 0.9375rem;
  color: var(--paper-dim);
}

/* Buttons */
button {
  background: rgba(249, 250, 251, 0.05);
  border: 1px solid var(--border);
  border-radius: 0;
  padding: 0.875rem 2rem;
  color: var(--paper-dim);
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.2s;
}

button:hover {
  background: rgba(249, 250, 251, 0.08);
  border-color: var(--paper-dim);
  color: var(--paper);
}

button.primary {
  background: var(--academic-red);
  border: none;
  color: white;
}

button.primary:hover {
  background: var(--academic-red-dim);
}

button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.actions {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  border: 1px solid var(--border);
}

thead {
  background: rgba(249, 250, 251, 0.03);
  border-bottom: 2px solid var(--border);
}

th {
  text-align: left;
  padding: 1rem 1.5rem;
  font-weight: 600;
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--paper-dim);
}

td {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--paper-dim);
}

tr:hover {
  background: rgba(249, 250, 251, 0.02);
}

/* Preview */
.preview {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 2px solid var(--border);
}

#preview-content {
  background: rgba(249, 250, 251, 0.03);
  border: 1px solid var(--border);
  padding: 2rem;
  max-height: 500px;
  overflow-y: auto;
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.9;
}

.preview-word {
  color: var(--academic-red);
  font-weight: 700;
}

.preview-sense {
  color: var(--paper-ghost);
  margin-left: 2rem;
}

/* Test UI — Magazine cover style */
.test-config {
  display: grid;
  grid-template-columns: 400px 1fr;
  gap: 3rem;
}

.test-form {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3rem;
}

.test-preview {
  background: rgba(249, 250, 251, 0.02);
  border: 1px solid var(--border);
  padding: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--paper-ghost);
  text-align: center;
  font-style: italic;
}

.test-active {
  max-width: 900px;
  margin: 0 auto;
}

.test-header {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 2rem;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border);
}

.progress {
  font-family: var(--serif);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--academic-red);
  line-height: 1;
}

.timer {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--paper);
  text-align: right;
}

/* Question card — Cover article style */
.question-card {
  background: var(--surface);
  border: 2px solid var(--academic-red);
  padding: 4rem;
  margin-bottom: 3rem;
  position: relative;
}

.question-card::before {
  content: 'VOCABULARY TEST';
  position: absolute;
  top: 2rem;
  left: 4rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--paper-ghost);
  text-transform: uppercase;
}

.asked-sense {
  margin-top: 3rem;
  margin-bottom: 4rem;
}

.pos {
  display: inline-block;
  background: var(--academic-red);
  color: white;
  padding: 0.5rem 1.25rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.meaning {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
  font-style: italic;
  border-left: 4px solid var(--academic-red);
  padding-left: 2rem;
  margin-bottom: 1rem;
}

.hint-letters {
  font-family: var(--mono);
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: 0.3em;
  color: var(--paper);
  text-align: center;
  padding: 3rem;
  background: rgba(220, 38, 38, 0.08);
  border: 2px solid var(--academic-red);
  margin-bottom: 3rem;
  text-transform: uppercase;
}

#answer-spelling {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: lowercase;
}

/* Feedback */
.feedback {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 4rem;
  text-align: center;
}

.result {
  font-family: var(--serif);
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 3rem;
  line-height: 1;
}

.result.correct {
  color: #10B981;
}

.result.wrong {
  color: var(--academic-red);
}

.answer-box {
  background: rgba(249, 250, 251, 0.03);
  border-left: 4px solid var(--border);
  padding: 2rem;
  margin-bottom: 2rem;
  text-align: left;
  line-height: 1.9;
}

.answer-box strong {
  font-family: var(--sans);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--paper-dim);
  display: block;
  margin-bottom: 1rem;
}

/* Results — Newspaper layout */
.records-scroll {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.record-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 3rem;
  position: relative;
}

.record-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--academic-red) 0%, transparent 100%);
}

.record-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 2px solid var(--border);
}

.stat {
  text-align: center;
}

.stat-value {
  font-family: var(--serif);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--academic-red);
  display: block;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--paper-ghost);
}

.record-meta {
  color: var(--paper-ghost);
  font-size: 0.9375rem;
  margin-bottom: 2rem;
  font-style: italic;
}

.wrong-word {
  background: rgba(220, 38, 38, 0.05);
}

/* Footer */
footer {
  background: rgba(249, 250, 251, 0.02);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--paper-ghost);
  line-height: 1.9;
  font-style: italic;
}

footer p {
  margin-bottom: 0.75rem;
}

/* Responsive */
@media (max-width: 968px) {
  .test-config {
    grid-template-columns: 1fr;
  }
  
  .records-scroll {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .record-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}