/* public/css/style.css */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg: #14171c;
  --bg-panel: #1b1f26;
  --bg-panel-2: #21262f;
  --border: #2c333d;
  --text: #dfe4ea;
  --text-dim: #8b93a1;
  --accent: #ffb454;      /* cảm hứng từ cursor terminal nhấp nháy màu hổ phách */
  --accent-dim: #7a5a2a;
  --ac: #3fd07d;
  --wa: #ff6b6b;
  --tle: #ffb454;
  --re: #ff8f4d;
  --ce: #9aa0ab;
  --judging: #5bb8ff;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --sans: 'Inter', system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
}

a { color: inherit; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.02em;
}
.brand .cursor {
  display: inline-block;
  width: 9px; height: 18px;
  background: var(--accent);
  animation: blink 1.1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.topbar nav { display: flex; gap: 22px; align-items: center; font-size: 14px; }
.topbar nav a { text-decoration: none; color: var(--text-dim); transition: color .15s; }
.topbar nav a:hover, .topbar nav a.active { color: var(--text); }

.user-chip {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text-dim);
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-panel-2);
}
.role-badge {
  font-size: 10.5px;
  padding: 1px 6px;
  border-radius: 4px;
  margin-left: 6px;
  text-transform: uppercase;
  letter-spacing: .04em;
}
.role-admin { background: rgba(255,180,84,.15); color: var(--accent); }
.role-student { background: rgba(91,184,255,.15); color: var(--judging); }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.container.wide { max-width: 1280px; }

.center-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.auth-card {
  width: 380px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 34px 30px;
}
.auth-card h1 {
  font-family: var(--mono);
  font-size: 20px;
  margin: 0 0 6px;
}
.auth-card .sub {
  color: var(--text-dim);
  font-size: 13.5px;
  margin-bottom: 24px;
}

label {
  display: block;
  font-size: 12.5px;
  color: var(--text-dim);
  margin: 16px 0 6px;
}
label:first-of-type { margin-top: 0; }

input[type=text], input[type=password], input[type=number], textarea, select {
  width: 100%;
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 7px;
  padding: 10px 12px;
  font-family: var(--sans);
  font-size: 14px;
  outline: none;
  transition: border-color .15s;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }

textarea.code {
  font-family: var(--mono);
  font-size: 13.5px;
  line-height: 1.55;
  min-height: 320px;
  resize: vertical;
  tab-size: 4;
  white-space: pre;
}

button, .btn {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 14px;
  border: none;
  border-radius: 7px;
  padding: 10px 18px;
  cursor: pointer;
  transition: transform .1s, opacity .15s;
}
button:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: #1a1200; }
.btn-primary:hover { opacity: .92; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--text-dim); }
.btn-danger { background: rgba(255,107,107,.15); color: var(--wa); border: 1px solid rgba(255,107,107,.3); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.full { width: 100%; margin-top: 22px; }

.error-msg {
  color: var(--wa);
  font-size: 13px;
  margin-top: 12px;
  min-height: 16px;
}
.hint {
  font-size: 12.5px;
  color: var(--text-dim);
  margin-top: 18px;
  text-align: center;
}

h1.page-title {
  font-family: var(--mono);
  font-size: 24px;
  margin: 0 0 4px;
}
.page-sub { color: var(--text-dim); font-size: 14px; margin-bottom: 28px; }

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 22px;
}

.problem-grid { display: grid; gap: 12px; }
.problem-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  text-decoration: none;
  color: var(--text);
  transition: border-color .15s, transform .1s;
}
.problem-row:hover { border-color: var(--accent); transform: translateX(2px); }
.problem-id {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 12.5px;
  background: rgba(255,180,84,.12);
  padding: 2px 8px;
  border-radius: 5px;
  margin-right: 12px;
}
.problem-meta { color: var(--text-dim); font-size: 12.5px; font-family: var(--mono); }

.verdict-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 20px;
}
.verdict-dot { width: 8px; height: 8px; border-radius: 50%; }

.v-Accepted, .v-AC { background: rgba(63,208,125,.14); color: var(--ac); }
.v-Accepted .verdict-dot, .v-AC .verdict-dot { background: var(--ac); }
.v-Wrong-Answer, .v-WA { background: rgba(255,107,107,.14); color: var(--wa); }
.v-Wrong-Answer .verdict-dot, .v-WA .verdict-dot { background: var(--wa); }
.v-Time-Limit-Exceeded, .v-TLE { background: rgba(255,180,84,.14); color: var(--tle); }
.v-Time-Limit-Exceeded .verdict-dot, .v-TLE .verdict-dot { background: var(--tle); }
.v-Runtime-Error, .v-RE { background: rgba(255,143,77,.14); color: var(--re); }
.v-Runtime-Error .verdict-dot, .v-RE .verdict-dot { background: var(--re); }
.v-Compile-Error { background: rgba(154,160,171,.14); color: var(--ce); }
.v-Compile-Error .verdict-dot { background: var(--ce); }
.v-Judging { background: rgba(91,184,255,.14); color: var(--judging); }
.v-Judging .verdict-dot { background: var(--judging); animation: blink 1s step-end infinite; }
.v-pending { background: rgba(139,147,161,.1); color: var(--text-dim); }
.v-pending .verdict-dot { background: var(--text-dim); }

table.tests-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 13px;
}
table.tests-table th, table.tests-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}
table.tests-table th { color: var(--text-dim); font-weight: 500; font-size: 11.5px; text-transform: uppercase; letter-spacing: .04em; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px,1fr)); gap: 14px; margin: 18px 0; }
.stat-box {
  background: var(--bg-panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
}
.stat-box .label { font-size: 11px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .04em; }
.stat-box .value { font-family: var(--mono); font-size: 20px; font-weight: 700; margin-top: 4px; }

.section-title {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .05em;
  margin: 30px 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-title::before { content: '›'; color: var(--accent); }

pre.log-box, pre.code-box {
  background: #0e1116;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px;
  font-family: var(--mono);
  font-size: 12.8px;
  line-height: 1.6;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin: 0;
}
pre.log-box { color: var(--re); }

.toolbar { display: flex; gap: 10px; align-items: center; }
.form-row { display: flex; gap: 16px; }
.form-row > div { flex: 1; }

.spinner {
  width: 13px; height: 13px;
  border: 2px solid rgba(91,184,255,.25);
  border-top-color: var(--judging);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

.testcase-tc { display: flex; gap: 12px; }
.tc-pair { flex: 1; display: flex; flex-direction: column; gap: 6px; }
.tc-pair textarea { min-height: 90px; font-family: var(--mono); font-size: 12.5px; }
.tc-remove { align-self: flex-start; margin-top: 22px; }
.tc-block { border: 1px solid var(--border); border-radius: 8px; padding: 14px; margin-bottom: 12px; background: var(--bg-panel-2); }
.tc-block .tc-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; font-family: var(--mono); font-size: 12px; color: var(--text-dim); }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-dim); }
.empty-state .big { font-size: 40px; margin-bottom: 10px; }

::selection { background: rgba(255,180,84,.3); }