/*
 * Rails Tutor styles — Mario palette, 90s tech vibe.
 * Plain CSS, no framework, no external fonts (self-contained for LAN use).
 */

:root {
  --mario-red: #e4000f;
  --mario-red-dark: #9c0009;
  --mario-blue: #049cd8;
  --mario-blue-dark: #026690;
  --mario-sky: #5c94fc;
  --mario-sky-light: #8fb8ff;
  --mario-yellow: #fbd000;
  --mario-yellow-dark: #c79900;
  --mario-green: #43b047;
  --mario-green-dark: #2d7a30;
  --mario-brown: #b86f35;
  --mario-brown-dark: #7a4a20;
  --ink: #1a1a1a;
  --paper: #fff8e7;
  --card: #ffffff;
}

* { box-sizing: border-box; }

html, body { overflow-x: hidden; }

body {
  margin: 0;
  font-family: Verdana, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--ink);
  line-height: 1.55;
  background:
    radial-gradient(circle at 15% 15%, rgba(255,255,255,0.9) 0 22px, transparent 23px),
    radial-gradient(circle at 22% 10%, rgba(255,255,255,0.9) 0 16px, transparent 17px),
    radial-gradient(circle at 80% 8%, rgba(255,255,255,0.85) 0 20px, transparent 21px),
    radial-gradient(circle at 60% 20%, rgba(255,255,255,0.8) 0 14px, transparent 15px),
    linear-gradient(var(--mario-sky), var(--mario-sky-light) 60%, var(--mario-sky-light));
  background-repeat: repeat-x, repeat-x, repeat-x, repeat-x, no-repeat;
  background-size: 400px 200px, 400px 200px, 500px 220px, 500px 220px, 100% 100%;
  min-height: 100vh;
}

/* --- 90s marquee strip --- */
.marquee-bar {
  background: var(--ink);
  color: var(--mario-yellow);
  overflow: hidden;
  white-space: nowrap;
  font-family: "Courier New", monospace;
  font-weight: bold;
  font-size: 0.8rem;
  padding: 4px 0;
  letter-spacing: 1px;
}

.marquee-track {
  display: inline-block;
  padding-left: 100%;
  animation: marquee 18s linear infinite;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-100%); }
}

/* --- Header --- */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 20px;
  background: var(--mario-red);
  border-bottom: 6px solid var(--ink);
  box-shadow: 0 4px 0 var(--mario-red-dark) inset;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.brand-icon { font-size: 1.6rem; filter: drop-shadow(2px 2px 0 var(--ink)); }

.brand-text {
  font-family: "Arial Black", Impact, Verdana, sans-serif;
  font-weight: 900;
  font-size: 1.3rem;
  color: var(--mario-yellow);
  letter-spacing: 1px;
  text-shadow:
    2px 0 0 var(--ink), -2px 0 0 var(--ink),
    0 2px 0 var(--ink), 0 -2px 0 var(--ink),
    3px 3px 0 var(--mario-red-dark);
}

.nav-link {
  display: inline-block;
  background: var(--mario-yellow);
  color: var(--ink);
  text-decoration: none;
  font-weight: bold;
  font-size: 0.9rem;
  padding: 10px 16px;
  border: 3px solid var(--ink);
  border-radius: 6px;
  box-shadow: 3px 3px 0 var(--ink);
}

.nav-link:hover { transform: translate(1px, 1px); box-shadow: 2px 2px 0 var(--ink); }

/* --- Layout --- */
main {
  max-width: 780px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.flash {
  padding: 10px 14px;
  border: 3px solid var(--ink);
  border-radius: 6px;
  margin-bottom: 16px;
  font-weight: bold;
  font-size: 0.95rem;
  box-shadow: 3px 3px 0 var(--ink);
}

.flash.notice { background: var(--mario-green); color: #fff; }
.flash.alert { background: var(--mario-red); color: #fff; }

h1 {
  font-family: "Arial Black", Impact, Verdana, sans-serif;
  font-size: 1.8rem;
  margin-bottom: 4px;
  color: var(--mario-red);
  text-shadow: 2px 2px 0 var(--ink);
}

h2 {
  font-family: "Arial Black", Impact, Verdana, sans-serif;
  font-size: 1.15rem;
  margin-top: 2em;
  color: var(--mario-blue-dark);
}

/* --- Curriculum hero --- */
.hero {
  text-align: center;
  background: var(--paper);
  border: 4px solid var(--ink);
  border-radius: 10px;
  padding: 22px 16px;
  margin-bottom: 26px;
  box-shadow: 6px 6px 0 var(--ink);
}

.hero-title {
  margin: 0 0 6px;
}

.hero-subtitle {
  margin: 0 0 14px;
  color: #555;
  font-size: 0.95rem;
}

.btn-continue {
  font-size: 1.05rem;
}

/* --- Buttons (chunky 90s 3D blocks) --- */
.exercise input[type="submit"], .btn {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 20px;
  background: var(--mario-yellow);
  color: var(--ink);
  border: 3px solid var(--ink);
  border-radius: 6px;
  font-weight: bold;
  font-size: 0.95rem;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--ink);
  transition: transform 0.05s, box-shadow 0.05s;
}

.exercise input[type="submit"]:hover, .btn:hover {
  background: var(--mario-yellow-dark);
}

.exercise input[type="submit"]:active, .btn:active {
  transform: translate(3px, 3px);
  box-shadow: 1px 1px 0 var(--ink);
}

/* --- Explanation text --- */
.explanation p { margin: 0.8em 0; }
.explanation code {
  background: var(--mario-yellow);
  color: var(--ink);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--ink);
}

.unit-description { color: #444; font-size: 0.9rem; margin: 0 0 10px; }

.explanation hr {
  border: none;
  border-top: 3px dashed var(--mario-brown);
  margin: 1.4em 0;
}

.explanation a {
  color: var(--mario-blue-dark);
  font-weight: bold;
  text-decoration: underline;
}

.explanation a:hover { color: var(--mario-red); }

/* --- Login --- */
.login-hero { max-width: 420px; margin-left: auto; margin-right: auto; }

.login-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  margin-top: 6px;
}

.login-form label { font-weight: bold; font-size: 0.9rem; }

.login-input {
  font-family: "Courier New", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 16px;
  border: 3px solid var(--ink);
  border-radius: 6px;
  padding: 10px;
}

/* --- Exercises --- */
.exercise {
  border: 4px solid var(--ink);
  border-radius: 10px;
  padding: 16px;
  margin: 20px 0;
  background: var(--card);
  box-shadow: 5px 5px 0 var(--ink);
}

.exercise-prompt { font-weight: bold; margin-bottom: 10px; }

.exercise textarea {
  width: 100%;
  font-family: "Courier New", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  /* 16px minimum — smaller triggers an auto-zoom on focus in iOS Safari */
  font-size: 16px;
  border: 3px solid var(--ink);
  border-radius: 6px;
  padding: 10px;
  background: #0b1a0b;
  color: #3dff5c;
  resize: vertical;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 10px 0;
}

.choices label {
  display: flex;
  gap: 10px;
  align-items: center;
  cursor: pointer;
  background: var(--paper);
  border: 2px solid var(--ink);
  border-radius: 6px;
  padding: 12px 14px;
  min-height: 24px;
}

.choices input[type="radio"] {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  accent-color: var(--mario-red);
}

/* --- Feedback --- */
.feedback {
  margin-top: 14px;
  padding: 10px 12px;
  border: 3px solid var(--ink);
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: bold;
  animation: pop-in 0.15s ease-out;
}

@keyframes pop-in {
  from { transform: scale(0.9); opacity: 0.5; }
  to { transform: scale(1); opacity: 1; }
}

.feedback pre {
  white-space: pre-wrap;
  word-break: break-word;
  margin: 6px 0 0;
  font-size: 0.85em;
  font-weight: normal;
  font-family: "Courier New", monospace;
}

.feedback.pass { background: var(--mario-green); color: #fff; }
.feedback.fail { background: var(--mario-red); color: #fff; }

.lesson-complete {
  font-family: "Arial Black", Impact, Verdana, sans-serif;
  font-size: 1.1rem;
  color: var(--mario-green-dark);
  text-shadow: 1px 1px 0 #fff;
}

/* --- Curriculum map --- */
.unit {
  margin-bottom: 26px;
  background: var(--card);
  border: 4px solid var(--ink);
  border-radius: 10px;
  padding: 16px 18px;
  box-shadow: 5px 5px 0 var(--ink);
  border-top: 10px solid var(--mario-red);
}

.unit-0 { border-top-color: var(--mario-red); }
.unit-1 { border-top-color: var(--mario-blue); }
.unit-2 { border-top-color: var(--mario-green); }
.unit-3 { border-top-color: var(--mario-yellow-dark); }
.unit-4 { border-top-color: var(--mario-brown); }

.unit-title {
  font-size: 1.15rem;
  margin: 0 0 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.unit-flag { font-size: 1.1rem; }

.coming-soon {
  font-weight: bold;
  color: var(--mario-brown-dark);
  background: repeating-linear-gradient(
    45deg, #e8d5b7, #e8d5b7 10px, #ddc4a0 10px, #ddc4a0 20px
  );
  border: 2px dashed var(--mario-brown-dark);
  border-radius: 6px;
  padding: 8px 10px;
  text-align: center;
}

.lesson-list { list-style: none; padding: 0; margin: 0; }

.lesson-block {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: 3px solid var(--ink);
  border-radius: 6px;
  margin-bottom: 8px;
  font-weight: bold;
}

.lesson-block a { color: var(--ink); text-decoration: none; }
.lesson-block a:hover { text-decoration: underline; }

.lesson-unlocked {
  background: var(--mario-blue);
  color: #fff;
  box-shadow: 3px 3px 0 var(--ink);
}
.lesson-unlocked a { color: #fff; }

.lesson-completed {
  background: var(--mario-green);
  color: #fff;
  box-shadow: 3px 3px 0 var(--ink);
}
.lesson-completed a { color: #fff; }

.lesson-locked {
  background: repeating-linear-gradient(
    135deg, #cfcfcf, #cfcfcf 8px, #b8b8b8 8px, #b8b8b8 16px
  );
  color: #555;
  font-weight: normal;
}

.status-icon { width: 1.2em; text-align: center; }

/* --- Footer --- */
.site-footer {
  text-align: center;
  padding: 14px;
  background: var(--ink);
  color: var(--mario-yellow);
  font-family: "Courier New", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
}

/* --- Rouge syntax highlighting (GitHub dark theme), chunky-framed --- */
.highlight table td { padding: 5px; }
.highlight table pre { margin: 0; }
.highlight, .highlight .w {
  color: #c9d1d9;
  background-color: #161b22;
}
.highlight {
  border-radius: 8px;
  padding: 14px;
  overflow-x: auto;
  font-size: 0.88rem;
  border: 3px solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
}
.highlight .k, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .kt, .highlight .kv {
  color: #ff7b72;
}
.highlight .gr { color: #f0f6fc; }
.highlight .gd { color: #ffdcd7; background-color: #67060c; }
.highlight .nb { color: #ffa657; }
.highlight .nc { color: #ffa657; }
.highlight .no { color: #ffa657; }
.highlight .nn { color: #ffa657; }
.highlight .sr { color: #7ee787; }
.highlight .na { color: #7ee787; }
.highlight .nt { color: #7ee787; }
.highlight .gi { color: #aff5b4; background-color: #033a16; }
.highlight .ges { font-weight: bold; font-style: italic; }
.highlight .kc { color: #79c0ff; }
.highlight .l, .highlight .ld, .highlight .m, .highlight .mb, .highlight .mf, .highlight .mh, .highlight .mi, .highlight .il, .highlight .mo, .highlight .mx {
  color: #79c0ff;
}
.highlight .sb { color: #79c0ff; }
.highlight .bp { color: #79c0ff; }
.highlight .ne { color: #79c0ff; }
.highlight .nl { color: #79c0ff; }
.highlight .py { color: #79c0ff; }
.highlight .nv, .highlight .vc, .highlight .vg, .highlight .vi, .highlight .vm { color: #79c0ff; }
.highlight .o, .highlight .ow { color: #79c0ff; }
.highlight .gh { color: #1f6feb; font-weight: bold; }
.highlight .gu { color: #1f6feb; font-weight: bold; }
.highlight .s, .highlight .sa, .highlight .sc, .highlight .dl, .highlight .sd, .highlight .s2, .highlight .se, .highlight .sh, .highlight .sx, .highlight .s1, .highlight .ss {
  color: #a5d6ff;
}
.highlight .nd { color: #d2a8ff; }
.highlight .nf, .highlight .fm { color: #d2a8ff; }
.highlight .err { color: #f0f6fc; background-color: #8e1519; }
.highlight .c, .highlight .ch, .highlight .cd, .highlight .cm, .highlight .cp, .highlight .cpf, .highlight .c1, .highlight .cs {
  color: #8b949e;
}
.highlight .gl { color: #8b949e; }
.highlight .gt { color: #8b949e; }
.highlight .ni { color: #c9d1d9; }
.highlight .si { color: #c9d1d9; }
.highlight .ge { color: #c9d1d9; font-style: italic; }

/* --- Small phones --- */
@media (max-width: 480px) {
  .brand-text { font-size: 1.05rem; }
  .brand-icon { font-size: 1.3rem; }
  .nav-link { font-size: 0.8rem; padding: 8px 12px; }
  .hero-title { font-size: 1.4rem; }
  h1 { font-size: 1.4rem; }
  .marquee-track { font-size: 0.7rem; }
  main { padding: 18px 14px 50px; }
}
.highlight .gs { color: #c9d1d9; font-weight: bold; }