/* =========================================================
   THE EXHAUSTED NERD - core stylesheet
   ========================================================= */

:root{
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-card: #15151f;
  --border: rgba(255,255,255,0.09);
  --border-strong: rgba(255,255,255,0.16);

  --text: #e6e6e6;
  --text-dim: #8b8b9a;
  --text-faint: #55555f;

  --accent: #00d4aa;
  --accent-dim: #0a3d33;
  --accent-glow: rgba(0,212,170,0.30);

  --amber: #ffb000;
  --amber-dim: #4a3400;
  --amber-glow: rgba(255,176,0,0.30);

  --danger: #ff4444;
  --success: #00ff88;

  --heart: #ff5d7a;
  --diamond: #4dd2ff;
  --spade: #c9a6ff;
  --crown: #ffd76b;

  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 18px;

  --maxw: 1120px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(0,212,170,0.06), transparent 60%),
    radial-gradient(ellipse 700px 500px at 90% 10%, rgba(255,176,0,0.05), transparent 60%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
h1,h2,h3,h4{ font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; margin: 0 0 0.5em; }
p{ margin: 0 0 1em; color: var(--text-dim); }
a{ color: var(--accent); text-decoration: none; }
a:hover{ text-decoration: underline; }
ul{ padding: 0; margin: 0; list-style: none; }
img{ max-width: 100%; display: block; }
button, input{ font-family: inherit; }

:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

.wrap{ max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- header / nav ---------- */
.site-header{
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,10,15,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.navbar{
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 24px; gap: 20px;
}
.logo{
  font-family: var(--font-mono); font-weight: 700; font-size: 15px;
  color: var(--text); letter-spacing: 0.02em;
  flex-shrink: 0;
  order: 1;
}
.logo:hover{ text-decoration: none; color: var(--accent); }
.logo .cursor{
  color: var(--accent);
  animation: blink 1.1s step-end infinite;
}
.nav-links{
  display: flex; gap: 28px; flex: 1; justify-content: center; align-items: center;
  order: 2;
}
.nav-links a{
  color: var(--text-dim); font-size: 14px; font-weight: 500;
  padding: 6px 2px; border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease;
}
.nav-links a:hover{ color: var(--text); text-decoration: none; }
.nav-links a.active{ color: var(--accent); border-bottom-color: var(--accent); }

/* Desktop flex order: logo, links, signin, pic */
.navbar .auth-btn{ order: 3; }
.navbar .profile-pic-link{ order: 4; }
.navbar .nav-toggle{ order: 5; }

.profile-pic-link{ flex-shrink: 0; line-height: 0; }
.profile-pic{
  width: 38px; height: 38px; border-radius: 50%;
  border: 2px solid var(--border-strong);
  transition: border-color .15s ease, transform .15s ease;
}
.profile-pic-link:hover .profile-pic{ border-color: var(--accent); transform: scale(1.05); }

.status-bar{
  font-family: var(--font-mono); font-size: 12px; color: var(--text-faint);
  border-top: 1px solid var(--border);
  padding: 7px 24px; text-align: center;
  letter-spacing: 0.04em;
  background: rgba(255,255,255,0.015);
}
.status-bar span{ color: var(--amber); }

.nav-toggle{ display: none; }

/* ---------- mobile nav ---------- */

/* Legacy: pages without hamburger keep the old scroll row */
@media (max-width: 760px){
  .navbar:not(.with-hamburger){
    flex-wrap: wrap;
    padding: 12px 16px;
    gap: 8px;
  }
  .navbar:not(.with-hamburger) .profile-pic-link{ display: none; }
  .navbar:not(.with-hamburger) .nav-links{
    order: 3;
    flex: 0 0 100%;
    width: 100%;
    justify-content: flex-start;
    gap: 16px;
    overflow-x: auto;
    padding: 8px 0 2px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .navbar:not(.with-hamburger) .nav-links::-webkit-scrollbar{ display: none; }
  .navbar:not(.with-hamburger) .nav-links a{
    font-size: 13px;
    white-space: nowrap;
    padding: 4px 2px;
  }
  .navbar:not(.with-hamburger) .auth-btn{
    min-width: auto;
    padding: 6px 12px;
    font-size: 12px;
    white-space: nowrap;
    order: 2;
  }
  .navbar:not(.with-hamburger) .logo{ order: 1; }
}

/* Hamburger layout */
@media (max-width: 760px){
  .navbar.with-hamburger{
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "logo auth"
      "toggle toggle"
      "links links";
    padding: 12px 16px;
    gap: 0;
  }
  .navbar.with-hamburger .logo{ grid-area: logo; align-self: center; order: initial; }
  .navbar.with-hamburger .auth-btn{
    grid-area: auth;
    align-self: center;
    min-width: auto;
    padding: 6px 12px;
    font-size: 12px;
    order: initial;
  }
  .navbar.with-hamburger .profile-pic-link{ display: none; order: initial; }
  .navbar.with-hamburger .nav-toggle{
    grid-area: toggle;
    display: flex;
    justify-self: start;
    width: 40px;
    height: 34px;
    margin-top: 10px;
    padding: 8px 7px;
    background: transparent;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    cursor: pointer;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color .15s ease;
    order: initial;
  }
  .navbar.with-hamburger .nav-toggle span{
    display: block;
    height: 2px;
    background: var(--text-dim);
    border-radius: 2px;
    transition: all .2s ease;
  }
  .navbar.with-hamburger .nav-toggle:hover{ border-color: var(--accent); }
  .navbar.with-hamburger .nav-toggle:hover span{ background: var(--accent); }
  .navbar.with-hamburger .nav-toggle.open span:nth-child(1){ transform: translateY(8px) rotate(45deg); }
  .navbar.with-hamburger .nav-toggle.open span:nth-child(2){ opacity: 0; }
  .navbar.with-hamburger .nav-toggle.open span:nth-child(3){ transform: translateY(-8px) rotate(-45deg); }

  .navbar.with-hamburger .nav-links{
    grid-area: links;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    flex: none;
    width: 100%;
    padding: 0;
    margin-top: 10px;
    border-top: 1px solid var(--border);
    order: initial;
  }
  .navbar.with-hamburger .nav-links.open{ display: flex; }
  .navbar.with-hamburger .nav-links li{ display: block; }
  .navbar.with-hamburger .nav-links a{
    display: block;
    padding: 14px 10px;
    font-size: 15px;
    border-bottom: 1px solid var(--border);
    border-left: 3px solid transparent;
    white-space: normal;
  }
  .navbar.with-hamburger .nav-links a:hover{ text-decoration: none; color: var(--text); }
  .navbar.with-hamburger .nav-links a.active{
    color: var(--accent);
    border-left-color: var(--accent);
    border-bottom-color: var(--border);
  }
  .navbar.with-hamburger .nav-links li:last-child a{ border-bottom: none; }
}

/* ---------- buttons ---------- */
.btn{
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-body); font-weight: 600; font-size: 14px;
  padding: 11px 22px; border-radius: var(--radius-sm);
  background: var(--bg-card); color: var(--text);
  border: 1px solid var(--border-strong);
  cursor: pointer; transition: all .15s ease;
}
.btn:hover{ border-color: var(--accent); box-shadow: 0 0 18px var(--accent-glow); color: var(--accent); }
.btn:disabled{ opacity: 0.4; cursor: not-allowed; box-shadow: none; }
.btn-primary{ background: var(--accent); color: #06110d; border-color: var(--accent); }
.btn-primary:hover{ color: #06110d; filter: brightness(1.1); box-shadow: 0 0 22px var(--accent-glow); }
.btn-amber{ border-color: var(--amber); color: var(--amber); }
.btn-amber:hover{ box-shadow: 0 0 18px var(--amber-glow); color: var(--amber); }
.btn-danger{ border-color: var(--danger); color: var(--danger); }
.btn-sm{ padding: 7px 14px; font-size: 13px; }
.btn-row{ display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- hero ---------- */
.hero{ padding: 90px 24px 60px; text-align: center; }
.hero h1{
  font-size: clamp(42px, 8vw, 84px); margin-bottom: 14px;
  letter-spacing: -0.02em;
  background: linear-gradient(180deg, var(--text) 30%, var(--text-dim));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .subhead{
  font-family: var(--font-mono); color: var(--text-dim); font-size: 15px;
  letter-spacing: 0.02em;
}
.page-header{ padding: 64px 24px 32px; text-align: center; border-bottom: 1px solid var(--border); }
.page-header h1{ font-size: clamp(32px, 6vw, 52px); }
.page-header .subhead{ font-family: var(--font-mono); color: var(--text-dim); font-size: 14px; }

/* ---------- stat cards ---------- */
.stats-row{
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px;
  max-width: var(--maxw); margin: 0 auto 48px; padding: 0 24px;
}
@media (max-width: 900px){ .stats-row{ grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 480px){ .stats-row{ grid-template-columns: repeat(2, 1fr); } }
.stat-card{
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 14px; text-align: center;
  transition: border-color .15s ease;
}
.stat-card:hover{ border-color: var(--border-strong); }
.stat-emoji{ font-size: 22px; display: block; margin-bottom: 8px; }
.stat-num{ font-family: var(--font-mono); font-size: 26px; font-weight: 700; }
.stat-label{ font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.08em; margin-top: 4px; }
.stat-card.heart .stat-num{ color: var(--heart); }
.stat-card.diamond .stat-num{ color: var(--diamond); }
.stat-card.spade .stat-num{ color: var(--spade); }
.stat-card.crown .stat-num{ color: var(--crown); }
.stat-card.streak .stat-num{ color: var(--amber); }
.stat-card.score{ border-color: var(--accent); background: linear-gradient(180deg, rgba(0,212,170,0.08), transparent); }
.stat-card.score .stat-num{ color: var(--accent); }

/* ---------- section / cards ---------- */
section{ padding: 48px 24px; max-width: var(--maxw); margin: 0 auto; }
.section-head{ margin-bottom: 28px; }
.section-head h2{ font-size: 28px; }
.card{
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.card:hover{ border-color: var(--border-strong); }

.grid{ display: grid; gap: 16px; }
.grid-2{ grid-template-columns: repeat(2, 1fr); }
.grid-3{ grid-template-columns: repeat(3, 1fr); }
.grid-4{ grid-template-columns: repeat(4, 1fr); }
.grid-5{ grid-template-columns: repeat(5, 1fr); }
@media (max-width: 900px){ .grid-3, .grid-4, .grid-5{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px){ .grid-2, .grid-3, .grid-4, .grid-5{ grid-template-columns: 1fr; } }

.topic-box{
  cursor: pointer; text-align: center; padding: 30px 16px;
  font-family: var(--font-display); font-weight: 600; font-size: 17px;
}
.topic-box:hover{ border-color: var(--accent); box-shadow: 0 0 20px var(--accent-glow); }
.topic-box.open{ border-color: var(--accent); }

.chapter-list{ display: none; margin-top: 16px; }
.chapter-list.show{ display: grid; gap: 12px; }
.chapter-card{
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap;
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px 18px;
}
.chapter-card .chapter-name{ font-weight: 600; font-size: 14px; }

/* ---------- roulette ---------- */
.roulette-controls{
  display: flex; gap: 14px; flex-wrap: wrap; align-items: center;
  margin-bottom: 22px;
}
select{
  background: var(--bg-card); color: var(--text);
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: 10px 14px; font-size: 14px;
}
.roulette-result{
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  padding: 32px; min-height: 140px; position: relative; overflow: hidden;
}
.roulette-result.spinning::before{
  content: ''; position: absolute; inset: 0;
  background: conic-gradient(from 0deg, var(--accent), transparent 40%, var(--amber), transparent 80%);
  opacity: 0.15; animation: spin 0.9s linear infinite;
}
.roulette-placeholder{ color: var(--text-faint); text-align: center; font-family: var(--font-mono); }
.tag-row{ display: flex; gap: 8px; margin-bottom: 16px; }
.tag{
  font-family: var(--font-mono); font-size: 11px; padding: 4px 10px;
  border-radius: 20px; border: 1px solid var(--border-strong); color: var(--text-dim);
}
.tag.difficulty-Easy{ color: var(--success); border-color: var(--success); }
.tag.difficulty-Medium{ color: var(--amber); border-color: var(--amber); }
.tag.difficulty-Hard{ color: var(--diamond); border-color: var(--diamond); }
.tag.difficulty-IMO{ color: var(--spade); border-color: var(--spade); }
.problem-name{ font-family: var(--font-display); font-size: 18px; margin-bottom: 10px; }
.problem-text{ font-size: 15px; color: var(--text); }

/* ---------- daily problem ---------- */
.daily-card{ border-color: var(--amber); position: relative; }
.countdown{ font-family: var(--font-mono); color: var(--amber); font-size: 13px; margin-bottom: 18px; }

/* ---------- vault / enigma ---------- */
.vault-table{ width: 100%; border-collapse: collapse; margin-top: 8px; }
.vault-table th{
  text-align: left; font-family: var(--font-mono); font-size: 12px;
  color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.06em;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
}
.vault-row{ cursor: pointer; transition: background .15s ease; }
.vault-row:hover{ background: rgba(255,255,255,0.03); }
.vault-row td{ padding: 18px 16px; border-bottom: 1px solid var(--border); font-family: var(--font-mono); font-size: 14px; }
.vault-status{ font-weight: 700; letter-spacing: 0.05em; font-size: 12px; }
.vault-status.locked{ color: var(--danger); }
.vault-status.unlocked{ color: var(--success); }
.vault-reward{ color: var(--crown); }

.puzzle-panel{
  display: none; margin-top: 20px; padding: 28px;
  background: var(--bg-elevated); border: 1px solid var(--amber);
  border-radius: var(--radius-lg); font-family: var(--font-mono);
}
.puzzle-panel.show{ display: block; }
.puzzle-riddle{
  color: var(--amber); font-size: 15px; line-height: 1.8;
  border-left: 2px solid var(--amber); padding-left: 18px; margin-bottom: 24px;
}
.hint-box{
  margin-top: 10px; padding: 12px 16px; border-radius: var(--radius-sm);
  background: rgba(255,176,0,0.06); border: 1px solid var(--amber-dim);
  font-size: 13px; color: var(--amber); display: none;
}
.hint-box.show{ display: block; }
.code-entry{ display: flex; gap: 10px; margin-top: 22px; flex-wrap: wrap; }
.code-entry input{
  background: var(--bg); border: 1px solid var(--border-strong);
  color: var(--amber); font-family: var(--font-mono); font-size: 18px;
  letter-spacing: 0.3em; padding: 12px 16px; border-radius: var(--radius-sm);
  width: 220px;
}
.vault-message{ margin-top: 16px; font-size: 14px; }
.vault-message.error{ color: var(--danger); }
.vault-message.success{ color: var(--success); }
.vault-reward-panel{
  display: none; margin-top: 22px; padding: 20px; border-radius: var(--radius);
  background: rgba(0,255,136,0.05); border: 1px solid var(--success);
}
.vault-reward-panel.show{ display: block; }

.terminal-screen{
  background: #0a0a0f; color: #e6e6e6; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  text-align: center; padding: 24px;
}
.terminal-screen .blink{ animation: blink 1s step-end infinite; }

footer{
  border-top: 1px solid var(--border); padding: 36px 24px;
  text-align: center; font-family: var(--font-mono);
  font-size: 12px; color: var(--text-faint);
}

.hidden{ display: none !important; }
.center{ text-align: center; }
.mt-24{ margin-top: 24px; }
.mt-40{ margin-top: 40px; }

.confetti-piece{
  position: fixed; top: -10px; width: 8px; height: 14px; opacity: 0.9;
  animation: fall linear forwards; z-index: 999; pointer-events: none;
}

@keyframes blink{ 50%{ opacity: 0; } }
@keyframes spin{ to{ transform: rotate(360deg); } }
@keyframes fall{
  to{ transform: translateY(105vh) rotate(360deg); opacity: 0.4; }
}
@keyframes typewriter{ from{ width: 0; } to{ width: 100%; } }
.typewriter{
  overflow: hidden; white-space: nowrap; border-right: 2px solid var(--amber);
  animation: typewriter 1.6s steps(40) forwards, blink 0.8s step-end infinite;
}

mjx-container{ color: var(--text) !important; }
mjx-container svg{ fill: var(--text) !important; stroke: var(--text) !important; }
.MathJax{ color: var(--text) !important; }

.reward-statement{
  max-height: 220px;
  overflow-y: auto;
  background: rgba(0,0,0,0.35);
  padding: 16px;
  border-radius: var(--radius);
  margin: 12px 0;
  font-size: 0.95rem;
  line-height: 1.6;
  border: 1px solid var(--border);
  color: var(--text);
  font-family: var(--font-mono);
}
.reward-statement::-webkit-scrollbar{ width: 6px; }
.reward-statement::-webkit-scrollbar-track{ background: transparent; }
.reward-statement::-webkit-scrollbar-thumb{
  background: var(--border-strong);
  border-radius: 3px;
}

.auth-btn{
  background: transparent;
  border: 1px solid var(--border-strong);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all .15s ease;
  min-width: 110px;
  text-align: center;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.auth-btn:hover{
  border-color: var(--accent);
  color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
}
.auth-btn:disabled{
  opacity: 0.6;
  cursor: wait;
}
.auth-btn.signed-in{
  color: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 14px var(--amber-glow);
}

/* =========================================================
   MY LORES: nav item only in mobile hamburger, button hidden
   on mobile because hamburger already provides the link.
   ========================================================= */

/* Nav item: hidden by default (desktop / iPad), shown only in mobile hamburger. */
.nav-links .my-lores-nav { display: none; }

@media (max-width: 760px) {
  .navbar.with-hamburger .nav-links .my-lores-nav { display: block; }
  /* MY LORES header button is redundant on mobile since hamburger has it. */
  .my-lores-btn { display: none !important; }
}