/* ===== VARIABLES & RESET ===== */
:root {
  --bg-primary:    #0a0c10;
  --bg-secondary:  #0f1318;
  --bg-tertiary:   #161b23;
  --bg-card:       #131720;
  --border:        #1e2530;
  --border-subtle: #161c26;
  --text-primary:  #e2e8f0;
  --text-secondary:#8892a4;
  --text-muted:    #4a5568;
  --accent:        #4f8ef7;
  --accent-dim:    rgba(79,142,247,0.12);
  --accent-hover:  #6ba3f8;
  --green:         #34d058;
  --green-dim:     rgba(52,208,88,0.12);
  --yellow:        #c9a227;
  --red:           #e5534b;
  --red-dim:       rgba(229,83,75,0.12);
  --orange:        #d4882a;
  --orange-dim:    rgba(212,136,42,0.12);
  --purple:        #a371f7;
  --purple-dim:    rgba(163,113,247,0.12);
  --easy:          #1abc9c;
  --easy-dim:      rgba(26,188,156,0.12);
  --medium:        #e6a817;
  --medium-dim:    rgba(230,168,23,0.12);
  --hard:          #e5534b;
  --hard-dim:      rgba(229,83,75,0.12);
  --radius-sm:     5px;
  --radius:        8px;
  --radius-lg:     12px;
  --radius-xl:     16px;
  --shadow-sm:     0 1px 3px rgba(0,0,0,0.3);
  --shadow:        0 4px 20px rgba(0,0,0,0.5);
  --shadow-lg:     0 8px 40px rgba(0,0,0,0.6);
  --transition:    0.18s ease;
  --font-mono:     'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'Courier New', monospace;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }
button { cursor: pointer; font-family: inherit; transition: all var(--transition); }
input, select, textarea { font-family: inherit; }
code { font-family: var(--font-mono); }

/* ===== NAVBAR ===== */
.navbar {
  position: sticky; top: 0; z-index: 200;
  height: 56px;
  background: rgba(10,12,16,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand {
  display: flex; align-items: center; gap: 9px;
  font-size: 1.05rem; font-weight: 700; letter-spacing: -0.02em;
  color: var(--text-primary);
}
.nav-logo {
  width: 28px; height: 28px;
  background: var(--accent);
  border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
}
.nav-logo svg { width: 16px; height: 16px; fill: #0a0c10; }
.nav-links { display: flex; align-items: center; gap: 2px; }
.nav-links a {
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem; font-weight: 500;
  letter-spacing: -0.01em;
}
.nav-links a:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.nav-links a.active { color: var(--text-primary); background: var(--bg-tertiary); }
.nav-actions { display: flex; align-items: center; gap: 0.6rem; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 0.42rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem; font-weight: 600;
  border: none; letter-spacing: -0.01em;
  white-space: nowrap;
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-tertiary); color: var(--text-primary); border-color: #2a3444; }
.btn-primary { background: var(--accent); color: #0a0c10; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-success { background: var(--green); color: #0a0c10; }
.btn-success:hover { background: #3de066; }
.btn-danger { background: var(--red); color: #fff; }
.btn-danger:hover { background: #f06b64; }
.btn-sm { padding: 0.28rem 0.7rem; font-size: 0.78rem; }
.btn-lg { padding: 0.65rem 1.5rem; font-size: 0.95rem; }

/* ===== BADGES ===== */
.badge {
  display: inline-flex; align-items: center;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.01em;
}
.badge-easy   { background: var(--easy-dim);   color: var(--easy); }
.badge-medium { background: var(--medium-dim); color: var(--medium); }
.badge-hard   { background: var(--hard-dim);   color: var(--hard); }
.badge-accepted { background: var(--green-dim);  color: var(--green); }
.badge-wrong    { background: var(--red-dim);    color: var(--red); }
.badge-runtime  { background: var(--orange-dim); color: var(--orange); }
.badge-tle      { background: var(--purple-dim); color: var(--purple); }

.tag {
  display: inline-flex; align-items: center;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.72rem; font-weight: 500;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  margin: 2px;
  transition: all var(--transition);
}
.tag:hover { background: var(--accent-dim); color: var(--accent); border-color: rgba(79,142,247,0.3); cursor: pointer; }

/* ===== FOOTER ===== */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 3rem 2rem 1.5rem;
  margin-top: 5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  max-width: 1200px; margin: 0 auto 2.5rem;
}
.footer-brand p { color: var(--text-secondary); font-size: 0.85rem; margin-top: 0.6rem; max-width: 240px; line-height: 1.7; }
.footer-col h4 { font-size: 0.78rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.85rem; }
.footer-col a { display: block; color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 0.45rem; }
.footer-col a:hover { color: var(--text-primary); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  max-width: 1200px; margin: 0 auto;
}

/* ===== HERO ===== */
.hero {
  padding: 6rem 2rem 5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(79,142,247,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.78rem; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid rgba(79,142,247,0.2);
  border-radius: 20px;
  padding: 0.25rem 0.85rem;
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: 1.25rem;
}
.hero h1 .gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--purple) 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px; margin: 0 auto 2.25rem;
  line-height: 1.75;
}
.hero-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ===== STATS BAR ===== */
.stats-bar {
  display: flex; justify-content: center;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stat-item {
  padding: 1.5rem 3.5rem;
  text-align: center;
  border-right: 1px solid var(--border);
}
.stat-item:last-child { border-right: none; }
.stat-item .num {
  font-size: 1.6rem; font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}
.stat-item .label { font-size: 0.75rem; color: var(--text-muted); margin-top: 3px; letter-spacing: 0.02em; }

/* ===== SECTION ===== */
.section { padding: 3rem 2rem; max-width: 1200px; margin: 0 auto; }
.section-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; }
.section-header h2 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; }

/* ===== CARDS ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: border-color var(--transition);
}
.card:hover { border-color: #2a3444; }
.card-interactive:hover { border-color: rgba(79,142,247,0.35); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); gap: 1rem; }

/* ===== DAILY CHALLENGE ===== */
.daily-challenge {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem 2rem;
  display: flex; align-items: center; justify-content: space-between; gap: 2rem;
  flex-wrap: wrap;
  position: relative; overflow: hidden;
}
.daily-challenge::before {
  content: '';
  position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: linear-gradient(180deg, var(--accent), var(--purple));
}
.daily-challenge .dc-label {
  font-size: 0.72rem; font-weight: 700;
  color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}
.daily-challenge h3 { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.3rem; }
.daily-challenge p { color: var(--text-secondary); font-size: 0.875rem; }
.daily-challenge .dc-right { text-align: right; flex-shrink: 0; }
.daily-challenge .dc-timer { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.5rem; }

/* ===== STREAK ===== */
.streak-pill {
  display: inline-flex; align-items: center; gap: 5px;
  background: var(--orange-dim);
  border: 1px solid rgba(212,136,42,0.25);
  border-radius: 20px;
  padding: 0.25rem 0.75rem;
  color: var(--orange);
  font-weight: 600; font-size: 0.78rem;
  letter-spacing: 0.01em;
}
.streak-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--orange);
}

/* ===== PROBLEMS TABLE ===== */
.problems-page { max-width: 1200px; margin: 0 auto; padding: 2rem; }
.page-title { font-size: 1.35rem; font-weight: 800; letter-spacing: -0.03em; }
.page-subtitle { color: var(--text-muted); font-size: 0.82rem; margin-top: 3px; }

.filters-bar {
  display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center;
  margin-bottom: 1.25rem;
  padding: 0.85rem 1rem;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.search-wrap { position: relative; flex: 1; min-width: 200px; }
.search-icon {
  position: absolute; left: 0.75rem; top: 50%; transform: translateY(-50%);
  color: var(--text-muted); pointer-events: none;
}
.search-input {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.45rem 0.9rem 0.45rem 2.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}
.search-input::placeholder { color: var(--text-muted); }
.search-input:focus { outline: none; border-color: rgba(79,142,247,0.5); background: var(--bg-card); }

.filter-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  cursor: pointer;
}
.filter-select:focus { outline: none; border-color: rgba(79,142,247,0.5); }

.problems-table { width: 100%; border-collapse: collapse; }
.problems-table th {
  text-align: left;
  padding: 0.65rem 1rem;
  font-size: 0.72rem; font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.07em;
  border-bottom: 1px solid var(--border);
}
.problems-table td {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  font-size: 0.875rem;
  vertical-align: middle;
}
.problems-table tbody tr { transition: background var(--transition); }
.problems-table tbody tr:hover td { background: var(--bg-secondary); }
.problems-table tbody tr:last-child td { border-bottom: none; }
.problem-title-link { color: var(--text-primary); font-weight: 500; letter-spacing: -0.01em; }
.problem-title-link:hover { color: var(--accent); }
.status-check { color: var(--green); font-size: 0.85rem; }
.status-dash { color: var(--text-muted); font-size: 0.85rem; }
.status-partial { color: var(--yellow); font-size: 0.85rem; }
.acceptance-rate { color: var(--text-secondary); font-size: 0.82rem; font-variant-numeric: tabular-nums; }

.pagination { display: flex; align-items: center; justify-content: center; gap: 4px; margin-top: 2rem; }
.page-btn {
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.82rem; font-weight: 500;
}
.page-btn:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.page-btn.active { background: var(--accent); color: #0a0c10; border-color: var(--accent); font-weight: 700; }

/* ===== PROBLEM DETAIL ===== */
.problem-topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1rem; height: 48px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.problem-layout {
  display: grid; grid-template-columns: 1fr 1fr;
  height: calc(100vh - 48px); overflow: hidden;
}
.problem-left { overflow-y: auto; border-right: 1px solid var(--border); }
.problem-right { display: flex; flex-direction: column; overflow: hidden; background: var(--bg-primary); }

.problem-tabs {
  display: flex;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 0.25rem;
}
.tab-btn {
  padding: 0.7rem 1rem;
  background: none; border: none;
  color: var(--text-muted);
  font-size: 0.82rem; font-weight: 500;
  border-bottom: 2px solid transparent;
  letter-spacing: -0.01em;
}
.tab-btn:hover { color: var(--text-secondary); }
.tab-btn.active { color: var(--text-primary); border-bottom-color: var(--accent); }
.tab-content { display: none; }
.tab-content.active { display: block; }

.problem-header { padding: 1.5rem 1.5rem 1.25rem; border-bottom: 1px solid var(--border); }
.problem-header h1 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.6rem; }
.problem-meta { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.problem-body { padding: 1.5rem; }
.problem-body p { color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.75; font-size: 0.9rem; }

.example-block {
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  margin-bottom: 0.85rem;
  border: 1px solid var(--border);
}
.example-block .ex-label { font-size: 0.72rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 0.5rem; }
.example-block code { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text-primary); line-height: 1.7; display: block; }

.constraints-list { list-style: none; }
.constraints-list li {
  padding: 0.25rem 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
  display: flex; align-items: baseline; gap: 0.5rem;
}
.constraints-list li::before { content: '—'; color: var(--border); flex-shrink: 0; }

/* ===== CODE EDITOR ===== */
.editor-toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.6rem 0.85rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.lang-select {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem; font-weight: 500;
}
.editor-area { flex: 1; position: relative; overflow: hidden; }
.code-editor {
  width: 100%; height: 100%;
  background: var(--bg-primary);
  color: #cdd9e5;
  font-family: var(--font-mono);
  font-size: 0.82rem; line-height: 1.65;
  padding: 1rem 1.1rem;
  border: none; resize: none; outline: none;
  tab-size: 4;
}
.editor-footer {
  padding: 0.6rem 0.85rem;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 0.6rem;
  flex-shrink: 0;
}
.console-panel {
  height: 190px;
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  display: flex; flex-direction: column;
  flex-shrink: 0;
}
.console-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.45rem 0.85rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 0.75rem; font-weight: 600; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.06em;
}
.console-output {
  flex: 1; padding: 0.75rem 1rem;
  font-family: var(--font-mono); font-size: 0.78rem;
  color: var(--text-secondary); overflow-y: auto; line-height: 1.6;
}
.console-output .out-success { color: var(--green); }
.console-output .out-error   { color: var(--red); }
.console-output .out-info    { color: var(--text-muted); }

/* ===== AI HINT ===== */
.ai-hint-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 0.3rem 0.75rem;
  background: var(--purple-dim);
  border: 1px solid rgba(163,113,247,0.25);
  border-radius: var(--radius-sm);
  color: var(--purple);
  font-size: 0.78rem; font-weight: 600;
}
.ai-hint-btn:hover { background: rgba(163,113,247,0.2); }
.ai-hint-panel {
  position: absolute; bottom: 56px; right: 0.85rem;
  width: 300px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem;
  box-shadow: var(--shadow-lg);
  z-index: 50; display: none;
}
.ai-hint-panel.open { display: block; }
.ai-hint-panel h4 { font-size: 0.82rem; font-weight: 700; margin-bottom: 0.6rem; color: var(--purple); letter-spacing: -0.01em; }
.ai-hint-panel p { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.65; }
.ai-hint-panel .hint-actions { display: flex; gap: 0.5rem; margin-top: 0.85rem; }
.ai-hint-panel .hint-note { font-size: 0.7rem; color: var(--text-muted); margin-top: 0.6rem; }

/* ===== SUBMISSIONS ===== */
.submissions-page { max-width: 1200px; margin: 0 auto; padding: 2rem; }
.submissions-table { width: 100%; border-collapse: collapse; }
.submissions-table th {
  text-align: left; padding: 0.65rem 1rem;
  font-size: 0.72rem; font-weight: 700; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.07em;
  border-bottom: 1px solid var(--border);
}
.submissions-table td { padding: 0.8rem 1rem; border-bottom: 1px solid var(--border-subtle); font-size: 0.875rem; }
.submissions-table tbody tr:hover td { background: var(--bg-secondary); }
.submissions-table tbody tr:last-child td { border-bottom: none; }

/* ===== LEADERBOARD ===== */
.leaderboard-page { max-width: 860px; margin: 0 auto; padding: 2rem; }
.leaderboard-table { width: 100%; border-collapse: collapse; }
.leaderboard-table th {
  text-align: left; padding: 0.65rem 1rem;
  font-size: 0.72rem; font-weight: 700; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.07em;
  border-bottom: 1px solid var(--border);
}
.leaderboard-table td { padding: 0.85rem 1rem; border-bottom: 1px solid var(--border-subtle); font-size: 0.875rem; }
.leaderboard-table tbody tr:hover td { background: var(--bg-secondary); }
.leaderboard-table tbody tr:last-child td { border-bottom: none; }

.rank-num { font-size: 0.85rem; font-weight: 700; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.rank-gold   { color: #d4a017; }
.rank-silver { color: #9ba3af; }
.rank-bronze { color: #a0714f; }

.user-cell { display: flex; align-items: center; gap: 0.75rem; }
.avatar {
  width: 34px; height: 34px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.78rem; flex-shrink: 0;
}
.rating-display { display: flex; align-items: center; gap: 0.6rem; }
.rating-bar-track { width: 80px; height: 4px; background: var(--bg-tertiary); border-radius: 2px; overflow: hidden; }
.rating-bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--purple)); border-radius: 2px; }

/* ===== CONTESTS ===== */
.contests-page { max-width: 1100px; margin: 0 auto; padding: 2rem; }
.contest-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.5rem;
  transition: border-color var(--transition);
}
.contest-card:hover { border-color: #2a3444; }
.contest-name { font-size: 1rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 0.6rem; }
.contest-meta {
  display: flex; gap: 1.25rem;
  color: var(--text-secondary); font-size: 0.82rem;
  margin-bottom: 1rem; flex-wrap: wrap;
}
.contest-meta-item { display: flex; align-items: center; gap: 5px; }
.contest-meta-icon { color: var(--text-muted); font-size: 0.75rem; }
.contest-status-pill {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 0.18rem 0.6rem;
  border-radius: 4px;
  font-size: 0.72rem; font-weight: 600;
  margin-bottom: 0.6rem;
}
.pill-upcoming { background: var(--accent-dim);  color: var(--accent); }
.pill-ongoing  { background: var(--green-dim);   color: var(--green); }
.pill-past     { background: var(--bg-tertiary); color: var(--text-muted); }
.live-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); animation: blink 1.4s ease infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.3} }
.countdown-text { font-size: 0.9rem; font-weight: 700; color: var(--text-primary); font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }

/* ===== DASHBOARD ===== */
.dashboard-page { max-width: 1200px; margin: 0 auto; padding: 2rem; }
.dashboard-grid { display: grid; grid-template-columns: 280px 1fr; gap: 1.25rem; }
.profile-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-align: center;
}
.profile-avatar-lg {
  width: 72px; height: 72px; border-radius: 50%;
  margin: 0 auto 0.85rem;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  color: #0a0c10;
}
.profile-card .p-name { font-size: 1rem; font-weight: 700; letter-spacing: -0.02em; }
.profile-card .p-handle { color: var(--text-muted); font-size: 0.8rem; margin-bottom: 1rem; }
.solved-breakdown {
  display: flex; justify-content: space-around;
  margin: 1rem 0; padding: 1rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.solved-item .s-count { font-size: 1.3rem; font-weight: 800; letter-spacing: -0.03em; }
.solved-item .s-diff  { font-size: 0.7rem; font-weight: 600; margin-top: 1px; }
.solved-easy   .s-count { color: var(--easy); }
.solved-medium .s-count { color: var(--medium); }
.solved-hard   .s-count { color: var(--hard); }
.solved-easy   .s-diff  { color: var(--easy); }
.solved-medium .s-diff  { color: var(--medium); }
.solved-hard   .s-diff  { color: var(--hard); }

.progress-ring { position: relative; display: inline-flex; align-items: center; justify-content: center; }
.progress-ring svg { transform: rotate(-90deg); }
.ring-text { position: absolute; text-align: center; }
.ring-text .r-num   { font-size: 1.4rem; font-weight: 800; letter-spacing: -0.03em; }
.ring-text .r-label { font-size: 0.68rem; color: var(--text-muted); }

.stats-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-bottom: 1.25rem; }
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.4rem;
}
.stat-card .sc-num   { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.03em; }
.stat-card .sc-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 3px; }
.stat-card .sc-sub   { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.5rem; }

.heatmap { display: grid; grid-template-columns: repeat(52, 1fr); gap: 3px; }
.heatmap-cell { width: 100%; aspect-ratio: 1; border-radius: 2px; background: var(--bg-tertiary); }
.heatmap-cell.l1 { background: rgba(52,208,88,0.25); }
.heatmap-cell.l2 { background: rgba(52,208,88,0.5); }
.heatmap-cell.l3 { background: rgba(52,208,88,0.75); }
.heatmap-cell.l4 { background: var(--green); }

.mini-chart { display: flex; align-items: flex-end; gap: 3px; height: 48px; }
.mini-chart .bar { flex: 1; background: var(--accent); border-radius: 2px 2px 0 0; opacity: 0.6; transition: opacity var(--transition); }
.mini-chart .bar:hover { opacity: 1; }

/* ===== PROFILE PAGE ===== */
.profile-page { max-width: 980px; margin: 0 auto; padding: 2rem; }
.profile-banner {
  height: 140px;
  background: linear-gradient(135deg, rgba(79,142,247,0.12) 0%, rgba(163,113,247,0.12) 100%);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  border: 1px solid var(--border); border-bottom: none;
}
.profile-info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  padding: 0 1.5rem 1.5rem;
  margin-bottom: 1.25rem;
}
.profile-avatar-wrap { margin-top: -36px; margin-bottom: 0.75rem; }
.profile-avatar-xl {
  width: 72px; height: 72px; border-radius: 50%;
  border: 3px solid var(--bg-primary);
  background: linear-gradient(135deg, var(--accent), var(--purple));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.75rem; font-weight: 800; color: #0a0c10;
}
.badges-grid { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.badge-item {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  text-align: center; min-width: 80px;
}
.badge-item .bi-icon { font-size: 1.25rem; margin-bottom: 0.2rem; }
.badge-item .bi-name { font-size: 0.7rem; color: var(--text-secondary); }

/* ===== AUTH ===== */
.auth-page {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 2rem;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, rgba(79,142,247,0.05) 0%, transparent 60%);
}
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 2.25rem;
  width: 100%; max-width: 400px;
}
.auth-logo {
  width: 44px; height: 44px;
  background: var(--accent);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 1.25rem;
}
.auth-logo svg { width: 22px; height: 22px; fill: #0a0c10; }
.auth-card h1 { font-size: 1.35rem; font-weight: 800; letter-spacing: -0.03em; text-align: center; }
.auth-card .auth-sub { color: var(--text-secondary); font-size: 0.85rem; text-align: center; margin-bottom: 1.75rem; margin-top: 0.25rem; }
.form-group { margin-bottom: 1.1rem; }
.form-label { display: block; font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.35rem; }
.form-input {
  width: 100%;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}
.form-input:focus { outline: none; border-color: rgba(79,142,247,0.5); box-shadow: 0 0 0 3px rgba(79,142,247,0.08); }
.form-footer { text-align: center; margin-top: 1.1rem; font-size: 0.82rem; color: var(--text-secondary); }
.divider { display: flex; align-items: center; gap: 0.85rem; margin: 1.1rem 0; color: var(--text-muted); font-size: 0.75rem; }
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--border); }

/* ===== DISCUSSION ===== */
.comment {
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1rem;
  margin-bottom: 0.6rem;
  border: 1px solid var(--border);
}
.comment-header { display: flex; align-items: center; gap: 0.65rem; margin-bottom: 0.45rem; }
.comment-body { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.65; }
.comment-actions { display: flex; gap: 1rem; margin-top: 0.5rem; }
.comment-actions button { background: none; border: none; color: var(--text-muted); font-size: 0.78rem; display: flex; align-items: center; gap: 4px; }
.comment-actions button:hover { color: var(--accent); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .problem-layout { grid-template-columns: 1fr; height: auto; }
  .problem-left { border-right: none; border-bottom: 1px solid var(--border); }
  .dashboard-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stats-bar { flex-wrap: wrap; }
  .stat-item { border-right: none; border-bottom: 1px solid var(--border); flex: 1 1 140px; }
  .stats-cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .navbar { padding: 0 1rem; }
  .nav-links { display: none; }
  .section { padding: 2rem 1rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .stats-cards { grid-template-columns: 1fr; }
  .hero { padding: 4rem 1.25rem 3rem; }
}