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

:root {
  --bg:        #0d1117;
  --bg2:       #161b22;
  --bg3:       #1c2128;
  --bg4:       #22272e;
  --border:    #30363d;
  --border2:   #3d444d;
  --text:      #e6edf3;
  --text2:     #adbac7;
  --text3:     #6e7681;
  --green:     #3fb950;
  --green-dk:  #2ea043;
  --green-bg:  rgba(63,185,80,.12);
  --green-bdr: rgba(63,185,80,.3);
  --blue:      #58a6ff;
  --orange:    #d29922;
  --red:       #f85149;
  --yellow:    #e3b341;
  --purple:    #bc8cff;
  --r:         10px;
  --r-lg:      14px;
}

*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; }
body {
  font-family:'Inter',sans-serif;
  background:var(--bg);
  color:var(--text);
  min-height:100vh;
  display:flex;
  flex-direction:column;
  font-size:15px;
  line-height:1.6;
}

a { color:var(--green); text-decoration:none; }
a:hover { text-decoration:underline; }

/* ── Navbar ── */
.navbar {
  background:rgba(13,17,23,.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
  padding:.75rem 0;
  position:sticky; top:0; z-index:100;
}
.navbar-inner {
  max-width:1100px; margin:0 auto; padding:0 1.25rem;
  display:flex; align-items:center; gap:1rem;
}
.nav-brand {
  font-size:1.25rem; font-weight:800; color:var(--green) !important;
  text-decoration:none; display:flex; align-items:center; gap:.4rem;
  letter-spacing:-.5px; flex-shrink:0;
}
.nav-links { display:flex; align-items:center; gap:.25rem; flex:1; }
.nav-link {
  color:var(--text2) !important; text-decoration:none;
  padding:.4rem .75rem; border-radius:var(--r);
  font-size:.9rem; font-weight:500;
  display:flex; align-items:center; gap:.4rem;
  transition:background .15s, color .15s;
}
.nav-link:hover { background:var(--bg4); color:var(--text) !important; text-decoration:none; }
.nav-link.admin-link { color:var(--yellow) !important; }
.nav-right { display:flex; align-items:center; gap:.5rem; margin-left:auto; }
.nav-user-btn {
  display:flex; align-items:center; gap:.5rem;
  color:var(--text) !important; text-decoration:none;
  padding:.35rem .75rem; border-radius:var(--r);
  font-size:.875rem; font-weight:500;
  transition:background .15s;
}
.nav-user-btn:hover { background:var(--bg4); text-decoration:none; }
.nav-avatar {
  width:28px; height:28px; border-radius:50%;
  object-fit:cover; border:2px solid var(--green);
}
.nav-avatar-ph {
  width:28px; height:28px; border-radius:50%;
  background:var(--green); color:#000;
  display:flex; align-items:center; justify-content:center;
  font-size:.75rem; font-weight:700; flex-shrink:0;
}
.nav-hamburger { display:none; }

/* ── Buttons ── */
.btn {
  display:inline-flex; align-items:center; gap:.4rem;
  padding:.45rem 1rem; border-radius:var(--r);
  font-size:.875rem; font-weight:600; cursor:pointer;
  border:1px solid transparent; transition:all .15s;
  text-decoration:none; white-space:nowrap;
}
.btn-primary { background:var(--green); border-color:var(--green); color:#000 !important; }
.btn-primary:hover { background:var(--green-dk); text-decoration:none; }
.btn-outline { background:transparent; border-color:var(--border2); color:var(--text2) !important; }
.btn-outline:hover { background:var(--bg4); color:var(--text) !important; text-decoration:none; }
.btn-danger  { background:transparent; border-color:var(--red); color:var(--red) !important; }
.btn-danger:hover { background:rgba(248,81,73,.12); text-decoration:none; }
.btn-orange  { background:transparent; border-color:var(--orange); color:var(--orange) !important; }
.btn-orange:hover { background:rgba(210,153,34,.12); text-decoration:none; }
.btn-sm { padding:.3rem .7rem; font-size:.8rem; }
.btn-lg { padding:.65rem 1.5rem; font-size:1rem; }
.btn-block { width:100%; justify-content:center; }
.btn:disabled { opacity:.5; cursor:not-allowed; }

/* ── Container / Cards ── */
.container { max-width:1100px; margin:0 auto; padding:0 1.25rem; }
.card {
  background:var(--bg2); border:1px solid var(--border);
  border-radius:var(--r-lg); padding:1.5rem;
}
.card-sm { padding:1rem 1.25rem; }
.card-title {
  font-size:1rem; font-weight:700; color:var(--text);
  margin-bottom:1rem; display:flex; align-items:center; gap:.5rem;
}
.card-title svg { width:18px; height:18px; flex-shrink:0; }

/* ── Flash ── */
.flash-wrap { max-width:1100px; margin:.75rem auto; padding:0 1.25rem; }
.flash {
  padding:.75rem 1rem; border-radius:var(--r);
  border:1px solid; font-size:.9rem; font-weight:500;
  display:flex; align-items:center; gap:.5rem;
}
.flash-success { background:var(--green-bg); border-color:var(--green-bdr); color:#7ee787; }
.flash-danger  { background:rgba(248,81,73,.1); border-color:rgba(248,81,73,.3); color:#ff7b72; }
.flash-warning { background:rgba(210,153,34,.1); border-color:rgba(210,153,34,.3); color:#e3b341; }
.flash-info    { background:rgba(88,166,255,.1); border-color:rgba(88,166,255,.3); color:#79c0ff; }

/* ── Forms ── */
.form-group { margin-bottom:1rem; }
.form-label { display:block; font-size:.875rem; font-weight:600; color:var(--text2); margin-bottom:.4rem; }
.form-control {
  width:100%; background:var(--bg3); border:1px solid var(--border);
  color:var(--text) !important; border-radius:var(--r);
  padding:.5rem .75rem; font-size:.9rem; font-family:inherit;
  transition:border-color .15s;
  -webkit-appearance:none;
}
.form-control::placeholder { color:var(--text3); }
.form-control:focus { outline:none; border-color:var(--green); box-shadow:0 0 0 3px rgba(63,185,80,.2); }
select.form-control option { background:var(--bg3); color:var(--text); }
textarea.form-control { resize:vertical; min-height:80px; }
.form-row { display:grid; gap:1rem; }
.form-row-2 { grid-template-columns:1fr 1fr; }
.form-row-3 { grid-template-columns:1fr 1fr 1fr; }
.form-hint { font-size:.8rem; color:var(--text3); margin-top:.3rem; }
.input-group { display:flex; }
.input-group .form-control { border-radius:var(--r) 0 0 var(--r); }
.input-group .input-suffix {
  background:var(--bg3); border:1px solid var(--border); border-left:none;
  color:var(--text3); padding:.5rem .75rem; border-radius:0 var(--r) var(--r) 0;
  font-size:.875rem; white-space:nowrap; display:flex; align-items:center;
}

/* ── Tables ── */
.tbl { width:100%; border-collapse:collapse; }
.tbl th {
  text-align:left; padding:.65rem .75rem;
  font-size:.78rem; font-weight:600; color:var(--text3);
  text-transform:uppercase; letter-spacing:.5px;
  border-bottom:1px solid var(--border);
}
.tbl td { padding:.75rem; border-bottom:1px solid var(--border); vertical-align:middle; font-size:.9rem; }
.tbl tr:last-child td { border-bottom:none; }
.tbl tr:hover td { background:rgba(255,255,255,.02); }
.tbl-wrap { overflow-x:auto; }

/* ── Badges ── */
.badge {
  display:inline-flex; align-items:center; gap:.25rem;
  padding:.2rem .55rem; border-radius:999px;
  font-size:.75rem; font-weight:600;
}
.badge-green  { background:var(--green-bg); color:var(--green); border:1px solid var(--green-bdr); }
.badge-red    { background:rgba(248,81,73,.12); color:#ff7b72; border:1px solid rgba(248,81,73,.3); }
.badge-orange { background:rgba(210,153,34,.12); color:var(--orange); border:1px solid rgba(210,153,34,.3); }
.badge-blue   { background:rgba(88,166,255,.12); color:var(--blue); border:1px solid rgba(88,166,255,.3); }
.badge-gray   { background:var(--bg4); color:var(--text2); border:1px solid var(--border); }
.badge-purple { background:rgba(188,140,255,.12); color:var(--purple); border:1px solid rgba(188,140,255,.3); }

/* ── Session Cards (homepage) ── */
.session-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:1rem; }
.session-card {
  background:var(--bg2); border:1px solid var(--border);
  border-radius:var(--r-lg); padding:1.25rem;
  transition:border-color .2s, transform .15s;
  cursor:pointer; text-decoration:none; display:block; color:inherit;
}
.session-card:hover { border-color:var(--green); transform:translateY(-2px); text-decoration:none; color:inherit; }
.session-card.locked { opacity:.7; }
.session-card.cancelled { opacity:.5; }
.sc-day { font-size:.78rem; font-weight:600; color:var(--text3); text-transform:uppercase; letter-spacing:.5px; margin-bottom:.4rem; }
.sc-title { font-size:1.05rem; font-weight:700; color:var(--text); margin-bottom:.4rem; }
.sc-time { font-size:.9rem; color:var(--text2); display:flex; align-items:center; gap:.4rem; margin-bottom:.3rem; }
.sc-loc  { font-size:.85rem; color:var(--text3); display:flex; align-items:center; gap:.4rem; }
.sc-footer { margin-top:.85rem; padding-top:.85rem; border-top:1px solid var(--border); display:flex; align-items:center; justify-content:space-between; }
.sc-count { font-size:.85rem; color:var(--text2); display:flex; align-items:center; gap:.4rem; }
.sc-gender { display:flex; gap:.4rem; }

/* ── Week nav ── */
.week-nav { display:flex; align-items:center; justify-content:space-between; margin-bottom:1.5rem; flex-wrap:wrap; gap:.75rem; }
.week-label { font-size:1rem; font-weight:700; color:var(--text); }
.week-days  { display:flex; gap:.5rem; flex-wrap:wrap; }
.day-pill {
  padding:.25rem .7rem; border-radius:999px; font-size:.8rem; font-weight:600;
  background:var(--bg3); border:1px solid var(--border); color:var(--text2);
  cursor:default;
}
.day-pill.today { background:var(--green-bg); border-color:var(--green-bdr); color:var(--green); }
.day-pill.has-session { border-color:var(--border2); color:var(--text); }

/* ── Session detail ── */
.sd-hero {
  background:var(--bg2); border:1px solid var(--border);
  border-radius:var(--r-lg); padding:2rem; margin-bottom:1.5rem;
}
.sd-title { font-size:1.6rem; font-weight:800; color:var(--text); margin-bottom:.5rem; }
.sd-meta { display:flex; flex-wrap:wrap; gap:1rem; margin-bottom:1rem; }
.sd-meta-item { display:flex; align-items:center; gap:.4rem; font-size:.9rem; color:var(--text2); }
.sd-meta-item svg { width:16px; height:16px; flex-shrink:0; color:var(--text3); }

/* ── Participant list ── */
.participant-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(160px,1fr)); gap:.5rem; }
.participant-item {
  background:var(--bg3); border:1px solid var(--border); border-radius:var(--r);
  padding:.5rem .75rem; display:flex; align-items:center; gap:.5rem; font-size:.875rem;
}
.p-avatar {
  width:28px; height:28px; border-radius:50%; object-fit:cover;
  background:var(--green); color:#000; font-size:.7rem; font-weight:700;
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
}
.p-avatar img { width:28px; height:28px; border-radius:50%; object-fit:cover; }

/* ── Stats bar ── */
.stats-bar { display:flex; gap:1.5rem; flex-wrap:wrap; }
.stat-item { text-align:center; }
.stat-num  { font-size:1.6rem; font-weight:800; color:var(--text); line-height:1; }
.stat-lbl  { font-size:.75rem; color:var(--text3); margin-top:.15rem; }

/* ── Auth ── */
.auth-wrap { min-height:calc(100vh - 120px); display:flex; align-items:center; justify-content:center; padding:2rem 1rem; }
.auth-card { background:var(--bg2); border:1px solid var(--border); border-radius:var(--r-lg); padding:2rem; width:100%; max-width:420px; }
.auth-logo { font-size:2.5rem; text-align:center; margin-bottom:.5rem; }
.auth-title { font-size:1.5rem; font-weight:800; text-align:center; color:var(--text); margin-bottom:.25rem; }
.auth-sub   { font-size:.875rem; color:var(--text3); text-align:center; margin-bottom:1.5rem; }
.auth-divider { border:none; border-top:1px solid var(--border); margin:1.25rem 0; }

/* ── Profile ── */
.profile-grid { display:grid; grid-template-columns:260px 1fr; gap:1.5rem; align-items:start; }
.profile-sidebar { position:sticky; top:80px; }
.profile-avatar-wrap { text-align:center; margin-bottom:1rem; }
.profile-avatar {
  width:100px; height:100px; border-radius:50%; object-fit:cover;
  border:3px solid var(--green); margin-bottom:.75rem;
}
.profile-avatar-ph {
  width:100px; height:100px; border-radius:50%;
  background:var(--green); color:#000;
  display:flex; align-items:center; justify-content:center;
  font-size:2.5rem; font-weight:800; margin:0 auto .75rem;
}
.profile-name { font-size:1.15rem; font-weight:700; color:var(--text); }
.profile-user { font-size:.875rem; color:var(--text3); }
.profile-tabs { display:flex; gap:.25rem; border-bottom:1px solid var(--border); margin-bottom:1.5rem; }
.ptab {
  padding:.5rem 1rem; font-size:.875rem; font-weight:600; color:var(--text2);
  border-bottom:2px solid transparent; cursor:pointer; text-decoration:none;
  transition:color .15s;
}
.ptab:hover { color:var(--text); text-decoration:none; }
.ptab.active { color:var(--green); border-bottom-color:var(--green); }

/* ── Admin tabs ── */
.admin-tabs { display:flex; gap:.25rem; margin-bottom:1.5rem; flex-wrap:wrap; }
.atab {
  padding:.45rem .9rem; font-size:.875rem; font-weight:600;
  background:var(--bg3); border:1px solid var(--border); color:var(--text2);
  border-radius:var(--r); text-decoration:none; transition:all .15s;
}
.atab:hover { color:var(--text); text-decoration:none; background:var(--bg4); }
.atab.active { background:var(--green-bg); border-color:var(--green-bdr); color:var(--green); }

/* ── Expense ── */
.expense-row { display:flex; gap:1rem; align-items:flex-end; margin-bottom:.75rem; }
.expense-row .form-group { flex:1; margin-bottom:0; }

/* ── Payment ── */
.payment-item {
  display:flex; align-items:center; justify-content:space-between;
  padding:.75rem; border-bottom:1px solid var(--border); gap:.75rem;
}
.payment-item:last-child { border-bottom:none; }
.pay-user { display:flex; align-items:center; gap:.5rem; font-size:.9rem; font-weight:600; color:var(--text); }
.pay-amount { font-weight:700; color:var(--text); font-size:.95rem; }
.pay-status-paid   { color:var(--green); font-size:.8rem; font-weight:600; }
.pay-status-unpaid { color:var(--red);   font-size:.8rem; font-weight:600; }

/* ── Footer ── */
footer { margin-top:auto; border-top:1px solid var(--border); padding:1.25rem 0; text-align:center; font-size:.85rem; color:var(--text3); }

/* ── Utils ── */
.flex { display:flex; }
.flex-center { display:flex; align-items:center; }
.flex-between { display:flex; align-items:center; justify-content:space-between; }
.gap-1 { gap:.5rem; }
.gap-2 { gap:1rem; }
.mt-1 { margin-top:.5rem; }
.mt-2 { margin-top:1rem; }
.mt-3 { margin-top:1.5rem; }
.mb-1 { margin-bottom:.5rem; }
.mb-2 { margin-bottom:1rem; }
.mb-3 { margin-bottom:1.5rem; }
.pt-2 { padding-top:1rem; }
.text-sm { font-size:.85rem; }
.text-xs { font-size:.78rem; }
.text-muted { color:var(--text3); }
.text-green { color:var(--green); }
.text-red   { color:var(--red); }
.text-orange { color:var(--orange); }
.text-right { text-align:right; }
.fw-700 { font-weight:700; }
.fw-600 { font-weight:600; }
.page-title { font-size:1.5rem; font-weight:800; color:var(--text); margin-bottom:1.5rem; display:flex; align-items:center; gap:.6rem; }
.section-title { font-size:1rem; font-weight:700; color:var(--text); margin-bottom:.75rem; }
.empty-state { text-align:center; padding:3rem 1rem; color:var(--text3); }
.empty-icon  { font-size:2.5rem; margin-bottom:.5rem; }
.divider { border:none; border-top:1px solid var(--border); margin:1.5rem 0; }
.grid-2 { display:grid; grid-template-columns:1fr 1fr; gap:1rem; }
.grid-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:1rem; }
.grid-4 { display:grid; grid-template-columns:repeat(4,1fr); gap:1rem; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width:6px; height:6px; }
::-webkit-scrollbar-track { background:var(--bg); }
::-webkit-scrollbar-thumb { background:var(--border2); border-radius:3px; }

/* ── Responsive ── */
@media(max-width:768px){
  .profile-grid { grid-template-columns:1fr; }
  .profile-sidebar { position:static; }
  .form-row-2,.form-row-3 { grid-template-columns:1fr; }
  .grid-2,.grid-3,.grid-4 { grid-template-columns:1fr; }
  .nav-links { display:none; }
  .nav-hamburger { display:flex; }
  .session-grid { grid-template-columns:1fr; }
}
@media (max-width: 768px) {
  .brand-text { display: none !important; }
}