*,*::before,*::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #060810; --s1: #0d1020; --s2: #131826; --s3: #191f30;
  --b1: rgba(148, 163, 184, .08); --b2: rgba(148, 163, 184, .15); --b3: rgba(148, 163, 184, .25);
  --blue: #5b9cf6; --bdim: rgba(91, 156, 246, .1); --bbd: rgba(91, 156, 246, .2);
  --green: #46d39a; --gdim: rgba(70, 211, 154, .1);
  --pink: #e879a0; --pdim: rgba(232, 121, 160, .1);
  --amber: #f0ac49; --adim: rgba(240, 172, 73, .1);
  --purple: #9d7ef8; --vdim: rgba(157, 126, 248, .1);
  --red: #f06060; --rdim: rgba(240, 96, 96, .1);
  --tx: #dde4f0; --tx2: #8896b0; --tx3: #4a5670; --r: 10px;
  --card: var(--s1); --input-bg: var(--s2);
}

html.light-mode,
html.light-mode body {
  --bg: #f8fafc; --s1: #ffffff; --s2: #f1f5f9; --s3: #e2e8f0;
  --b1: rgba(0, 0, 0, .05); --b2: rgba(0, 0, 0, .1); --b3: rgba(0, 0, 0, .15);
  --tx: #1e293b; --tx2: #475569; --tx3: #94a3b8;
  --card: #ffffff; --input-bg: #f1f5f9;
  --bdim: rgba(91, 156, 246, .08); --bbd: rgba(91, 156, 246, .15);
}

html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--tx); font-family: 'DM Sans', sans-serif; font-size: 14px; min-height: 100vh; overflow-x: hidden; }
input, select, textarea, button { font-family: inherit; font-size: inherit; outline: none; border: none; }
button { cursor: pointer; }

/* -- ANIMATIONS -- */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scaleIn { from { opacity: 0; transform: scale(.95); } to { opacity: 1; transform: scale(1); } }
@keyframes slideInLeft { from { opacity: 0; transform: translateX(-20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: .3; } }
.anim-fade { animation: fadeInUp .4s ease both; }
.anim-scale { animation: scaleIn .3s ease both; }

/* -- APP LAYOUT -- */
#app-screen { display: flex; min-height: 100vh; }
.sidebar {
  width: 214px; background: var(--s1); border-right: 1px solid var(--b1);
  display: flex; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0; z-index: 50;
  transition: background 0.3s, border-color 0.3s;
}
.brand { padding: 1.3rem 1.1rem 1rem; border-bottom: 1px solid var(--b1); }
.brand-name {
  font-family: 'Syne', sans-serif; font-weight: 800; font-size: .95rem;
  background: linear-gradient(135deg, var(--blue), var(--pink));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.brand-sub { font-size: 9px; letter-spacing: .15em; text-transform: uppercase; color: var(--tx3); margin-top: 1px; }

.nav { flex: 1; padding: .75rem .5rem; display: flex; flex-direction: column; gap: .14rem; overflow-y: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.sidebar-foot { padding: 1rem .5rem; border-top: 1px solid var(--b1); margin-top: auto; }
.nb {
  display: flex; align-items: center; gap: .6rem; padding: .56rem .8rem; border-radius: 8px;
  background: transparent; border: 1px solid transparent; color: var(--tx2); width: 100%;
  text-align: left; font-size: 13px; transition: all .18s; cursor: pointer; text-decoration: none;
}
.nb:hover { background: var(--s2); color: var(--tx); }
.nb.on { background: var(--bdim); border-color: var(--bbd); color: var(--blue); }
.nb .ic { font-size: 15px; width: 18px; text-align: center; flex-shrink: 0; }

.main { margin-left: 214px; flex: 1; display: flex; flex-direction: column; min-height: 100vh; width: calc(100% - 214px); }
.topbar {
  position: sticky; top: 0; z-index: 40; background: var(--topbar-bg, rgba(6, 8, 16, .88));
  backdrop-filter: blur(14px); border-bottom: 1px solid var(--b1);
  padding: .85rem 1.6rem; display: flex; align-items: center; justify-content: space-between;
}
html.light-mode .topbar { --topbar-bg: rgba(248, 250, 252, .92); }
.pg-title { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.1rem; letter-spacing: -.01em; }
.sync-badge { display: flex; align-items: center; gap: .35rem; font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--tx3); }
.sync-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); }
.content { padding: 1.6rem; flex: 1; }

/* -- CARDS -- */
.card { background: var(--card); border: 1px solid var(--b1); border-radius: var(--r); padding: 1.3rem; margin-bottom: 1.5rem; transition: background 0.3s, color 0.3s; }
.card-hd { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.1rem; }
.card-title { font-family: 'Syne', sans-serif; font-weight: 700; font-size: .88rem; }
.scard {
  background: var(--s1); border: 1px solid var(--b1); border-radius: var(--r); padding: 1.1rem;
  position: relative; overflow: hidden; transition: transform .2s, border-color .25s; cursor: default;
}
.scard:hover { transform: translateY(-2px); border-color: var(--b2); }
.scard::after { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--ac, var(--blue)); }
.slbl { font-size: 10px; letter-spacing: .13em; text-transform: uppercase; color: var(--tx3); margin-bottom: .4rem; }
.sval { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.65rem; line-height: 1; color: var(--ac, var(--blue)); }
.ssub { font-size: 11px; color: var(--tx2); margin-top: .28rem; }

/* -- LISTS -- */
.list { display: flex; flex-direction: column; gap: .4rem; }
.item {
  background: var(--s2); border: 1px solid var(--b1); border-radius: 8px; padding: .75rem .95rem;
  display: flex; align-items: center; gap: .7rem; transition: border-color .2s;
}
.item:hover { border-color: var(--b2); }
.ib { flex: 1; min-width: 0; transition: opacity 0.2s; }
.it { font-size: 13px; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: all 0.2s; }
.is { font-size: 11px; color: var(--tx2); margin-top: 1px; display: flex; flex-wrap: wrap; gap: .3rem; align-items: center; }
.done-t .it { text-decoration: line-through; opacity: 0.5; }
.done-t .is { opacity: 0.6; }

/* -- CHECKBOX -- */
.chk { width: 18px; height: 18px; border: 2px solid var(--b3); border-radius: 4px; display: flex; align-items: center; justify-content: center; cursor: pointer; text-decoration: none; color: transparent; transition: all 0.2s; flex-shrink: 0; font-size: 12px; font-weight: bold; }
.chk.dn { background: var(--blue); border-color: var(--blue); color: #060810; }
.chk:hover { border-color: var(--blue); }

/* -- BUTTONS & CHIPS -- */
.btn {
  display: inline-flex; align-items: center; gap: .4rem; padding: .55rem 1.1rem; border-radius: 8px;
  font-family: 'Syne', sans-serif; font-weight: 700; font-size: 11px; letter-spacing: .1em;
  text-transform: uppercase; transition: all .18s; border: 1px solid transparent; text-decoration: none;
}
.btn-primary { background: var(--blue); color: #060810; border-color: var(--blue); }
.btn-primary:hover { transform: translateY(-2px); background: #7ab0f8; box-shadow: 0 4px 16px rgba(91, 156, 246, .3); }
.btn-sm { padding: .3rem .65rem; font-size: 10px; }
.btn-full { width: 100%; justify-content: center; }
.bdg {
  display: inline-flex; align-items: center; padding: .17rem .5rem; border-radius: 100px;
  font-size: 9px; font-family: 'Syne', sans-serif; font-weight: 700; letter-spacing: .08em;
  text-transform: uppercase; border: 1px solid;
}
.bblue { background: var(--bdim); color: var(--blue); border-color: var(--bbd); }
.bred { background: var(--rdim); color: var(--red); border-color: rgba(240, 96, 96, .2); }
.bamber { background: var(--adim); color: var(--amber); border-color: rgba(240, 172, 73, .2); }
.badge-overdue { background: var(--red) !important; color: #fff !important; border: none !important; animation: pulse-red 2s infinite; }
@keyframes pulse-red {
    0% { box-shadow: 0 0 0 0 rgba(240, 96, 96, 0.5); }
    70% { box-shadow: 0 0 0 10px rgba(240, 96, 96, 0); }
    100% { box-shadow: 0 0 0 0 rgba(240, 96, 96, 0); }
}

/* -- PROGRESS -- */
.prog { height: 6px; background: var(--s3); border-radius: 3px; overflow: hidden; }
.pf { height: 100%; border-radius: 3px; transition: width .5s ease; }

/* -- WELCOME BANNER -- */
.welcome {
  background: linear-gradient(135deg, rgba(91, 156, 246, .08), rgba(232, 121, 160, .05));
  border: 1px solid rgba(91, 156, 246, .14); border-radius: 12px; padding: 1.4rem 1.8rem;
  margin-bottom: 1.5rem; display: flex; align-items: center; justify-content: space-between;
}
.welcome h2 { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.2rem; margin-bottom: .2rem; }
.welcome p { font-size: 12px; color: var(--tx2); }
.clock-v { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.5rem; color: var(--blue); text-align: right; }
.clock-d { font-size: 10px; color: var(--tx3); text-align: right; margin-top: 1px; }

.f-row { display: grid; gap: .75rem; }
.g2 { grid-template-columns: 1fr 1fr; }
.g4 { grid-template-columns: repeat(4, 1fr); }

@media(max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .main { margin-left: 0; width: 100%; }
  .g4 { grid-template-columns: 1fr 1fr; }
}

/* ── FORM ELEMENTS (Premium) ── */
.f { margin-bottom: .9rem; }
.f label { display: block; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--tx2); margin-bottom: .35rem; font-weight: 500; }
.f input, .f select, .f textarea { width: 100%; background: var(--s2); border: 1px solid var(--b2); border-radius: 8px; padding: .6rem .85rem; color: var(--tx); transition: border-color .2s; }
.f input:focus, .f select:focus, .f textarea:focus { border-color: rgba(91,156,246,.5); }
.f select option { background: var(--s2); }
.f textarea { resize: vertical; min-height: 80px; }

/* ── AUTH (Premium) ── */
.auth-card { 
    background: var(--s1); border: 1px solid var(--b2); border-radius: 16px; 
    padding: 2.4rem; width: 100%; max-width: 400px; box-shadow: 0 30px 80px rgba(0,0,0,.6); 
    position: relative; overflow: hidden; 
}
.auth-card::before { 
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; 
    background: linear-gradient(90deg, transparent, var(--blue), transparent); 
}
.auth-logo { 
    font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.6rem; text-align: center; 
    background: linear-gradient(135deg, var(--blue), var(--pink)); 
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; 
    margin-bottom: .2rem; 
}
.auth-sub { text-align: center; font-size: 11px; color: var(--tx3); letter-spacing: .14em; text-transform: uppercase; margin-bottom: 1.6rem; }

.tabs { display: flex; background: var(--s2); border-radius: 8px; padding: 3px; gap: 2px; margin-bottom: 1.4rem; }
.tab { 
    flex: 1; padding: .45rem; border-radius: 6px; background: transparent; color: var(--tx3); 
    font-size: 11px; letter-spacing: .1em; text-transform: uppercase; font-family: 'Syne', sans-serif; 
    font-weight: 700; transition: all .2s; border: none; text-align: center; text-decoration: none; 
}
.tab.on { background: var(--s3); color: var(--blue); }
.auth-footer { text-align: center; font-size: 12px; color: var(--tx3); margin-top: .9rem; }
.auth-footer span { color: var(--blue); cursor: pointer; }

/* ── CALCULATOR ── */
.calc-screen { background: var(--s3); border-radius: 12px; padding: 1.2rem; margin-bottom: .8rem; text-align: right; }
.calc-expr { font-size: 12px; color: var(--tx3); min-height: 18px; margin-bottom: .3rem; }
.calc-result { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 2.2rem; color: var(--tx); word-break: break-all; }
.calc-grid { display: grid; grid-template-columns: repeat(4, 1fr) !important; gap: .6rem; padding: .5rem; }
.calc-btn { 
    background: var(--s2); border: 1px solid var(--b1); border-radius: 8px; 
    padding: .75rem; font-size: 15px; font-family: 'Syne', sans-serif; font-weight: 600; 
    color: var(--tx); cursor: pointer; transition: all .15s; 
}
.calc-btn:hover { background: var(--s3); transform: scale(1.05); }
.calc-btn.op { color: var(--amber); }
.calc-btn.eq { background: var(--blue); color: #060810; grid-column: span 2; }
.calc-btn.clear { color: var(--red); }
.calc-btn.zero { grid-column: span 2; }

/* ── BAR CHART ── */
.barchart { display: flex; align-items: flex-end; gap: 5px; height: 110px; margin-top: 10px; }
.bc { flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px; height: 100%; }
.bf { width: 100%; border-radius: 3px 3px 0 0; min-height: 3px; background: var(--bdim); border: 1px solid var(--bbd); transition: height 0.6s ease; }
.bl { font-size: 9px; color: var(--tx3); }