/* ===== TaskFlow — styles partagés ===== */
:root{
  --bg:#0f172a;
  --surface:#1e293b;
  --surface-2:#182237;
  --border:#334155;
  --text:#e2e8f0;
  --muted:#94a3b8;
  --accent:#38bdf8;
  --accent-2:#0ea5e9;
  --accent-soft:rgba(56,189,248,.14);
  --success:#22c55e;
  --warning:#f59e0b;
  --danger:#ef4444;
  --radius:14px;
  --radius-sm:9px;
  --shadow:0 18px 40px rgba(2,6,23,.55);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;min-height:100vh;
  background:radial-gradient(1100px 520px at 10% -10%,rgba(56,189,248,.16),transparent 60%),radial-gradient(900px 460px at 95% 0%,rgba(14,165,233,.12),transparent 62%),var(--bg);
  color:var(--text);
  font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.25;letter-spacing:-.02em;font-weight:700}
h1{font-size:clamp(2rem,5vw,3.4rem)}
h2{font-size:clamp(1.5rem,3vw,2rem)}
h3{font-size:1.15rem}
p{margin:0 0 1rem}
a{color:var(--accent);text-decoration:none;transition:color .15s ease}
a:hover{color:#7dd3fc}
ul{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
::selection{background:var(--accent);color:#04121f}

.container{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.small{font-size:.86rem}

/* ===== Boutons ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.72rem 1.25rem;border:1px solid transparent;border-radius:10px;font:inherit;font-weight:600;font-size:.95rem;cursor:pointer;transition:transform .12s ease,background .15s ease,border-color .15s ease,box-shadow .15s ease;text-decoration:none;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#04121f;box-shadow:0 10px 24px rgba(56,189,248,.28)}
.btn-primary:hover{background:linear-gradient(135deg,#7dd3fc,#38bdf8);color:#04121f}
.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.btn-danger{background:rgba(239,68,68,.12);border-color:rgba(239,68,68,.45);color:#fca5a5}
.btn-danger:hover{background:rgba(239,68,68,.2);color:#fecaca}
.btn-sm{padding:.45rem .85rem;font-size:.85rem;border-radius:8px}
.btn-block{width:100%}
.btn[disabled]{opacity:.6;cursor:not-allowed;transform:none}

/* ===== Formulaires ===== */
.field{display:flex;flex-direction:column;gap:.35rem;margin-bottom:1rem}
.field.grow{flex:1 1 240px}
label{font-size:.78rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
input,select,textarea{width:100%;padding:.7rem .85rem;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;color:var(--text);font:inherit;font-size:.95rem;transition:border-color .15s ease,box-shadow .15s ease}
textarea{resize:vertical;min-height:90px}
input::placeholder,textarea::placeholder{color:#64748b}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
input[type=date]{color-scheme:dark}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%);background-position:calc(100% - 18px) 52%,calc(100% - 13px) 52%;background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-right:2.2rem}
.form-row{display:flex;gap:1rem;flex-wrap:wrap}
.form-row>.field{flex:1 1 200px;margin-bottom:0}

/* ===== Alertes & toasts ===== */
.alert{display:none;padding:.8rem 1rem;border-radius:10px;font-size:.9rem;border:1px solid transparent;margin-bottom:1rem;white-space:pre-line}
.alert.is-visible{display:block}
.alert-error{background:rgba(239,68,68,.12);border-color:rgba(239,68,68,.4);color:#fecaca}
.alert-success{background:rgba(34,197,94,.12);border-color:rgba(34,197,94,.4);color:#bbf7d0}
.toast-container{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:.6rem;z-index:80;max-width:min(360px,calc(100vw - 36px))}
.toast{padding:.75rem 1rem;border-radius:10px;background:var(--surface);border:1px solid var(--border);box-shadow:var(--shadow);font-size:.9rem;animation:toast-in .18s ease}
.toast-success{border-color:rgba(34,197,94,.5)}
.toast-error{border-color:rgba(239,68,68,.55)}
.toast-out{opacity:0;transform:translateY(6px);transition:opacity .2s ease,transform .2s ease}
@keyframes toast-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ===== Landing ===== */
.site-header{position:sticky;top:0;z-index:40;backdrop-filter:blur(12px);background:rgba(15,23,42,.78);border-bottom:1px solid rgba(51,65,85,.7)}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:inline-flex;align-items:center;gap:.6rem;font-weight:700;font-size:1.1rem;color:var(--text);letter-spacing:-.02em}
.brand:hover{color:var(--text)}
.brand-mark{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:grid;place-items:center;color:#04121f;font-weight:800;font-size:.9rem;flex-shrink:0}
.nav-links{display:flex;align-items:center;gap:1rem}
.hero{padding:clamp(3rem,8vw,6rem) 0 2rem;text-align:center}
.hero p.lead{max-width:620px;margin:0 auto 2rem;font-size:clamp(1rem,2vw,1.2rem);color:var(--muted)}
.hero-actions{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}
.features{padding:3rem 0 4rem}
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.25rem}
.feature-card{background:linear-gradient(180deg,rgba(30,41,59,.95),rgba(24,34,55,.85));border:1px solid var(--border);border-radius:var(--radius);padding:1.6rem;transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.feature-card:hover{transform:translateY(-4px);border-color:rgba(56,189,248,.55);box-shadow:0 18px 36px rgba(2,6,23,.5)}
.feature-icon{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);margin-bottom:1rem;border:1px solid rgba(56,189,248,.3)}
.feature-card p{color:var(--muted);font-size:.94rem;margin:0}
.site-footer{border-top:1px solid var(--border);padding:2rem 0;margin-top:2rem;color:var(--muted);font-size:.88rem}
.site-footer .container{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center}
.footer-links{display:flex;gap:1.25rem;flex-wrap:wrap}
.footer-links a{color:var(--muted)}
.footer-links a:hover{color:var(--accent)}

/* ===== Auth ===== */
.auth-page{display:flex;flex-direction:column;min-height:100vh}
.auth-wrap{flex:1;display:flex;align-items:center;justify-content:center;padding:2.5rem 20px}
.auth-card{width:100%;max-width:430px;background:rgba(30,41,59,.9);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;box-shadow:var(--shadow)}
.auth-card h1{font-size:1.6rem}
.auth-card .sub{color:var(--muted);font-size:.92rem;margin-bottom:1.5rem}
.auth-alt{text-align:center;font-size:.9rem;color:var(--muted);margin:1.25rem 0 0}

/* ===== App / Kanban ===== */
.app-page{display:flex;flex-direction:column;min-height:100vh}
.app-header{position:sticky;top:0;z-index:40;background:rgba(15,23,42,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.app-header-inner{max-width:1280px;margin:0 auto;padding:.7rem 20px;display:flex;align-items:center;justify-content:space-between;gap:1rem}
.app-user{display:flex;align-items:center;gap:.9rem;min-width:0}
.user-email{font-size:.88rem;color:var(--muted);max-width:240px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.app-main{max-width:1280px;padding:1.5rem 20px 3rem;flex:1;width:100%;margin:0 auto}
.card{background:rgba(30,41,59,.85);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem}
.toolbar{margin-bottom:1.25rem}
.task-form .form-row{margin-bottom:.9rem}
.task-form .form-row:last-child{margin-bottom:0}
.field-action{justify-content:flex-end}
.field-action .btn{margin-top:auto;height:42px}
.filters{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center;margin-bottom:1.25rem}
.filter-group{display:flex;gap:.5rem;align-items:center;flex-wrap:wrap}
.chip{padding:.45rem .9rem;border-radius:999px;border:1px solid var(--border);background:transparent;color:var(--muted);font:inherit;font-size:.85rem;font-weight:600;cursor:pointer;transition:color .15s ease,border-color .15s ease,background .15s ease}
.chip:hover{color:var(--text);border-color:var(--accent)}
.chip.is-active{background:var(--accent-soft);border-color:var(--accent);color:var(--accent)}
.input-sm,.select-sm{padding:.45rem .7rem;font-size:.86rem;border-radius:8px;width:auto;min-width:150px}
.board{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.1rem;align-items:start}
.column{background:rgba(24,34,55,.6);border:1px solid var(--border);border-radius:var(--radius);padding:.9rem;min-height:160px;transition:border-color .15s ease,background .15s ease}
.column.is-hidden{display:none}
.column.drag-over{border-color:var(--accent);background:rgba(56,189,248,.08)}
.column-head{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.85rem;padding:0 .2rem}
.column-head h3{margin:0;font-size:.9rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.count{min-width:26px;text-align:center;font-size:.78rem;font-weight:700;padding:.15rem .5rem;border-radius:999px;background:var(--accent-soft);color:var(--accent)}
.column-body{display:flex;flex-direction:column;gap:.75rem;min-height:60px}
.task-card{background:linear-gradient(180deg,rgba(30,41,59,.98),rgba(23,32,51,.95));border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:11px;padding:.85rem .9rem;cursor:grab;transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}
.task-card:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(2,6,23,.45)}
.task-card.dragging{opacity:.45}
.task-top{display:flex;align-items:flex-start;justify-content:space-between;gap:.5rem}
.task-title{margin:0;font-size:.98rem;font-weight:600;word-break:break-word}
.task-actions{display:flex;gap:.25rem;flex-shrink:0}
.icon-btn{width:26px;height:26px;display:grid;place-items:center;border-radius:7px;border:1px solid transparent;background:transparent;color:var(--muted);font-size:.85rem;line-height:1;cursor:pointer;transition:background .15s ease,color .15s ease}
.icon-btn:hover{background:var(--accent-soft);color:var(--accent)}
.icon-btn.danger:hover{background:rgba(239,68,68,.16);color:#fca5a5}
.task-desc{margin:.45rem 0 0;font-size:.86rem;color:var(--muted);word-break:break-word;white-space:pre-line}
.task-tags{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:.6rem}
.tag{font-size:.72rem;font-weight:600;padding:.15rem .55rem;border-radius:999px;background:var(--accent-soft);color:#7dd3fc;border:1px solid rgba(56,189,248,.25)}
.task-foot{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-top:.7rem;flex-wrap:wrap}
.task-due{font-size:.76rem;color:var(--muted)}
.status-pill{padding:.2rem .6rem;border-radius:999px;border:1px solid var(--border);background:var(--surface-2);color:var(--muted);font:inherit;font-size:.74rem;font-weight:600;cursor:pointer;transition:color .15s ease,border-color .15s ease}
.status-pill:hover{color:var(--accent);border-color:var(--accent)}
.empty-state{text-align:center;color:#64748b;font-size:.84rem;padding:1.1rem .5rem;border:1px dashed var(--border);border-radius:10px}

/* ===== Modal ===== */
.modal-backdrop{position:fixed;inset:0;background:rgba(2,6,23,.72);backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;padding:20px;z-index:90}
.modal-backdrop[hidden]{display:none}
.modal{width:100%;max-width:520px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);max-height:calc(100vh - 40px);overflow:auto}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:1.1rem 1.25rem;border-bottom:1px solid var(--border)}
.modal-head h3{margin:0}
.modal-body{padding:1.25rem}
.modal-foot{display:flex;align-items:center;gap:.6rem;margin-top:.5rem;padding-top:1rem;border-top:1px solid var(--border)}
.modal-foot .spacer{flex:1}

/* ===== Responsive ===== */
@media (max-width:900px){
  .board{grid-template-columns:1fr}
}
@media (max-width:768px){
  body{font-size:15px}
  .site-header .container{height:60px}
  .nav-links{gap:.6rem}
  .nav-links .btn-ghost{display:none}
  .hero{padding:2.5rem 0 1rem}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
  .app-header-inner{flex-wrap:wrap}
  .user-email{max-width:150px}
  .filters{flex-direction:column;align-items:stretch}
  .filter-group{justify-content:flex-start}
  .input-sm,.select-sm{flex:1 1 auto;min-width:0}
  .form-row{flex-direction:column;gap:0}
  .form-row>.field{margin-bottom:.9rem}
  .toolbar{padding:1rem}
  .auth-card{padding:1.5rem}
  .modal-foot{flex-wrap:wrap}
  .modal-foot .btn{flex:1}
  .site-footer .container{flex-direction:column;text-align:center}
}