/* ============================================================
   GymTracker Pro — CSS Principal v3.0
   Mobile-First | Gym UX | Manual de marca azul #2E9FD8
   Touch targets mín 48px | Inter font | Dark/Light mode
   ============================================================ */

:root {
    --blue:        #2E9FD8;
    --blue-dark:   #1A3A5C;
    --blue-hover:  #1a7dab;
    --blue-light:  rgba(46,159,216,0.12);
    --cyan:        #00E5FF;
    --green:       #00CC66;
    --danger:      #FF4D4D;
    --warning:     #FFB800;
    --info:        #2E9FD8;
    --bg:          #EDF2F7;
    --bg2:         #FFFFFF;
    --bg3:         #D8E6F0;
    --border:      #B0C8DC;
    --text:        #1A3A5C;
    --text2:       #2A5070;
    --text3:       #6A8BA8;
    --shadow:      0 4px 24px rgba(46,159,216,0.10);
    --shadow-lg:   0 8px 40px rgba(46,159,216,0.15);
    --radius:      14px;
    --radius-sm:   8px;
    --radius-lg:   20px;
    --transition:  all 0.2s ease;
    --touch-min:   52px;
    --sidebar-w:   268px;
    --topbar-h:    64px;
    --card:        #FFFFFF;
}

[data-theme="dark"] {
    --bg:          #0F1923;
    --bg2:         #162230;
    --bg3:         #111D28;
    --border:      #1E3448;
    --text:        #FFFFFF;
    --text2:       #A0B4C8;
    --text3:       #5A7A94;
    --shadow:      0 4px 24px rgba(0,0,0,0.4);
    --shadow-lg:   0 8px 40px rgba(0,0,0,0.6);
    --card:        #162230;
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background .3s, color .3s;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* ── AUTH ── */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 2rem 1.5rem;
    position: relative;
    overflow-y: auto;
    align-items: flex-start;
    background: linear-gradient(135deg, #0a1628 0%, #0f2744 40%, #0a1f3d 70%, #061220 100%);
}
.auth-page::before,
.auth-page::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.35;
    animation: orbFloat 12s ease-in-out infinite alternate;
    pointer-events: none;
}
.auth-page::before {
    width: 520px; height: 520px;
    background: radial-gradient(circle, #2E9FD8 0%, transparent 70%);
    top: -120px; left: -120px;
}
.auth-page::after {
    width: 420px; height: 420px;
    background: radial-gradient(circle, #00E5FF 0%, transparent 70%);
    bottom: -100px; right: -100px;
    animation-delay: -6s; animation-duration: 15s;
}
@keyframes orbFloat {
    0%   { transform: translate(0,0) scale(1); }
    50%  { transform: translate(40px,30px) scale(1.08); }
    100% { transform: translate(-20px,50px) scale(0.95); }
}
.auth-wrapper { width:100%; display:flex; justify-content:center; position:relative; z-index:1; }
.auth-card {
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 24px;
    padding: 2.75rem 2.5rem;
    width: 100%; max-width: 420px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.45), 0 1px 0 rgba(255,255,255,0.08) inset;
}
.auth-card--wide { max-width: 640px; }
.auth-logo { text-align:center; margin-bottom:2.25rem; }
.auth-svg-logo { display:flex; justify-content:center; margin-bottom:1rem; }
.auth-svg-logo svg { width:64px; height:64px; filter:drop-shadow(0 0 18px rgba(46,159,216,0.55)); }
.auth-logo h1 { font-size:1.75rem; font-weight:800; color:#fff; letter-spacing:-0.5px; }
.auth-logo h1 em { font-style:normal; color:#2E9FD8; }
.auth-logo p { color:rgba(255,255,255,0.5); font-size:0.875rem; margin-top:0.3rem; }
.auth-card .form-group label {
    color:rgba(255,255,255,0.75); font-size:0.82rem; font-weight:500;
    letter-spacing:0.03em; text-transform:uppercase; margin-bottom:0.4rem; display:block;
}
.auth-card .form-control {
    background: rgba(255,255,255,0.07);
    border: 1px solid rgba(255,255,255,0.13);
    color: #fff; border-radius:12px;
    padding: 0.9rem 1rem; font-size:1rem;
    min-height: var(--touch-min);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    width: 100%;
}
.auth-card .form-control::placeholder { color:rgba(255,255,255,0.3); }
.auth-card .form-control:focus {
    background:rgba(255,255,255,0.11); border-color:#2E9FD8;
    box-shadow:0 0 0 3px rgba(46,159,216,0.25); outline:none; color:#fff;
}
.auth-card .btn-primary {
    background: linear-gradient(135deg,#2E9FD8 0%,#1a7dab 100%);
    border:none; border-radius:14px; padding:1rem;
    font-size:1rem; font-weight:700; color:#fff;
    width:100%; min-height:var(--touch-min);
    cursor:pointer; letter-spacing:0.02em;
    box-shadow:0 4px 20px rgba(46,159,216,0.4);
    transition:transform 0.15s, box-shadow 0.15s;
}
.auth-card .btn-primary:hover { transform:translateY(-1px); box-shadow:0 6px 28px rgba(46,159,216,0.55); }
.auth-card .btn-primary:active { transform:translateY(0); }
.auth-links { text-align:center; margin-top:1.5rem; font-size:0.875rem; color:rgba(255,255,255,0.4); }
.auth-links a { color:#2E9FD8; font-weight:600; }
.auth-links a:hover { color:#00E5FF; text-decoration:none; }
.auth-card .alert {
    border-radius:10px; background:rgba(255,77,77,0.15);
    border:1px solid rgba(255,77,77,0.3); color:#ff8080;
    padding:0.75rem 1rem; font-size:0.875rem; margin-bottom:1.25rem;
}
.auth-card .alert-success { background:rgba(0,204,102,0.12); border-color:rgba(0,204,102,0.3); color:#00dd77; }
.rol-selector { display:grid; grid-template-columns:1fr 1fr; gap:1rem; margin-bottom:1.5rem; }
.rol-option input { display:none; }
.rol-card {
    border:2px solid rgba(255,255,255,0.15); border-radius:var(--radius);
    padding:1rem; text-align:center; cursor:pointer; transition:var(--transition);
    display:flex; flex-direction:column; gap:0.25rem; color:#fff;
    min-height:80px; justify-content:center;
}
.rol-card:hover { border-color:rgba(46,159,216,0.5); }
.rol-option input:checked + .rol-card { border-color:var(--blue); background:rgba(46,159,216,0.15); }
.rol-icon { font-size:1.8rem; }
.rol-card strong { font-size:0.95rem; }
.rol-card small { color:rgba(255,255,255,0.5); font-size:0.78rem; }
.info-box {
    display:flex; align-items:flex-start; gap:0.75rem;
    background:rgba(46,159,216,0.08); border:1px solid rgba(46,159,216,0.2);
    border-radius:var(--radius); padding:1rem; margin-bottom:1rem;
    font-size:0.875rem; color:var(--blue);
}

/* ── FORMS ── */
.form-group { margin-bottom:1.25rem; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:1rem; }
label { display:block; font-size:0.875rem; font-weight:600; margin-bottom:0.45rem; color:var(--text2); }
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="time"],
select,
textarea {
    width:100%; padding:0.85rem 1rem;
    background:var(--bg2); border:2px solid var(--border);
    border-radius:var(--radius); color:var(--text);
    font-size:1rem; font-family:inherit; outline:none;
    transition:var(--transition); min-height:var(--touch-min);
    -webkit-appearance:none;
}
input:focus, select:focus, textarea:focus {
    border-color:var(--blue); box-shadow:0 0 0 3px rgba(46,159,216,0.2); background:var(--bg2);
}
textarea { min-height:100px; resize:vertical; }
input::placeholder, textarea::placeholder { color:var(--text3); }
select option { background:var(--bg2); color:var(--text); }

/* ── BOTONES ── */
.btn {
    display:inline-flex; align-items:center; justify-content:center;
    gap:0.5rem; padding:0.85rem 1.5rem;
    border-radius:var(--radius); font-size:0.95rem; font-weight:700;
    cursor:pointer; border:2px solid transparent;
    transition:var(--transition); text-decoration:none; font-family:inherit;
    min-height:var(--touch-min); white-space:nowrap;
    -webkit-tap-highlight-color:transparent; user-select:none;
}
.btn:active { transform:scale(0.97); }
.btn-primary { background:var(--blue); color:#fff; border-color:var(--blue); box-shadow:0 4px 16px rgba(46,159,216,0.3); }
.btn-primary:hover { background:var(--blue-hover); border-color:var(--blue-hover); box-shadow:0 6px 20px rgba(46,159,216,0.45); text-decoration:none; }
.btn-secondary { background:transparent; border-color:var(--blue); color:var(--blue); }
.btn-secondary:hover { background:var(--blue); color:#fff; text-decoration:none; }
.btn-danger { background:var(--danger); color:#fff; border-color:var(--danger); }
.btn-danger:hover { opacity:0.85; }
.btn-success { background:var(--green); color:#fff; border-color:var(--green); }
.btn-success:hover { opacity:0.88; }
.btn-ghost { background:var(--bg3); border-color:var(--border); color:var(--text2); }
.btn-ghost:hover { border-color:var(--blue); color:var(--blue); }
.btn-block { width:100%; }
.btn-sm { padding:0.5rem 1rem; font-size:0.82rem; min-height:40px; }
.btn-lg { padding:1rem 2rem; font-size:1.05rem; border-radius:var(--radius-lg); }
.btn-icon { padding:0.75rem; min-width:var(--touch-min); border-radius:50%; }
.fab {
    position:fixed; bottom:5rem; right:1.25rem;
    width:58px; height:58px; border-radius:50%;
    background:var(--blue); color:#fff; font-size:1.5rem;
    border:none; cursor:pointer;
    box-shadow:0 6px 24px rgba(46,159,216,0.5);
    display:none; align-items:center; justify-content:center;
    z-index:90; transition:var(--transition);
    -webkit-tap-highlight-color:transparent;
}
.fab:active { transform:scale(0.93); }

/* ── ALERTAS ── */
.alert { padding:0.9rem 1rem; border-radius:var(--radius); margin-bottom:1.25rem; font-size:0.9rem; font-weight:500; }
.alert-error   { background:rgba(255,77,77,0.08);   border:1px solid rgba(255,77,77,0.25);   color:#e05555; }
.alert-success { background:rgba(0,204,102,0.08);   border:1px solid rgba(0,204,102,0.25);   color:#00a854; }
.alert-warning { background:rgba(255,184,0,0.08);   border:1px solid rgba(255,184,0,0.25);   color:#c98f00; }
.alert-info    { background:rgba(46,159,216,0.08);  border:1px solid rgba(46,159,216,0.25);  color:var(--blue); }
[data-theme="dark"] .alert-error   { color:#ff8a8a; }
[data-theme="dark"] .alert-success { color:#4ddb99; }
[data-theme="dark"] .alert-warning { color:#ffd055; }
[data-theme="dark"] .alert-info    { color:#7dccf0; }

/* ── LAYOUT ── */
.dashboard { display:flex; min-height:100vh; }

.topbar-mobile {
    display:none; position:fixed; top:0; left:0; right:0;
    height:var(--topbar-h); background:var(--blue-dark);
    z-index:120; align-items:center; padding:0 1rem; gap:0.75rem;
    box-shado(0,0,0,0.3);
}
.topbar-mobile .tm-brand { flex:1; font-size:1rem; font-weight:900; color:#fff; text-align:center; }
.topbar-mobile .tm-brand em { font-style:normal; color:var(--cyan); }
.topbar-mobile .tm-avatar {
    width:38px; height:38px; border-radius:50%;
    background:var(--blue); border:2px solid rgba(255,255,255,0.3);
    display:flex; align-items:center; justify-content:center;
    font-weight:800; color:#fff; font-size:0.82rem;
    overflow:hidden; flex-shrink:0;
}
.topbar-mobile .tm-avatar img { width:100%; height:100%; object-fit:cover; }

.sidebar-toggle {
    display:none; background:transparent; border:none; color:#fff;
    cursor:pointer; width:44px; height:44px; border-radius:var(--radius-sm);
    align-items:center; justify-content:center; font-size:1.25rem; flex-shrink:0;
    -webkit-tap-highlight-color:transparent; transition:background 0.2s;
}
.sidebar-toggle:hover { background:rgba(255,255,255,0.1); }

.sidebar {
    width:var(--sidebar-w); background:var(--blue-dark);
    border-right:1px solid rgba(255,255,255,0.07);
    padding:1.5rem 0; position:fixed; top:0; left:0;
    height:100vh; overflow-y:auto; z-index:110;
    display:flex; flex-direction:column;
    transition:transform 0.3s cubic-bezier(.4,0,.2,1);
}
.sidebar-logo {
    padding:0 1.5rem 1.5rem; border-bottom:1px solid rgba(255,255,255,0.08);
    margin-bottom:1rem; display:flex; align-items:center; gap:0.6rem;
}
.sidebar-logo h2 { font-size:1rem; font-weight:900; color:#fff; }
.sidebar-logo h2 em { color:var(--cyan); font-style:normal; }
.sidebar-logo span { font-size:0.72rem; color:rgba(255,255,255,0.4); display:block; }
.sidebar-svg-logo { display:flex; align-items:center; filter:drop-shadow(0 0 8px rgba(46,159,216,0.5)); }
.sidebar-nav { flex:1; overflow-y:auto; }
.sidebar-menu { list-style:none; padding:0 0.75rem; }
.sidebar-menu li a {
    display:flex; align-items:center; gap:0.85rem;
    padding:0.85rem 1rem; border-radius:var(--radius);
    color:rgba(255,255,255,0.6); font-size:0.9rem; font-weight:500;
    transition:var(--transition); text-decoration:none; min-height:var(--touch-min);
}
.sidebar-menu li a:hover,
.sidebar-menu li a.active { background:rgba(255,255,255,0.1); color:#fff; text-decoration:none; }
.sidebar-menu li a.active { background:rgba(46,159,216,0.25); color:var(--cyan); }
.sidebar-menu .menu-icon { font-size:1.15rem; width:1.5rem; text-align:center; flex-shrink:0; }
.sidebar-section {
    padding:1rem 1.5rem 0.35rem; font-size:0.65rem; font-weight:700;
    text-transform:uppercase; letter-spacing:0.8px; color:rgba(255,255,255,0.25);
}
.sidebar-footer { padding:1rem 1.5rem; border-top:1px solid rgba(255,255,255,0.08); margin-top:auto; }

.sidebar-overlay {
    display:none; position:fixed; inset:0;
    background:rgba(0,0,0,0.55); z-index:109; backdrop-filter:blur(2px);
}
.sidebar-overlay.active { display:block; }

.main-content {
    margin-left:var(--sidebar-w); flex:1; padding:2rem;
    max-width:calc(100vw - var(--sidebar-w)); background:var(--bg); min-height:100vh;
}

.topbar {
    display:flex; align-items:center; justify-content:space-between;
    margin-bottom:2rem; padding-bottom:1rem; border-bottom:1px solid var(--border);
}
.topbar h1 { font-size:1.5rem; font-weight:800; color:var(--text); }
.topbar-sub { font-size:0.82rem; color:var(--text3); margin-top:0.15rem; }
.topbar-user { display:flex; align-items:center; gap:0.75rem; font-size:0.875rem; color:var(--text2); }
.avatar {
    width:38px; height:38px; border-radius:50%; background:var(--blue);
    display:flex; align-items:center; justify-content:center;
    font-weight:800; color:#fff; font-size:0.85rem; flex-shrink:0; overflow:hidden;
}

/* ── CARDS ── */
.cards-grid {
    display:grid; grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
    gap:1.25rem; margin-bottom:2rem;
}
.card {
    background:var(--card); border:1px solid var(--border);
    border-radius:var(--radius); padding:1.5rem; box-shadow:var(--shadow);
    transition:box-shadow 0.2s, transform 0.2s;
}
.card:hover { box-shadow:var(--shadow-lg); }
.card-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:1rem; }
.card-title { font-size:0.82rem; font-weight:700; text-transform:uppercase; letter-spacing:0.5px; color:var(--text3); }
.card-stat .stat-value { font-size:2rem; font-weight:900; color:var(--blue); line-height:1; }
.card-stat .stat-label { color:var(--text3); font-size:0.82rem; margin-top:0.35rem; }
.card-stat .stat-icon  { font-size:1.5rem; opacity:0.6; }
.stat-change { font-size:0.75rem; font-weight:600; margin-top:0.25rem; }
.stat-change.up   { color:var(--green); }
.stat-change.down { color:var(--danger); }
.card-tap { cursor:pointer; -webkit-tap-highlight-color:transparent; user-select:none; }
.card-tap:active { transform:scale(0.98); }

/* ── TABLAS ── */
.table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; border-radius:var(--radius); border:1px solid var(--border); }
table { width:100%; border-collapse:collapse; font-size:0.875rem; }
th {
    text-align:left; padding:0.85rem 1rem; background:var(--bg3);
    color:var(--text3); font-size:0.75rem; font-weight:700;
    text-transform:uppercase; letter-spacing:0.5px;
    border-bottom:1px solid var(--border); white-space:nowrap;
}
td { padding:0.9rem 1rem; border-bottom:1px solid var(--border); color:var(--text); vertical-align:middle; }
tr:last-child td { border-bottom:none; }
tr:hover td { background:rgba(46,159,216,0.04); }

/* ── BADGES ── */
.badge { display:inline-flex; align-items:center; gap:4px; padding:0.25rem 0.7rem; border-radius:50px; font-size:0.72rem; font-weight:700; }
.badge-success { background:rgba(0,204,102,0.12);  color:#00a854; border:1px solid rgba(0,204,102,0.2); }
.badge-warning { background:rgba(255,184,0,0.12);  color:#c98f00; border:1px solid rgba(255,184,0,0.2); }
.badge-danger  { background:rgba(255,77,77,0.12);  color:#e04444; border:1px solid rgba(255,77,77,0.2); }
.badge-info    { background:rgba(46,159,216,0.12); color:var(--blue); border:1px solid rgba(46,159,216,0.2); }
.badge-muted   { background:var(--bg3); color:var(--text3); border:1px solid var(--border); }
[data-theme="dark"] .badge-success { color:#4ddb99; }
[data-theme="dark"] .badge-warning { color:#ffd055; }
[data-theme="dark"] .badge-danger  { color:#ff7070; }

/* ── PROGRESS ── */
.progress-wrap { margin:0.4rem 0; }
.progress-label { display:flex; justify-content:space-between; font-size:0.75rem; color:var(--text3); margin-bottom:0.3rem; }
.progress-bar { height:8px; background:var(--bg3); border-radius:50px; overflow:hidden; }
.progress-fill { height:100%; border-radius:50px; background:var(--blue); transition:width 0.5s ease; }
.progress-fill.green  { background:var(--green); }
.progress-fill.cyan   { background:var(--cyan); }
.progress-fill.orange { background:var(--warning); }
.progress-fill.red    { background:var(--danger); }

/* ── SECTION HEADERS ── */
.sec-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:1.25rem; gap:1rem; flex-wrap:wrap; }
.sec-header h2 { font-size:1.1rem; font-weight:800; color:var(--text); }
.sec-label-pill {
    display:inline-block; background:rgba(46,159,216,0.1); color:var(--blue);
    padding:4px 14px; border-radius:50px; font-size:0.7rem; font-weight:700;
    border:1px solid rgba(46,159,216,0.2); text-transform:uppercase; letter-spacing:0.5px;
}

/* ── MODALES ── */
.modal-overlay {
    position:fixed; inset:0; background:rgba(0,0,0,0.55); z-index:200;
    display:flex; align-items:center; justify-content:center; padding:1rem;
    backdrop-filter:blur(4px); -webkit-backdrop-filter:blur(4px);
}
.modal {
    background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius-lg);
    padding:2rem; width:100%; max-width:480px;
    box-shadow:0 20px 60px rgba(0,0,0,0.3); max-height:90vh; overflow-y:auto;
}
.modal-header { display:flex; align-items:center; justify-content:space-between; margin-bottom:1.5rem; gap:1rem; }
.modal-header h3 { font-size:1.1rem; font-weight:800; }
.modal-close {
    background:var(--bg3); border:none; cursor:pointer; color:var(--text3);
    font-size:1.1rem; width:36px; height:36px; border-radius:50%;
    display:flex; align-items:center; justify-content:center;
    flex-shrink:0; transition:var(--transition);
}
.modal-close:hover { background:var(--danger); color:#fff; }

/* ── EMPTY STATE ── */
.empty-state { text-align:center; padding:3rem 1.5rem; color:var(--text3); }
.empty-state .empty-icon { font-size:3rem; margin-bottom:1rem; opacity:0.5; }
.empty-state h3 { font-size:1rem; font-weight:700; color:var(--text2); margin-bottom:0.5rem; }
.empty-state p  { font-size:0.875rem; line-height:1.6; }

/* ── CHAT ── */
.chat-wrap { display:flex; height:calc(100vh - 160px); gap:1.25rem; }
.chat-sidebar { width:280px; background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius); overflow-y:auto; flex-shrink:0; }
.chat-main { flex:1; display:flex; flex-direction:column; background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius); overflow:hidden; }
.chat-messages { flex:1; overflow-y:auto; padding:1.25rem; display:flex; flex-direction:column; gap:0.75rem; -webkit-overflow-scrolling:touch; }
.msg { display:flex; flex-direction:column; max-width:78%; }
.msg.sent  { align-self:flex-end;  align-items:flex-end; }
.msg.recv  { align-self:flex-start; align-items:flex-start; }
.msg-bubble { padding:0.75rem 1rem; border-radius:16px; font-size:0.9rem; line-height:1.5; word-break:break-word; }
.msg.sent .msg-bubble  { background:var(--blue); color:#fff; border-bottom-right-radius:4px; }
.msg.recv .msg-bubble  { background:var(--bg3); color:var(--text); border-bottom-left-radius:4px; }
.msg-time { font-size:0.68rem; color:var(--text3); margin-top:3px; padding:0 4px; }
.chat-input-wrap { padding:0.85rem; border-top:1px solid var(--border); display:flex; gap:0.65rem; align-items:flex-end; }
.chat-input-wrap textarea { flex:1; resize:none; min-height:48px; max-height:120px; border-radius:12px; padding:0.75rem 1rem; font-size:0.95rem; }
.chat-input-wrap .btn { min-width:52px; flex-shrink:0; }

/* ── THEME BTN ── */
.theme-btn {
    background:none; border:1px solid rgba(255,255,255,0.15); border-radius:50px;
    padding:6px 14px; cursor:pointer; font-size:0.78rem;
    color:rgba(255,255,255,0.5); font-family:inherit; transition:var(--transition); min-height:36px;
}
.theme-btn:hover { border-color:rgba(255,255,255,0.4); color:#fff; }

/* ── BOTTOM NAV ── */
.bottom-nav {
    display:none; position:fixed; bottom:0; left:0; right:0;
    height:64px; background:var(--blue-dark);
    border-top:1px solid rgba(255,255,255,0.1);
    z-index:100; align-items:center; justify-content:space-around; padding:0 0.5rem;
}
.bottom-nav a {
    display:flex; flex-direction:column; align-items:center; justify-content:center;
    gap:3px; color:rgba(255,255,255,0.5); font-size:0.6rem; font-weight:600;
    text-decoration:none; flex:1; min-height:100%; padding:0 0.25rem;
    text-transform:uppercase; letter-spacing:0.3px; transition:color 0.2s;
    -webkit-tap-highlight-color:transparent;
}
.bottom-nav a .bn-icon { font-size:1.35rem; line-height:1; }
.bottom-nav a.active,
.bottom-nav a:hover { color:var(--cyan); text-decoration:none; }

/* ── RESPONSIVE ── */
@media (max-width:900px) {
    :root { --sidebar-w:220px; }
    .main-content { padding:1.5rem; }
    .cards-grid { grid-template-columns:repeat(2,1fr); gap:1rem; }
}

@media (max-width:768px) {
    .sidebar { transform:translateX(-100%); }
    .sidebar.open { transform:translateX(0); box-shadow:4px 0 24px rgba(0,0,0,0.4); }
    .topbar-mobile { display:flex; }
    .sidebar-toggle { display:flex; }
    .main-content {
        margin-left:0; max-width:100vw; padding:1rem;
        padding-top:calc(var(--topbar-h) + 1rem);
        padding-bottom:80px;
    }
    .topbar { display:none; }
    .cards-grid { grid-template-columns:1fr 1fr !important; gap:0.75rem; }
    .cards-grid-1col { grid-template-columns:1fr !important; }
    .card { padding:1rem 1.1rem; }
    .card-stat .stat-value { font-size:1.75rem; }
    .form-row { grid-template-columns:1fr !important; }
    input[type="text"],input[type="email"],input[type="password"],
    input[type="number"],input[type="date"],input[type="time"],
    select,textarea { font-size:16px; padding:0.9rem 1rem; }
    .btn { min-height:52px; font-size:0.95rem; }
    .btn-sm { min-height:40px; }
    .table-wrap { border-radius:var(--radius-sm); }
    table { min-width:480px; }
    .topbar-user span { display:none; }
    .chat-wrap { flex-direction:column; height:calc(100vh - var(--topbar-h) - 80px); }
    .chat-sidebar { width:100%; height:180px; }
    .chat-main { flex:1; min-height:300px; }
    .bottom-nav { display:flex; }
    .fab { display:flex; }
    .sec-header { margin-bottom:1rem; }
    .auth-card { padding:2rem 1.5rem; }
    .auth-card--wide { padding:1.75rem 1.5rem; }
    div[style*="grid-template-columns: 1fr 1fr"],
    div[style*="grid-template-columns:1fr 1fr"] { display:flex !important; flex-direction:column !important; }
}

@media (max-width:600px) {
    .modal-overlay { align-items:flex-end; padding:0; }
    .modal { border-radius:var(--radius-lg) var(--radius-lg) 0 0; max-height:92vh; padding:1.5rem; }
    .modal::before { content:''; display:block; width:40px; height:4px; background:var(--border); border-radius:2px; margin:0 auto 1.
}

@media (max-width:380px) {
    .main-content { padding:0.85rem; padding-top:calc(var(--topbar-h) + 0.85rem); padding-bottom:80px; }
    .cards-grid { grid-template-columns:1fr !important; }
    .btn { font-size:0.9rem; }
}

/* ── UTILIDADES ── */
.text-muted   { color:var(--text3); }
.text-blue    { color:var(--blue); }
.text-green   { color:var(--green); }
.text-danger  { color:var(--danger); }
.text-warning { color:var(--warning); }
.text-sm      { font-size:0.82rem; }
.text-xs      { font-size:0.72rem; }
.fw-bold      { font-weight:700; }
.fw-black     { font-weight:900; }
.mt-1 { margin-top:0.5rem; }
.mt-2 { margin-top:1rem; }
.mt-3 { margin-top:1.5rem; }
.mb-0 { margin-bottom:0 !important; }
.mb-1 { margin-bottom:0.5rem; }
.mb-2 { margin-bottom:1rem; }
.mb-3 { margin-bottom:1.5rem; }
.p-0  { padding:0 !important; }
.gap-1 { gap:0.5rem; }
.gap-2 { gap:1rem; }
.flex         { display:flex; }
.flex-center  { display:flex; align-items:center; }
.flex-between { display:flex; align-items:center; justify-content:space-between; }
.flex-col     { display:flex; flex-direction:column; }
.flex-wrap    { flex-wrap:wrap; }
.w-100        { width:100%; }
.d-none       { display:none !important; }
.rounded      { border-radius:var(--radius); }
.overflow-hidden { overflow:hidden; }
.divider { height:1px; background:var(--border); margin:1.25rem 0; border:none; }
.spinner { width:24px; height:24px; border:3px solid var(--border); border-top-color:var(--blue); border-radius:50%; animation:spin 0.7s linear infinite; display:inline-block; }
@keyframes spin { to { transform:rotate(360deg); } }
::-webkit-scrollbar { width:6px; height:6px; }
::-webkit-scrollbar-track { background:var(--bg3); }
::-webkit-scrollbar-thumb { background:var(--border); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:var(--blue); }

/* ── Selector días semana ── */
label:has(input[name="dias[]"]:checked) {
    background: #2E9FD8 !important;
    border-color: #2E9FD8 !important;
    color: #ffffff !important;
    box-shadow: 0 2px 10px rgba(46,159,216,0.45);
}
label:has(input[name="dias[]"]:not(:checked)) {
    background: var(--bg2);
    color: var(--text2);
}

/* Excepción: grids de series en entrenamientos no colapsan en mobile */
.serie-row { display:grid !important; flex-direction:unset !important; }

/* Grids de series — nunca colapsar en mobile */
.serie-row,
.serie-header {
    display:grid !important;
    flex-direction:unset !important;
    width:100%;
}

/* Forzar grids de series en mobile */
@media (max-width:768px) {
    .serie-row {
        display:grid !important;
        flex-direction:unset !important;
        align-items:center;
    }
}