/* ── Shared CSS variables & reset ── */
:root {
    --bg:      #0f1117;
    --panel:   #1a1d2e;
    --panel2:  #252840;
    --accent:  #00d4aa;
    --accent2: #00b894;
    --text:    #e8eaf6;
    --muted:   #9fa8da;
    --border:  #3d4270;
    --danger:  #ff6b6b;
    --strava:  #fc4c02;
    --radius:  12px;
    --font:    'Segoe UI', system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Auth modal ── */
.modal-backdrop {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,0.65); backdrop-filter: blur(4px);
    z-index: 9000; align-items: center; justify-content: center;
}
.modal-backdrop.open { display: flex; }
.modal {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 16px; padding: 32px; width: 100%;
    max-width: 400px; margin: 16px; position: relative;
}
.modal-close {
    position: absolute; top: 16px; right: 16px;
    background: transparent; border: none; color: var(--muted);
    cursor: pointer; padding: 4px; line-height: 1;
    border-radius: 6px; transition: color 0.2s, background 0.2s;
}
.modal-close:hover { color: var(--text); background: var(--panel2); }
.modal-close svg { width: 18px; height: 18px; display: block; }
.modal-tabs {
    display: flex; gap: 4px; background: var(--panel2);
    border-radius: 8px; padding: 4px; margin-bottom: 28px;
}
.tab-btn {
    flex: 1; padding: 8px; background: transparent; border: none;
    border-radius: 6px; color: var(--muted); font-family: var(--font);
    font-size: 0.85rem; font-weight: 600; cursor: pointer;
    transition: background 0.18s, color 0.18s;
}
.tab-btn.active { background: var(--panel); color: var(--text); }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.auth-form.hidden { display: none; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
    font-size: 0.78rem; font-weight: 600; color: var(--muted);
    text-transform: uppercase; letter-spacing: 0.05em;
}
.form-group input {
    padding: 10px 14px; background: var(--panel2);
    border: 1px solid var(--border); border-radius: 8px;
    color: var(--text); font-family: var(--font); font-size: 0.9rem;
    outline: none; transition: border-color 0.2s;
}
.form-group input:focus { border-color: var(--accent); }
.form-group input::placeholder { color: #4a5080; }
.form-submit {
    margin-top: 4px; padding: 12px; background: var(--accent);
    color: #0f1117; border: none; border-radius: 8px;
    font-family: var(--font); font-size: 0.9rem; font-weight: 700;
    cursor: pointer; transition: background 0.2s, opacity 0.2s;
}
.form-submit:hover { background: var(--accent2); }
.form-submit:disabled { opacity: 0.6; cursor: not-allowed; }
.form-msg { font-size: 0.82rem; padding: 10px 14px; border-radius: 8px; display: none; }
.form-msg.show { display: block; }
.form-msg.error   { background: rgba(255,107,107,0.1); color: var(--danger); }
.form-msg.success { background: rgba(0,212,170,0.1);   color: var(--accent); }

/* ── Responsive global ── */
@media (max-width: 480px) {
    .modal { padding: 24px 20px; margin: 12px; border-radius: 14px; }
    .modal-tabs { margin-bottom: 20px; }
    .form-submit { padding: 11px; }
}