/* ===============================
   BASE
   =============================== */
:root {
    --btn-h-mobile: 56px;
    --btn-h-desktop: 48px;
    --btn-radius: 12px;
    --gap: 12px;

    --color-bg: #f4f6fb;
    --color-card: #ffffff;
    --color-btn: #e9eefb;
    --color-primary: #0078ff;
    --color-primary-text: #ffffff;
    --color-border: #ddd;
    --color-shadow: rgba(0,0,0,0.06);

    font-size: 16px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    background: var(--color-bg);
    color: #222;
}

/* ===============================
   TOPBAR
   =============================== */
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: #fff;
    box-shadow: 0 1px 4px var(--color-shadow);
    position: sticky;
    top: 0;
    z-index: 20;
}

/* ===============================
   LAYOUT
   =============================== */
.container {
    padding: 16px;
}

.card {
    background: var(--color-card);
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}

/* ===============================
   FORM ELEMENTS
   =============================== */
input,
textarea {
    width: 100%;
    padding: 12px;
    margin: 8px 0 14px 0;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 16px;
}

textarea {
    min-height: 80px;
    resize: vertical;
}

/* ===============================
   BUTTONS
   =============================== */
.btn {
    height: var(--btn-h-mobile);
    padding: 0 16px;
    border-radius: var(--btn-radius);
    border: 0;
    background: var(--color-btn);
    font-size: 18px;
    cursor: pointer;
    transition: transform 0.05s ease, background 0.2s ease;
}

/* tactile feedback */
.btn:active {
    transform: scale(0.97);
}

.btn:hover {
    background: #dce3f7;
}

.btn.primary {
    background: var(--color-primary);
    color: var(--color-primary-text);
}

.btn.primary:hover {
    background: #0066d9;
}

.btn.small {
    height: 40px;
    font-size: 15px;
    padding: 0 12px;
}

/* focus accessibility */
.btn:focus, input:focus, textarea:focus {
    outline: 3px solid rgba(0,123,255,0.35);
}

/* ===============================
   UTILITY
   =============================== */
.hidden {
    display: none !important;
}

.row {
    display: flex;
    flex-direction: column;
    gap: var(--gap);
}

/* ===============================
   MODAL
   =============================== */
.modal {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0,0,0,0.5);
    padding: 16px;
    z-index: 50;
}

.modal-body {
    width: 100%;
    max-width: 900px;
    background: #fff;
    padding: 16px;
    border-radius: 12px;
}

/* ===============================
   PRACTICA LIST
   =============================== */
#listaPracLeader .cardItem,
#listaPracUser .cardItem {
    padding: 14px;
    margin: 10px 0;
    border-radius: 10px;
    background: #f8fbff;
    border: 1px solid #dbe3f5;
    transition: background 0.15s ease;
}

.cardItem:hover {
    background: #eef4ff;
}

.cardItem button {
    margin-top: 10px;
}

/* ===============================
   RESPONSIVE
   =============================== */
@media (min-width: 900px) {
    :root {
        --btn-h-mobile: var(--btn-h-desktop);
    }

    .row {
        flex-direction: row;
    }

    .btn {
        font-size: 16px;
    }
}

.leader-menu {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 20px;
}

.menu-btn {
    width: 100%;
    text-align: left;
    padding: 14px;
    font-size: 18px;
    background: #eef3ff;
}

.menu-btn:hover {
    background: #dce6ff;
}

.leader-tab {
    padding: 10px 0;
}

#tareasContainer .tareaBox {
    padding: 10px;
    margin-bottom: 10px;
    background: #f7f9ff;
    border: 1px solid #d8dffd;
    border-radius: 8px;
}