:root {
    /* Die App hat noch keinen eigenen Dark Mode (siehe ROADMAP "Spätere Zyklen") -- ohne
       diese Angabe hat iOS Safari (u.a.) bei System-Dark-Mode eigenmächtig Farben
       "automatisch" angepasst und dabei den Kontrast der Karten/Buttons verschlechtert.
       Erzwingt stattdessen konsequent das tatsächlich unterstützte helle Design. */
    color-scheme: light;
    --color-primary: #2c7be5;
    --color-primary-dark: #1a68d1;
    --color-danger: #e74c3c;
    --color-danger-dark: #c0392b;
    --color-success: #1f9d55;
    --color-success-bg: #e6f7ec;
    --color-text: #333a45;
    --color-text-muted: #6b7280;
    --color-heading: #4a536e;
    --color-border: #e0e0e3;
    --color-nav-bg: #2f3947;
    --color-nav-bg-hover: #3b4656;
    --color-nav-text: #c1c4c8;
    --color-nav-text-hover: #eaebed;
    --color-page-bg: #f3f4f7;
    --color-card-bg: #ffffff;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.08), 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-modal: 0 20px 50px rgba(0, 0, 0, 0.25);
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --nav-height: 64px;
}

* {
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
}

html {
    font-size: 16px;
}

body {
    margin: 0;
    background-color: #435165;
    color: var(--color-text);
    line-height: 1.5;
}

a {
    color: var(--color-primary);
}

/* Lange, ungetrennte Strings (z. B. der Einladungslink als Fallback in invite_create.php)
   würden ihre Karte sonst auf schmalen Bildschirmen sprengen. */
code {
    word-break: break-all;
    overflow-wrap: anywhere;
}

/* Login / Registrierung */
.login,
.register {
    width: 400px;
    max-width: 92vw;
    background-color: var(--color-card-bg);
    box-shadow: 0 0 9px rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-md);
    margin: 60px auto;
    overflow: hidden;
}

.login h1,
.register h1 {
    text-align: center;
    color: var(--color-heading);
    font-size: 24px;
    padding: 20px 0;
    margin: 0;
    border-bottom: 1px solid var(--color-border);
}

.login form,
.register form {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    padding-top: 20px;
}

.login form label,
.register form label {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    background-color: var(--color-primary);
    color: #ffffff;
    flex-shrink: 0;
}

.login form input[type="text"],
.login form input[type="password"],
.register form input[type="text"],
.register form input[type="password"],
.register form input[type="email"] {
    width: 310px;
    max-width: calc(100% - 90px);
    height: 50px;
    border: 1px solid var(--color-border);
    margin-bottom: 20px;
    padding: 0 15px;
    font-size: 1rem;
}

.login form input[type="submit"],
.register form input[type="submit"] {
    width: 100%;
    padding: 15px;
    margin-top: 20px;
    background-color: var(--color-primary);
    border: 0;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    color: #ffffff;
    transition: background-color 0.2s;
}

.login form input[type="submit"]:hover,
.register form input[type="submit"]:hover {
    background-color: var(--color-primary-dark);
}

/* Eingeloggter Bereich */
body.loggedin {
    background-color: var(--color-page-bg);
}

/* Top Navigation */
.navtop {
    background-color: var(--color-nav-bg);
    width: 100%;
    border: 0;
}

.nav-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    width: 1200px;
    max-width: 100%;
    min-height: var(--nav-height);
    margin: 0 auto;
    padding: 0 var(--space-5);
    gap: var(--space-4);
}

.nav-container h1 {
    flex: 0 0 auto;
    font-size: 24px;
    margin: 0;
    color: var(--color-nav-text-hover);
    font-weight: normal;
    white-space: nowrap;
}

/* Hauptmenü */
.menu {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    margin: 0;
    padding: 0;
    flex: 1;
}

.menu > li {
    position: relative;
}

.menu > li > a {
    display: flex;
    align-items: center;
    height: var(--nav-height);
    padding: 0 var(--space-4);
    text-decoration: none;
    color: var(--color-nav-text);
    font-weight: bold;
    font-size: 0.95rem;
    white-space: nowrap;
    transition: 0.15s ease;
}

.menu > li > a:hover,
.menu > li > a:focus {
    color: var(--color-nav-text-hover);
    background-color: var(--color-nav-bg-hover);
}

.menu > li > a i {
    margin-left: 8px;
    font-size: 12px;
}

/* Untermenü */
.submenu {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    min-width: 220px;
    background-color: var(--color-card-bg);
    list-style: none;
    margin: 0;
    padding: 8px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    z-index: 999;
}

.submenu li a {
    display: block;
    padding: 12px 18px;
    text-decoration: none;
    color: var(--color-heading);
    font-weight: normal;
    white-space: nowrap;
    transition: 0.2s ease;
}

.submenu li a:hover,
.submenu li a:focus {
    background-color: #f1f4f8;
    color: var(--color-primary);
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu {
    display: block;
}

/* Rechter Bereich */
.nav-right {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.nav-right a {
    display: inline-flex;
    align-items: center;
    height: var(--nav-height);
    padding: 0 var(--space-4);
    text-decoration: none;
    color: var(--color-nav-text);
    font-weight: bold;
    font-size: 0.95rem;
    white-space: nowrap;
    transition: 0.15s ease;
}

.nav-right a i {
    padding: 2px 8px 0 0;
}

.nav-right a:hover,
.nav-right a:focus {
    color: var(--color-nav-text-hover);
    background-color: var(--color-nav-bg-hover);
}

.logo {
    flex: 0 0 auto;
    font-size: 22px;
    margin: 0;
    color: var(--color-nav-text-hover);
    font-weight: 600;
    white-space: nowrap;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    height: var(--nav-height);
}

.logo:hover,
.logo:focus {
    color: #ffffff;
}

/* Burgermenü (Mobile) -- auf Desktop unsichtbar, .nav-drawer verhält sich dort wie
   der frühere direkte .menu/.nav-right-Inhalt von .nav-container. */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--color-nav-text);
    font-size: 22px;
    cursor: pointer;
    padding: var(--space-2);
    flex: 0 0 auto;
}

.nav-toggle:hover,
.nav-toggle:focus {
    color: var(--color-nav-text-hover);
}

.nav-drawer {
    display: flex;
    align-items: center;
    flex: 1;
    flex-wrap: wrap;
    gap: var(--space-4);
}

.nav-overlay {
    display: none;
}

/* Inhalt */
.content {
    width: 1000px;
    max-width: 100%;
    margin: 0 auto;
    padding: var(--space-5) var(--space-5) var(--space-6);
}

.content h2 {
    margin: 0;
    padding: var(--space-2) 0 var(--space-5);
    font-size: 1.5rem;
    color: var(--color-heading);
}

.content h3 {
    margin: 0 0 var(--space-3);
    font-size: 1.15rem;
    color: var(--color-heading);
}

.content > p,
.content > div {
    box-shadow: var(--shadow-card);
    border-radius: var(--radius-md);
    margin: var(--space-5) 0;
    padding: var(--space-5);
    background-color: var(--color-card-bg);
}

.content > p table td,
.content > div table td {
    padding: 5px;
}

.content > p table td:first-child,
.content > div table td:first-child {
    font-weight: bold;
    color: var(--color-heading);
    padding-right: 15px;
}

.content > div p {
    padding: 5px;
    margin: 0 0 10px 0;
}

/* Admin-Unternavigation (Konten/Einladungen/Standard-Übungen/Muskelgruppen) */
.admin-subnav {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    width: 1000px;
    max-width: 100%;
    margin: var(--space-4) auto 0;
    padding: 0 var(--space-5);
}

.admin-subnav a {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background-color: var(--color-card-bg);
    box-shadow: var(--shadow-card);
    text-decoration: none;
    color: var(--color-heading);
    font-weight: bold;
    font-size: 0.9rem;
    white-space: nowrap;
}

.admin-subnav a:hover,
.admin-subnav a:focus {
    color: var(--color-primary);
}

.admin-subnav a.active {
    background-color: var(--color-primary);
    color: #fff;
}

/* Aktionsleiste (Buttons oberhalb von Listen) */
.action-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin: var(--space-5) 0;
}

/* Tabellen */
.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.workouts-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.workouts-table th,
.workouts-table td {
    padding: var(--space-3) var(--space-3);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.workouts-table th {
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.workouts-table tbody tr:hover {
    background-color: #f8f9fb;
}

.workouts-table a {
    color: var(--color-primary);
    font-weight: 600;
    text-decoration: none;
}

.workouts-table a:hover {
    text-decoration: underline;
}

/* .open-btn/.close-btn als <a> in einer Tabellenzeile (z. B. "Übungen verwalten") --
   .workouts-table a ist spezifischer als .open-btn und würde sonst dessen weiße
   Schrift durch die Primärfarbe ersetzen, was auf dem gleichfarbigen Button-Hintergrund
   unlesbar wird. */
.workouts-table .open-btn,
.workouts-table .close-btn {
    color: #fff;
}

.workouts-table .open-btn:hover,
.workouts-table .close-btn:hover {
    text-decoration: none;
}

/* Status-Badges (Geplant / Absolviert / Erledigt) */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    white-space: nowrap;
    background-color: #eef0f3;
    color: var(--color-text-muted);
}

.badge-done {
    background-color: var(--color-success-bg);
    color: var(--color-success);
}

/* Übungsbeschreibung (korrekte Ausführung, Dehnübungen) */
.exercise-description {
    display: block;
    font-size: 0.85rem;
    font-weight: normal;
    color: var(--color-text-muted);
    white-space: normal;
}

.exercise-description-details {
    margin: var(--space-2) 0 var(--space-3);
}

.exercise-description-details summary {
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--color-primary);
}

/* Übungs-Karten (Wrapper statt Direktkind von .content, wegen Drag & Drop, Zyklus 16) --
   #exercisesList selbst bleibt unsichtbar, jede .exercise-card trägt die frühere
   .content > div-Kartenoptik einzeln. */
#exercisesList {
    box-shadow: none;
    background: none;
    padding: 0;
    margin: 0;
}

.exercise-card {
    box-shadow: var(--shadow-card);
    border-radius: var(--radius-md);
    margin: var(--space-5) 0;
    padding: var(--space-5);
    background-color: var(--color-card-bg);
}

.exercise-drag-handle {
    display: inline-flex;
    align-items: center;
    cursor: grab;
    touch-action: none;
    color: var(--color-text-muted);
    font-size: 1.1rem;
    padding: var(--space-2);
    margin: calc(var(--space-2) * -1) 0 calc(var(--space-2) * -1) calc(var(--space-2) * -1);
}

.exercise-card.dragging {
    opacity: 0.6;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

/* Live-Workout-Tracking (workout_session.php, Zyklus 16) */
.session-progress {
    font-weight: 600;
    color: var(--color-text-muted);
}

.session-next-preview {
    color: var(--color-text-muted);
}

.session-jumplist {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.session-jumplist li a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    background-color: var(--color-card-bg);
    box-shadow: var(--shadow-card);
    text-decoration: none;
    color: var(--color-heading);
}

.session-jumplist li.active a {
    outline: 2px solid var(--color-primary);
}

.jumplist-badge {
    flex: 0 0 auto;
}

/* Formulare */
.form-group {
    margin-bottom: var(--space-4);
    width: 100%;
}

.form-group label {
    display: block;
    margin-bottom: var(--space-1);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-heading);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="email"],
.form-group input[type="datetime-local"],
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background-color: #fff;
}

.form-group input:focus,
.form-group select:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2) var(--space-4);
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-weight: normal;
    font-size: 0.9rem;
    color: inherit;
    margin-bottom: 0;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
}

/* Größere Tap-Targets für Checkboxen auf Touchscreens -- ein natives Checkbox-Icon ist mit
   ca. 13-16px auf dem Handy schwer zuverlässig zu treffen, besonders das "Erledigt"-Set-Häkchen
   beim Tracken im Fitnessstudio (häufigste Interaktion dort). */
.set-done-checkbox,
.checkbox-group input[type="checkbox"] {
    width: 22px;
    height: 22px;
    cursor: pointer;
}

.form-actions {
    margin-top: var(--space-4);
}

.save-btn {
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: #fff;
    cursor: pointer;
    transition: background-color 0.15s;
}

.save-btn:hover {
    background: var(--color-primary-dark);
}

.form-feedback {
    min-height: 1.2em;
    margin-top: var(--space-3);
    font-size: 0.9rem;
}

.form-feedback.success {
    color: var(--color-success);
}

.form-feedback.error {
    color: var(--color-danger);
}

/* Buttons / Modals */
.open-btn {
    padding: 10px 18px;
    font-size: 0.95rem;
    font-weight: bold;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-primary);
    color: #fff;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    transition: background-color 0.15s;
}

.open-btn:hover {
    background: var(--color-primary-dark);
}

dialog.modal-window {
    width: min(600px, 92vw);
    max-height: 90vh;
    border: none;
    border-radius: var(--radius-lg);
    padding: 0;
    box-shadow: var(--shadow-modal);
}

dialog.modal-window::backdrop {
    background: rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-5);
    background: #f3f3f3;
    border-bottom: 1px solid #ddd;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--color-heading);
}

.close-btn {
    border: none;
    background: var(--color-danger);
    color: #fff;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.15s;
}

.close-btn:hover {
    background: var(--color-danger-dark);
}

.modal-body {
    padding: var(--space-5);
    line-height: 1.6;
    overflow-y: auto;
}

/* Responsive: Tablet */
@media (max-width: 768px) {
    :root {
        --nav-height: 56px;
    }

    .content {
        padding: var(--space-4) var(--space-4) var(--space-5);
    }

    .content > p,
    .content > div,
    .exercise-card {
        padding: var(--space-4);
        margin: var(--space-4) 0;
    }

    .admin-subnav {
        padding: 0 var(--space-4);
    }

    .content h2 {
        font-size: 1.3rem;
    }

    .nav-container {
        padding: 0 var(--space-3);
        gap: var(--space-2);
    }

    .menu > li > a,
    .nav-right a {
        padding: 0 var(--space-3);
        font-size: 0.88rem;
    }

    /* z-index deutlich über .nav-overlay (150): .navtop bekommt hier durch
       position:sticky einen eigenen Stacking-Context -- .nav-drawer (z-index 200) ist ein
       Nachfahre und daher darin gefangen, nach außen zählt nur noch .navtops eigener
       z-index. War der niedriger als .nav-overlay, landete das Overlay trotz declared
       z-index:200 am Menü sichtbar darüber und schluckte Taps auf die Links (schloss nur
       das Menü, ohne zu navigieren). */
    .navtop {
        position: sticky;
        top: 0;
        z-index: 250;
    }

    .nav-container {
        justify-content: space-between;
    }

    .nav-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .nav-drawer {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        width: min(280px, 80vw);
        background-color: var(--color-nav-bg);
        flex-direction: column;
        align-items: stretch;
        flex-wrap: nowrap;
        gap: 0;
        padding: var(--space-6) 0 var(--space-4);
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        z-index: 200;
        overflow-y: auto;
    }

    .nav-drawer.open {
        transform: translateX(0);
    }

    .nav-drawer .menu {
        flex-direction: column;
        width: 100%;
    }

    .nav-drawer .menu > li {
        width: 100%;
    }

    .nav-drawer .menu > li > a {
        height: auto;
        padding: var(--space-3) var(--space-5);
        justify-content: flex-start;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .nav-drawer .submenu {
        position: static;
        box-shadow: none;
        border-radius: 0;
    }

    .nav-drawer .nav-right {
        flex-direction: column;
        width: 100%;
        margin-top: var(--space-3);
        padding-top: var(--space-3);
        border-top: 1px solid rgba(255, 255, 255, 0.15);
    }

    .nav-drawer .nav-right a {
        height: auto;
        width: 100%;
        justify-content: flex-start;
        padding: var(--space-3) var(--space-5);
    }

    .nav-overlay.open {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 150;
    }
}

/* Responsive: Mobile */
@media (max-width: 520px) {
    .login,
    .register {
        margin: 24px auto;
    }

    .nav-container {
        padding: var(--space-2) var(--space-3);
        min-height: 48px;
    }

    .logo {
        height: 44px;
    }

    .action-bar {
        flex-direction: column;
    }

    .action-bar .open-btn,
    .action-bar .close-btn {
        width: 100%;
        justify-content: center;
    }

    .workouts-table {
        font-size: 0.88rem;
    }

    dialog.modal-window {
        width: 100vw;
        max-width: 100vw;
        height: 100%;
        max-height: 100vh;
        border-radius: 0;
        margin: 0;
    }
}