/* ===========================
   GLOBAL STYLES & RESET
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4CAF50;
    --primary-dark: #45a049;
    --secondary-color: #2196F3;
    --secondary-dark: #1976D2;
    --danger-color: #f44336;
    --danger-dark: #d32f2f;
    --text-color: #333;
    --text-light: #666;
    --border-color: #ddd;
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 8px rgba(0,0,0,0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* ===========================
   LAYOUT
   =========================== */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* ===========================
   AUTH SCREEN
   =========================== */
#auth-screen {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.auth-container {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
    margin: 20px;
}

.auth-container h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
    font-size: 2rem;
}

.auth-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: var(--bg-color);
    color: var(--text-color);
    cursor: pointer;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s;
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.auth-form h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.auth-form input {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.error-message {
    color: var(--danger-color);
    font-size: 0.9rem;
    margin-top: 10px;
    min-height: 20px;
}

/* ===========================
   NAVIGATION
   =========================== */
.main-nav {
    background: var(--card-bg);
    padding: 12px 20px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    gap: 15px;
}

.nav-brand {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-color);
    flex-shrink: 0;
}

/* Mobile Menu Toggle (Hamburger) */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
    order: 2;
}

.hamburger-line {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
    transition: all 0.3s;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

.nav-menu {
    display: flex;
    gap: 8px;
    flex: 1;
    justify-content: center;
}

.nav-btn {
    padding: 10px 16px;
    border: none;
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: all 0.3s;
    white-space: nowrap;
}

.nav-btn:hover {
    background: var(--bg-color);
}

.nav-btn.active {
    background: var(--primary-color);
    color: white;
}

.btn-logout {
    background: var(--danger-color);
    color: white;
    padding: 8px 16px;
    font-size: 0.9rem;
    flex-shrink: 0;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

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

/* ===========================
   BUTTONS
   =========================== */
.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: var(--secondary-dark);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

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

.btn-icon {
    padding: 8px 12px;
    font-size: 1.2rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* ===========================
   PAGES
   =========================== */
.page {
    display: none;
    min-height: calc(100vh - 80px);
}

.page.active {
    display: block;
}

.page h1 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

/* ===========================
   CARDS & INFO BOXES
   =========================== */
.info-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.info-card h3, .info-card h4 {
    margin-bottom: 10px;
    color: var(--primary-color);
}

/* ===========================
   DATE SELECTOR
   =========================== */
.date-selector {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.date-input {
    flex: 1;
    min-width: 200px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

/* ===========================
   EXERCISES LIST
   =========================== */
.exercises-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.exercise-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.exercise-card:hover {
    box-shadow: var(--shadow-hover);
}

/* Neue kompakte Übungskachel */
.exercise-header-new {
    margin-bottom: 12px;
}

.exercise-name {
    color: var(--primary-color);
    margin: 0 0 8px 0;
    font-size: 1.2rem;
}

.exercise-description {
    margin-bottom: 12px;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.4;
}

.exercise-stats {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 15px;
    padding: 12px;
    background: var(--bg-color);
    border-radius: 8px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.stat-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

.stat-text {
    font-size: 0.95rem;
    color: var(--text-color);
    font-weight: 500;
}

.exercise-actions-compact {
    display: flex;
    gap: 8px;
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9rem;
    flex: 1;
}

.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.exercise-title {
    flex: 1;
}

.exercise-title h3 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.exercise-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--secondary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-top: 5px;
}

.exercise-actions {
    display: flex;
    gap: 10px;
}

.exercise-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 15px;
}

.detail-item {
    display: flex;
    flex-direction: column;
}

.detail-label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 5px;
}

.detail-value {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--text-color);
}

.max-weight-badge {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: bold;
    display: inline-block;
}

/* ===========================
   EXERCISES GRID (Management)
   =========================== */
.exercises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

/* ===========================
   FILTER SECTION
   =========================== */
.filter-section {
    margin: 20px 0;
}

.form-select {
    width: 100%;
    max-width: 300px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: white;
}

/* ===========================
   PLANS GRID
   =========================== */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.plan-card {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.plan-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.weekdays-display {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
    margin: 10px 0;
}

.weekday-badge {
    padding: 4px 10px;
    background: var(--secondary-color);
    color: white;
    border-radius: 15px;
    font-size: 0.85rem;
}

.plan-exercises-preview {
    margin: 15px 0;
}

.plan-exercises-preview ul {
    list-style: none;
    padding: 0;
}

.plan-exercises-preview li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.plan-exercises-preview li:last-child {
    border-bottom: none;
}

.plan-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

/* ===========================
   ROTATION SECTION
   =========================== */
.training-exercise-header {
    margin-bottom: 12px;
}

.training-plan-stats {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin-bottom: 15px;
    padding: 12px;
    background: var(--bg-color);
    border-radius: 8px;
}

.plan-stat-item {
    font-size: 0.95rem;
    color: var(--text-color);
    font-weight: 500;
}

.last-training-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 6px;
    margin-bottom: 12px;
    border-left: 3px solid var(--secondary-color);
}

.last-training-label {
    font-size: 0.75rem;
    color: #666;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.last-training-values {
    font-size: 0.85rem;
    color: var(--text-color);
    font-weight: 600;
}

.superset-training-card {
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    padding: 12px;
    background: linear-gradient(to right, rgba(76, 175, 80, 0.05), transparent);
    margin-bottom: 20px;
}

.superset-training-header {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1rem;
}

.superset-training-card .exercise-card {
    margin-bottom: 10px;
    border-left: 3px solid var(--primary-color);
}

.superset-training-card .exercise-card:last-child {
    margin-bottom: 0;
}

.btn-log {
    width: 100%;
    margin-top: 15px;
}

.exercise-card.completed {
    opacity: 0.85;
    border-left: 4px solid var(--primary-color);
    background: linear-gradient(to right, rgba(76, 175, 80, 0.05), var(--card-bg));
}

.completed-badge {
    background: var(--primary-color);
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
    display: inline-block;
}

.draft-badge {
    background: var(--secondary-color);
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
    display: inline-block;
}

.manual-badge {
    background: #FF9800;
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
    display: inline-block;
    margin-left: 8px;
}

/* ===========================
   ROTATION SECTION
   =========================== */
.rotation-section-wrapper {
    margin-top: 50px;
}

.section-divider {
    height: 2px;
    background: linear-gradient(to right, transparent, var(--border-color), transparent);
    margin: 40px 0 30px 0;
}

.rotation-section {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--secondary-color);
}

.rotation-header {
    margin-bottom: 20px;
}

.rotation-header h2 {
    margin: 0 0 8px 0;
    color: var(--secondary-color);
    font-size: 1.5rem;
}

.rotation-description {
    color: var(--text-light);
    font-size: 0.95rem;
    margin: 0;
}

.rotation-info-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    border-left: 3px solid var(--primary-color);
}

.rotation-info-card h4 {
    color: var(--primary-color);
    margin-bottom: 12px;
}

.rotation-info-card p {
    margin: 8px 0;
    color: var(--text-color);
}

.rotation-info-card p strong {
    color: var(--text-color);
    font-weight: 600;
}

/* ===========================
   STATISTICS
   =========================== */
.stats-filters {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.filter-group label {
    font-weight: 500;
    color: var(--text-color);
}

.overall-stats {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.overall-stats h2 {
    margin-bottom: 20px;
    color: var(--text-color);
}

.overall-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    color: white;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.form-input {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

.stats-charts {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.chart-container {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.chart-container h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.stats-summary {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-top: 30px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 15px;
}

.stat-box {
    text-align: center;
    padding: 20px;
    background: var(--bg-color);
    border-radius: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 5px;
}

/* ===========================
   MODALS
   =========================== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
}

.modal.active {
    display: block;
}

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto;
    padding: 30px;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 85vh;
    overflow-y: auto;
    overflow-x: hidden;
    position: relative;
}

.modal-content form {
    width: 100%;
    overflow-x: hidden;
}

.modal-content input,
.modal-content select,
.modal-content textarea {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

.close {
    color: var(--text-light);
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: var(--text-color);
}

.modal-content h2 {
    margin-bottom: 20px;
    color: var(--primary-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.form-input, .form-select, textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
}

textarea {
    resize: vertical;
}

.weekday-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: 10px;
}

.weekday-selector label {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 8px;
    background: var(--bg-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.weekday-selector label:hover {
    background: var(--primary-color);
    color: white;
}

.weekday-selector input[type="checkbox"]:checked + label,
.weekday-selector label:has(input[type="checkbox"]:checked) {
    background: var(--primary-color);
    color: white;
}

.modal-actions {
    display: flex;
    gap: 10px;
    margin-top: 30px;
    justify-content: flex-end;
}

/* ===========================
   SETS INPUTS (Training Log)
   =========================== */
#sets-inputs {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
}

.set-input-row {
    display: grid;
    grid-template-columns: auto 1fr 1fr auto;
    gap: 10px;
    align-items: center;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 8px;
}

.set-input-row-simple {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 10px;
    align-items: center;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 8px;
}

.set-label {
    font-weight: bold;
    min-width: 70px;
}

.set-input-row input,
.set-input-row-simple input {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.remove-set {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
}

/* ===========================
   PREVIOUS LOGS
   =========================== */
#previous-logs-content {
    max-height: 200px;
    overflow-y: auto;
}

.previous-log-item {
    padding: 10px;
    background: var(--bg-color);
    border-radius: 8px;
    margin-bottom: 10px;
}

.previous-log-item:last-child {
    margin-bottom: 0;
}

.log-date {
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.log-sets {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* ===========================
   PLAN EXERCISES LIST (in Modal)
   =========================== */
#plan-exercises-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
}

.plan-exercise-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.plan-exercise-item {
    display: grid;
    grid-template-columns: auto 2fr 1fr 1fr 1fr auto;
    gap: 10px;
    align-items: center;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 8px;
    cursor: move;
}

.plan-exercise-item.dragging {
    opacity: 0.4;
}

.drag-handle {
    cursor: grab;
    color: #999;
    font-size: 1.2rem;
    user-select: none;
    padding: 0 5px;
}

.drag-handle:active {
    cursor: grabbing;
}

.superset-container {
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    padding: 12px;
    background: linear-gradient(to right, rgba(76, 175, 80, 0.05), transparent);
    margin-bottom: 10px;
    cursor: move;
}

.superset-container.dragging {
    opacity: 0.4;
}

.superset-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--primary-color);
    gap: 10px;
}

.superset-header .drag-handle {
    font-size: 1.5rem;
    cursor: grab;
}

.superset-header .drag-handle:active {
    cursor: grabbing;
}

.superset-title {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.superset-exercises {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.plan-exercise-item select,
.plan-exercise-item input {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
}

.remove-exercise {
    background: var(--danger-color);
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
}

/* ===========================
   LOADING SPINNER
   =========================== */
.spinner {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner-icon {
    border: 5px solid var(--bg-color);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ===========================
   RESPONSIVE DESIGN
   =========================== */
@media (max-width: 768px) {
    .auth-container {
        padding: 30px 20px;
    }
    
    /* Mobile Navigation */
    .main-nav {
        padding: 10px 15px;
        flex-wrap: nowrap !important;
        flex-direction: row !important;
        align-items: center !important;
    }
    
    .nav-brand {
        font-size: 1.2rem;
        order: 1;
    }
    
    .mobile-menu-toggle {
        display: flex !important;
        order: 2;
    }
    
    .btn-logout {
        order: 3;
        padding: 6px 12px;
        font-size: 0.85rem;
    }
    
    .nav-menu {
        display: none !important;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--card-bg);
        box-shadow: var(--shadow);
        flex-direction: column !important;
        gap: 0 !important;
        padding: 10px 0;
        z-index: 1000;
        order: 4;
        flex: none !important;
    }
    
    .nav-menu.active {
        display: flex !important;
    }
    
    .nav-btn {
        width: 100%;
        text-align: left;
        padding: 14px 20px;
        border-radius: 0;
        font-size: 1rem;
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-btn:last-child {
        border-bottom: none;
    }
    
    .container {
        padding: 15px;
    }
    
    .exercises-grid,
    .plans-grid {
        grid-template-columns: 1fr;
    }
    
    .exercise-details {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .plan-exercise-item {
        grid-template-columns: 1fr;
    }
    
    .set-input-row {
        grid-template-columns: 1fr;
    }
    
    .stats-filters {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
        padding: 20px 15px;
        max-height: 90vh;
    }
    
    .modal-content h2 {
        font-size: 1.3rem;
    }
    
    .form-group {
        margin-bottom: 15px;
    }
    
    .modal-actions {
        flex-direction: column;
        gap: 8px;
    }
    
    .modal-actions .btn {
        width: 100%;
    }
    
    .weekday-selector {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .exercise-actions {
        flex-direction: column;
    }

    .plan-actions {
        flex-direction: column;
    }
    
    /* Date Selector auf Tablets */
    .date-selector {
        flex-wrap: nowrap;
    }
    
    .date-input {
        min-width: 150px;
    }
}

@media (max-width: 480px) {
    .date-selector {
        display: grid;
        grid-template-columns: auto 1fr auto auto;
        gap: 8px;
        align-items: center;
    }
    
    .date-input {
        width: 100%;
        min-width: 120px;
    }
    
    #prev-day, #next-day {
        padding: 8px 10px;
        font-size: 1rem;
    }
    
    #today-btn {
        padding: 8px 12px;
        font-size: 0.85rem;
    }
    
    .exercise-actions {
        flex-direction: column;
    }
    
    .plan-actions {
        flex-direction: column;
    }
    
    .weekday-selector {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ===========================
   UTILITY CLASSES
   =========================== */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none !important;
}

.success-message {
    color: var(--primary-color);
    background: #e8f5e9;
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-light);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}