/* ==================== Modern Design System ==================== */

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f5576c;
    --success-color: #00f2fe;
    --warning-color: #fee140;

    --text-primary: #1a1a1a;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --text-white: #ffffff;

    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-overlay: rgba(255, 255, 255, 0.1);
    --border-color: #e2e8f0;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-secondary);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== Login Page ==================== */

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="75" cy="75" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="50" cy="10" r="0.5" fill="rgba(255,255,255,0.15)"/><circle cx="90" cy="40" r="0.5" fill="rgba(255,255,255,0.15)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.login-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 420px;
    padding: 48px 40px;
    position: relative;
    z-index: 1;
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-card h1 {
    text-align: center;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    font-size: 2.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
}

.login-card .subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.1rem;
    font-weight: 500;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    letter-spacing: 0.01em;
}

.form-group input {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    background: white;
    transform: translateY(-1px);
}

.form-group input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.btn-primary {
    width: 100%;
    padding: 16px 24px;
    background: var(--primary-gradient);
    color: white;
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    letter-spacing: 0.02em;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary:active {
    transform: translateY(0);
}

.demo-info {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: var(--border-radius-lg);
    padding: 20px;
    margin-top: 32px;
    backdrop-filter: blur(10px);
}

.demo-info p {
    margin: 6px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.demo-info strong {
    color: var(--primary-color);
}

.error-message {
    color: #ef4444;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), rgba(239, 68, 68, 0.05));
    border: 1px solid rgba(239, 68, 68, 0.2);
    padding: 16px 20px;
    border-radius: var(--border-radius-md);
    margin-top: 24px;
    display: none;
    text-align: center;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

/* ==================== Dashboard Layout ==================== */

.container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
}

.navbar {
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(10px);
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-content h2 {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-content > div {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-content > div span {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid rgba(0, 0, 0, 0.1);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn-secondary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.05), transparent);
    transition: left 0.5s;
}

.btn-secondary:hover::before {
    left: 100%;
}

.btn-secondary:hover {
    background: var(--bg-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 0, 0, 0.15);
}

.btn-danger {
    background: transparent;
    color: var(--danger-color, #e53e3e);
    border: 1px solid var(--danger-color, #e53e3e);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-normal);
}

.btn-danger:hover {
    background: var(--danger-color, #e53e3e);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-small {
    font-size: 0.9rem;
    padding: 10px 16px;
}

.main-content {
    display: flex;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px;
    gap: 32px;
    flex: 1;
}

.sidebar {
    width: 280px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    height: fit-content;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.sidebar-tab-header {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 22px;
}

.sidebar-note {
    font-size: 0.95rem;
    color: var(--text-secondary);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    padding-top: 20px;
    margin-top: 12px;
}

.subtitle.small {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 6px;
}

.full-width {
    grid-column: 1 / -1;
}

.exercise-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-tertiary);
    overflow: hidden;
    border-radius: var(--border-radius-md);
}

.exercise-table th,
.exercise-table td {
    padding: 18px 16px;
    text-align: left;
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
}

.exercise-table th {
    background: rgba(102, 126, 234, 0.08);
    color: var(--primary-color);
    font-weight: 700;
}

.exercise-table tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

.no-activities {
    color: var(--text-secondary);
    font-size: 1rem;
    text-align: center;
    padding: 24px 0;
}

.sidebar-tab {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 14px 16px;
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: left;
}

.sidebar-tab:hover,
.sidebar-tab.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    box-shadow: var(--shadow-sm);
}

.sidebar h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.students-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.exercise-view {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.exercise-card {
    padding: 16px 18px;
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(0, 0, 0, 0.08);
    background: var(--bg-tertiary);
    box-shadow: var(--shadow-sm);
}

.sidebar-section-title {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 14px;
    border-radius: var(--border-radius-md);
    background: rgba(102, 126, 234, 0.08);
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 8px;
}

.exercise-name {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.exercise-fullname {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.exercise-muscles {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
}

.student-item {
    padding: 16px 20px;
    background: var(--bg-tertiary);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.student-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-gradient);
    transform: scaleY(0);
    transition: transform var(--transition-normal);
}

.student-item:hover {
    background: var(--bg-primary);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 0, 0, 0.1);
}

.student-item:hover::before {
    transform: scaleY(1);
}

.student-item.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    transform: translateX(4px);
    box-shadow: var(--shadow-lg);
}

.student-item.active::before {
    background: rgba(255, 255, 255, 0.3);
    transform: scaleY(1);
}

.dashboard-content {
    flex: 1;
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.dashboard-content.full-width {
    grid-column: 1 / -1;
}

.header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.header-section h2,
.header-section h3 {
    color: var(--text-primary);
    font-weight: 700;
    font-size: 1.8rem;
    letter-spacing: -0.02em;
}

.empty-state {
    text-align: center;
    padding: 80px 40px;
    color: var(--text-muted);
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    border-radius: var(--border-radius-lg);
    border: 2px dashed rgba(0, 0, 0, 0.1);
}

.empty-state h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* ==================== Add Activity Form ==================== */

.add-activity-form {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    border: 2px solid rgba(0, 0, 0, 0.05);
    border-radius: var(--border-radius-lg);
    padding: 32px;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
}

.add-activity-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.add-activity-form h3 {
    margin-bottom: 24px;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    letter-spacing: 0.01em;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    background: var(--bg-primary);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.form-group input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.form-actions {
    display: flex;
    gap: 16px;
    margin-top: 32px;
    justify-content: flex-end;
}

.form-actions button {
    flex: 0 0 auto;
    padding: 14px 24px;
    border: none;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-width: 120px;
}

.form-actions .btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.form-actions .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.form-actions .btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.form-actions .btn-secondary:hover {
    background: var(--bg-primary);
    border-color: rgba(0, 0, 0, 0.15);
}

/* ==================== Activities List ==================== */

.activities-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.activity-card {
    background: var(--bg-primary);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.activity-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.activity-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(0, 0, 0, 0.1);
}

.activity-card:hover::before {
    opacity: 1;
}

.activity-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.activity-header h4 {
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin: 0;
}

.activity-meta {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 12px;
}

.activity-meta::before {
    content: '📅';
    font-size: 1rem;
}

.activity-details {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    align-items: center;
}

.activity-details span {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 6px;
}

.activity-details span::before {
    font-size: 1.2rem;
}

.activity-details span:nth-child(1)::before { content: '🏋️'; }
.activity-details span:nth-child(2)::before { content: '⚖️'; }
.activity-details span:nth-child(3)::before { content: '🔢'; }

.activity-details strong {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.1rem;
}

.activity-actions {
    margin-top: 16px;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.activity-actions button {
    padding: 8px 16px;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.activity-actions .btn-edit {
    background: var(--warning-gradient);
    color: white;
}

.activity-actions .btn-edit:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.activity-actions .btn-delete {
    background: linear-gradient(135deg, #ff6b6b, #ee5a52);
    color: white;
}

.activity-actions .btn-delete:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.no-activities {
    text-align: center;
    color: var(--text-muted);
    padding: 80px 40px;
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    border-radius: var(--border-radius-lg);
    border: 2px dashed rgba(0, 0, 0, 0.1);
}

.no-activities h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-secondary);
}

.no-activities p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* ==================== Responsive Design ==================== */

@media (max-width: 1024px) {
    .main-content {
        gap: 24px;
    }

    .sidebar {
        width: 260px;
    }

    .dashboard-content {
        padding: 32px;
    }
}

@media (max-width: 768px) {
    .nav-content {
        padding: 0 16px;
    }

    .nav-content h2 {
        font-size: 1.5rem;
    }

    .main-content {
        flex-direction: column;
        padding: 24px 16px;
        gap: 24px;
    }

    .sidebar {
        width: 100%;
        order: 2;
    }

    .dashboard-content {
        padding: 24px;
        order: 1;
    }

    .header-section {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
        margin-bottom: 32px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .activity-details {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .activity-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 32px 24px;
        margin: 16px;
    }

    .login-card h1 {
        font-size: 2.4rem;
    }

    .dashboard-content {
        padding: 20px;
    }

    .add-activity-form {
        padding: 24px;
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions button {
        width: 100%;
    }

    .activity-actions {
        flex-direction: column;
        gap: 8px;
    }

    .activity-actions button {
        width: 100%;
    }
}

/* ==================== Animations & Effects ==================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

.pulse {
    animation: pulse 2s infinite;
}

/* ==================== Loading States ==================== */

.loading {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
}

.loading::after {
    content: '';
    width: 16px;
    height: 16px;
    border: 2px solid var(--text-muted);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ==================== Utility Classes ==================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.hidden { display: none !important; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }

/* ==================== Activities Table ==================== */

.table-container {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    margin-top: 20px;
}

.activities-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.activities-table thead {
    background: var(--primary-gradient);
    color: var(--text-white);
}

.activities-table th {
    padding: 16px 12px;
    text-align: left;
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.activities-table td {
    padding: 14px 12px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    vertical-align: middle;
}

.activities-table tbody tr:hover {
    background: var(--bg-secondary);
    transition: background var(--transition-fast);
}

.activities-table tbody tr:last-child td {
    border-bottom: none;
}

.loading, .no-activities {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: 40px;
}

/* ==================== Sets Form ==================== */

.sets-section {
    margin-top: 24px;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.sets-section h4 {
    margin-bottom: 16px;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
}

.set-row {
    display: flex;
    align-items: end;
    gap: 16px;
    margin-bottom: 16px;
    padding: 16px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.set-row .form-group {
    flex: 1;
    margin-bottom: 0;
}

.set-row .form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.set-row .form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius-sm);
    font-size: 0.95rem;
    transition: border var(--transition-fast);
}

.set-row .form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.remove-set {
    align-self: end;
    margin-bottom: 0;
    padding: 10px 16px;
    background: #fee2e2;
    color: #dc2626;
    border: 1px solid #fecaca;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.remove-set:hover {
    background: #fecaca;
    border-color: #fca5a5;
}

/* ==================== Clickable Rows & Tiles ==================== */

.clickable-row {
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.clickable-row:hover {
    background-color: rgba(102, 126, 234, 0.08) !important;
}

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

.student-tile {
    background: var(--bg-primary);
    border: 1px solid rgba(0, 0, 0, 0.08);
    border-radius: var(--border-radius-lg);
    padding: 24px 20px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.student-tile:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.student-tile i {
    font-size: 2.5rem;
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
    padding: 16px;
    border-radius: 50%;
}

.student-tile h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
}

/* Custom Dropdown Filters */
.custom-dropdown {
    position: relative;
    width: 100%;
}

.dropdown-toggle {
    width: 100%;
    padding: 10px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.dropdown-toggle:hover {
    border-color: var(--primary-color);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    overflow: hidden;
}

.dropdown-actions {
    display: flex;
    padding: 8px;
    gap: 4px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.dropdown-actions button {
    flex: 1;
    padding: 6px;
    font-size: 0.8rem;
    border-radius: 4px;
    border: 1px solid transparent;
    background: transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    color: var(--text-secondary);
}

.dropdown-actions button.active {
    background: var(--primary-color);
    color: white;
}

.dropdown-actions button:hover:not(.active) {
    background: var(--border-color);
}

.dropdown-list {
    max-height: 250px;
    overflow-y: auto;
    padding: 8px 0;
}

/* Increased specificity to override .form-group label styles */
.dropdown-list .checkbox-item,
.form-group .dropdown-list .checkbox-item {
    display: flex;
    flex-direction: row;
    align-items: center;
    padding: 6px 12px;
    margin-bottom: 0;
    font-weight: normal;
    cursor: pointer;
    transition: background 0.15s ease;
}

.dropdown-list .checkbox-item:hover,
.form-group .dropdown-list .checkbox-item:hover {
    background: var(--bg-secondary);
}

/* Override .form-group input styles */
.dropdown-list .checkbox-item input[type="checkbox"],
.form-group .dropdown-list .checkbox-item input[type="checkbox"] {
    margin-right: 10px;
    margin-bottom: 0;
    width: auto;
    padding: 0;
    cursor: pointer;
}

.checkbox-item span {
    font-size: 0.9rem;
    color: var(--text-primary);
    user-select: none;
}

/* Tags Input */
.tags-input-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background-color: var(--bg-primary);
    padding: 6px;
    min-height: 42px;
    position: relative;
    cursor: text;
}

.tags-input-container:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.tag-pill {
    display: inline-flex;
    align-items: center;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.85rem;
    padding: 4px 8px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.tag-pill-remove {
    margin-left: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.tag-pill-remove:hover {
    color: var(--danger-color);
}

.tags-input-container input {
    border: none !important;
    background: transparent;
    outline: none;
    flex: 1;
    min-width: 120px;
    font-size: 0.95rem;
    color: var(--text-primary);
    padding: 4px;
    margin: 0;
    box-shadow: none !important;
}

.tags-input-container input:focus {
    border: none !important;
    box-shadow: none !important;
}

.tags-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-height: 200px;
    overflow-y: auto;
    margin-top: 4px;
    display: none;
}

.tags-dropdown-item {
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: background 0.2s;
}

.tags-dropdown-item:hover,
.tags-dropdown-item.active {
    background: var(--bg-secondary);
}

.tags-dropdown-add {
    color: var(--primary-color);
    font-weight: 500;
}

/* Action Buttons */
.action-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 6px;
    margin: 0 2px;
    border-radius: 4px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

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

.action-btn.edit:hover {
    color: var(--primary-color);
}

.action-btn.delete:hover {
    color: var(--danger-color);
}

/* Read-only profile field */
.profile-readonly-field {
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.95rem;
    min-height: 42px;
    display: flex;
    align-items: center;
    font-style: italic;
    color: var(--text-secondary);
}

/* ==================== Schedule / Calendar Styles ==================== */

.schedule-panel {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    margin-bottom: 24px;
}

.schedule-sub-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.schedule-sub-tab {
    background: none;
    border: none;
    padding: 10px 18px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    transition: all 0.2s;
}

.schedule-sub-tab.active {
    color: var(--primary-color, #6366f1);
    border-bottom-color: var(--primary-color, #6366f1);
}

.cal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 8px;
}

.cal-header h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.cal-nav-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    padding: 6px 14px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: all 0.2s;
}

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

.cal-grid-wrapper { overflow-x: auto; }

.cal-grid {
    display: grid;
    grid-template-columns: 56px repeat(7, 1fr);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    min-width: 600px;
    background: var(--bg-secondary);
}

.cal-time-col-header {
    background: var(--bg-tertiary);
    border-right: 1px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
}

.cal-day-header {
    background: var(--bg-tertiary);
    border-right: 1px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
    padding: 8px 4px;
    text-align: center;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.cal-day-header.today { color: var(--primary-color, #6366f1); background: rgba(99,102,241,0.07); }

.cal-day-header .cal-day-num {
    display: block;
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.3;
}

.cal-day-header.today .cal-day-num { color: var(--primary-color, #6366f1); }

.cal-time-label {
    background: var(--bg-tertiary);
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    padding: 4px 6px;
    font-size: 0.68rem;
    color: var(--text-secondary);
    text-align: right;
    white-space: nowrap;
}

.cal-cell {
    border-right: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    min-height: 28px;
    position: relative;
    background: var(--bg-primary);
    transition: background 0.15s;
}

.cal-cell-half {
    border-bottom: 1px dashed #cbd5e1; /* Lighter dashed line for half hours */
}

.cal-label-half {
    border-bottom: 1px dashed #cbd5e1;
}

.cal-cell.avail-slot        { background: rgba(34,197,94,0.18); cursor: pointer; }
.cal-cell.avail-slot:hover  { background: rgba(34,197,94,0.32); }
.cal-cell.avail-clickable   { cursor: pointer; }
.cal-cell.avail-clickable:hover { background: rgba(34,197,94,0.1); }
.cal-cell.booked-slot       { background: rgba(148,163,184,0.25); cursor: not-allowed; }
.cal-cell.bookable-slot     { background: rgba(34,197,94,0.18); cursor: pointer; }
.cal-cell.bookable-slot:hover { background: rgba(34,197,94,0.32); }

.cal-event-block {
    position: absolute;
    left: 2px; right: 2px; top: 2px;
    border-radius: 5px;
    padding: 3px 6px;
    font-size: 0.72rem;
    font-weight: 600;
    cursor: pointer;
    overflow: hidden;
    z-index: 2;
    white-space: nowrap;
    text-overflow: ellipsis;
    transition: opacity 0.15s;
}
.cal-event-block:hover { opacity: 0.85; }
.cal-ev-title { display: block; font-weight: 700; font-size: 0.78rem; line-height: 1.3; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cal-ev-sub   { display: block; font-size: 0.70rem; opacity: 0.82; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 1px; }
.cal-event-approved { background: rgba(34,197,94,0.75);  color: #064e3b; border-left: 3px solid #16a34a; }
.cal-event-pending  { background: rgba(251,191,36,0.75); color: #78350f; border-left: 3px solid #d97706; }
.cal-event-rejected { background: rgba(239,68,68,0.65);  color: #7f1d1d; border-left: 3px solid #dc2626; }

.event-status-badge { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; }
.badge-approved { background: rgba(34,197,94,0.18); color: #16a34a; }
.badge-pending  { background: rgba(251,191,36,0.22); color: #d97706; }
.badge-rejected { background: rgba(239,68,68,0.18); color: #dc2626; }

.event-form-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 20px 24px;
    margin-top: 16px;
}

.event-form-panel h4 {
    margin: 0 0 16px 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.event-notes-section {
    padding: 12px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    margin-bottom: 8px;
}

.event-notes-section label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 4px;
}

.event-notes-readonly {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
    min-height: 28px;
}

.avail-manager { margin-bottom: 24px; }

.avail-manager-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    flex-wrap: wrap;
    gap: 8px;
}

.avail-manager-header h4 { margin: 0; font-size: 1rem; font-weight: 700; color: var(--text-primary); }

.avail-legend { display: flex; gap: 16px; font-size: 0.8rem; color: var(--text-secondary); align-items: center; flex-wrap: wrap; }
.avail-legend span { display: flex; align-items: center; gap: 5px; }
.legend-dot { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.legend-dot.green  { background: rgba(34,197,94,0.5);  border: 1px solid #16a34a; }
.legend-dot.yellow { background: rgba(251,191,36,0.6); border: 1px solid #d97706; }
.legend-dot.red    { background: rgba(239,68,68,0.5);  border: 1px solid #dc2626; }
.legend-dot.grey   { background: rgba(148,163,184,0.4); border: 1px solid #94a3b8; }

.coach-picker-row { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }
.coach-picker-row label { font-weight: 600; font-size: 0.95rem; color: var(--text-primary); white-space: nowrap; }
.coach-picker-row select { padding: 8px 12px; border: 1px solid var(--border-color); border-radius: var(--border-radius-md); background: var(--bg-secondary); color: var(--text-primary); font-size: 0.95rem; cursor: pointer; }